TENDERTECHNICALSPECIFICATION
FOR SUPPLY, INSTALLATION,
ERECTION, COMMISSIONING AND
TESTING OF COMPACT SUB STATION
(CSS) AT KAPODRA AND PIPLOD SUB
DIVISION OFFICE ON TURNKEY BASIS
INCLUDING CIVIL WORK, INSTALLATION
OF MSP (MINI SECTION PILLAR) AND LT
UNDERGROUND NETWORK
PART - II
TECHNICAL SPECIFICATIONS:
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INDEX
1.0
Supply, Erection (installation & including
civil work), Commissioning and Testing of
Compact Sub-Station (CSS).
1.1
22KV RMU SPECIFICATIONS
1.2
22KV 500/750/1000 KVA OIL COOLED
TRANSFORMER SPECIFICATIONS.
1.3
LT PANEL SPECIFICATIONS
2.0
Mini Section Pillar (MSP) Specifications
3.0
LT Cable Specifications
4.0
List of Approved Makes of Equipments and
Accessories for Proposed Turnkey Project
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GENERAL INFORMATION (TECHNICAL):
1.1.
CODES, STANDARDS & REGULATIONS
The design, manufacture, erection, cable laying and testing of the equipments and material
to be supplied shall comply with latest revisions of relevant Indian Standards or equivalent IEC
standards. In addition, the Indian Electricity Rules, Electricity Act 2003,Statutory
requirements of Central Govt., GERC and State Government of Gujarat( applicable
codes), shall also be complied with. Any complications arising out of it will be set right
by the bidder without any implication to DGVCL. The bidder shall submit his offer as per
information given in submission of tender.
Drawings, Data and Documents
The bidder shall furnish following documents/information along with offer in spiral bound
volumes. General description of equipment offered specifying the important features, make,
technical parameters, materials of construction etc. To enable DGVCL to have proper
understanding of the material offered and its operation.
The drawings and documents shall be furnished to DGVCL by the successful bidder for approval
of DGVCL, within the period stipulated in the draft contract/mutually agreed terms at
the time of placement of order, the bidder shall submit a list of all such drawings and
documents he proposes to submit. The list will be approved by DGVCL and may be
modified, if necessary. Each drawing /document in the list shall be identified with a
serial number, description and scheduled date of submission. This should be submitted in a
spiral bound volumes.
1.2. FOR REFERENCE
• OEM’s Complete and comprehensive i n s t r u c t i o n
manuals with
operation and maintenance of the equipments supplied by the bidder.
• Preventive maintenance schedule for each equipment.
• Procedure for shutdown and HT equipment.
• Safety procedures for safe operation of equipment and complete system.
• Test procedure for site tests.
drawings
for
1.3. AS- BUILT DRAWINGS
On completion of installation, testing and commissioning, the bidder shall in Corporate
visions/ modification if any, in the reproducible and submit ‘as built’ drawing for DGVCL’s
record in spiral bound volumes and soft copy. The drawings shall be in AutoCAD DXF format.
1.4. TEST AND INSPECTION FOR INDIVIDUAL ITEM
Routine test/ Acceptance tests shall be carried out on all equipment at manufacture’s works/
ERDA as per appropriate IS/IEC. The bidder shall make reasonable facilities, at his cost for
inspection and testing of the equipment/material by DGVCL’s Officials. No equipment/item
shall be dispatched to site without provisional certificates of acceptance issued by DGVCL.
Inspection and test shall be carried out at the place of manufacture as well as on receipt of
the equipment at site if required. Inspection and tests do not relieve the bidder of his
contractual obligations regarding performance of the equipment at site/in actual use.
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The bidder shall submit the brief summary of all type test certificates for similar equipment
supplied by him elsewhere and the actual type test certificates as and when asked. In case type
test certificates for similar equipment is not available, the same shall be conducted in
the presence of DGVCL’s Authorized representative if DGVCL so desires, without any financial
implications to the DGVCL. The type test report shall not be older than 5 year from the date
of tender opening (Technical bid opening). The supplier of the equipment shall ensure that
the equipment available at his works for routine test/type test/acceptance test are duly
calibrated and necessary certificate shall be made available to the inspecting officer of
DGVCL.
As far as possible, the supplier of equipment shall give a minimum of 15 days notice of readiness
of material and give the inspection call accordingly. If on arrival of inspecting officer at the
works, the material is not found to be ready, the concerned supplier of equipment shall be
liable for additional expenditure DGVCL may incur on account of retention or re-deputation of
the inspecting officer.
The officer deputed for inspecting for particular lot of material according to intimation
from you may also like to check Quality Control Plan and for that purpose he may demand the
Test Reports of raw material being procured.
1.5. FUNCTIONAL AND COMPOSITE TESTING
Following test shall be conducted on equipment after completion of erection in the
presence of Engineer-in-charge from point of view of completeness in the presence of DGVCL’s
Authorized Representative.
•
•
•
•
•
•
•
•
•
•
Visual inspection of total system.
Checking of continuity of power and LT/HT cables.
Checking of nameplate data of complete system.
Verification and measurement of earthing resistance.
Checking of cable terminations and laying, dressing etc. in the equipment kiosk.
Checking of safe accessibility of components.
All the equipments and materials shall be passed through checks and test as per
approved Field Quality Plan.
The insulation resistance test shall be carried out
HV installation above 11 KV- by 2500V Megger
Power circuit of voltage up to 1KV- by 1000 V Megger
1.6. BAR CHARTS
The Bidder shall furnish along with the bid, the bar charts in Project and project schedules
indicating starting and completion dates of each activity, such as preparation & approval of
drawings, manufacturing/supply/ delivery, civil works, Cable laying erection, testing, pre
commissioning and commissioning etc. so that quarter wise completion activities suffice the
purpose for releasing the connections.
1.7 GENERAL
Identification labels shall be provided on all equipments as per client’s approval. All labels
shall be engraved on plastic (white letters with black background) and all text shall be in
English language.
Any exclusion /deviation from specification shall be clearly spelt out and listed at one place
only and bidder shall substantiate the same with appropriate reasons. In the absence of clearly
spelt out and mutually agreed deviation, it shall be considered that the bidder has undertaken
to comply with the technical specification totally, in letter and spirit.
It will be responsibility of the successful bidder to obtain necessary approval of statutory
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authority as per rules of Govt. of Gujarat before energizing/ charging the equipment/system.
However bidder shall be extended all assistance by the DGVCL in regard to application for the
same. For installation work at site, the bidder shall be fully responsible for arranging the
supply of required tools and tackles, welding sets, cable crimping tools, labours, scaffolding,
ladders, etc.
The power connection will be provided by DGVCL at one point only at the prevailing tariff,
from where the bidder has to arrange for temporary connection and further distribution of
supply at his own cost. The installation of energy meter, cut out, switches etc. for construction
power shall be as per prevailing norms of DGVCL. The test report and other requirement to
release the connection shall be as per prevailing rules of DGVCL.
On completion of the installation but before energizing the system, all installation shall be
physically checked and properly tested. These checks and tests shall be conducted by the
bidder under the supervision of Engineer In-charge and bidder shall furnish the final status
and test results shall be made good by the bidder free of cost within contract completion
period.
All clamps, brackets, bolts, nuts, screws, markers, ferrules, lugs and glands and other
hardware necessary for erection work, shall include in the scope of work and shall be arranged
by the bidder.
1.8 APPROVED MAKES OF EQUIPMENTS /ITEMS OF SUPPLY.
List of approved makes of equipments and accessories for proposed project as per last
page
Notes
(i)The DGVCL reserves the right to make changes (add or delete names of other makes) in
the list during execution of contract.
(ii) If bidder wants to propose additional vendors for any of the items, same shall be stated
along with the tender or within 30 days from the date of LOI & decision thereof will be
conveyed within 30 days thereafter by DGVCL.
2.0 INSPECTION AND TESTING OF EQUIPMENT
Manufacturing Progress reviews, inspection & testing of equipment covered under the technical
specification shall be carried out by the DGVCL’s Authorized Representative at the
manufacturer’s works/premises prior to dispatch, to ensure that their quality & workmanship
are in conformity with the contract specifications and approved drawings.
3.0 RESPONSIBILITY FOR INSPECTION
Any inspection by the DGVCL’s Authorized Representative does not relieve the Bidder from his
responsibility of quality assurance and quality control functions.
As such, any approval which the Inspecting Engineer of the DGVCL may have given in respect of
equipment and other particulars and the work or workmanship involved in the contract (whether
with or without test carried out) shall not bind the DGVCL to accept the plant & equipment,
should it on further tests at site be found not comply, with the requirements of the
contract. If required, audit wing of DGVCL Inspection Department shall also be entrusted
with inspection of particular item/equipment received at site. The bidder is to meet the
inspection & testing requirements
for the equipment coming under the statutory
regulations e.g. weights & measures, safety, IE rules, etc. and submit calibration certificates
and documents from appropriate authority to the DGVCL Inspecting Engineer for the
same, on demand.
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4.0. METHOD OF GIVING INSPECTION CALLS
Inspection calls shall be given by the Bidder to Chief Engineer DGVCL, Surat in accordance with
mutually agreed program with 15 days’ clear time for all equipments. Four sets of relevant
test certificates and inspection report of the Bidder/ Sub-bidder after satisfactory completion
of internal inspection and test shall be submitted along with acceptance/routine test certificate
of the tests witnessed by DGVCL Inspector.
The DGVCL reserves the right to visit at any stage of manufacture at plant and ask for
additional inspection & tests if it is found necessary after completion of detailed design
& engineering and approval of drawings. The DGVCL or his duly authorized representative
shall on giving written instructions to the bidder, setting out any grounds of objection
which he may have in respect of the work, be at liberty to reject all or any part of
plant/equipment or workmanship which are not in conformity with the contract provisions.
5.0 BIDDER’S RESPONSIBILITY
The Bidder shall provide all reasonable facilities to the Inspecting Engineer of the DGVCL to
the Bidder’s or their sub-bidder’s premises at any time during contract period, to facilitate him
to carryout inspection & testing of equipment during manufacture of equipment.
The Bidder shall delegate a representative/coordinator to deal with DGVCL on all inspection
matters.
The Bidder shall comply with instructions of the DGVCL’s Inspecting Engineer fully. The Bidder
shall ensure that the equipment and materials once rejected by the Inspecting Engineer are
not reused in the manufacturing of the equipment and materials. Where parts rejected by
the Inspecting Engineer have been rectified as per agreed procedures laid down in advance,
such parts shall be segregated for separate inspection and approval, before being used in the
work.
6.0. INSPECTION WAIVER
For certain standard bought-out items and the products of reputed firms where the DGVCL has
earlier experience on the quality of their products, the DGVCL may consider allowing of
inspection waiver for such items. The Chief Engineer DGVCL, Surat shall issue approval of
inspection waiver certificate after scrutiny of bidder’s internal inspection report, test
certificates and other documents. However, it is not binding upon DGVCL to give waiver on
bidder’s request. DGVCL may weigh the important issues like quantity of material, cost of
material, importance of material, distance of travel & time of travel required to inspect
before deciding the waiver of the inspection.
7.0. AUDIT INSPECTION
From the lots inspected by the DGVCL, the Inspector of DGVCL may pick up samples from the
lots supplied at stores of contractor at random for quality check only.
The samples picked up will be tested for acceptance test / type test or as decided by DGVCL at
Government/ NABL approved laboratory or ERDA laboratory at DGVCL RSO, in presence of
representatives of contractor and DGVCL as per relevant ISS/BIS/ DGVCL specifications. The
test results will be binding on the suppliers and DGVCL, in general will not allow resampling. If the material fails in any of the acceptance tests carried out, the full lot of
materials will be considered as rejected, and if replacement is not possible due to
consumption of the materials then in that case for whole of the rejected lot, DGVCL will
deduct maximum up to 30% (Thirty) of the contractual order cost of that item. If the same are
not utilized / consumed, then DGVCL may ask for replacement at sole discretion of DGVCL or
may accept with maximum deduction up to 30% (Thirty) of the contractual order cost of
that item, and all these will be binding on the contractor.
In case if the materials does not confirm to specifications or fails at Government approved
laboratory or other laboratory decided by DGVCL for testing and if subsequent testing are
to be carried out (which will solely at DGVCL discretion), then all Testing fees, expenses of the
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inspector and other expenses incurred by DGVCL will be to contractor’s account. The
decision in this regard for acceptance as above of DGVCL shall be final and this will be binding
on the contractor.
8.0 OTHER CONDITIONS
Any clarification / amendment necessary, in any or more clauses incorporated in the present
A/T, you will have to make a detailed reference to the DGVCL latest within ten days from
the receipt of A/T. If you fail to do so, no request for any clarification / amendment shall be
considered thereafter. Please also note that all the points which need clarification/
amendment should be brought out at once. No piecemeal clarification/amendment will be
entertained.
9.0 PRE BID INSPECTION AND VERIFICATION OF SITE BY BIDDERS
Bidder, if desire, may visit and inspect proposed work site of Kapodra-Piplod before bidding.
Prospecting bidder may contact our Deputy Engineer (O&M) Kapodra sub division (09879201146)
and Deputy Engineer (O&M) Piplod sub division (09879201171) with prior appointment and
confirmation.
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1.0
SUPPLY, ERECTION (INSTALLATION &
INCLUDING CIVIL WORK),
COMMISSIONING AND TESTING OF
COMPACT SUB-STATION (CSS).
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1.0 GENERAL SITE REQUIREMENT
When installing a PSS local building regulation have to be followed. The instructions and
proposals stated in this instruction have to be adjusted as per building regulations. In order
to avoid problems with final alignment of the doors, it is important that the foundation is
prepared properly. The local soil conditions and possibility of the ground settlement should
also be considered. The foundation has to be made sufficiently deep so that sinking of the
base due to frost, rain (humidity) or drought is avoided, thus making final alignment easier.
Depending on the site topography, design the support required for the foundation (gravel,
concrete plinth or plinth and pile foundation). For locating the substation on difficult
terrains, the substation should be mounted on a concrete base (accessory or site cast), and
in extreme conditions the base should be set on pile foundation.
Following checks are to be carried out on the site cast concrete foundation.
• Location of cable trenches (HV & LV)
• Location and size of foundation bolts provided
• Earthing bar location
• Adequate earthing
• DO’s & DON’T’s Charts, Operational manual & SLD (Soft copy as well as hard copy)
• Danger Plates
• DGVCL Logo (600 mm x 300 mm)
• Covers & Doors: Covers & doors are part of the enclosure. When they are closed,
they shall provide the degree of protection specified for the enclosure. Ventilation
openings shall be so arranged or shielded that same degree of protection as specified
for enclosure is obtained. Additional wire mesh may be used with proper Danger
board for safety of the operator. All covers, doors or roof shall be provided with
locking facility or it shall not be possible to open or remove them before doors used
for normal operation have been opened. The doors shall open outward at an angle of
at least 90 & be equipped with a device able to maintain them in an open position.
• 3 compartment shall separate the different components i.e. RMU, Transformer, Fuse
board Panel for safe operation. Base-Channel with proper locking arrangement
shall be provided at the base of RMU, Transformer & LV Fuse board Panel to lock the
position & to move /draw-out equipments for easy replacement / maintenance.
2.0 HT SWITCHGEAR CONNECTION
To carry out the connection between incoming cables and HT switchgear:
• Roll in the cables through preformed trench and connect it to the HT switchgear
terminals with suitable cables terminations and proper glanding at the bottom plate.
• Protective screen of the cables is to be earth to HT switchgear and earthing.
3.0 LT switchgear connection
To carry out the connection between incoming cables and LT switchgear:
• Roll in the cables through preformed trench and connect it to the LT switchgear
terminals with suitable cables lugs and proper glanding at the bottom plate.
• Protective screen of the cables is to be earth to LT switchgear and earthing.
4.0 Earthing (Strictly as per IS)
The earthing conductor from earthing plates are to be connected to HT switchgear body, LT
switchgear body, Transformer body and transformer Neutral respectively in line with
earthing connection diagram. Galvanised iron earthing conductors of size 50X6 mm are
provided. Inter connection between HT switchgear and transformer uses single core cable.
The cable screen is to be earthed only on the HT switchgear side.
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1.1: 22KV Ring Main Unit (RMU).
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SPECIALINSTRUCTIONSTOBIDDER
Please read following instructions carefully before submitting your bid.
1.
All the drawings, i.e. elevation, side view, plan, cross sectional view etc., in
AutoCAD format and manuals in PDF format, for all items including installation (civil
work) shall be submitted. Also the hard copies as per specification shall be
submitted.
2.
The bidder/EPC contractor shall submit Quality Assurance Plan for manufacturing process
and Field Quality Plan with the technical bid.
3.
The bidder/EPC contractor shall have to submit all the required type test reports f o r
the offered item. However, in the event of partial submission or reports older
than specified limit, bidder must submit his confirmation for those type test
report/s to be submitted in the event of an order, without affecting
delivery schedule, before commencement of supply, free of cost. In
of t h i s c o n f i r m a t i o n ,
the evaluation shall be carried out
absence
accordingly as non submission of type test reports.
4.
The bidder/EPC contractor must fill up all the point of GTP for offered item/s. Instead
of indicating “refer drawing, or as per IS/IEC”, the exact value/s must be filled in.
5.
All the points other than GTP, which are asked to confirm in technical specifications
must be submitted separately with the bid.
6.
The bidder is required to impart training in view of manufacture, assembly,
erection, operation and maintenance for offered item, at his works, to the
person/s identified by DGVCL, in the event of an order, free of cost. The cost of
logistics will be bear by DGVCL.
7.
Please note that the evaluation will be carried out on the strength of content of
bid only. No further correspondence will be made.
8.
The bidder shall bring out all the technical deviation/s only at the specified
annexure.
9.
The bidder
should
indicate
manufacturing
capacity
by s u b m i t t i n g
latest
updated certificate of a Chartered Engineer (CE).
10.
Vendor Registration for item Compact Sub Station is not mandatory for subject
tender.
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QUALIFYINGREQUIREMENTDATA
(For Supply, if any)
Bidder/EPC contractor to satisfy all the following requirements.
1)
The principal manufacturer/s of bidder shall be Original
E q u i p m e n t Manufacturer
(OEM). The
offered
equipment
have to be designed, manufactured and tested as per relevant
IS/IEC with latest amendments.
2)
The minimum requirement of manufacturing c a p a c i t y of OEM for
offered type, size and rating of equipment shall be 7 times tender /
bid quantity. The bidder should indicate manufacturing capacity by
submitting latest updated certificate of a Chartered Engineer (CE).
3)
Equipment proposed sha ll be of similar or higher rating and in
service for a minimum period of Five (5) years and satisfactory
performance certificate in respect of this is to be available and
submitted.
4)
The bidder should clearly indicate the qu an ti ty an d Single Value
Contract executed during last FIVE (5) years, for the offered
equipment. Bidder should have executed o n e si ng l e contract
d u r i n g last five years for the q u a n t i t y equivalent to tender/bid.
The details are to be submitted in following format,
Sr.
No
ITEMS
SUPPLIED
TO
ORDER
REFERENCE No. ITEMS
& DATE
QUANTITY
ORDER
FULLY
EXECUTED.
YES/NO
STATUS, IF
ORDER
UNDER
EXECUTION
REMARK
5) Equipment offered shall have Type Test Certificates from Govt
approved/accredited laboratory (accredited based on ISO/IEC Guide
25 / 17025 or EN 45001 by the National accreditation body of the
country where laboratory is located), as per IEC / IS / technical
specification. All the r e q u i r e d t y p e tests should not be older than 5
(five) years from the date of opening of technical bid.
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PART A&B: TECHNICAL SPECIFICATION FOR OUTDOOR 22
KV RING MAIN UNIT SWITCHGEAR (SF6 GAS INSULATED
VCB)
1.1 GENERAL:
1.1.1 All equipment and material shall be designed manufactured and tested in
accordance with the latest applicable IEC standard.
1.1.2 Equipment and material conforming to any other standard, which ensures equal
or better quality, may be accepted. In such case copies of English version of the
standard adopted shall be submitted.
1.1.3
The electrical installation shall meet the requirement of Indian
Electricity
Rules-1956 as amended up to date; relevant IS code of practice and Indian Electricity
Act-1910. In addition other rules and regulations applicable to the work shall be
followed. In case any discrepancy, the most stringent and restrictive one shall be
binding.
1.1.4 The high-tension switchgear offered shall in general comply with the latest
issues including amendments of the following standards but not restricted to them.
1.2 SCOPE:
Design, Engineering, Manufacture, assembly, Stage testing, inspection and testing
before supply and delivery at site, Erection, Installation, testing & Commissioning of
Ring Main units outdoor type SF6 insulated VCB, with various combinations of load
break isolators & breakers. The scope includes Supply, Erection, testing and
commissioning of outdoor type RMU with necessary take off terminal units for
future automations contains load break isolators, breaker and associated
accessories, equipments. (including civil works and earthing- Erection of earthing
by using GI strip (minimum 35 mm strip) with earthing plate including cost of
coal/salt to RMU). The Installation of 22KV Outdoor SF6 Insulated RMU covering
erection, testing and commissioning with associated equipment including civil work of
RMU, drawing and BOM (Bill of Material) of civil work submit by bidder along with
technical details.
The RMUs should be provided with necessary take off terminal units for future
automations and all these units should be shielded in a outdoor metal-body for making
them suitable for outdoor use. The insulation/dielectric media inside the stainless steel
welded tank should be SF6 gas. The RMUS should be Modular, extensible type on
both sides with provision of attaching/connecting with SNAP FIT arrangement W/o
External Busbars additional load break switches and circuit breakers in future
whenever required. Alternatively Extension shall be possible by adding trunking
chambers and required accessories or by plug-in bushing type arrangement. The Package
scope of work shall include survey, design, manufacture, FAT a n d delivery, installation
and commissioning of new SCADA enabling equipments of new “SCADA-Ready” The RMU
should have compatibility with OPEN PROTOCOL SCADA system. Ring Main Units capable
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of being monitored and controlled by the SCADA/DMS. The RMU should have the castle
lock for avoiding dual supply and safety purpose. Where relevant, the RMU scope of
work shall be coordinated with the work to be carried out under the project’s other
construction packages & associated materials to the designated destinations as per this
tender specification and Bill of quantities. Includes supply of relevant 22KV cable
termination kits per this tender Specification. Each RMU shall include its own power
supply unit (including auxiliary power transformer, batteries, and battery charger),
which shall provide a stable power source for the RMU. The RMUs will be connected to
the FRTU which will be procured, supplied and installed as a part of Part A of R-APDRP.
The RMU will also supply 230VAC 500VA for FRTU. Refer Annexure-1. FRTU, MODEM,
Power and I/O cable interface between FRTU and Control panel of RMU/sectionaliser
are excluded in the scope of supply and these items will be provided by DGVCL/SIA.
Each new RMU shall be equipped with main-line load break switches and a fault passage
indicator (FPI). Furthermore, to protect each of its lateral / transformer feeders, it
shall be equipped with a corresponding set of circuit breakers and self-powered
numerical relays. The RMU shall include potential-free contacts and control contacts so
as to connect to SCADA/DMS via FRTUs, so as to:
Monitor and control the open/closed status of the RMU circuit breakers and load
break switches.
Monitor the local/remote position of RMU motorised (in case if failure of motor)
manually-operated switches that can be used to enable and disable remote
monitoring.
Monitor the health of the power supply, which will include battery failure and low
voltage indications.
Monitor the open/closed status of RMU earthing switches.
Monitor the open/closed status of RMU enclosure doors in case of Hinge doors.
Monitor for low SF6 gas pressure indication.
Monitor for circuit breaker relay operations.
Monitor for indication of main-circuit fault detected by the RMU’s FPI.
1.2.1 Configurations Required:22 KV RMU (Non extensible refer 1.17 for more details)
3-way (RRL), 22KV, Gas (SF6) Insulated RMU with 2Nos 630A load break switch and 1No.
SF6 insulated VCB of suitable rating –
Sr.
No.
1
Item Description (Non
extensible)
22KV RMU RRL
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Note: R stands for isolators
L stands for Circuit breaker
PLEASE
NOTE:
THE NOMINAL CURRENT RATING OF VCB SHALL BE
ACCORDING TO LOAD OF THE FEEDER AND ACCORDINGLY SUITABLE RELAY SHALL
BE PROVIDED AND ANY CHANGE IN COMBINATION/CONFIGURATION
SHALL BE
EXECUTED WITH THE APPROVAL OF CHIEF ENGINEER OF RESPECTIVE DGVCL.
1.1 This Specification provides for design, manufacture, inspection and testing
before dispatch, packing and delivery F.O.R.(Destination) of SF6 insulated RMUs with
necessary take off terminal units for future automations, compatible with SCADA
system other accessories and auxiliaries equipment and mandatory spares, described
herein and required for their satisfactory operation.
1.2. The objective of the RMUs is for extremely small construction width, compact,
maintenance free, independent of climate, easy installation, operational reliability,
Safe and easy to operate, minimum construction cost, minimum site work and
minimum space requirement.
1.3. The RMUs shall conform in all respects to high standards of Engineering design,
workmanship and latest revisions of relevant standards at the time of offer.
RMU to be installed on Plinth Erection of plinth with cost of cement etc as per
below requirement Plinth size minimum 5’x4’x2’ or as per required Cement ratio 1:
2 : 4 ;Weight of RMU 510 kg to 1000 kg.
1.4. The type of the 22 KV circuit breaker shall be VCB and insulating medium for load
break isolators, Earth switch, 22 KV Buses and other associated equipments should be
SF6 gas. Necessary current sensors / transformers for protection and metering (wherever
required). All necessary dry (potential-free) contacts for indications relevant to RMU
monitoring status and control. A PT Panel including auxiliary power transformer for
measurement of system voltage and for charging the batteries. Battery and battery
charger, to provide stable as per motor rating, 24 VDC, power for the RMU’s motors.
Capacitor voltage dividers serving live-line cable indicators.
1.3 GENERAL:
The Ring Main Unit shall be installed at 22 KV junction points to have continuous
supply by isolating faulty sections. The RMU shall be extensible on both sides and
consists of the following combinations of load break switches and Circuit breakers for
a nominal voltage of 24 KV using SF6 gas as insulating and Vacuum as arc quenching
medium.
The RMU and combination shall be tropicalised and outdoor metal enclosed type. The
RMU metal parts shall be of high thickness, high tensile steel which must be
grit/short blasted, thermally sprayed with Zinc alloy, phosphate or should follow the 7
tank pre-treatment process and be subsequently painted with polyurethane based
powder paint. The overall paint layer thickness shall be not less than 80 microns.
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Relevant IE rules for clearances, safety and operation inside the enclosure shall be
applicable. The enclosure shall be IP 54 and type tested for weather proof at
EREDA/CPRI.
All live parts except for the cable connections in the cable compartments shall be
insulated with SF6 gas. The SF6 gas tank shall be made of robotic or TIG or MIG or Laser
or manually welded stainless steel, to have the best weld quality. The gas cubicle shall
be metal enclosed with stainless Steel of thickness as per IEC tested/ designed so as
to provide safety and to avoid leakage of gas and should be provided with a pressure
relief arrangement away from operator.
Both the load break switches and the tee off circuit breaker must be motorized.
The cable box of isolators and circuit breakers both should be of front access type as per
site requirement.
Any accidental over pressure inside the sealed chamber shall be limited by the opening
of a pressure-limiting device in the top or rear-bottom part of the tank or enclosure.
Gas will be release to the rear of the switchboard away from the operator and should
be directed towards the bottom, into the trench to ensure safety of the operating
personnel and the pedestrians / civilians. All the manual operations should be carried
out on the front of the switchboard.
2.2 GENERAL TECHNICAL REQUIREMENTS
2.2.1 Fixed type SF-6 gas insulated / Vacuum circuit breakers. It should be
maintenance free, having stainless steel robotically/ TIG / MIG /Laser/ Manually
welded enclosure for IN DOOR / OUTDOOR RMU. However, offer with high quality of
the welding which has necessary extensive leakage test with leak rate of 0.1% per
annum can be accepted. The RMUs to be used are only outdoor type.
2.2.2 Low gas pressure devices- 1.2 Bar pressure. RMU should have full rating with 0.0
Bar gas pressure.
2.2.3 Live cable indicators- High operator safety.
2.2.4 Fully rated integral ear thing switch on each device.
2.2.5 Self p o w e r e d Microprocessor Based relay- Does not require any external source
of power.
2.2.6 Units fully SCADA Compatible. Retrofitting at site possible at a later date. Line
switches (Load break switches) as well as T- OFF circuit Breaker can be operated by
remote. (Manual operations should be possible in case of motor failure.)
2.2.7 For indoor Cable boxes should be front access and interlocked with earth switch.
No rear /side access required. For outdoor RMUs cable boxes shall be on front.
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2.2.8 Cable testing possible without disconnection of cables.
2.2.9 Compact in dimension.
2.2.10 Circuit Breaker with self powered O/C & E/F RELAY.
2.2.11 Low pressure, sealed for life equipment, can operate at “0” bar pressure.
2.2.12 Cable ear thing switch on all switching device-standard, for operator safety.
2.2.13 Enclosure with IP 54 standard protection for OUTDOOR RMUs and IP2X for INDOOR
RMUs
2.2.14 All live parts should be inside a stainless steel enclosure for outdoor type RMU &
minimum 2 mm thickness of stainless steel robotically/TIG/MIG/Manually
welded
enclosure for Outdoor / indoor RMU. However, more / less thickness than 2 mm of
stainless steel tank as per IEC tested design may be admissible.
TECHNICAL AND GUARANTEED PARTICULARS:
The bidders shall furnish all guaranteed technical particulars as called for in
Schedule “A” of this specification. Particulars which are subject to guarantee shall
be clearly marked. Bids lacking information in G.T.P are liable to be rejected. The
Entire units or minimum three functions of RMU shall be enclosed in a single
compact metal clad, outdoor enclosure suitable for all weather conditions. The
switchgear/steel gas tank shall be filled with SF6 as per IEC/IS Standards relative
pressure to ensure the insulation and breaking functions. The steel gas tank must be
sealed for life and shall meet the “sealed pressure system” criteria in accordance
with the IEC 298 standard. The RMU must be a system for which no handling of gas is
required throughout the 20 years of service life.
The RMU shall have a design such that in the event of an internal arc fault, the operator
shall be safe. This should be in accordance with IEC 298 and relevant Test certificates
shall be submitted with the Tender.
The offered switchgear and control gear should be suitable for continuous
operation under the basic service conditions indicated below. Installation should be
in normal indoor conditions in accordance with IEC 60694.
Ambient temperature - 10 degree C to +45 degree C Relative humidity - up to 95%
Altitude of installation - up to 1000m, IEC 60120
1.3.1 The RMU shall be tested for an internal arc rating of 16 kA for 1 Sec. for 22 KV
RMU. Suitable temperature rise test on the RMU shall be carried out & test reports shall
be submitted with tender for technical bid evaluation.
Each switchboard shall be identified by an appropriately sized label, which clearly
indicates the functional units and their electrical characteristics.
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The switchgear and switchboard shall be designed so that the position of the
different devices is visible to the operator on the front of the switchboard and
operations are visible as well.
The entire system shall be totally encapsulated. There shall be no access to exposed
conductors. In accordance with the standards in effect, the switchboards shall be
designed so as to prevent access to all live parts during operation without the use of
tools.
The entire 22 KV RMU are insulated by inert gas (SF6) suitable for operating voltage up
to 24 KV respectively. The 22
KV circuit breakers must be VCB breaker. It is necessary to fit an absorption
material in the tank to absorb the moisture from the SF6 gas. The SF6 insulating
medium shall be constantly monitored via a temperature compensating gas pressure
indicator offering a indication at different temperature ranges, having distinctive RED
and GREEN zones for safe operation.
All the RMUs must be routine tested for the following at factory in India:Micro-ohm test for the assembly inside the tank.
Circuit breaker analyzer test so as to ensure the simultaneous closing of all poles for
VCB.
SF6 gas leak test.
Partial Discharge test on the complete gas tank so as to be assure of the proper
insulation level and high product life. High voltages withstand.
Secondary test to ensure the proper functioning of the live line indicators, fault passage
indicators and relays.
1.3.2 Sulphur Hex fluoride Gas (SF6 GAS)
The SF6 gas shall comply with IEC 376,376A, and 376B and shall be suitable in all
respects for use in 22 KV RMUs under the operating conditions. The SF6 shall be tested
for purity, dew point air hydrolysable fluorides and water content as per IEC 376,376A
and 376B and test certificate shall be furnished to the owner indicating all the tests as
per IEC 376 for each Lot of SF6 Gas.
DIELECTRIC MEDIUM
SF6/VCB GAS shall be used for the dielectric medium for 22 KV RMUS in accordance with
IEC376. It is preferable to fit an absorption material in the tank to absorb the moisture
from the SF6/VCB gas and to regenerate the SF6/VCB gas following arc interruption.
The SF6/VCB insulating medium shall be constantly monitored via a temperature
compensating gas pressure indicator offering a simple go, no-go indication.
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General structural and mechanical construction:
The offered RMU should be of the fully arc proof metal enclosed, free standing, floor
mounting, flush fronted type, consisting of modules assembled into one or more units.
Each unit is made of a cubicle sealed-for life with SF6 / VCB and contains all high
voltage components sealed off from the environment.
The overall design of the indoor switchgear should be such that front access only is
required. It should be possible to erect the switchboard against a substation wall, with
HV and LV cables being terminated and accessible from the front.
The units should be constructed from Minimum 2 mm thick stainless steel sheets.
However, Offer with type test report of pressure withstand test for gas filled
compartment with pressure relief device test as per cl. no. 6-103-1 of IEC 62271-2002003 can be accepted for 2mm stainless steel tank thickness. The thickness of stainless
steel tank more/less than 2 mm may be admissible with relevant IEC tests. The design
of the units should be such that no permanent or harmful distortion occurs either when
being lifted by eyebolts or when moved into position by rollers.
For outdoor RMUs a weather proofing process shall be carried out. SHEET METAL
MUST BE GRIT BLASED/THERMALLY SPRAYED AND POLYURETHANE PAINTEDWITH
ABOUT 70 MICRON THICKNESSES, TO ACHIVE OUTDOOR WORTHINESS AND CORROSION
PROOF NESS. - RMU ENCLOSURE M U S T BE SHIELDED AGAINST SOLAR IRRADIATION AND
T E S T E D FOR AN AMBIENT OF 45 DEGREE C WITHOUT DERATING OF THE EQUIPMENT.
The cubicle should be having a pressure relief device. In the rare case of an internal
arc, the high pressure caused by the arc will release it, and the hot gases is allowed
to be exhausted out at the bottom / top / rear of the cubicle. A controlled direction
of flow of the hot gas should be achieved. The switchgear should have the minimum
degree of protection (in accordance with IEC 60529)
- IP 67 for the tank with high voltage components
- IP 2X for the front covers of the mechanism
- IP 3X for the cable connection covers
- IP 54 for the outdoor enclosure.
1.4 STANDARDS:
Unless otherwise specified elsewhere in this Specification, the RMU, Switchboard
(Switchgear), Load break isolators, Instrument Transformers and other associated
accessories shall conform to the latest revisions and amendments thereof to the
following standards.
1. IEC 60 298/IEC 62 271-200/IS 12729:1988 - General requirement for Metal Enclosed
Switchgear
2. IEC60129/IEC62271-102/IS 9921 - Alternating current disconnector’s (Load break
isolators) and earthing switch
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3. IEC 62 271-100 & 200/IEC 60 056/IS 13118:1991 - Specification for alternating current
circuit breaker
4. IEC 62 271-1/IEC 60694 - Panel design, SF6/Vacuum Circuit Breakers
5. IEC 60044-1/IEC 60185/IS 2705:1992 - Current Transformer
6. IEC 60265/IS 9920:1981- High voltage switches.
7. IEC 376 - Filling of SF6 gas in RMU.
8. IEC 60273/IS: 2099 - Dimension of Indoor & Outdoor post insulators i. with voltage >
1000 Volts.
9. IEC 60529/IS 13947(Part-1) - Degree of protection provided by i. enclosures for low
voltage switchgear and
ii. Control gear.
10. Indian Electricity Rules/IS Code
Equipment meeting with the requirements of any other authoritative standards, which
ensures equal or better quality than the standard mentioned above shall also be
acceptable. If the equipments, offered by the Bidder conform to other standards,
salient points of difference between the standards adopted and the specific standards
shall be clearly brought out in relevant schedule. In case of any difference between
provisions of these standards and provisions of this specification, the provisions
contained in this specification shall prevail. One copy of such standards with authentic
English Translations shall be furnished along with the offer. (Hard copy)
Applicable Standards
The RMUs shall be manufactured to the highest quality consistent with best practice and
workmanship and in full accord with the Supplier’s quality assurance plan. The RMUs
shall conform to the Indian or IEC international standards that are applicable. These
include the standards listed in Table 1Error! No text of specified style in document.-1
below.
Table 1Error! No text of specified style in document.-2: Applicable Standards
Standard
Description
IS 3427
AC metal enclosed switchgear and control gear for rated voltages above 1
kV and up to and including 52 kV
IS 12063
Classification of degrees of protection provided by enclosures of electrical
equipment
IS 9920
(Parts 1 to 4)
High Voltage Switches
IS 9921
(Parts 1 to 5)
Specification for AC disconnectors and earthing switches for voltages
above 1000 V
IS 13118
IS 10601
HV AC Circuit Breakers
Dimensions of terminals of HV Switchgear and Control gear
IS 12729
General requirements of switchgear and control gear for voltages
exceeding 1000 V
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IEC 1330
IEC 60694
IEC 6081
IS 2705
IS 3156
IS 8686
IEC 62271200
INDIAN
ELECTRCIATY
REGULATION
2011
High voltage/Low voltage prefabricated substations
Common clauses for MV switchgear standards
Monitoring and control
Current Transformers
Voltage transformers
Specification for Static Protective Relays
Standards for high voltage metal clad switchgear up to 52 KV.
This is to be as per Central Electricity Authority (Safety Requirement for
Construction, Operation & Maintenance of Electrical Plants and Electric
Lines) Regulations, 2011
1.5 THE STANDARDS MENTIONED ABOVE ARE AVAILABLE FROM:
IEC - (INTERNATIONAL ELECTRO-TECHNICAL COMMISSION, BUREAU CENTRAL DE LA
COMMISSION, ELECTRO TECHNIQUE INTERNATIONAL, 1, RUE DE VEREMBE, GENEVA,
SWITZERLAND.)
ISO - INTERNATIONAL STANDARD ORGANISATION
1.6 SPECIFIC REQUIREMENTS IN RMU:
1.6.1 CLIMATE CONDITIONS
The climatic conditions under which the equipment should operate satisfactory are as
under:
1
Maximum ambient air temperature
:40-45 deg. C
2
Minimum ambient air temperature
:10 deg.C
3
Maximum daily average ambient air
temperature
:40 C
4
Maximum humidity
:100%
5
Altitude above M.S.L. (maximum)
:1000 metres
6
Average annual rainfall(mm)
:925
7
Max. wind pressure(Kg/sq.m)
:200
8
Seismic level(Horizontal accn.)
:0.3 g
9
Iso-ceraunic level(Days per Year)
:50
10
Average thunder storm days per annum
:50
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Distribution Network Electrical Parameters
The main parameters of the distribution network are as follows:
1
Nominal system voltage:
22 kV (rms)
2
Highest system voltage:
24 kV (rms)
3
Number of phases:
3
4
Frequency:
50 Hz
5
Variation in frequency:
49.5 Hz to 50.5 Hz
6
Type of earthing:
Solid
7
Power frequency withstand voltage:
50 kV
8
Basic impulse withstand voltage :
125 kV
1.7 RMU OUTDOOR METAL CLAD ENCLOSURE.
The RMU enclosure must be a metallic, it shall follows an industrialized process of
manufacturing. The RMU and combination shall be tropicalised and outdoor metal
enclosed type. The RMU metal parts shall be of high thickness, high tensile steel which
must be grit/short blasted, thermally sprayed with Zinc alloy, phosphate or should
follow the 7 tank pre-treatment
process and be subsequently painted with
polyurethane based powder paint. The overall paint layer thickness shall be not less
than 80 microns.
The rating of enclosure shall be suitable for operation on three phase, three wire, 11
KV, 50 cycles, A.C. System with short-time current rating of 16 KA for 3 seconds for 22
KV with RMU Panels.
The enclosure should have two access doors one for the operation and relay
monitoring and other for the cable access. Both the doors should have the locking
facility to prevent the access to operating mechanism to avoid unauthorized
operating of RMU and relay.
1 RMU DESIGN FEATURES
All design features of the proposed RMU, as described in the supplier’s bid and in the
bid’s reference materials, shall be fully supported by the equipment actually delivered.
The key design features include those that relate to:
•
•
•
•
•
Maintainability, expandability, and life span
Ability to operate in severe outdoor environmental conditions.
Immunity to electrical stress and disturbance.
Acceptable insulation properties.
Convenient FRTU interconnection features.
INDOOR RMU
1. MODULAR DESIGN, PANEL TYPE WITH F R O N T CABLE ACCESS.
2. RMU M U S T BE MADE OF ROBOTICALLY / TIG / MIG /LASER/ MANUALLY WELDED
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STAINLESS STEEL.
3. Offered RMU must be extensible.
OUT DOOR RMU
1. Stainless steel enclosure for OUT DOOR RMU application. The manufacturers shall
conform the normal current ratings mentioned in GTP at 45 deg. Ambient without
derating or as per IEC Standard
2. Enclosure with I.P.54 standard protection.
3. Offered RMU must be extensible.
4. Cable boxes shall be on Front side.
5. RMU ENCLOSURE MUST BE SHIELDED AGAINST SOLAR IRRADIATION AND TESTED FOR
AMBIENT OF 45 DEGREE C. The manufacturers shall conform the normal current
ratings mentioned in GTP at 45 deg. Ambient without derating, however, design for
higher ambient temperature than 45 degree may be admissible.
1.8 TAKE OFF TERMINAL UNITS FOR AUTOMATION:
The RMU should be provided with necessary take off terminal units for automations,
located in the front recesses / LV cubical of the RMU. The connectivity to the FRTU for
SCADA purpose shall be provided.
1.9 ISOLATORS (LOAD BREAK TYPE)
The load break isolators for Incoming and Outgoing supply must be provided. These
should be fully insulated by SF6 gas. The load break isolators shall consist of 630 Amp
fault making/load breaking spring assisted ring switches, each with integral fault
making earth switches. The switch shall be naturally interlocked to prevent the main
and earth switch being switched “ON‟ at the same time. The selection of the main
and earth switch is made by a lever on the facia, which is allowed to move only if the
main or earth switch is in the off position. The load break isolators should have the
facility for remote operation. Each load break switch shall be of the triple pole,
simultaneously operated, automatic type with quick break contacts and with integral
earthing arrangement. The isolating distance between the OFF and the ON position in
the isolator should be sufficient to withstand dielectric test as per IS/IEC, so as to have
enough isolating distance for ensuring safety during DC injection for Cable testing.
LOAD BREAK SWITCH SHOULD HAVE THE FOLLOWING
Motor operated 24 KV, 630A Load Break switch and manually operated Earthing Switch
with making capacity.
“Live Cable” LED Indicators thru Capacitor Voltage Dividers mounted on the bushings.
Mechanical ON/OFF/EARTH Indication
Anti-reflex operating handle
Cable Testing facility without disconnecting the cable terminations, cable joints and
terminal protectors on the bushings. Cable terminations Cable boxes suitable for 1 X 3C
x 300 sq mm XLPE Cable with right angle Cable Termination Protectors.
1.10 EARTHING OF ISOLATORS AND BREAKERS (EARTH SWITCH)
Necessary arrangements are provided at Load break isolators Breaker for selecting
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Earth position. Mechanical interlocking systems shall prevent the RMU function from
being operated from the “ON” to “Earth On” position without going through the
“OFF” position.
1.11 DISTRIBUTION TRANSFORMER/FEEDER BREAKER (VACUUM)
The VCB breaker for the controlling of DT/Feeder Breaker must be provided inside
welded stainless steel SF6 gas tank with the outdoor metal clad enclosure. The VCB
circuit breaker must be a spring assisted three positions with integral fault making earth
switch. The selection of the main/earth switch lever on the facia, which is allowed to
move only if the main or earth switches is in the off position.
The manual operation of the circuit breaker shall not have an effect on the trip spring.
This should only be discharged under a fault (electrical) trip; the following manual reset
operation should recharge the trip spring and reset the circuit breaker mechanism in the
main off position.
The circuit breaker shall be fitted with a mechanical flag, which shall operate in the
event of a fault (electrical) trip occurring. The “tripped” flag should be an
unambiguous colour differing from any other flag or mimic. Both the circuit breaker and
ring switches are operated by the same unidirectional handle. The protection on the
circuit breaker shall comprise of the following components:3 class X protection CT‟s,
a low burden trip coil and
a self powered (No external DC or AC source required) IDMT protection relays
(Numeric/Micro processor based) 3 x over current and earth fault element shall be
Definite Time type relay . The protection system should be suitable for protecting
transformers of rated power from 250 KVA on wards. The relay should be housed within
a pilot cable box accessible.
Circuit Breaker should have the following:
- Motor operated 200 A - 400 A – 600 A / 630A SF6 insulated Vacuum circuit breaker and
Ear thing Switch with making capacity.
- Mechanical tripped on fault indicator
- Auxiliary contacts 4NO and 4NC
- Anti-reflex operating handle
- “Live Cable” LED Indicators thru Capacitor Voltage Dividers mounted on the bushings.
- O/C + E/F self powered relay
- Shunt Trip circuit for external trip signal
- Mechanical ON/OFF/EARTH Indication
- Cable boxes suitable for 1 X 3C x 300 sq mm XLPE Cable with right angle Cable
Termination / protectors / boots.
4.0 TECHNICAL DATA
4.1 RING MAIN UNIT, ELECTRICAL DATA
Electrical data and service conditions
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Sr.
no.
Rated voltage
KV
24/26 KV
1
Power frequency withstand voltage
KV
50
2
Impulse withstand voltage
KV
125
3
Rated frequency
Hz
50
4
Rated current busbars
A
630
5
Rated current (cable switch)
A
630
6
Rated current (T-off)
A
200-400-600/ 630
Breaking capacities:
7
active load
A
630
8
closed loop (cable switch)
A
630
9
off load cable charging (cable switch)
A
135
10
earth fault (cable switch)
A
200
11
earth fault cable charging (cable switch)
12
short circuit breaking current (T-off
circuit
breaker)
kA
20 / 21
13
Rated making capacity
kA
50/52.5
14
Rated short time current 3 sec.
kA
16
115
Ambient temperature:
15
Maximum value
°C
+ 45
16
Maximum value of 24 hour mean
°C
+ 40
17
Minimum value
°C
10
18
Altitude for erection above sea level4
m
...1000
19
Relative humidity
Max 95%
4.2 Ring Main Unit Technical data (22KV)
No.
1
General data, enclosure and dimensions
Standard to which Switchgear complies
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2
Type of Ring Main Unit
3
4
5
6
Number of phases
Whether RMU is type tested
Whether facility is provided with pressure relief
Insulating gas
Metal Enclosed, Panel type, Compact
Module.
3
Yes
Yes
SF6
1.4 bar @ 20° C. However offer with
Nominal operating gas pressure shall be as
per manufacturer standard and suitable to
satisfy the rated dielectric strength can
be accepted
7
Nominal operating gas pressure
8
9
Gas leakage rate / annum
Expected operating lifetime
0.075%
30 years
10
Whether facilities are provided for gas
monitoring
Yes, temperature compensated
manometer can be delivered
11
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Material used in tank construction
Operations, degree of protection and colours
Means of switch operation
Means circuit breaker operation
Rated operating sequence of Circuit Breaker
Total opening time of Circuit Breaker
Closing time of Circuit Breaker
Mechanical operations of switch (co)
Mechanical operations of CO earthing switch
Mechanical operations of circuit breaker (co)
Principle switch / earth switch
Degree of protection:
High Voltage live parts, SF6 / VCB tank
Front cover mechanism
Cable covers
Outdoor Enclosure
Colours:
Front cover
Side and cable cover
Stainless steel sheet, minimum 2
mm (Less/More than 2 mm
thickness may be admissible
subject to IEC testing)
separate handle
separate handle and push buttons
O - 3min-CO-3min-CO
approx. 45ms
approx. 40ms
1000
1000
2000
3 position combined switch / earth
switch
IP 67
IP 2X
IP 3X
IP 54
1.12 BUSHINGS
The units are fitted with the standardized bushings that comply with IEC standards.
All the bushings are the same height from the ground and are protected by a cable
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cover.
1.13 CABLE BOXES
All the cable boxes shall be air insulated suitable for dry type cable terminations and
should have front access. The cable boxes at each of the two ring switches should be
suitable for accepting HV cables of sizes 3c x 300 sq.mm and circuit breaker cable
suitable up to 3cx300 sq.mm. The cable boxes for an isolator in its standard design
should have sufficient space for connecting two cables per phase of 3c x 150 sq.mm.
Necessary Right angle Boot should be supplied to the cable terminations .The type of
the Right angle Boot should be cold applied insulating Boot.
1.14 CABLE TESTING FACILITY
It shall be possible to test the cable after opening the cable boxes. The cable boxes
should open only after operation of the earth switch. Thus ensuring the earthing of the
cables prior to performing the cable testing with DC injection.
1.15 VOLTAGE INDICATOR LAMPS AND PHASE COMPARATORS
The RMU shall be equipped with a voltage indication to indicate whether or not there
is voltage on the cable. There should be a facility to check the synchronization of
phases with the use of external device. It shall be possible for the each of the function
of the RMU to be equipped with a permanent voltage indication as per IEC 601958 to
indicate whether or not there is voltage on the cables.
1.16 NON EXTENSIBLE
Each combination of RMU shall have the provision for extension by load break
isolators / breakers in future, with suitable accessories and necessary Bus Bar. The
equipment shall be well designed to provide any kind of extension / trunking chamber
for connecting and housing extensible Busbars. Extensible isolators and circuit
breakers shall be individually housed in separate SF6 gas enclosures. Multiple devices
inside single gas tank / enclosure will not be acceptable. In case of extensible circuit
breakers, the Breaker should be capable of necessary short circuit operations as per
IEC at 16 KA, and the Breaker should have a rated current carrying capacity of 200 A400A-600/630 A.
1.17 WIRING & TERMINALS:
The wiring should be of high standard and should be able to withstand the tropical
weather conditions. All the wiring and terminals (including take off terminals for
future automation, DC, Control wiring), Spare terminals shall be provided by the
contractor. The wiring cable must be standard single-core non-sheathed, Core
marking (ferrules), stripped with non-notching tools and fitted with end sleeves,
marked in accordance with the circuit diagram with printed adhesive marking strips.
The wiring should be of high standard and should be able to withstand the tropical
weather conditions. All wiring shall be provided with single core multi-strand copper
conductor wires with P.V.C insulation.
The wiring shall be carried out using multi-strand copper conductor super flexible PVC
insulated wires of 650/1100V Grade for AC Power, DC Control and CT circuits.
Suitable colored wires shall be used for phase identification and interlocking type
ferrules shall be provided at both ends of the wires for wire identification. Terminal
should be suitably protected to eliminate sulphating. Connections and terminal should
be able to withstand vibrations. The terminal blocks should be stud type for controls
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and disconnecting link type terminals for CT leads with suitable spring washer and lock
nuts.
Flexible wires shall be used for wiring of devices on moving parts such as swinging
Panels (Switch Gear) or panel doors. Panel wiring shall be securely supported, neatly
arranged readily accessible and connected to equipment terminals, terminal blocks
and wiring gutters. The cables shall be uniformly bunched and tied by means of PVC
belts and carried in a PVC carrying trough.
The position of PVC carrying trough and wires should not give any hindrance for
fixing or removing relay casing, switches etc., Wire termination shall be made with
solder less crimping type of tinned copper lugs. Core identification plastic ferrules
marked to correspond with panel wiring diagram shall be fitted with both ends of each
wire. Ferrules shall fit tightly on the wire when disconnected. The wire number shown
on the wiring shall be in accordance with the IS.375.
All wires directly connected to trip circuits of breaker or devices shall be
distinguished by addition of a red color unlettered ferrule.
Inter-connections to adjacent Panels (Switch Gear) shall be brought out to a separate
set of Terminal blocks located near the slots or holes to be provided at the top
portion of the panel. Arrangements shall be made for easy connections to adjacent
Panels (Switch Gear) at site and wires for this purpose shall be provided and bunched
inside the panel. The bus wire shall run at the top of the panel.
Terminal block with isolating links should be provided for bus wire. Ateast 10% of total
terminals shall be provided as spare for further connections. Wiring shall be done for all
the contacts available in the relay and other equipment and brought out to the terminal
blocks for spare contacts. Color code for wiring is preferable in the following colours.
Voltage supply :
Red, Yellow, Blue for phase and Black for Neutral
CT circuits
:
similar to the above
DC circuits
:
Grey for both positive and negative
250V AC circuits :
Earthing
Black for both phase and neutral
:
Green
The wiring shall be in accordance to the wiring diagram for proper functioning of the
connected equipment. Terminal blocks shall not be less than 650V grade and shall be
piece-molded type with insulation barriers.
The terminal shall hold the wires in the tight position by bolts and nuts with lock
washers. The terminal blocks shall be arranged in vertical formation at an inclined angle
with sufficient space between terminal blocks for easy wiring.
The terminals are to be marked with the terminal number in accordance with the
circuit diagram and terminal diagram. The terminals should not have any function
designation and are of the tension spring and plug-in type.
Clear empty Space shall be mandatorily provided in RMU Panel for mounting FRTU
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Panel. Dimensions details of required space for FRTU are about 1000 mm H x 600 mm
W x 300 mm D. 230V AC Supply for charging of FRTU battery should be available. The
Aux supply will be taken through the PT provided for metering in RMU. We require
230V AC and not 110V AC. FRTU will require power up to 110 VA depending upon
RMU configuration. The PT must have sufficient burden for meeting the aforesaid
requirement also for battery charging.
1.18 EARTHING
The RMU outdoor metal clad, Switch Gear, Load break isolators, Vacuum circuit
breakers shall be equipped with an earth bus securely fixed along the base of the RMU.
The size of the earth bus shall be made of IEC/IS standards with tinned copper
flat for RMU and M.S. Flat for Distribution Transformer, earth spike and neutral
earthing. Necessary terminal clamps and connectors shall be included in the scope of
supply.
All metal parts of the switchgear which do not belong to main circuit and which can
collect electric charges causing dangerous effect shall be connected to the earthing
conductor made of copper having CS area of minimum 75 mm. Each end of conductor
shall be terminated by M 12/equivalent quality and type of terminal for connection to
earth system installation. Earth conductor location shall not obstruct access to cable
terminations.
The following items are to be connected to the main earth conductor by rigid or copper
conductors having a minimum cross section of 75 mm (a) earthing switches (b) Cable
sheath or screen (c) capacitors used in voltage control devices, if any.
The metallic cases of the relays, instruments and other panel mounted Equipments
shall be connected to the earth bus by independent copper wires of size shall be made
of IEC/IS standards. The colour code of earthing wire shall be green. Earthing wires
shall be connected on the terminals with suitable clamp connectors and soldering shall
not be permitted.
1.19 ACCESSORIES & SPARES:
The following spares and accessories shall be supplied along with the main equipments
at free of costs. This shall not be included in the price schedule.
1. Charging lever for operating load break isolators & circuit breaker of each RMU.
2. The pressure gauges indications - 1 numbers
Provision shall be made for padlocking the load break switches/ Circuit breaker, and
the earthing switches in either open or closed position with lock & master key.
1.20 TESTING OF EQUIPMENT & ACCESSORIES:
Provision for testing CTs, PTs, Relays, Breakers and Cables shall be made
available. Procedure and schedule for Periodical & Annual testing of equipments,
relays, etc. shall be provided by the supplier.
1.20.1 TYPE TEST
The tenderers should, along with the tender documents, submit copies of all Type test
certificate of their make in full shape as confirming to relevant ISS/IEC of latest issue
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obtained from a International/National Govt. Lab/Recognized laboratory.
The above type test certificates should accompany the drawings for the materials duly
signed by the institution who has type test certificate. The details of type test
certificate as per Schedule F.
1.20.2 ACCEPTANCE AND ROUTINE TESTS
All acceptance and routine tests as stipulated in the latest IEC- shall be carried out by
the supplier in the presence of DGVCL’s representative. The supplier shall give at
least 7 days advance intimation to the Board to enable them to depute their
representative for witnessing the tests. The partial discharge shall be carried out as
routine test on each and every completely assembled RMU gas tank and not on a
sample basis. As this test checks and guarantees for the high insulation level and thus
the complete life of switchgear.
1.20.3 ADDITIONAL TESTS
The Board reserves the right for carrying out any other tests of a reasonable
nature at the works of the supplier/laboratory or at any other recognized
laboratory/research institute in addition to the above mentioned type, acceptance and
routine tests at the cost of the Board to satisfy that the material complies with the
intent of this specification.
1.20.4 PRE-COMMISSIONING TESTS
All the pre-commissioning tests will be carried out in the presence of the Board
testing engineer and necessary drawing manual and periodical test tools shall be
arranged to be supplied.
During the above tests the contractor representative should be present till the RMUs are
put in to service.
1.21 INSPECTION:
The inspection may be carried out by the DGVCL at any stage of manufacture. The
supplier shall grant free access to DGVCL’s representative at a reasonable time when
the work is in progress. Inspection and acceptance of any equipment under this
specification by the DGVCL shall not relieve the supplier of his obligation of
furnishing equipment in accordance with the specification and shall not prevent
subsequent rejection if the equipment is found to be defective.
The supplier shall keep the DGVCL informed in advance, about the manufacturing
programme so that arrangement can be made for inspection. The DGVCL reserves the
right to insist for witnessing the acceptance/routine testing of the bought out items.
The DGVCL has rights to inspect the supplier’s premises for each and every
consignment for type & routine test.
No material shall be dispatched from its point of manufacture unless the material has
been satisfactorily inspected and tested / unless the same is waived by the DGVCL in
writing.
1.21.1 QUALITY ASSURANCE PLAN:
The bidder shall invariably furnish following information along with his offer / in case of
event of order. I. Statement giving list of important raw materials including but not
limited to
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a) Contact material
b) Insulation
c) Sealing material
d) Contactor, limit switches, etc. in control cabinet.
Name of sub-suppliers for the raw materials, list of standards according to which the
raw materials are tested, list of test normally carried out on raw materials in presence
of Bidder’s representative, copies of test certificates.
II. Information and copies of test certificates as in (I) above in respect of bought out
accessories & raw materials. III. List of areas in manufacturing process, where stage
inspections are to be carried out.
IV. Normally carried out for quality control and details of such tests and inspections. V.
Special features provided in the equipment to make it maintenance free.
VI. List of testing equipment available with the Bidder for final testing of RMUs and
associated combinations vis-à-vis the type, special, acceptance and routine tests
specified in the relevant standards. These limitations shall be very clearly brought
out in the relevant schedule i.e. schedule of deviations from specified test
requirements. The supplier shall, within 15days from the date of receipt of Purchase
Order submit following information to the DGVCL.
a) List of raw materials as well bought out accessories and the names of sub-suppliers
selected from those furnished along with offer.
b) Necessary test certificates of the raw material and bought out accessories.
c) Quality Assurance Plan (QAP) with hold points for DGVCL’s inspection. The quality
assurance plan and hold points shall be discussed between the DGVCL and supplier
before the QAP is finalized.
The supplier shall submit the routine test certificates of bought out items and raw
material, at the time of routine testing of the fully assembled breaker.
1.22 TRAINING:
The supplier shall give rigorous training to the engineers & staff for 2 days in
attending trouble shooting and maintenance.
1.23 SCADA CONNECTIVITY:
Provision shall be made in all the RMUs with necessary take off terminal units for
automations and connectivity with FRTU. The all RMUs shall be motorized type and
compatible for SCADA operation. All the I/O signals need to be brought to the
Terminal Strip on a Din Rail, also the Din Rail should have space to mount the MFT’s
pr ovi ded by SIA. All the DI’s should be provided as potential free contacts. The
CT/PT should provide metering grade core for connecting MFT provided with FRTU.
Refer Annexure-1.
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The RMU should be provided with provision of following minimum signals available at
separate SCADA terminal box. Minimum
signals for SCADA/DMS - to be wired to
Separate TBs CB close / open
potential free contacts.
LBS close / open
potential free contacts
LBS & CB Earth Switch close
/open
potential free contacts
CB Test/Service Position
potential free contacts
Spring charge Status indication
potential free contacts
SF6 gas pressure low
potential free contacts
O/C Operated
potential free contacts
E/F Operated
potential free contacts
Local/Remote
potential free contacts
Common Power Supply Healthy
potential free contacts
Motor MCB Healthy Status
potential free contacts
Battery charger Fail
potential free contacts
RMU Door Open
potential free contacts
CB Trip Coil Healthy
potential free contacts
CT & PT
For SCADA Metering
FPI Control
FPI remote resetting for SCADA
CB control
Control from SCADA
LBS Control
Control from SCADA
1.24 DOCUMENTATION and DRAWINGS
All drawings shall conform to relevant International Standards Organization (ISO)
Specification. All drawings shall be in ink and suitable for microfilming.
The tenderer shall submit along with his tender dimensional general arrangement
drawings of the equipments, illustrative and descriptive literature in triplicate for
various items in the RMUs which are all essentially required for future automation.
I.
Schematic diagram of the RMU panel
II.
Instruction manuals
III.
Catalogues of spares recommended with drawing to indicate each items of
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spares
IV. List of spares and special tools recommended by the supplier.
V.
Copies of Type Test Certificates as per latest IS/IEC.
VI. Drawings of equipments, relays, control wiring circuit, etc. VII. Foundation
drawings of RMU and D.T. Structure.
VIII. Dimensional drawings of each material used for item VII.
IX.
Actual single line diagram of RMU/RMUs with or without Extra combinations
shall be made displayed on the front portion of the RMU so as to carry out the
operations easily.
The following should be supplied to each consignee circle/town along with the
initial supply of the equipments ordered.
a. Copies of printed and bound volumes of operation, maintenance and erection manuals
in English along with the copies of approved drawings and type test reports etc.
b. Sets of the manuals as above shall be supplied to the Chief Engineer/Distribution. A
soft copy of the all Technical and Drawing furnished in a CD.
1.25 NAME PLATE:
Each RMU and its associated equipments shall be provided with a nameplate legible and
indelibly marked with at least the following information.
a. Name of manufacturer
b. Type, design and serial number c. Rated voltage and current
d. Rated frequency
e. Rated symmetrical breaking capacity f. Rated making capacity
g. Rated short time current and its duration
h. Purchase Order number and date i. Month and Year of supply
j. Rated lighting impulse withstand voltage
k. Feeder name (Incoming and Outgoing), DTs Structure name, 11000 Volts Dangers etc.
NOTE:
III) THE WORD RATED NEED NOT APPEAR ON THE NAME PLATE. RECOGNIZED
ABBREVIATIONS MAY BE USED TO EXPRESS THE ABOVE PARTICULARS.
IV) WHETHER THE CIRCUIT BREAKER IS FITTED WITH CLOSING/TRIPPING DEVICES
NECESSITATING AN AUXILIARY SUPPLY SHALL BE STATED EITHER ON THE CIRCUIT
BREAKER NAME PLATE OR ANY OTHER ACCEPTABLE POSITION.
1.26 FAULT PASSAGE INDICATORS (FPI):
These shall facilitate quick detection of faulty section of line. The fault indication
may be on the basis of monitoring fault current flow through the device. The unit should
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be self-contained requiring no auxiliary power supply. The FPI shall be integral part
of RMU. The FPI shall have LCD/LED display, automatic reset facility. FPI Reset from
SCADA will be through momentary closure of a potential free contact from FRTU. The
sensors to be bushing mounted. The number of FPI should be put in all the three phases
of the outgoing branch of the RMUs FPI should have suitable connectivity with the FRTUs
for the SCADA purpose. The FPI inside the RMU may be non communicable and hard
wired to the TB for the signals. Refer Annexure-1
Fault Passage indicator OK
Fault Passage indicator operated
1.27 TROPICALISATION
Due regard should be given to the climatic conditions under which the equipment is to
work. Ambient temperatures normally vary between 20 deg C and 40 d e g C, although
direct sun temperature may reach 45 deg C. The climate is humid and rapid variations
occur, relative humidity between 60% and 95% being frequently recorded, but these
values generally correspond to the lower ambient temperatures. The equipment should
also be designed to prevent ingress of vermin, accidental contact with live parts and
to minimize the ingress of dust and dirt. The use of materials which may be liable to
attack by termites and other insects should be avoided.
1.28 MOTORIZATION:
All the functions within the RMU i.e. Isolators/Breakers should be fitted with motor
mechanism and closing coil making it suitable to make it on from remote.( However,
manual mechanism should be possible in case of failure/ non working of motor)
Other Accessories (required with RMU):a) Shunt Trip Coil (Coil voltage shall be indicated later on)
b) Battery & Battery Charger.
c) 4NO+4NC auxiliary contacts.
1.29 METERING:
Multifunction Energy meter shall be provided by DGVCL with, of accuracy class of 0.5 at
incoming isolator of all RMUs. The Metering CTs and PTs of suitable rating shall be
provided by bidder/EPC contractor and wired in SCADA terminal TBs. Refer Annexure-1.
1.30 TECHNICAL SPECIFICATION FOR RMU
1.30.1 11KV/22KV Bus Bar
I.
Current Carrying Capacity
: 630 Amps.
II.
Short time rating current for 3 secs. : 16 KA for 22 kv
III.
Insulation of bus bar
: SF6
IV.
Bus bar connections
: Anti-oxide grease
1.31
PARAMETERS FOR SWITCH GEAR OF DT AND LOAD BREAK ISOLATORS
I.
Type
: Metal enclosed
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II.
No of Phases
:3
III.
No. of poles
:3
IV.
Rated voltage
:24KV
V.
Operating voltage
:22 KV(+10% to -20%)
VI.
Rated lightning impulse withstand voltage :125 KV
VII.
Rated power frequency withstand voltage :50 KV VIII.
IX.
Rated filling level for insulation
Insulating gas :SF6
:As Per IEC. Max.
permissible site altitude at the above gas pressures : 1000m (The operating pressure has
to be adjusted for greater altitudes) Isolating distance between ON and OFF position in
isolator :80 mm (min).
Rated short time current
:16 KA.for 22 kv
Rated short time
:3s
Rated peak withstand current
:50/52.5 KA.
No of operations in Short circuit
:15 Nos (minimum)
Operating mechanism: Circuit breaker with spring assisted anti reflex mechanism.
Rated current (Bus):
Rated current (breaker)
:630 A
:200-400-600/630 A Circuit Breaker interrupter
SF6 insulated VCB Rated frequency : 50 Hz
Rated operating sequence
:O-3min- CO
Number of mechanical/Remote operations for earthing: As per IEC & Ring switches &
Number of mechanical/ remote operations for circuit breakers 60298
1.32 PRINCIPAL FEATURES
Sr.
No.
1
2
3
4
5
6
7
DESCRIPTION
Breaker
Circuit label
Mimic diagram
Supply voltage indication
Current Transformer
Self Powered based Microprocessor based IDMT
Relay (3OL)/EL
Anti - Reflexing Relay
Interlock to defeat the operation of the line side
earthing when the line side isolator is ON.
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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8
9
10
11
12
13
Interlock to defeat the operation of the earthing
when the breaker is in service position and is ON.
Breaker ON/OFF indication
Spring Charge indication / Spring assisted
mechanism.
Fault Tripping indication
Bus bar end caps
Whether the SF6 gas pressure gauge indicator and
filling arrangement.
Yes
Yes
Yes
Yes
Yes
Yes
14
Whether the spring assisted mechanism with
operating handle for ON/OFF.
Yes
15
Whether the earth positions with arrangement for
padlocking in each position and independent
manual operation with mechanically operated
indicator are provided
Yes
16
RMUs are provided with necessary take off
terminals for future automation.
Yes
1.33 EARTHING SWITCH FOR 22 KV LINE SIDE ISOLATION AND DT
Rated short time current
: 16 KA.for 22 kv. Rated short time
Rated peak withstand current :50/52.5 KA Interlocking facility:
1) Between 22 KV Line side isolator “ON”&Earthing.
2) Between 22 KV DT side breaker on close condition & earthing
:3s
1.34 CURRENT TRANSFORMERS FOR BREAKER
CT Type
: Tape wound
CT Description : The CTs of breaker shall be Suitable for sensing the minimum primary
variable current in the order of 10-200 A and the secondary current for the CT is 1 A.
The CT shall be housed in outside SF6 chamber for testing and Maintenance
Accuracy Class: class X/5P10 protection
Rated burden: Suitable for self powered relay and metering.
PART A&B: TECHNICAL SPECIFICATION FOR FIXING OF END TERMINATION AND
STRAIGHT THROUGH JOINTS FOR OUTDOOR 11/22 KV RING MAIN UNIT SWITCHGEAR
(In bidder’s scope)
SUPPLY &FIXING OF END TERMINATION & STRAIGHT THROUGH JOINTS (IN BIDDER’S
SCOPE).
1.0 (i) Contractor should clarify the make of cable end termination. The heat &
shrink type end termination shall be utilized for the job.
(ii) After completing work of cable laying end termination, following test shall
be carried out jointly by engineer in charge of DGVCL and contractor.
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(iii) Insulation resistance test before & after with 5 KV insulation tester. (A) Hypo
test
(iv) Contractor has to furnish Guaranteed Technical Parameters (GTP) type
test certificate of various tests conducted at any Govt./ NABL approved
laboratory for the End Termination Kit they intend to supply for this job. The
test certificate should not be prior to 5 years from the date of tender. The
contractor shall have to submit the same with technical bid and failure in
which technical bid will be disqualified & the price bid of that party will not be
opened.
(v) One competent skilled supervisor shall have to co-ordinate the site authority
and he has to do all communication with engineer in charge of DGVCL.
(vi) It is essential to have suppliers certificate of training for cable jointing of cable
jointer.
(vii) Jointer has to ensure safety while making joints so that other nearby cables
will not damaged.
(viii) The material of End termination kit will be inspected at manufacturer’s
works by the inspector of DGVCL. The bidder has to give inspection call 15 days
in advance to S.E. (O&M) for the works to be carried out in their jurisdiction.
2.0 The Bidder shall have to supply cable end Terminal kit as per IS 13573-1992 with
latest amendment No. 2, 1998 IEEE 48-1990 and shall be Class -1, ESI-09-13
performance specification for high voltage cable accessories.
3.0 The work of laying of cable along the road / road crossing to be carried
out by Horizontal Drilling Machine / Auger boring machine enclosed in HDPE Pipe
only.
CLASS OF TERMINATION:
The XLPE 11/22 KV Link Line shall be class 1 termination as per appropriate ISI code
nos. i.e. IEEE-48-1990.
APPLICABLE STANDARDS:
IS 13573-1992 with latest amendment – Latest amendment No. 2, 1998. IEEE 48-1990.
The termination shall be Class 1. ESI-09-13 performance specification for high voltage
cable accessories. The cable accessories being supplied in the form of kit which has
different components to be assembled at site.
MATERIALS:
The term 22 kV XLPE Cable refers to extruded or Molded Polymeric. Polymeric
material which are cross linked by gamma radiation to develop elastic memory and
supplied in an expanded or otherwise deformed size and shape. Bidders should submit
the proof that the tubes are cross linked by gamma radiations. However chemically
cross linked, crotch seal and lug seals are permitted. For end termination kit, the
insulation over the ferrules should be reinsulated by dual wall tubing. This should
have an inner insulating layer vulcanized to an outer semi-conducting layer. This is
required to ensure reconnection of cable insulation screen of the core from one end of
the joint to the other. The dual wall tubing ensures that there is no entrapment of
air pockets between the insulating and semi-conducting layers.
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FOR JOINTS:
22 kV XLPE underground flexible polymeric tubing, preferably black colored pre coated
with adhesive shall be provided for sealing the exposed metallic sheaths and
sheath/earth connections.
PROVISION OF ADDITIONAL CREEPAGE INDOOR / OUTDOOR TERMINATIONS:
Single piece, 22 KV XLPE underground cable, weather sheds having non-tracking, erosion
and weather resistant properties shall be supplied with the kits for application over
non-tracking tubing. The quantity of sheds to be supplied shall depend on voltage grade
and indoor/outdoor application and shall be indicated along with offer. Each shed shall
give an additional creepage length of at least 100mm.
INSULATION AND SCREEN REINSTATEMENT FOR END TERMINAL KITS:
The reinstatement of insulation shall be by means of heat shrinkable, flexible,
polymeric tubing made from a discharge resistant polymer, preferably colored red. The
tubing after complete recovery shall have a minimum wall thickness to ensure
provisions of adequate insulation in step.
EARTH & SCREEN CONTINUITY FOR TERMINATION:
Screen continuity by using tinned copper mesh and earth continuity by using tinned
copper braids of appropriate size shall be provided for transfer of screen/earth. In
termination, tinned copper braids of appropriate size or equivalent current
carrying capacity of cable conductor along with copper lugs of appropriate size shall
be provided for continuity of screen to armour to the earth.
LUGS & FERRULES:
The requisite number and type of aluminum/ copper lugs/ferrules shall be provided for
termination/joints. The Lugs and ferrules for XLPE cables shall be crimping type suitable
for compacted circular conductor having two nos. of holes.
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1.2
TECHNICAL SPECIFICATION FOR
OUTDOORS TYPE DISTRIBUTION
TRANSFORMERS OF 11/22KV/433250V CLASS 500 KVA WITH CRGO/
AMORPHOUS METAL CORE
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1.0
SCOPE:
This specification covers, engineering, manufacture, assembly, stage testing,
inspection and testing before supply and delivery at site of oil immersed,
naturally cooled 3 phase 11 kV/433 - 250 V & 22KV/ 433-250 V Distribution
Transformers for outdoor use.
1.1
It is not the intent to specify completely herein all the details of the design and
construction of equipment. However the equipment shall conform in all respects
to high standards of engineering, design and workmanship and shall be capable
of performing in continuous commercial operation up to the Bidder’s guarantee,
in a manner acceptable to the purchaser, who will interpret the meanings of
drawings and specification and shall have the power to reject any work or
material which, in his judgment is not in accordance therewith. The offered
equipment shall be complete with all components necessary for their effective
and trouble free operation. Such, components shall be deemed to be within the
scope of Bidder’s supply irrespective of whether those are specifically brought
out in this specification and / or the commercial order or not.
1.2
STANDARD RATINGS:
The Standard Ratings shall be 500 KVA.
2.0
STANDARDS:
2.1.
The materials shall conform in all respects to the relevant Indian / International
Standard Specification, with latest amendments thereof; some of them are listed
below:
Indian Standard
Title
ISS -2026/1977
Specification for Power Transformer
ISS - 1180
Outdoor distribution Transformer upto
and including 100 kVA
IS 12444
Specification for Copper wire rod
ISS -3347/1967
Specification for porcelain Transformer
bushing
ISS-335/1983
Specification for Transformer Oil
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International &
Internationally
recognized standard
IEC 76
ASTM B-49
DIN 42531,23,3
BS 148, D-1473, D-15331934
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IEC Pub 296-1969
ISS 5/1961
Specification for colors for ready mixed
paints
ISS - 2099/1973
Specification for High Voltage Porcelain
bushings
ISS - 7421/1974
Specification for Low Voltage bushings
ISS - 3347
Specification for Outdoor Bushings
ISS - 5484
Specification for Al Wire rods
ISS - 9335
Specification for Insulating Kraft Paper
IEC 554
ISS - 1576
Specification for Insulating Press Board
IEC 641
ISS- 6600/1972
Guide for loading
Transformers
IEC 76
ISS-649
Testing of Steel Sheets & Strips For
Magnetic circuits
ISS-6162(PartI&II)
Paper covered Aluminum Conductor
ISS-10028
Installation,
Transformers
ISS-4257
Dimension for clamping arrangement for
bushings (for porcelain and metal parts)
ISS- 6160
Rectangular conductors
machine
ISS- 3401
of
oil
Maintenance
for
DIN 42531 to 33
ASTM B - 233
Immersed
Of
electrical
Silica gel
Code of practice for maintenance &
supervision of Mineral insulating oil in
equipment
ISS-1866
Material conforming to other internationally accepted standards, which ensure equal or
higher quality than the standards mentioned above, would also be acceptable. In case
the Bidders who wish to offer material conforming to the other standards, salient points
of difference between the standards adopted and the specific standards shall be clearly
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brought out in relevant schedule. Four copies of such standards with authentic English
translations shall be furnished along with the offer.
3.0 SYSTEM DETAILS:
The transformers shall be suitable for outdoor installation with 3 phase 50 Hz, 22KV
system in which the neutral is effectively earthed and they should be suitable for
service under fluctuations in supply voltage up to plus 10% to minus 15%.
3.1.
SERVICE CONDITIONS:
The Distribution Transformers to be supplied against this Specification shall be suitable
for satisfactory continuous operation under the following climatic conditions as per IS
2026 (Part - I ) Latest Revision
i)
Location
ii)
Max ambient air
: At various locations in Gujarat
temperature (deg.C)
iii)
0
:
45
Max. yearly weighed average
ambient temperature(deg.C)
vi)
:
Max average daily ambient
air temperature (deg.C)
v)
50
Min. ambient air
temperature (deg.C.)
iv)
:
:
40
Max. altitude above
mean sea level (Meters)
(vii) Maximum relative humidity
:
1000
:
0 to 100%
(viii) Average thunder storm days/annum:
15 nos
(ix) Average rainy days per annum
:
90 days
(x) Average annual rain fall
:
800/900MM
(xi) Number of months of tropical monsoon:
3 Months.
The equipment shall be for use in moderately hot and humid tropical climate,
conducive to rust and fungus growth.
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4.0. PRINCIPAL PARAMETERS:
The Transformers shall be suitable for outdoor installation with three phase, 50 Hz, 11
kV system in which the neutral is effectively earthed and they should be suitable for
service under fluctuations in supply voltage upto plus 10% to minus 15%.
The transformer shall conform to the following specific parameters.
Sl.
Item
Specification
No.
1.
Continuous
capacity
2.
rated
200 kVA
500 kVA
System voltage (max.)
24 kV
24 kV
3.
Rated voltage HV
22 kV
22 kV
4.
Rated voltage LV
433 - 250 V
433 - 250 V
5.
Line current HV
5.25 A
13.12 A
6.
Line current LV
266.67 A
666.68 A
7.
Frequency
50 c/s +/- 50 c/s +/- 5%
5%
8.
No. of Phases
Three
Three
9.
Connection HV
Delta
Delta
10.
Connection LV
Star
(Neutral
brought
out)
Star (Neutral
brought out)
11.
Vector group
Dyn-11
Dyn-11
12.
Type of cooling
ONAN
ONAN
13.
Tap
changing
arrangement (off load) &
to be provided on HV
+2.5 % to
+2.5 % to
side for HV variation .**
14.
Noise
level
at
rated
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Signature of the tenderer
-7.5%
in -7.5%
in
step of 2.5 step of 2.5 %
%
55 db
56 db
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Company’s Round Seal
voltage
and frequency
15.
Permissible temperature
rise
over ambient
35 Deg.C
35 Deg.C
40 Deg.C.
40 Deg.C.
355/305
355/305
75/55
75/55
75
75
55
55
i) Of top oil measured
by thermometer
ii) Of winding measured
by resistance
16.
Minimum clearances in
air of bushing terminals
with connectors fitted.
a) HV phase to phase/
phase to earth (mm)
b) LV phase
c) LV phase to neutral
(mm)
d) LV neutral to Earth
(mm)
** TAPS :
The standard tapping range of ± 2.5 % - 5.0% and –7.5 % with off circuit tap
changing switch shall be provided. The transformers shall be designed to give
their full rated output on all taps without exceeding the temperature rise limit.
The tapping shall be provided on HV side to suit variation in voltage on HV side.
The rotary tap changing switch shall be of approved design (design details and
drawings to be supplied with the offer) suitable for external manual operation on
off load. Cast indicating plate with switch with a movable pointer to be provided
to clearly show tap position number. The tap switch shall be provided with
locking arrangement with lock and key.
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5.0.
TECHNICAL REQUIREMENTS:
5.1.1 MATERIAL - CRGO/ AMORPHOUS METAL:
a)
CRGO Material (Our Requirement):
i)
The core shall be of NEW high grade cold rolled grain annealed steel lamination
having low loss and good grain properties, coated with hot oil proof insulation,
bolted together and to the frames firmly to prevent vibration or noise. The
complete design of core must ensure permanency of the core losses with
continuous working of the transformers. The value of the maximum flux density
allowed in the design and grade of lamination used shall be clearly stated in the
offer.
ii)
Core Clamping for CRGO:
1. MS channel shall be used on top and bottom
2. Core Channel on LV side to be reinforced at equidistance, if holes / cutting is
done for LT lead in order to avoid bending of channel.
3. MS Channels shall be painted with varnish or oil-resistant paint.
iii)
The transformers core shall be suitable for over fluxing (due to combined effect
of voltage and frequency) upto 12.5% without injurious heating at full load
conditions and shall not get saturated. The Bidder shall furnish necessary design
data in support of this situation.
iv)
The nominal flux density in any part of the core shall not exceed 1.69 Tesla at 1.0
p.u.voltage and 1.9 Tesla at 1.1 p.u.voltage.The vendor shall furnish necessary
design data in support of this stipulation.
v)
No load current shall not exceed 3% of full load current and will be measured by
energising the transformer at 433 volts, 50 c/s on the secondary. Increase of
voltage of 433 volts by 12.5% shall not increase the no load current by Max. 6% of
full load current. Test for magnetic balance by connecting the LV phase by
phase to rated phase voltage and measurement of an, bn, cn voltage will be
carried out.
vi)
Clamping and Tie-rods shall be made from HT steel & shall be parkarised.
b)
AMORPHOUS METAL:
i)
The core shall be high quality Amorphous ribbons having very low loss formed
into wound cores of rectangular shape, bolted together to the frames firmly to
prevent vibration or noise. The complete design of core must ensure permanency
of the core loss with continuous working of the transformers. The value of the
flux density allowed in the design shall be clearly stated in the offer. Curve
showing the properties of the metal shall be attached with the offer.
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ii)
Core Clamping for Amorphous metal Transformers
1. Core clamping shall be with top and bottom U-shaped core clamps made of
sheet steel clamped HT steel tie rods for efficient clamping.
2. MS core clamps shall be painted with varnish or oil-resistant paint.
3. Suitable provision shall be made in the bottom core clamp / bottom plate of
the transformer to arrest movement of the active part.
iii)
The transformers core shall be suitable for over fluxing (due to combined effect
of voltage and frequency) upto 12.5% without injurious heating at full load
conditions and shall not get saturated. The Bidder shall furnish necessary design
data in support of this situation.
iv)
No load current shall not exceed 2% of full load current and will be measured by
energising the transformer at 433 volts, 50 c/s on the secondary. Increase of
voltage of 433 volts by 12.5% shall not increase the no load current by Max. 5% of
full load current. Test for magnetic balance by connecting the LV phase by
phase to rated phase voltage and measurement of an, bn, cn voltage will be
carried out.
5.2
WINDINGS:
5.2.a Materials:- Super enamel covered copper Conductor or Double paper covered
copper conductor shall be used for 22KV /200 KVA & 22KV/500 KVA or Double
paper covered aluminum conductor shall be used for 11 KV/200KVA class
transformer. A mix of copper & aluminum conductors for HV & LV winding will
not be permitted.
5.2.b. Current density for HV and LV shall not be more than 2.5 A/sq.mm. for copper
and 1.60 A/sq.mm. for aluminum conductor. (However, +5% tolerances for LV
winding is permissible)
5.2.c. LV winding shall be in even layers so that neutral formation will be at top.
The winding shall be of one or more rectangular conductors insulated from each
other to reduce eddy current losses. The tolerances on the size of the conductor
shall be as per IS-6160, specification for rectangular conductors. If the active
axial length of the coil is more than 350 mm, an axial duct, of 4 mm be provided
between the LV coil layers. The materials used for providing duct shall be noncompressible material such as treated wood permali, etc.
5.2.d. The winding construction of single HV coil wound over LV coil is preparable. This
is generally of round wire and coils are in form of packets and a number of coils
are connected in series to achieve the necessary voltage ratio. The number of
coil per limb shall depend upon the necessary cooling surface and mechanical
strength.
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The following number of coils per limb shall be minimum.
SR.
NO
MINIMUM NO. OF HV COILS
PER PHASE FOR 22 KV
KVA RATING OF
TRANSFORMER
Stacked Core
Wound Core
1
200
12 Nos.
1 No.
2
500
16 Nos.
1 No.
An axial duct of 3 mm is to be provided if the radial thickness of coils is
more than 50 mm and/or the axial length of individual coil is more than 80mm.
The
radial duct shall be adequate for free circulation of oil as well as to
withstand voltage between adjacent coils. The inter – layer insulation shall be of
epoxy coated paper or a minimum 4 layers of 2 mil ( 0.05mm) paper of
approved manufactures.
5.2.e. Inter layer insulation shall be Epoxy dotted Kraft Paper.
5.2.f. Proper bonding of inter layer insulation with the conductor shall be ensured.
Test for bonding strength to be conducted.
5.2.g. Dimensions of winding coils are very critical. Dimensional tolerances for
winding coils shall be within limits as specified in GTP.
5.2.h. Taps shall be made on the primary winding
variations.
for -7.5% to +2.5% for HV
5.2.E. INSULATION MATERIAL & CLEARANCES:
5.2..e(i).Materials Electrical grade insulating craft paper of Triveni/ Ballarpur/
Cauvery or equivalent make subject to approval of the purchaser shall be
used.
Similarly Press Board of Senapaty, Whitelay or Raman make or equivalent
subject to the approval of the purchaser shall be used. Perma wood or Haldi
wood blocks shall be used for top and bottom yoke insulation.
INTERNAL CLEARANCES
Where active length of LV coil is
For 22 KV Dist.
X’mer
350 mm or less.
Stacked
Core
Wound
Core
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More than 350 mm
Stacked
Core
Wound Core
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(i) LV coil to
core circle
3mm
1.5mm
4mm
1.5mm
(ii) LV coil to HV
coil
9mm
8mm
11mm
8mm
(iii) HV coil
phase to phase
15mm
8mm
15mm
8mm
(iv)HV coil / HV
leads to inside
surface of tank
40mm
30mm
40mm
30mm
5.2.1 OIL:
The insulating oil shall comply with the requirements of relevant standards IS 335 / 1993
or BS 148 or REC 39/1993. Oil shall be filled under vacuum of 250 tor +/- 5 %.
5.3
Losses & Labeling:
This tender is for purchase of 22KV Distribution 200-500KVA Transformers without star
rating having Amorphous/CRGO core and with capitalization cost.
The methodology for computing Total Owning Cost is as under:
TOC Formula for 22 KV/200-500KVA without star rated Transformer:
TOC (Total Owning Cost) = IC + (A X Wi) + (B x Wc)
Where,
Ic = Initial cost (without tax) of transformer as quoted by the bidder
Wi = No load losses quoted by the bidder in Watt
Wc = Load losses quoted by the bidder in Watt
A Factor = Cost of no load losses in Rs. /watt = Rs. 183.23 /Watt
B Factor = Cost of load losses in Rs. /watt = Rs. 101.33 /Watt
Evaluation criteria:
1. The tender bids will be evaluated on the basis of TOC (Total owning Cost) combined
for CRGO & Amorphous Core Transformer.
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2. Price evaluation will be calculated (i.e. L1, L2, L3, ___) on base of TOC (Total
owning Cost) and ranking will be given on the base of T.O.C. only.
3. Negotiation/Price matching will be carried out on the base of TOC only.
4. The bidder should guarantee individual No Load Losses and Full Load Losses at 75
Deg. C without any positive tolerance.
Sr.
No.
Rating of 22KV
Transformer in
KVA
No load losses
1
200 KVA
311
2312
2
500 KVA
730
4420
3
750 KVA
800
5600
4
1000 KVA
900
6200
in Watts (Max)
Amorphous/CRGO
Full load losses in Watts
(Max) At 75 Deg. c.
Amorphous/CRGO
1. Permissible band of minimum and maximum loss (Total load loss in watts at 100%
loading) level of Distribution Transformer is as under.
Non Star transformer (i.e. 200 KVA & 500KVA)
Sr.
No.
Rating of
22KV
Transformer
in KVA
1
* Total load loss in watts
at 100% loading should not
be lower than (Not equal
to)
* Total load loss in watts at
100% loading should not be
higher than (Not equal to)
200
2360
2623
2
500
4650
5150
3
750
5920
6400
4
1000
6560
7100
*Total load loss in watt at 100% loading = No load loss in watt + full load loss in watt
at 75 Deg. C.
If bidder is offering losses higher than upper limit of loss band should be out rightly
rejected. While bids of parties offering losses less than lowest limit of loss band,
difference in offered losses and lowest limit of loss band shall be added to no load
losses while calculating TOC and accordingly tender will be evaluated.”
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5.3.1. Percentage Impedance:
Voltage Ratio
kVA Rating
Percentage
Impedance
22000/433 - 250 V
200
4.75 %
22000/433 - 250 V
500
4.75 %
% impedance shall be subject to tolerance specified in IS: 2026 – 1977. Bids not
meeting the limits indicated above will be treated as non-responsive.
5.3.2 Temperature rise: The temperature rises over ambient shall not exceed the
limits described below:
Top oil temperature rise measured by thermometer
:
35 deg.C
Winding temperature rise measured by resistance
:
40 deg.C
Bids not meeting the above limits of temperature rise will be treated as non
responsive
5.4
PENALTY FOR NON PERFORMANCE:
5.4.1. During testing, if it is found that the actual measured losses are more than the
values quoted by the bidder, the purchaser will have right to exercise one of the
following options
a) Reject the complete lot
b) Penalty shall be recovered from the bidder for the excess losses as under
No load loss - @ Rs 395.00 per watt
Load Loss at 100%load - @79.00 per watt
5.4.2. Transformers with temperature rise and impedance beyond guaranteed values:
5.4.2.1. Purchaser reserves the right to reject the available lot of the transformer in
any sample of the transformer during the test at supplier’s works, if the
temperature rise exceeds the guaranteed values.
5.4.2.2 Purchaser reserves the right to reject any transformer during the test at
supplier’s works, if the impedance values differ from the guaranteed values
including tolerance.
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5.4.2.3 Purchaser also reserves the right to retain the rejected transformer and take it
into service until the Bidder replaces it with a new transformer at no extra cost.
The delivery as per contract will be counted when the new transformer as per
specification is provided by the manufacture.
5.5
INSULATION MATERIAL:
a) Material: Electrical grade insulation Kraft Paper of standard make or better
material subject to approval of the purchaser. Pressboard of standard make or
better material subject to approval of purchaser.
b) All spacers, axial wedges / runners used in windings shall be made of precompressed Pressboard−solid, conforming to type B 3.1 of IEC 641-3-2. In case of
cross-over coil winding of HV all spacers shall be properly sheared and dovetail
punched to ensure proper locking. All axial wedges / runners shall be properly
milled to dovetail shape so that they pass through the designed spacers freely.
Insulation shearing, cutting, milling and punching operations shall be carried out
in such a way, that there should not be any burr and dimensional variations.
5.6
TANK:
The transformer tank can be with radiator fins.
FOR RECTANGULAR PLAIN TANK:
i.
The transformer tank shall be of robust construction rectangular in shape and
shall be built up of tested MS sheets.
The tank shall be made of prime quality MS sheet of thickness stated below with
necessary stiffener to withstand the pressure built in during the expansion of oil
due to temperature rise
Voltage
Rating
Minimum thickness of plate in mm
For sides
For Top & Bottom
11KV/22KV
200 KVA
3.15
5
11KV
500 KVA
4.50
5
22KV
500 KVA
4.50
6
Thickness of plate shall be subject to tolerance specified in IS: 1852 –1985.
The exterior of the transformer tank and other ferrous fitting shall be thoroughly
cleaned , scraped /sand blasted and given a priming coat and two finishing coats of
durable oil and weather resistant paint of light admiralty grey conforming to colour
code No. 632 of IS-5 of 1961.
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ii.
The internal clearance of tank shall be such that, it shall facilitate easy lifting of
core with coils from the tank without dismantling LV bushings.
iii.
All joints of tank and fittings shall be oil tight and no bulging should occur during
service. The tank design shall be such that the core and windings can be lifted
freely. The tank plate shall be of such strength that the complete transformers
when filled with oil may be lifted bodily by means of lifting lugs. Inside of tank
shall be painted with varnish / Hot oil.
iv.
Manufacturer should carry out all welding operations as per the relevant ASME
standards and submit a copy of the welding procedure qualifications and welder
performance qualification certificates to the customer.
v.
The four walls of the tank shall be made of two “L” shaped sheets or one sheet
“Π“ shaped and one straight (without joints) fully welded at the only two
corners from inside and outside of the tank for withstanding a pressure of 0.8
kg/cm2 for 10 minutes.
Top cover plate shall be slightly slopping approx. 10mm towards HV bushing and
ends of cover plate shall be bent to 90• downwards so as to avoid entry of
water through the cover plate gasket.
vi.
The tank shall be reinforced by welded angle on all the outside walls on the edge
of the tank to form two equal compartments. Permanent deflection when the
tank without oil is subject to a vacuum of 525 mm of mercury for rectangular
tank and 760 mm of mercury for round tank, shall not be more than 5 mm up to
750 mm length and 6 mm up to 1250 mm length. The tank shall further be
capable of withstanding a pressure of 0.8 kg/sq.cm (g) and a vacuum of 0.3
kg/sq.cm (g) without any deformation.
vii.
The radiators can be tube type or fin type or pressed steel type to achieve the
desired cooling to limit the specified temperature rise. The transformer shall be
capable of giving continuous rated output without exceeding the specified
temperature rise. Bidder shall submit the calculation sheet.
Lifting lugs: 4 Nos. welded heavy duty lifting lugs of MS plate 8 mm thick (min)
suitably reinforced by vertical supporting flat welded edgewise below the lug on
the side wall.
Pulling lugs: 4 Nos. of welded heavy duty pulling lugs of MS plate 8 mm thick
(min) shall be provided to pull the transformer horizontally.
Top cover fixing bolts of G.I adequately spaced and 6 mm Neoprene bonded cork
gaskets conforming to IS 4253 part-II shall be placed between tank and cover.
The bolts outside tank shall have 2 flat washers & one spring washer.
viii.
ix.
x.
5.6.8. CONSERVATOR
On Transformers of all ratings with rectangular plain tank the provision of
conservators is obligatory.
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When a conservator is provided, oil gauge and the plain or dehydrating
breathing devise shall be fixed to the conservator which shall also be provided
with a drain plug and a filling hole (1¼" normal size thread) with cover. The
capacity of a conservator tank shall be designed to contain 10% of the total
quantity of oil and its contraction and expansion due to temperature variations.
Normally 3% quality of total oil will be contained in the conservator. In
addition the cover of main tank shall be provided with an air release plug to
enable air trapped within to be released, unless the conservator is so located as
to eliminate the possibility of air being trapped within the main tank.
The inside diameter of the pipe connecting the conservator to the main tank
should be within 30 to 50 mm and it should be projected into the conservator
so that its end is approximately 20 mm above the bottom of the conservator so
as to create a sump for collection of impurities. The minimum oil level
(corresponding to -5 deg C) should be above the sump level.
5.6.9. BREATHER:
Breather shall be screwed type. It shall have die cast aluminum body & further,
inside container for silica gel shall be of tin sheet, Volume of Silica gel breather
shall be 0.5 Kg. The make and design of breather shall be subject to approval of
DGVCL. Inverted U-shape pipe shall be used for connection of breather.
5.7
SURFACE PREPARATION & PAINTING
5.7.1. GENERAL:
5.7.1.1 All paints shall be applied in accordance with the paint manufacturer’s
recommendations. Particular attention shall be paid to the following:
a)
Proper storage to avoid exposure as well as extremes of temperature.
b)
Surface preparation prior to painting.
c)
Mixing and thinning
d) Application of paints and the recommended limit on time intervals between
coats.
e)
Shelf life for storage
5.7.1.2 All paints, when applied in a normal full coat, shall be free from runs, sags,
wrinkles, patchiness, brush marks or other defects.
5.7.1.3 All primers shall be well marked into the surface, particularly in areas where
painting is evident, and the first priming coat shall be applied as soon as possible
after cleaning. The paint shall be applied by airless spray according to
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manufacturer’s recommendations. However, where ever airless spray is not
possible, conventional spray be used with prior approval of purchaser.
5.7.1.4 The Supplier shall, prior to painting protect nameplates, lettering gauges, sight
glasses, light fittings and similar such items.
5.7.2. CLEANING AND SURFACE PREPARATION:
5.7.2.1 After all machining, forming and welding has been completed, all steel work
surfaces shall be thoroughly cleaned of rust, scale, welding slag or spatter and
other contamination prior to any painting.
5.7.2.2 Steel surfaces shall be prepared by Shot blast cleaning or chemical cleaning by
Seven Tank process including Phosphating to the appropriate quality.
5.7.2.3 The pressure and volume of the compressed air supply for blast cleaning shall
meet the work requirements and shall be sufficiently free from all water
contamination to ensure that the cleaning process is not impaired.
5.7.2.4 Chipping, scraping and steel wire brushing using manual or power driven tools
cannot remove firmly adherent mill-scale shall only be used where blast cleaning
is impractical. Manufacturer to explain such areas in his technical offer clearly.
5.7.3. PROTECTIVE COATING:
5.7.3.1 As soon as all items have been cleaned and within four hours of the subsequent
drying, they shall be given suitable anti-corrosion protection.
5.7.4. PAINT MATERIAL:
Followings are the types of paint that may be suitably used for the items to be
painted at shop and supply of matching paint to site:
5.7.4.1 Heat resistant paint (Hot oil proof) for inside surface.
5.7.4.2 For external surfaces one coat of Thermo Setting Powder paint or 1 coats of
Zinc chromate primer followed by 2 coats of Synthetic Enamel / Polyurethene
base Paint These paints can be either air drying or stoving.
5.7.4.3 The color of the finishing coats shall be dark admiral gray conforming to No. 632
of IS-5 of 1961.
5.7.5. PAINTING PROCEDURE:
5.7.5.1 All painting shall be carried out in conformity with both Specification and with
the paint manufacturer’s recommendation. All paints in any one particular
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system, whether shop or site applied, shall originate from one paint
manufacturer.
5.7.5.2 Particular attention shall be paid to the manufacturer’s instructions on storage,
mixing, thinning and pot life. The paint shall only be applied in the manner
detailed by the manufacturer e.g. brush, roller, conventional or airless spray and
shall be applied under the manufacturer’s recommended condition. Minimum
and maximum time intervals between coats shall be closely followed.
5.7.5.3 All prepared steel surfaces should be primed before visible re-rusting occurs or
within 4 hours, whichever is sooner.
Chemical treated steel surfaces shall be primed as soon as the surface is dry and
while the surface is still warm.
5.7.5.4 Where the quality of film is impaired by excess film thickness (wrinkling, mud
cracking or general softness) the Supplier shall remove the unsatisfactory paint
coating and apply another. As a general rule, dry film thickness should not
exceed the specified minimum dry film thickens by more than 25%. In all
instances where two or more coats of the same paint are specified, such coatings
may or may not be of contrasting colours.
5.7.5.5 Paint applied to items that are not be painted shall be removed at Supplier’s
expense, leaving the surface clean, unstained and undamaged.
5.7.6. DAMAGED PAINTWORK:
5.7.6.1 Any damage occurring to any part of a painting scheme shall be made good to
the same standard of corrosion protection and appearance as that originally
employed.
5.7.6.2 Any damaged paint work shall be made good as follows:
a) The damaged area, together with an area extending 25 mm
boundary, shall be cleaned down to bare metal.
around its
b) A priming coat shall be immediately applied, followed by a full paint finish
equal to that originally applied and extending 50 mm around the perimeter of
the original damage.
c) The repainted surface shall present a smooth surface. This shall be obtained
by carefully chamfering the paint edges before and after priming.
5.7.7. DRY FILM THICKNESS:
5.7.7.1 To the maximum extent practicable the coats shall be applied as a continuous
film of uniform thickness and free of pores. Overspray, skips, runs, sags and
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drips should be avoided. The different coats may or may not be of the same
colour.
5.7.7.2 Each coat of paint shall be allowed to harden before the next is applied as per
manufacturer’s recommendation.
5.7.7.3 Particular attention must be paid to full film thickness at edges.
5.7.7.4 The requirements for the dry film thickness (DFT) of paint and the materials to
be used shall be as given below.
Sl.
No.
Paint Type
1.
Thermo setting paint.
Area to be
painted
No. of
coats
Total Dry film
thickness (min.)
inside
01
20 microns
outside
01
60 microns
outside
01
30 microns
outside
02
25 microns each
inside
01
35 / 10 microns
Liquid paint
a) Zinc chromate
(primer)
2.
b) Synthetic Enamel /
Poly Urethene
(Finish coat)
c) Hot oil paint /
Varnish
5.7.8. TESTS:
5.7.8.1 The painted surface shall be tested for paint thickness.
5.7.8.2 The painted surface shall pass the Cross Hatch Adhesion test, Salt spray test and
Hardness test as per the relevant ASTM standards.
NOTE: Supplier shall guarantee the painting performance requirement for a
period of not less than 5 years.
5.8.
BUSHINGS:
5.8.1 The H.V, LV porcelain bushing and metal parts shall be as per
following IS
1) IS 5621/1980 - hollow insulators.
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2) IS 7421/1988 - Porcelain transformer bushing up to 11KV.
3) IS 2099/1986 - Bushing for A.C voltage above 1kv.
4) IS 3347/1988 - porcelain transformer bushing.
The metal parts shall be made from drawn or rolled quality tinned brass or
electroplated.
The arrangement of bushing at top plate will only be acceptable HV bushings are to be
installed on turret, flange and gaskets to prevent eventual entry of water.
Bushings having type tested as per IS 3347 and approved by the Board which are given as
under shall only be acceptable.
For L.V. side bushing
“In L.V. side bushing, turret of minimum 10mm should be provided.”
For H.V. side bushing
“HT bushing should be kept in such a way that minimum air clearance should be
maintained by tilting the same.”
11KV H.V. BUSHINGS:
1) M/s BEPCO
2) M/s JAYASHREE
3) M/s W.S. INSULATORS
4) M/s ASSOCIATED PORCELAIN (only 11kv)
5) M/s SESHASAYEE
6) M/s JAIPUR GLASS
7) M/s B.P.P.L Bikaner
8) M/s LUSTER CERAMICS
9) M/s Agrawal salt co. Bikaner
10) M/s Venketeshwara ceramics (11kv only)
11) M/s CJI Porcelain India Ltd.
12) M/s Maxwell Ceramic, Wadhwan (Only 11KV)
13) M/s RAVIKIRAN ((only 11KV)
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14) M/s Vishal malleble ltd. Ankleshwar.
L.V. BUSHINGS:
1) M/S J.S.I. (RISHRA).
2) M/s Luster Ceramics.
3) M/s Jaipur Glass.
4) M/s B.P.P.L Bikaner.
5) M/s Agrawal salt co,Bikaner.
6) M/s Venkateshwara ceramics.
7) M/s CJI Porcelain India Ltd
8) M/s Maxwell Ceramic, Wadhwan
9) M/s Ravi Kiran
10) M/s Vishal Malleble Ltd., Ankleshwar
Note: Embossing showing the Manufacturer’s name should be clearly
after fixing the same on Transformer.
visible, even
5.8.2 The bi-metallic connectors shall have to be fitted on HV/LV terminals
having capacity of double the size of rated HV/LV current of transformer.
5.8.3 INTERNAL CONNECTION
(a) HV winding:
i) In case of HV winding all jumpers from winding to bushing shall have
cross section larger than winding conductor.
ii) Inter coil connection shall be done by brazing.
iii) In case of AL/CU winding Delta joint shall be with brazing only.
iv) Lead from Delta joint shall be connected to bushing rod by brazing only.
(b) LV Winding:
LV star point shall be formed of AL/CU flat of sufficient size and length. Lead from
winding shall be connected to the flat by brazing. Firm connection of LV winding to
bushing shall be made of adequate size of “L” shape flat. Connection of LV coil lead
to “L” shape flat shall be made by brazing. The "L" Shape flat shall be of copper for
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copper winding & Alluminium of Alluminium winding. “L” shape flat/lug shall be
clamped to LV bushing metal part by using nut, locknut and washer.
5.9. TANK BASE CHANNEL:
For numbers of plain bi-directional rollers with cross channels for platform
mounting.
5.10. TERMINAL MARKINGS:
(i)
High voltage and Low voltage phase windings shall be marked both in the
terminal boards inside the tank and on the outside with capital letter 1U, 1V, 1W
and low voltage winding for the same phase marked by corresponding small
letter 2u, 2v, 2w. The neutral point terminal shall be indicated by the letter 2n.
Neutral terminal to be brought out and connected to local grounding terminal by
an Earthing strip.
(ii)
Marking of DGVCL and Sr. no. of transformer will be engraved in addition to
above on top cover near lifting lug towards Neutral side.
(iii)
The name of the company, order no., capacity, month and year of manufacturing
DGVCL, Sr.No. shall be engraved on tank of transformer just below the name
plate clearly visible. The engraving can be done on separate plate which shall be
firmly welded to main tank and shall form integral part of the tank.
5.11
FITTINGS:
The following standard fittings shall be provided.
a) Two earthing terminal (stud and bolts should be properly galvanized and
confirm to IS:1363/1967 and IS:1367/1961 and latest amendment thereof.
b) Two lifting lugs to lift core assembly.
c) Two lifting lugs to lift complete transformer
d) Crimping type cable sockets for 500 KVA transformers with suitable G.I. bolts
and nuts and washer to fix the same to LV terminals.
e) Rating and terminal marking plates.
f) Unidirectional flat rollers.
g) Conservator tank shall have inter connection pipes projections, 20 mm above
bottom of conservator to eject from sump for collection of impurities and
shall be fixed between conservator and rain tank and also having 30 mm. dia
drain valve, oil filling hole with cap on the top of the conservator.
h) Oil level gauge with toughened glass with minimum marking.
i) Thermometer pocket in according to ISS: 3580.
j) De-hydrating breather.
k) Air release plug on the transformer tank to release tapped air inside the tank
when filling oil through conservator.
l) One drain cum sampling valve.
m) One filter valve on the supper top side of the tank
n) Lifting lugs for tank cover.
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o) Inspection hole for 500 KVA
5.12 FASTENERS:
All bolts, studs, screw threads, pipe threads, bolt heads and nuts shall comply with the
appropriate Indian Standards for metric threads, or the technical equivalent.
Bolts or studs shall not be less than 6 mm in diameter except when used for small wiring
terminals.
All nuts and pins shall be adequately locked.
Wherever possible bolts shall be fitted in such a manner that in the event of failure of
locking resulting in the nuts working loose and falling off, the bolt will remain in
position.
All ferrous bolts, nuts and washers placed in outdoor positions shall be treated to
prevent corrosion, by hot dip galvanising, except high tensile steel bolts and spring
washers which shall be electro-galvanised/ plated. Appropriate precautions shall be
taken to prevent electrolytic action between dissimilar metals.
Each bolt or stud shall project at least one thread but not more than three threads
through the nut, except when otherwise approved for terminal board studs or relay
stems. If bolts nuts are placed so that they are inaccessible by means of ordinary
spanners, special spanners shall be provided.
The length of the screwed portion of the bolts shall be such that no screw thread may
form part of a shear plane between members.
Taper washers shall be provided where necessary.
Protective washers of suitable material shall be provided front and back or the securing
screws.
5.13. MOUNTING ARRANGEMENT:
For numbers of plain bi-directional rollers with cross channels for platform mounting.
5.14. OVERLOAD CAPACITY:
The transformers shall be suitable for loading as per IS: 6600 / 1972
5.14.1 THE INSPECTION OF PROTO TYPE TRANSFORMER.
The Manufacturer shall have to offer one no of prototype transformer for along with
relevant drawing as stated in tender specification clause 15 for approval of DGVCL
before offering first lot.
The proto type shall be subjected to following test.
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1) Verification of CRGO/Amorphous laminations material documents and
quality.
2) Verification of internal parameters with respect to drawing and GTP.
3) All Routine tests/ acceptance test as per clause 6.1 & 6.4
4) Temperature rise test as per clause no.6.2 (1)
5) Verification of Air pressure test certificate from manufacturer of tank.
6) Unbalanced current test.
The manufacturer has to submit the following details along with offer of prototype
transformers
i)
G.A. Drawing.
ii)
Internal Construction Drawing.
iii)
Name plate drawing
iv)
Technical Details Sheet.
v)
HT/LV Bi metallic connectors.
vi)
Drain cum sampling Valve Drawing.
vii)
Drawing for month & year of manufacture to be written on
conservator tank & body.
Viii)
ix)
Core details drawing
Short circuit capacity calculation sheet
x)
Cooling capacity calculation
xi)
Technical details as per DGVCL ‘s Prescribed Performa for design &
constructional details
The above drawings are illustrative. However, the bidder may submit their own
drawing if they so desires. However, offer without drawings shall not be
considered Also each pages of technical bid & price bid shall be provided with
seal of manufacturer & duly signed.
5.14.2 GUARANTEE FOR THE TRANSFORMERS:
1)
Guarantee period shall be 60 months from the date of installation or 66 months
from the date of receipt by purchaser whichever is earlier. If any transformer
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fails during this guarantee period, the supplier shall repair the same at his cost
at his works.
2)
The supplier situated outside Gujarat State shall have to establish suitable and
adequate arrangement for repairing and testing of failed transformer in Gujarat
State at his cost. This arrangement shall have to be continued up to the
completion date of guarantee period of supply of last lot.
3)
After intimation of failure of transformer failed within guarantee period, DGVCL
will arrange for the dispatch of guarantee period failed transformer to firm’s
works at the cost of DGVCL. On receipt of guarantee period failed transformer at
firm’s works, the external inspection will be carried out by the representative of
DGVCL not below the rank of Junior Engineer. The cost of any outer component
damage not because of supplier’s fault and required to be provided will be
reimbursed to the supplier as per the approved rate of DGVCL on the strength of
joint external inspection report. No. internal inspection of failed unit is to be
carried out in presence of representative of DGVCL. However, the supplier may
prepare an internal inspection report of failed unit for his study and analysis. If
required, such analysis shall be furnished to DGVCL.
After joint inspection, the failed transformer shall be repaired within one month
and the repaired unit duly tested shall be dispatched by supplier at his cost to
the concerned consignee from where the failed unit was received along with the
test report. If the transformer is not repaired and delivered back or dispatched
without complete test report within this period, than the cost of GP failed
transformer shall be recovered from the supplier’s pending / ensuing bill against
the order or any other of order. In case, the supplier does not have further
order, the cost of GP failed transformers shall be recovered from the Bank
Guarantee furnished. Testing of transformer will be done in presence of Board’s
Engineer to ensure no change in losses as per GTP after repair. Transformer
found with higher losses than GTP will not be accepted and cost thereof will be
recovered.
6.0.
TESTS:
a) All the equipment offered shall be fully type tested by the bidder or his
collaborator as per the relevant standards including the additional type tests
mentioned at clause 6.2. The type test must have been conducted on a
transformer of same design. The Bidder shall furnish four sets of type test
reports along with the offer. Offers without type test reports will be treated as
Non-responsive.
b) Special tests other than type and routine tests, as agreed between purchaser
and Bidder shall also be carried out as per the relevant standards.
c) The requirements of site tests are also given in this clause.
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d) The test certificates for all routine and type tests for the transformers and
also for the bushings and transformer oil shall be submitted with the bid.
6.1.
ROUTINE TESTS:
1.
Ratio, polarity and phase sequence.
2.
No Load current and losses at service voltage and formal frequency
3.
Load losses at rated current and normal frequency
4.
Impedance Voltage test
5.
6.
Resistance of windings at each tap, cold (at or near the test bed temp.)
Insulation resistance
7.
Induced over voltage withstand test.
8.
Separate source voltage withstand test.
9.
10.
11.
Neutral current measurement
Oil samples (one sample per lot) to comply with IS 1866.
Measurement of no load losses and magnetizing current at rated
frequency and 90%, 100% and 110% voltage.
CT parameter tests as per relevant IS (if provided)
12.
6.2
TYPE TESTS TO BE CONDUCTED ON ONE UNIT:
In addition to the Tests mentioned in para 6.1 following Tests shall be
conducted.
1. Temperature rise test for determining the maximum temperature rise after
continuous full load run. The ambient temperature and time of test should be
stated in the test certificate.
2. Impulse voltage test:
As per IS - 2026 part-III latest version. BIL for:
(a) 11 kV shall be 95 kV Peak instead of 75 kV
(b) 22 KV shall be 150 KV Peak.
3. Air Pressure Test: As per C1.22.5 of IS - 1180 / part-I/1989
4. Short Circuit withstand test: Thermal and dynamic ability.
5. Magnetic Balance Test
6.
Noise-level measurement
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7.
Measurement of zero-phase sequence impedance.
8.
Measurement of Harmonics of no-load current
9.
Pressure relief device test ( if provided)
10. Transformer tank shall be subjected to specified vacuum. The tank designed
for vacuum shall be tested at an internal pressure of 0.35 kg. Per sq.cm.
absolute (250 mm of Hg) for one hour. The permanent deflection of flat
plates after the vacuum has been released shall not exceed the values
specified below:
Horizontal length of flat plate (in mm)
Permanent deflection (in mm)
Upton & including 750
5.0
751 to 1250
6.5
1251 to 1750
8.0
1751 to 2000
9.5
2001 to 2250
11.0
2251 to 2500
12.0
2501 to 3000
16.0
Above 3000
19.0
11. Transformer tank together with its radiator and other fittings shall be
subjected to pressure corresponding to twice the normal pressure or 0.35 kg
/sq.cm. whichever is lower, measured at the base of the tank and
maintained for an hour. The permanent deflection of the flat plates after
the excess pressure has been released, shall not exceed the figures for
vacuum test.
12. The pressure relief device shall be subject to increasing fluid pressure. It
shall operate before reaching the test pressure as specified in the above
class. The operating pressure shall be recorded. The device shall seal-off
after the excess pressure has been released.
Type test certificates for the tests carried out on prototype of same
specifications shall be submitted along with the bid.
The purchaser may select the transformer for type tests randomly.
6.3.
TESTS AT SITE: The purchaser reserves the right to conduct all tests on
Transformer after arrival at site and the manufacturer shall guarantee test
certificate figures under actual service conditions.
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In order to ensure quality the acceptance test shall be carried out even
after installation of transformer within grantee period. If acceptance test
standards are not met during such field test, 5% penalty may be imposed on
all transformers supplied as per that proto type design.
6.4.
ACCEPTANCE TESTS:
The transformers shall be subjected to the following routine/ acceptance test in
presence of purchaser’s representative at the place of manufacture before
despatch without any extra charges. The testing shall be carried out in
accordance with IS:1180 and IS:2026.
1.
Checking of weights, dimensions, fitting and accessories, tank sheet
thickness, oil quality, material, finish and workmanship as per GTP /
QA Plan and contract drawings.
2.
Physical verification of core coil assembly and measurement of flux
density of one unit of each rating, in every inspection with reference to
short circuit test report
4. All tests as specified in clause 6.1
6.5
Inspection & testing of transformer Oil:
The transformer oil to be filled shall be I.S.I. marked confirming to REC
Specification 39/1985 (R-1993) and I.S. 335/1993 with latest amendments.
The firm has to make arrangement for testing of transformer oil sample taken
out from the manufactured transformer in an independent laboratory in
presence of DGVCL representative if required.
To ascertain the quality of the transformer oil the original manufacturers’ test
report shall be submitted at the time of inspection.
The sample of transformer oil filled in prototype will be sent by firm to ERDA for
testing as per I.A.S. 1866/1993 with amendment No. 1/1987 latest amendment
applicable at the time of testing.
During testing of oil sample at ERDA, if the same passes than only testing charges
shall be reimbursed by DGVCL. If it fails then charges will not be reimbursed by
DGVCL. Further after replacement/filtering of oil, second oil sample shall be
drawn from same transformer at the request of firm in the presence of DGVCL
engineer and shall be tested at ERDA at the cost of firm. The testing shall also be
witnessed by DGVCL engineer if required. In case of failure of second sample,
the prototype transformer shall be rejected and only after a modification or
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refilling with proper quality of oil, the same shall be offered by the firm. Any
delay on this will be on account of firm.
For bulk supply also similar procedure for oil testing shall be followed, however,
the sampling rate of sample shall be 1 number of transformers out of 100
numbers or part thereof for the ordered quantity including repeat order if any.
In case of failure of first oil sample, second oil sample from same/another
transformer in the same offered lot, shall be drawn by firm in presence of
Inspector of DGVCL at the request of firm after filtration/replacement of oil
from all transformers of offered lot and same shall be tested at ERDA at the cost
of firm.
The cost of deputing DGVCL Inspector for drawing the second oil sample at firm’s
works shall be reimbursed by firm of DGVCL.
In the event of failure of second oil sample, the whole lot offered from which
sample have been drawn and failed will be rejected.
The supplier shall maintain the register for the oil consumption and for this they
have to show the challan or bill of the supplier of oil. The Inspector of DGVCL
shall verify the record as well the quantity physically available in the factory at
the time of drawing the oil samples and shall put his signature in the register.
6.6
TOLERANCES:
Unless otherwise specified herein the test value of the transformers supplied
would be within the tolerance permitted in the relevant standards. No positive
tolerance is allowed on guaranteed No Load and Load losses.
7.0.
INSPECTION:
All tests and inspection shall be made at the place of manufacturer and unless
other wise especially agreed upon the manufacturer and the purchaser at the
time of purchase. The manufacturer shall afford the inspector representing the
purchaser all reasonable facilities, without charge to satisfy him that the
material is being furnished in accordance with specification.
The manufacturer shall provide all services to establish and maintain quality of
workman ship in his works and that of his sub-contractors to ensure the
mechanical / electrical performance of components, compliance with drawings,
identification and acceptability of all materials, parts and equipment as per
latest quality standards of ISO 9000.
Along with the bid the manufacturer shall prepare Quality Assurance Plan
identifying the various stages of manufacture, quality checks performed at each
stage and the Customer hold points. The document shall also furnish details of
method of checking, inspection and acceptance standards / values and get the
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approval of purchaser or his representative before proceeding with
manufacturing. However, purchaser or his representative shall have the right to
review the inspection reports, quality checks and results of manufacturer’s in
house inspection department which are not customer hold points and the
manufacturer shall comply with the remarks made by purchaser or his
representative on such reviews with regards to further testing, rectification or
rejection etc. Manufacturer should submit the list of equipment for testing
along with latest calibration certificates to the purchaser.
Purchaser shall have every right to appoint a third party inspection to carryout
the inspection process. The purchaser has the right to have the test carried out
at his own cost by an independent agency wherever the dispute regarding the
quality of supply. Purchaser has right to test 1% of the supply selected either
from the stores or field to check the quality of the product. In case of any
deviation purchaser have every right to reject the entire lot or penalize the
manufacturer, which may leads to blacklisting among other things.
8.0.
QUALITY ASSURANCE PLAN:
8.1.
The Bidder shall invariably furnish following information along with his bid,
failing which his bid shall be liable for rejection. Information shall be separately
given for individual type of equipment offered.
i) Statement giving list of important raw materials, names of sub- suppliers for
the raw materials, list of standards according to which the raw materials are
tested. List of tests normally carried out on raw materials in the presence
of Bidder’s representative, copies of test certificates.
ii) Information and copies of test certificates as in (I) above in respect of
bought out accessories.
iii) List of manufacturing facilities available.
iv) Level of automation achieved and list of areas where manual processing
exists.
v) List of areas in manufacturing process, where stage inspections are
normally carried out for quality
control and details of such tests and
inspection.
vi) List of testing equipment available with the bidder for final testing of
equipment along with valid calibration reports shall be furnished with the
bid. Manufacturer shall posses 0.1 class instruments for measurement of
losses.
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vii)
8.2
Quality Assurance Plan
inspection as per Annexure.
(QAP)
with
hold
points
for
purchaser’s
The successful Bidder shall within 30 days of placement of order, submit
following information to the purchaser.
i)
List of raw materials as well as bought out accessories and the names
of sub-suppliers selected from those furnished along with offer.
ii)
Type test certificates of the raw materials and bought out accessories.
8.3
The successful Bidder shall submit the routine test certificates of bought out
accessories and central excise passes for raw material at the time of routine
testing.
9.0.
DOCUMENTATION:
The Bidder shall furnish along with the bid the dimensional drawings of the
items offered indicating all the fittings.
10.0
i)
Dimensional tolerances
ii)
weight of individual components and total weight
PACKING & FORWARDING:
10.1 The packing shall be done as per the manufacturer’s standard practice.
However, it should be ensured that the packing is such that, the material would not get
damaged during transit by Rail / Road / Sea.
10.2
11.0
The making on each package shall be as per the relevant IS.
MANADATORY SPARES:
Mandatory spares shall be supplied as per the purchaser’s requirement.
12.0 CHALLANGE TESTING:
The other manufacturer can also request challenge testing for any test based on
specification and losses. The challenger would request for testing with testing fee.
The challenge test fees are proposed at least three time the cost of testing .This
is likely to deter un necessary challenges. The challenger would have the
opportunity to select the sample from the store and any such challenge should be
made within the guaranty period. The party challenged, challenger and the utility
could witness the challenged testing.
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The challenged testing would cover the 1) Measurement of magnetizing current.
2) No load losses test. 3) Load losses test (at 50% loading or as per acceptance
test). 4) Temperature rise test.
The challenge test could be conducted at NABL accredited laboratory, like ERDA
and CPRI Bhopal. If the values are within limit the product gets confirmed else not
confirmed. No positive tolerance in losses be permitted. If the product is not
confirmed the manufacturer would pay the challenge fee and challenger would get
the fee refunded. However as a redressal system the challenger would be allowed
to ask for fresh testing of two more samples from the store and the same be tested
in NABL laboratory in presence of party challenged, challenger and the utility. If
any one or both sample does not confirm the test then the product is said to have
failed the test. In such cases the manufacturer will be declared as un successful
manufacturer for the said product with wide publicity and would not be allowed to
compete in
tenders of the Board for the period of three years and heavy
penalty would be imposed.
13.0. DRAWINGS:
One copy of the dimensional drawing and internal construction drawing of each
ratting transformer shall be submitted with the tender. These drawings shall be
of A-3(420 x 297 mm) size only. Format and pattern of the drawings shall be as
per specimen drawing attached with the tender specification. Guaranteed and
other technical particulars of the transformers as per the A/T shall also be
submitted in A-4 size for our approval. In the Performa attached with tender
only.
14.0 GTP- GUARANTEED AND OTHER PARTICULARS FOR TRANSFORMERS:
To be filled in and submitted by the tenderer in the Performa attached with the tender.
15.0 . SCHEDULE:
15.1 The tenderer shall fill in the following Schedules which from part of the tender
specification and offer. In schedule ‘A’ the specific values shall be furnished and
only quoting of IS reference is not sufficient. If the schedule are not submitted
duly filled in with the offer, the offer shall be liable for rejection.
Schedule ‘A’
Guaranteed Technical Particulars (Annexure- I,II &
III).
Schedule ‘B’
Schedule of Deviations from Specification.
Schedule ‘C’
Schedule of Tenderer’s Experience.
Schedule ‘D’
Schedule of Deviation from specified standards.
Schedule ‘E’
Schedule of Deviations from specified Test requirements.
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15.2. All deviations from the specifications shall be brought out in the schedules of
deviation (Schedules ‘B’,’D’ & ‘E’). The discrepancies between the specification
and the catalogues, literatures and indicative drawings which are subject to
change, submitted as part of the offer, shall not be considered and
representation in this regard will not be entertained. If it is observed that there
are deviations in the offer in G.T.P. of elsewhere other than those specified in
the deviation schedule ‘B’ then such deviations shall be treated as deviations.
15.3.
For any deviation from the specification, which is not specifically brought out in
the schedule of deviations, the offer may be liable for rejection. The deviation
brought out in the schedule shall be supported by authentic documents,
standards and clarifications; otherwise the offer may be liable for rejection.
15.4. The tenderer shall submit the list of orders for similar type of equipments,
executed of under execution during the last three years, with full details in the
schedule of Tender’s experience (Schedule ‘C’) to enable the purchaser to
evaluate the tender.
15.0 TENDER DRAWINGS TO BE ENCLOSED:
i) G.A. Drawing.
ii) Internal Construction Drawing.
iii) Name plate drawing
iv) Technical Details Sheet.
v) HT/LV Bimetallic connectors.
vi) Drain cum sampling Valve Drawing.
vii) Drawing for month & year to be written on conservator tank & body.
Viii) Core details drawing
ix) Short circuit capacity calculation sheet
x) Cooling capacity calculation
The above drawings are illustrative. However, the tenderer may submit their own
drawing if they so desires. The bidder shall submit above details along with offer as well
as before offering the prototype transformer.
16.0
AUDIT INSPECTION:
After inspection of ordered transformer by the User Department Inspector, field
engineer may pick up samples from the lots supplied at RSOs/ or other stores of the
Company or from the works of party, for quality check at random. The samples picked
up will be tested for Acceptance Test / Type Tests or the tests as decided by Company,
at Government approved laboratory, in presence of representatives of supplier and
DGVCL, as per relevant ISS/BIS/DGVCL Specification and GTP, as under:
(i)
One number of each rating of transformer shall be picked up at random by field
engineer from RSO’s / or other stores of the Company or from the works of party
and will be tested for Acceptance Tests & Temperature Rise Test.
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(ii)
One number of each rating of transformer sealed at party’s works by field
engineer will be tested for (a) Impulse Test (b) Short Circuit Test (c) other Type
Tests(if decided by the Company).
As regard bearing test charges,
(i)
For transformers picked up for testing from RSOs/ or other stores of the
Company or from the works of party,
DGVCL will bear total expenses.
However, for witnessing the tests, supplier shall have to bear their own
expenses.
(ii)
For transformers sealed at party’s works for Type Tests, if sample passes in all
tests, DGVCL will bear only testing charges.
However, if sample fails in any of the tests, cost of testing charges including
transportation, loading unloading etc. will have to be paid by supplier. Alternatively, it
will be recovered from supplier’s bills.
In case, if the materials do not confirm to specifications or fails at Government
approved laboratory or other laboratory decided by the Company for testing and if
subsequent testings are to be carried out (which will solely at Company’s discretion), all
Testing fees, expenses of the inspector & other expenses incurred by the Company will
be to successful tenderer’s account. For acceptance as above, the decision of the
Company shall be final & will be binding to successful tenderer.
The test results will be binding on the suppliers. Company in general will not allow resampling. If the material fails in any of the acceptance tests carried out (except for no
load and load losses), the materials supplied till date will be considered as rejected and
if replacement is not possible due to consumption of the materials, Company will
deduct penalty @ 1% of the end cost prices of all transformers supplied till date of
receipt of failure report. If the same are not utilized / consumed, Company at sole
discretion may ask for replacement or may accept the material with penalty as above.
For failure in No Load and or Load Losses, transformers supplied till date of receipt of
failure report shall be rejected or penalty @ Rs.395.00 per watt for No Load Losses and
penalty @ Rs.79.00 per watt for Load Losses for the transformers supplied till date of
receipt of failure report shall be charged. The decision of the Company will be binding
on the successful tenderer.
In the event of transformer failing during any of the type tests (temperature rise test is
part of type test), following recovery shall be made.
Recovery, equivalent to 1% of end cost of particular rating transformers supplied against
the order till receipt of test reports.
Further in case, any transformer taken for type testing, fails either in short circuit test
or impulse test or temp. rise test, or other type tests (if decided by the Company),
supplier will be allowed for modification in their design and other technical parameters.
In that case, supplier will have to obtain prior approval from DGVCL for such proposed
changes / modifications desired to be effected, by submitting revised drawings and
other technical details, clearly indicating the changes proposed to be made, compared
to previous design.
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In case, if transformers shall fail in testing and same are rejected or accepted with
penalty, Company shall pick up another transformer for Acceptance Tests / Type Tests
(as the case may be) of same rating from replaced and or subsequently supplied lots for
testing to have verification of the quality of other transformers supplied.
In case of any dispute for testing, the Company’s decision will be final and binding to
the supplier. If supplier will not agree to accept the Company’s decision, the order for
balance quantity will be cancelled without any clarification and material will be
purchased by the Company at risk and cost of the supplier.
The minimum lot to be offered for inspection shall be as under:
i)
ii)
At least 33% of each rating or as mentioned in delivery schedule of the order,
whichever is less, for the ordered quantity up to100 Nos.
Minimum 50 Nos. of each rating or as mentioned in delivery schedule of the
order, whichever is less, for the ordered quantity above 100 Nos.
SEAL & SIGNATURE OF THE TENDERER
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SCHEDULE -A
ANNEXURE-I
GUARANTEED & OTHER PARTICULARS FOR DISTRIBUTION TRANSFORMERS
(To be furnished by the Manufacturer)
Sr
Description
1.
Make & Manufacturer
2.
Place of Manufacture
3.
Voltage Ratio
4.
Rating in kVA
5.
Core Material used and Grade
500 kVA
750KVA
1000KVA
22000/433
V
22000/43
3V
22000/43
3V
500 kVA
750KVA
1000KVA
a) Flux density
b) Over fluxing without
saturation (Curve to be furnished
by the Manufacturer in support
of his claim)
6.
Maximum temperature rise of
a) windings by resistance method
b) Oil by Thermometer
7.
Magnetising (No load) Current at
a) Normal Voltage
b) Maximum Voltage
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8.
Core loss in watts
a) Normal Voltage
b) Maximum Voltage
9.
Resistance of Windings at 20 deg. c
(with 5% tolerance)
a. HV Winding (ohms)
b. LV Winding (ohms)
10.
Full load losses (watts) at 75 deg.C.
11.
Total losses at 100% and 50% load
at 75 deg. C
12.
Current density used for HV winding
& LV winding.
13.
Clearances
a) Core & LV
b) LV & HVc
c) HV Phase to Phase
d) End insulation clearance to Earth
e) Any point of winding to tank
14.
Efficiency at 75 deg.C.
a) Unity P.F. &
b) 0.8 P.F.
1) 125% load
2) 100% load
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3) 75% load
4) 50% load
5) 25% load
15. Regulation at
a) Unity P.F.
b) 0.8 P.F. at 75 deg.C.
16. % Impedance at 75 deg.C.
17. Flash Test
(a) HV 28 kV / 50 HZ for 1 minute - 11 KV
(b) HV 50 kV / 50 HZ for 1 minute - 22 KV
( c) LV 3 kV/50 Hz for 1 minute
18. Over potential Test Double Voltage &
Double frequency for 1 minute
19. Impulse test value in KVP
20. Weight content of
a) Core lamination (min)
b) Windings (min) Aluminum./Copper
c) Tank & Fittings
d) Oil
e) Oil qty (min)
f) Total Weight
21. Oil Data
1. Qty for first filling (min)
2. Grade of oil used
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3. Maker’s name
4. BDV at the time of filling
22. Transformer:
1) Overall length x breadth x height
2) Tank length x breadth x height
3) Thickness of plates for
a) Side plate (min)
b) Top & Bottom plate (min)
4) Conservator Dimensions
23. Radiation:
1) Heat dissipation by tank walls exclusive top & bottom
2) Heat dissipation by cooling tube
3) Dia & thickness of cooling tube
4) Whether calculation sheet for selecting cooling
area to ensure that the transformer is capable
of giving continuous rated output without exceeding
temperature rise is enclosed.
24. Inter layer insulation provided in design for
1) Top & bottom layer
2) In between all layer
3) Details of end insulation
4) Whether wedges are provided at 50% turns of the HV coil
25. Insulation materials provided
a) For Conductors (1) HV (2) LV
b For Core
26. Material and Size of the wire used
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1) HV a) SWG/mm
b) Dia
2) LV a) Strip size
b) No. of Conductors in parallel
c) Total area of cross section (sq.mm.)
27. Is the name plate gives all particulars as required in Tender
28. Particulars of Bushings HV / LV
1) Maker’s name
2) Type IS-3347/IS-1180
3) Rating as per I.S.
4) Dry power frequency voltage withstand test
5) Wet power frequency voltage withstand test
NOTE:
1.
2.
The following shall be specifically confirmed
Whether the offer conforms to the limits of impedance mentioned in the
specification
Whether the offer conforms to the limits of temperature rise mentioned in the
specification
3.
Whether the losses of the transformers offered are within the limits specified
4.
Whether the transformer offered is already type tested for the design and test
reports enclosed.
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SEAL & SIGNATURE OF THE TENDERER
SCHEDULE -A
ANNEXURE-II
ADDITIONAL DETAILS
Sl.No.
Description
22KV/200KVA
1.
Core Grade
2.
Core diameter
mm
3.
Gross Core area
cm
4.
Net Core area
cm
5.
Flux density
Tesla
6.
Wt. of Core
kg.
7.
Loss per kg. of Core at the
22KV/500KVA
specified Flux density
8.
Core window height
Watts
9.
Center to center distance of the core
mm
10.
No. of L.V. Turns
mm
11.
No. of H V turns
12.
Size of LV Conductor bare/ covered
mm
13.
Size of HV conductor bare/covered
mm
14.
No. of parallels
15.
Current density of LV winding
amps/sq.mm.
16.
Current density of HV winding
amps/sq.mm
17.
Wt. of the LV winding for Transformer
kg.
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18.
Wt. of the HV winding for Transformer
kg.
19.
No. of LV Coils/phase
20.
No. of HV coils / phase
21.
Height of LV Windings
mm
22.
Height of HV winding
mm
23.
ID/OD of LV winding
mm
24.
ID/OD of HV winding
mm
25.
Size of the duct in LV winding
mm
26.
Size of the duct in HV winding
mm
27.
Size of the duct between HV & LV
mm
28.
HV winding to LV winding clearance
mm
29.
HV winding to tank clearance
mm
30.
Calculated impedance
%
31.
HV to earth creepage distance
mm
32.
LV to earth creepage distance
mm
SEAL & SIGNATURE OF THE TENDERER
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SCHEDULE - A
ANNEXURE-III
SOURCE OF MATERIALS/PLACES OF MANUFACTURE, TESTING AND INSPECTION
Sl.No.
Item
Source of
Material
Place of
Manufacture
Place of testing
and inspection
Laminations
1.
2.
Copper Conductor
3.
Insulated winding wires
4.
Oil
5.
Press DGVCLs
6.
Kraft Paper
MS Plates/ Angles/
7.
Channels
8.
Gaskets
9.
Bushing HV / LV
10.
Paints
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SEAL & SIGNATURE OF THE TENDERER
SCHEDULE-B
DEVIATIONS FROM SPECIFICATION
Sr.
No.
CLAUSE NO.
DETAILS OF DEVIATION
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NAME OF FIRM------------------------------------------
NAME & SIGNATURE
OF TENDERER
----------------------------------
DESIGNATION ------------------------------------------
DATE -------------------------------------------------------
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SCHEDULE - C
SCHEDULE OF TENDERER’S EXPERIENCE
Sr.
No.
Name of Client &
Description
Value of order
along with cap. of
transformer
Period of supply
and
commissioning
Name & address to
whom reference
may be made
1
2
3
4
5
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NAME OF FIRM ___________________________
NAME & SIGNATURE OF TENDERER
_________________________
DESIGNATION _____________________________
DATE
___________________________________
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SCHEDULE - D
SCHEDULE OF DEVIATION FROM SPECIFIED STANDARDS
Stipulation of specified
standards
Sr.
No.
Stipulation of standard
adopted by tenderers
Remarks
Particulars
Standard
Ref.
1
2
Stipulations
Standard
Ref.
3
4
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5
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NAME OF FIRM ___________________________________
NAME & SIGNATUR
OF TENDERER
_______________________________
DESIGNATION __________________________________
DATE
__________________________________________
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SCHEDULE - E
DEVIATION FROM SPECIFIED TEST REQUIREMENTS SPECIFIED IN RELEVANT AND PRESENT
SPECIFICATIONS.
Sr.
No.
1
Name of Test
Standard
No. and
clause no.
Requirement
of standards
Proposed
deviation
2
3
4
5
Reason for
deviation
1.
TYPE TEST
2.
ADDITIONAL
TEST
3.
ACCEPTANCE
TEST
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4.
ROUTINE TEST
NAME OF FIRM ___________________________________
NAME & SIGNATURE OF TENDERER ________________
DESIGNATION ___________________________________
DATE __________________________________________
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QUALITY ASSURANCE PLAN FOR DISTRIBUTION TRANSFORMERS
SCOPE AND PURPOSE:
This document indicates the requirement expected by the Purchaser from the
manufacturer of Transformers. Manufacturer shall submit for purchaser’s approval a
quality assurance plan in line with this document incorporating specific document
numbers for “format of records”, “acceptance norms” and “ reference documents” for
purchaser’s approval.
Quality assurance plan is the document setting out the specific quality practices,
resources, and sequence of activities relevant to a particular product. Quality plan helps
both the purchaser and supplier as it defines each and every material used, every stage
of manufacturing process, characteristics to be checked, extent of check, reference
documents, acceptance norm and format of record specifically.
Abbreviations:
PS
-
Plant Standard / Process Specification
TR
-
Test Report
IS
-
Indian/ International Standard
CS
-
Customer Specification
AD
-
Approved Document such as Drawing, Purchase Order
V
-
Verified by
P
-
Performed by
W
-
Witnessed by
H
-
Hold by Purchaser
1
-
Purchaser
2
-
Manufacturer
3
-
External laboratory
4
-
Sub Vendor QC
Notes:
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1)Minor: The characteristics of a component, process or operation whose
failure
neither materially reduce the usability of the product in operation, nor does it affect
the aesthetic aspects.
2) Major: The characteristics of a component, process, or operation whose failure may
cause operation failure which cannot be readily corrected, at site cause substandard
performance, increase erection and maintenance cost, reduce life or seriously affect
aesthetics.
3) Critical: The characteristic of a component, process, or operation failure of which
will surely cause operating failure or intermittent troubles which is difficult to rectify at
site or render the unit unfit for use or safety hazards.
4)“Failure” of a characteristic means failure to meet the ‘accepted norms’
5)Sampling: Generally sampling will be done in accordance with IS: 2500. Sampling will
be as under:If 100% “Witness” of tests is carried out by Prime supplier, Customer will witness on
sample basis or if 100% “Witness” of tests is carried out by Sub Vendor, Manufacturer
will witness on sample basis.
The material supplied shall be conforming to Indian Standard Specification and also with
ISI marking and even after inspection of the lot, if the material received at site is found
without ISI marking , the loot shall be rejected and no further correspondence shall be
entertained in this regard.
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1.3 LT PANEL SPECIFICATIONS
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1.0 SCOPE
This specification covers the technical requirements of design, test, supply of 415+-10%
Voltage L.T. Panels complete with all accessories for efficient and trouble free
operation. All the panels shall be manufactured as per the following specification.
2.0 Standards:
AS PER SCHEDULE OF INDIAN STANDARD; ATTACHED WITH THE DOCUMENT.
The LT PANEL shall comply with the latest edition of relevant Indian standards and
Indian Electricity rules and regulations. The following Indian Standards shall be complied
with:
IS : 4237 : General requirements for switch gear and control gear for voltage not
exceeding 1000 V.
IS : 375 : Switchgear bus-bars, main connection and auxiliary wiring,marking and
arrangement.
IS : 2147 : Degree of protection provided by enclosures for low voltage switch gear and
control gear.
IS : 8197 : Terminal marking for electrical measuring instrument and their accessories.
IS : 2557 : Danger notice plates.
IS : 2516 : Specification for AC circuit breaker.
IS : 1818 : Specification for AC isolator and earthing switch.
IS : 3072 : Code of practice for installation and maintenance of switchgear.
IS : 8623 : Specification for factory built as symbolize of switch gear and control gear for
voltage up to and including 1000v. A.C.& 1200 v.D.C.
IS : 8828 : Miniature Circuit Breaker.
IS : 4064 : Fuse switch and switch fuse unit.
IS : 9224 : HRC fuse unit.
IS : 2705 : Current transformer.
IS : 3155 : Voltage transformer.
IS : 3231 : Electrical relay for protection.
IS : 1248 : indicating instrument.
IS : 722 : Integrating instrument.
IS : 6875 : Control switches & push buttons.
IS : 2959 : Auxiliary contactor.
IS : 1822 : AC motor starters of voltage not exceeding 1000V.
IEC-439-1, 1992Low voltage Switch gear and Control gear assemblies Part-I, type tested
and partially type tested assemblies.
IEC-947-1, 1998 Low voltage Switch gear and Control gear Part-I general rules.
IEC-1180-1, 1992 High voltage test techniques for low voltage equipment Part–I
definition test and Procedure requirement
IEC-529, 1989 Degree of protection provided by enclosures (IP code).
3.0 Indian Electricity Acts & Rules:-
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All codes & standards means the latest, wherever not specified. The manufacturing shall
generally follow the Indian Standard codes of practice or the relevant British Standard
Codes of Practice in the absence of corresponding Indian Standard.
4.0 L.T SWITCH GEAR PANEL.
The 415+-10% Volt switchgears shall be in a cubicle made 12 SWG gauge sheets, treated
against corrosion protected with phosphate coating and powder coated for long life. The
cubicle shall be of dust and vermin proof construction. The design and arrangement of
the equipment shall be such that an adequate space and access is provided in cubicle
for inspection and maintenance of MCCBs and breakers etc.
5.0 STRUCTURE:
5.1 The LT Panel, shall be metal clad enclosed and be fabricated out of high Quality
12SWG CRCA sheet, suitable for outdoor installation having dead front operated and
base frame mounting type
5.2 The LT Panel shall be totally enclosed, completely dust and vermin proof and degree
of protection being not less than IP -54 for outdoor panels . Gaskets between all
adjacent units and beneath all covers shall be provided to render the joints dust proof.
All doors and covers shall be fully gasket with foam rubber and / or rubber strips and
shall be lockable.
5.3 All panels and covers shall be properly fitted and screwed with the frame, and holes
in the panel correctly positioned. Fixing screw shall enter into holes taped into an
adequate thickness of metal or provided with bolts and nuts
5.4 A base channel of 75 mm x 75 mm x 5 mm thick shall be provided at the bottom.
5.5 The LT Panel shall be of adequate size with a provision of 20 percent spare space to
accommodate possible future additional switch gear. The size of the LT Panel shall be
designed in such a way that the internal space is sufficient for hot air movement, and
the electrical component dose not attains temperature more than 50 degree Celsius. If
necessary openings shall provided for natural ventilation, but the said openings shall be
screened with fine weld mesh.
5.6 Alternatively the LT Panel shall provide with removable sheet plates at bottom to
drill holes for cable / conduit entry at site.
5.7 The LT Panel shall be designed to facilitate easy inspection, maintenance and
repair.
5.8 The LT Panel shall be sufficiently rugged in design and shall support the equipment
without distortion under normal and short circuit condition, they shall be suitable
braced for short circuit duty.
5.9 The complete structure shall rigid, self supporting and free from vibrations, twists
and bends.
5.10 Cleaning & Painting :
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a) All steel surfaces shall be thoroughly cleaned by sand blasting or chemical
agents, as required to produce a smooth surface free of scales, grease and
rust.
b) All the internal-external Surfaces, after cleaning, shall be given two coats of
high quality epoxy based rust resisting primer as per IS:2074 followed by filler
coats.
c) Both sides shall be given Powder coating by ‘Electrostatic Spraying Process’.
Powder coating shall be of ‘Grade A: Glossy Finish’ as per IS:13871 in
Battleship Grey epoxy based enamel paint as per IS:2932. The thickness of
Powder coating shall be 50 – 60 micron.
d) The paints shall be carefully selected to withstand tropical heat rain, effect
of proximity to the sea etc. The paint shall not scale off or crinkle or be
removed by abrasion due to normal handling.
e) Special care shall be taken by the manufacturer to ensure against rusting of
nuts, bolts and fittings during operation. All bushings and current carrying
parts shall be cleaned properly after final painting.
Enameled caution boards shall be supplied by the purchaser and shall be fitted on front
side of the cubicle by the supplier
6.0 PROTECTION CLASS:
All the outdoor LT Panel shall have protection class as per IS.
7.0 CIRCUIT COMPARTMENT:
7.1 Each circuit breaker and MCCB units shall be housed in separate compartments and
shall be enclosed an all sides
7.2 The door shall not form as integral part of the draw out position of the circuit
breaker. All instruments and indicating lamp shall be mounted on the compartment
door.
8.0 INSTRUMENT COMPARTMENT
Separate and adequate compartment shall provided for accommodating instruments,
indicating lamp, control contactors, relays and control fuses etc. These components
shall be accessible for testing and maintenance without any danger of accidental
contact with live parts of the circuit breaker, MCCB units, busbars and connections.
9.0 BUS BARS
Three Phase and neutral bus bars shall be provided in the cubicle .All the main/ branch
bus bars shall be made out of high conductivity aluminum (E91E) supported on insulators
made of non-hygroscopic, non-inflammable material with tracking index equal to or
more than that defined in BIS. The Aluminum bus bars of rating as per Incomming
breaker amp capacity shall be supported on insulators for incomer/mains/ neutral.
For sub-mains for outgoing ckts. The Aluminum Bus bar for sub-mains /outgoing circuits
should be of appropriate size according to the capacity of MCCB.Earth bus bar should
also be of appropriate, size as per applicable standards.
The current rating of the neutral shall be half that of the phase busbars. Removable
neutral links shall be provided on feeders to permit isolation of the neutral bus bar.
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Only zinc passivated or cadmium plated high tensile strength steel bolts, nuts and
washers shall be used for all bus bar, joints and supports.
The hot spot temperature of bus bars including joints at design ambient temperature
shall not exceed 95°C for normal operating conditions.
The current rating of the bus bars shall be as per table for design ambient temperature
at site conditions and for being inside the cubicle at fully loaded condition. The vendor
shall suitably de-rate the nominal rating to suit the above condition.
The minimum clearance between phase to phase, phase to neutral & electrical
clearance in between bus bars and cubicle shall be in accordance to applicable IS
specifications All the bus bars in the panel shall be duly insulated with PVC /heat
shrinkable sleeves of superior quality with Colour coding of RYB for phase indicators as
well as Black for neutral in uniformity.
The busbar shall be housed in a separate compartment. The busbar shall be isolated
with 3 mm thick bakelite sheet to avoid any accidental contact. The busbar shall be
arranged such that minimum clearances between the busbar are maintained as per IS.
10.0 INTERNAL WIRING :10.1 Panel shall be supplied with all internal wiring comprising of PVC insulated 1.1 KV
grade, multistrand flexible copper conductor of 2.5 Sq.mm cross section.
10.2Control wiring shall have MCB (“C” Curve) with appropriate amp ratings
10.3 Wiring associated with a particular phase shall be the colour of that phase viz. Red
/Yellow, or Blue. Wiring associated with earthing shall be with green colour insulation
and for neutral it shall be with black colour insulation.
10.4 Wiring shall be neatly laid and run on insulated cleats of limited compression type
insulated straps.
10.5 All cables shall have crimped terminations and shall be identified by means of
glossy plastic ferrules at both ends, showing the wire number as indicated in the
schematic diagrams. The ferrules shall be indelibly marked.
10.6 Final wiring diagram of the LT PANEL power and control circuit with ferrules
number shall be submitted along with the LT PANEL as one of the documents.
11.0 Labels:
11.1 02 nos. 440 Volts Danger boards should be fixed and displayed prominently on the
front of the LT panel.
11.2 Labels shall be provided to describe the duty of or otherwise identify every
Instrument, or other item of equipment mounted internally and externally. Switch
positions shall be fully identified. Wording shall be clear, concise and unambiguous.
11.3 Each label shall be permanently secured to the panel surface below the item to
which it refers.
12.0 Earthing:
12.1 Panel shall be provided with Alluminium earth bus bars (both ends) as per IS: 8623.
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12.2 Earth Bus bar shall be supported at suitable intervals.
12.3 The panel shall be provided with two brass earthing stud terminals, with suitable
nuts, washers etc. for connection to ground bus.
13.0
Air circuit breaker (ACB)
These shall be fixed type with manually operated mechanism. The short circuit
mechanism and breaking capacity as shall be supported by test certificate.
The circuit breaker shall be fitted with CT operated microprocessor base overload and
short circuit releases devices for current rating AMP as per table.
a) Overload releases should be settable from 50% to 100% of the rated current In.
b) Ambient temperature compensated type and there should not be de-rating of ACB
current carrying capacity at 40°C. The testing of ACB for the temperature rise shall
be carried out by the manufacturer as per the prevailing, IS / IEC or any other
international standards.
1) 3 pole arrangement.
2) Rated current thermal current
- as per table
3) Service voltage
- 415 volts
4) No. of break / pole
- one
5) Frequency
- 50 c / s
6) Rated insulation voltage
- 1000 volts
7) Rated short circuit breaking capacity
Rated services S/C breaking capacity Ics (rms) – 50kA
Rated ultimate S/C breaking capacity Icu (rms) – 50kA
8) Suitable for outdoor installation.
9) It shall conform to IS 13947 / pt.2 / 1993 with latest amendment, if any.
10) Performance category : Utilization category – C.
11) The status of open and close shall be clearly visible.
12)The trip indication separated for overload and individual phase wise trip
indication for short circuit to be provided.
12) The ACB shall have the provision to lock the operating mechanism in off
position.
13) The operating mechanism should be form front and the compartment
should have the degree of protection IP – 54.
14) Separator shall be provided between all phases inside. ACB enclosed to
prevent travel of arc during short circuit.
15) The CTs mounted for microprocessor base overload release shall have
secondary winding inaccessible including tripping mechanism of O/L and
magnetic releases to avoid tampering CTs should also have provision of
separators.
16) Two nos. earthing bolts for propose of earthing of ACB may also be
provided & suitable for G.I stay wire of size 7 / 10 SWG.
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17) The bus bar size shall be confirming to relevant IS and the neutral bus bar
shall be of same wire of size as phase bus bar and should be suitable for
connecting neutral.
18) The ACB shall be tested in accordance with the provision of IS 13947 –
Part I or relevant IEC
13.1 Construction
The breakers shall be designed, manufactured as per IS:13947. The circuit breaker shall
be fully draw out type. Suitable guides shall be provided to facilitate easy withdrawal of
the trolley.
13.2 Operating Mechanism
13.2.1 The breaker mechanism shall be 230V AC motor charged spring operated type.
Tripping shall be effected by mean of shunt trip coil.
13.2.2 The operating mechanism shall be trip-free. Failure of spring, vibrations or
shocks shall not cause unintended operation of breaker or prevent intended tripping
operation. Closing of breakers shall be prevented unless the spring is fully charged.
13.3 Interlocks
The breaker shall be provided with all necessary interlocks to prevent inadvertent
operations and to ensure safety of operating personnel and also the equipment.
14.0 Moulded case circuit breaker (MCCB) 3 pole
MCCB conforming to relevant IS specifications with adjustable over load thermal
magnetic releases and having short ckt. Breaking capacity 50 KA at 415 Volt, 50HZ with
Rotary Handle.
Connection between transformer LT terminal to ACB and MCCB shall be through
aluminum bus bars, outgoing from MCCB shall be suitable as per table.
15.0 INDICATING LAMPS :Indicating Lamps shall be cluster LED type suitable to operate on 240 V AC.
16.0 AC Ammeter & Voltmeter.
Analog type AC Ammeter & Voltmeter (Flush in type) with selector switches to be
installed on Incommer. As per breaker full load amp.
17.0 Panel Indication Lamps
On Each Incomer
o Red Indication Lamp for ACB “ ON” position.
o Green Indication lamp for ACB”OFF” position.
o Red, Blue, Yellow indicator lamps for indicating “ Healthy Phases”
18.0 Auxiliary supply
3phase with neutral, 440V AC supply shall be tapped from main bus bar after the ACB
for supply to lighting of the substation. Necessary protection in incomer and outgoing
shall be provided.
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19.0 PUSH BUTTONS
Push buttons shall be generally shrouded. Each push button shall be provided with 1 N/O
and 1 N/C aux. contacts. "Stop" push button shall have, 'stay-put' feature. Colour code
shall be as per IS-6875.
20.0 Testing:
Prior to dispatch, the panel will be subject to:
The tests shall be carried out in accordance with IEC 62271-202 include but not
necessarily limited to the following:
ii. Test on auxiliary and control circuits.
iii. Functional tests.
iv. Verification of correct wiring.
v. Test after assembly on site.
ii. Insulation test at 2.5 KV for 1 Minute.
iii. Megger-Test by 1000 V Megger.
TEST WITNESS
All tests shall be performed in presence of owner's representatives, if so desired by the
Owner. The Contractor shall give at least fifteen (10) days advance notice of the date
when tests are to be carried out.
TEST CERTIFICATES
Certified reports of all the tests carried out at the works shall be furnished in SIX (6)
copies for approval of the Owner.
The equipment shall be dispatched from works only after receipt of Owner's written
approval of the test reports.
21.0 MANUAL
The bidder has to provide the complete manual for the operation of the breaker and
MCCB.
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2.0 Mini Section Pillar (MSP)
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TECHNICAL SPECIFICATIONS FOR (MSP) MINI SECTION PILLER MADE FROM
THERMOSETTING PLASTIC.
1.0
1.1
SCOPE:
This specification covers the design, manufacturing and testing of MSP with anticorrosive, dust proof, rust proof, shock proof, self extinguishing property, resistant
to heat, vermin & water proof, Ultra Violet Stabilized and pilfer resistant made
from
Thermosetting
Plastic
i.e.
Glass
Reinforced
Polyester
Sheet
Moulding Compound
(SMC)
Confirming to IS:
13410
-1992 and
attached
technical specification,
and
IS:
14772-2000 with
SMC
HRC f u s e b a s e
confirming t o IS: 13703/1993 (Pt.I & II amended up to date)and other relevant IS.
2.0
GENERALREQUIREMENT:
MSP should b e designed to have maximum utilization for giving consumer services
and shall be well equipped with adequate protection against weather condition.
2.1
SERVICECONDITION
TEMPERATUARE
The materials used in Construction of the MSP shall be suitable for use under
following conditions.
(a)
Maximum ambient temperature
55 ° C
(b)
Maximum daily average ambient temperature.
37 ° C
(c)
Minimum temperature.
00 ° C
(d)
Altitude
0 to 1000 meter
(e)
Maximum yearly average air temp.
35 ° C
a) RELATIVE HUMIDITY
This does not exceed 50% of maximum temperature of 40 ° C and 90 % at 20 °C
Care shall be taken for moderate condensation which may occasionally occur due
to variation in temperature. Even on sea shore side having heavy pollution the box
should function satisfactorily.
c) MODE OF INSTALLATION
The MSP are normally to be mounted on M.S. /SMS Channels fixed between two
PSC/ Girder Poles with suitable size of hot dip galvanized bolts and nuts. Or to be
installed at the suitable LT distribution route as per the instruction of field
engineer suitably grouted 1 ft below the ground level and with provision of
muffing 1 ft above ground level with properly support channels and angles.
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3.0
CONSTRUCTIONOFBOX:
3.1
The minimum size of box without rain hood shall be 820(H)x 525(W)x400(D) mm.
and with rain hood shall be 100(H) x 735 (W) x 516 (D)mm. The thickness of SMC
sheet for enclosure and door is minimum 3.15 mm.
3.2
MSP shall be of Grade S-3 SMC material MSP shall be moulded in a single piece
forming the body of the MSP with a cover fitted with base by minimum three nos.
concealed stainless steel hinges. The lid/cover shall rest on the collar of the MSP
base in such a way that any access from outside is not possible. The stainless steel
hinges shall be fitted with the MSP body base and covers rigidly, thereby making
the MSP pilfer resistant.
3.3
The door in closed position should be overlapped in such a manner that no direct
entry or access is possible. The MSP shall be closed by minimum two nos hings per
door. Minimum 50 mm length of strip having thickness not less than 1.2 mm for
holding and locking of the door with body base.
3.4
The door shall open at 90 degree (Min.). The top surface of box shall have little
tapering shape towards both sides of the distribution box for easy flow of
rainwater.
3.5
Earth bolt of 6 mm diameter X 20 mm. length with 2 nos. nuts, 2 nos. washers and
1 no. spring washer shall be provided. The earthing arrangement shall be of M.S.
with Zinc passivation. All corners of the MSP should be round & not pointed ones.
All metal parts shall be zinc passivated.
3.6
The MSP should have one no of three phase and neutral incoming circuit HRC SMC
fuse base and appropriate size of lugs filled with bus bar and nine (9) nos of out
going circuit with.
3.7
Anodized aluminum operating instructions in GUJARATI shall be fixed inside the
door. The letter should be cleared legible and readable. The letters of the
instructions should be of sufficient size to read with normal eye.
3.8
BUSBAR:
The MSP should have Bus bar of EC grade tinned copper bus bar duly insulated of
size 50x6 mm for all phase and neutral.
4.0
4.1
5.0
5.1
GUARANTEEDTECHNICALPARTICULARS:
Guaranteed Technical particulars are given in enclosed Annexure A. Bidder shall
submit the data in given Performa.
TYPETESTCERTIFICATE:
The bidder shall submit type test report for complete MSP as per BS 214/1959 or IS
8623/93 and for box as per IS-14772-2000 & IS: 13410- 1992 from CIPET,
Ahmedabad/ERDA, Baroda or NABL accredited lab. for the box as well as SMC fuse
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base along with the offer. Type Test Certificate should not be older than 5 years as
on the date of tender opening.
5.2
ROUTINE TEST: Manufacturer has to carryout routine test during production to
check the essential requirements that are likely to vary during production.
Manufacturer has to keep records of the same and to be produced for verification
of inspector when asked at the time of inspection of lot.
•
TYPETEST(ForSMCbox):
From the offered lot sample may be picked up at discretion of purchaser for
type test at CIPET, Ahmedabad/ERDA, Baroda or NABL accredited lab for each
lot offer. The charges for the type test shall be borne by bidder. On passing the
type test successfully, the lot shall be accepted. In case, the boxes are not
confirmed to type test, another sample from the lot shall be selected and the
tested again. On receipt of unsatisfactory results, the lot shall be rejected and
new lot shall be offered for inspection keeping aside old lot offered and
rejected earlier by the Company. However Company reserves the right
to accept the boxes by levying penalty as per description of the company.
• TYPETEST(ForIsolator/box):
Type test reports not more than 5 years old from the date of tender from
Government approved and NABL accredited lab.
1) Type Test for complete MSP as per relevant IS/BS.
5.3
ACCEPTANCETESTS:
The bidder should have all the testing facilities at their works & shall offer
testing as under. Following acceptance tests shall be carried out, on 2% of
the
offered quantity on sample boxes selected at random, while inspecting the lot of
materials offered.
A.
B.
C.
D.
E.
F.
Visual examination
Verification of dimensions as per approved drawings.
Verification of fittings
HV test at 5.2 (3.5*1.5) KV for Bus bar, 11KV for SMC material of Box.
Insulation resistance test with 2.5KV DC megger of each box.
Temperature rise test in accordance with relevant IS for the rated
capacity of MSP.
G. Earth continuity checking test.
H. 10 Operations test on SMC HRC fuse base & fuse link.
Note: DGVCL reserve the right to select one sample from whole tender quantity
and
will send Govt. approved/
NABL accredited laboratory for
complete acceptance test of all material. Cost of the same is to be
paid by contractor.
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6.0
DRAWING& CALIBRATIONOFINSTRUMENT
The tenderer shall submit detailed constructional and dimensional drawing of
complete MSP details of Units and incoming and out going circuit, Louvers details,
clearance details along with the offer.
(A)
7.0
The firm has to submit list of testing equipment’s instruments, stating Sr.
No., Make, Capacity, date of last calibration along with test certificate of
each instrument along with the offer, same is also required to be provided
to inspecting officer at the time of prototype inspection as well as regular
lots .The calibration shall be either from original manufacturer of the
equipment’s / instruments or from Government approved laboratory.
PROTOTYPE:
The successful tenderer shall have to offer 1 No. Prototype MSP for carrying out
tests mentioned at specification clause No. 5.3 at their works or at Government
approved Laboratory, where no adequate testing facility is available at firm’s
work in presence of DGVCL’s representative. In case of brought out items like
SMC HRC Fuse Units, Disconnector switch the same have to be either tested at
firm’s work or at the works of original manufacturer or at Government approved
/ recognized laboratory in case of non availability of adequate testing facility
either at firm’s
works of original manufacturer.
However,
all the
testing expenditures of prototype sample testing. Acceptance tests for
routine inspection of lots will be borne by the firm only after successful passing
of the prototype unit in all the tests and after obtaining the written approved
from the competent authority of DGVCL for prototype box and drawing approval,
the firm can commence bulk manufacturing of the ordered boxes. The expenses
towards prototype test including visit of our Engineers (2 Nos.) other than
your works shall be borne by the bidder.
8.0
RAWMATERIALS
Test certificate for the material used in the lot offered and document for
purchase of raw material should be maintained by manufacturer and produced to
inspector as and when required.
9.0
FACILITY:
The bidder shall have facility to test the box for routine tests and acceptance as
per IS – 14772: 2000 and IS – 13410 & DGVCL’s specifications at their works. The
bidder has to submit list of Machinery & Equipment / Testing instruments etc.
along with the offer.
10.0
INSPECTIONANDTESTING:
During the inspection manufacturer will offer all facilities to inspector without
any charge.
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11.0
DISPATCH:
The MSP shall be dispatched duly packed so as to ensure that no damage occurs
during transport.
11.0
INSTALLATION
Successful Bidder has to submit drawing of plinth on cable trench or on ground
level (as directed by Engineer in charge) for installation of MSP for approval.
12.0
GUARANTEE:
If the goods, stores and equipments found defective due to bad design or
workmanship the same should be repaired or replaced free of charge if reported
within 24 months from the date of commissioning of equipments. Supplier will be
responsible for the proper performance of the equipments materials for the
respective guarantee period.
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ANNEXURE – A
GUARANTEED TECHNICAL PARTICULARS FOR MSP
Sr.No.
Particulars
Particulars
to
offered by Bidders
1
Name of Trade mark of Manufacturer
2
Type of L.T. piller
3
Rated normal Voltage
4
Material of construction of L.T. Pillar enclosure and
doors
5
Thickness of SMC sheet for enclosure
6
Thickness of SMC sheet for door
7
Colour of L.T.Piller of enclosure
8
Dimension of cubical without rain hood- width x depth
x height mm.
9
Dimension of Rain hood- width x depth x height of
centre lift (in mm).
10
Fiber glass reinforce Plastic sheet moulding compound
a
Material (Thermostatic Plastic)
b
Grade of Material (SMC as per IS -31410-1992)
C
Grade of material for frame (FRP pultruded section as
per IS 6746)
d
Heat deflection temperature (as per IS 13411) ( min
150o C)
e
Exposure to flame
extinguishing )
f
Melting point ( ref std IS 13360) ( Does not melt)
g
Fiber glass reinforcement (Min 20%)
h
Density of fiber glass material (450 gm/sq mtr)
i
Maximum permissible temperature ( ≥ 90˚C)
j
Door material (UV resistance and salty and humid
atmosphere)
(ref.
std.
IS
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(Self
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be
k
Insulation Resistance (As per ASTM D257)
l
Specific Gravity as per IS:10192 of SMC material(1:8)
m
Dielectric Strength (11KV/mm)
n
Tensile Strength (70MPa)
o
Cross Breaking Strength as per ASTM D790(1723
Kg/sq.cm)
p
Shear strength as per ASTM D732(879 Kg/sq.cm)
q
Ball pressure Test as per IS:335
r
Water Absorption as per IS:14772
s
Mechanical strength as per IS:14772
11
Hinges
a
Hinges : Type
b
Hinges : Length (50mm)
c
Hinges : Thickness of material
d
Hinges :Pin diameter
e
Number of hinges per door
12
Type of locking arrangements
13
Number of padlocking arrangements
14
Size of ventilating louvers with wire mesh
15
Details of painting
16
Dimension and details of asbestoses sheets
17
Dimension and details of Bakelite sheets
18
Dimension and details of gland plates
19
Bus Bar, Fuse Base & fuse Link
a
Size of bus bar
b
Size of neutral bus bar
c
Grade and specification of material of Bus bars
d
Rated normal current of bus bars
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e
Rated safe temperature of bus bars
f
Make and Type of Fuse base assembly
g
Grade and specification of material of Fuse base
contacts
h
Thickness and dimensions of contacts of fuse base i
Rated normal current of Fuse base
j
Rated safe temperature of Fuse base
k
Grade and specification of material of Fuse links l
Make and Type of Fuse link
m
Rated normal current of Fuse link
n
Rated safe temperature of Fuse link
o
Grade and specification of material of spring steel
round
p
Dimension of steel spring round
20
Make & Type of bimetallic lugs
21
One Minute P.F Withstand voltage
22
Rated short time current
23
Rated temperature rise
24
Size Thickness of Bakelite sheets provided
25
List of test conducted on similar equipments
26
List of copies of test certificate enclosed
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3.0 LT Cable, Cable Accessories
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1. GENERAL CONSTRUCTION
1.1. Bidder has to procure the specified cable from the approved vendor list of DGVCL’s
suppliers. The cables shall be suitable for laying in trenches, ducts, and conduits and for
underground buried installation with uncontrolled backfill and possibility of flooding by water and
chemicals.
1.2. Outer sheath of all PVC and XLPE cables shall be YELLOW in colour and designed to afford high
degree if mechanical protection & shall also be heat, oil, chemical & weather resistant. The cable
sheath also suitable to protect against rodent and termite attack.
1.3. Sequential marking of length of the cable in meters shall be provided on the outer sheath at
every one meter. The embossing/engraving shall be legible and indelible.
1.4. The overall diameter of the cables shall be strictly as the values declared in the technical
information furnished along with bids subject to a maximum tolerance of +2&-2mm upto overall
diameter of 60mm & +/-3mm for overall diameter beyond 60 mm.
1.5. PVC / Rubber end caps shall be supplied free of cost for each drum with a minimum of eight per
thousand meter length. In addition, ends if the cables shall be properly sealed with caps to
avoid ingress of water during transportation and storage.
1.6. PVC Cables
1.6.1. All power / control cables for use on medium voltage systems shall be heavy duty type ,
1,100V grade with aluminum / copper conductor, PVC insulted, inner-sheathed, armoured and
overall PVC sheathed as detailed below:
1.6.2. The conductors shall be “stranded” for both aluminium and copper cables. Conductors
of nominal area less than 25 sq. mm shall be circular only. Conductors of nominal area 25 sq.mm
and above may be circular of shaped. Cables with reduced neutral conductor shall have sizes as per
Table 1 of IS 1554(Part-1). If specified in the data sheet, the copper Cables shall be tinned.
1.6.3. The core insulation shall be with PVC compound applied over the conductor by
extrusion and shall conform to the requirement of type “A” compound as per IS : 5831. The
thickness of insulation and the tolerance on thickness of insulation shall be as per Table 2 of
IS : 1554 part-1. Control cables having 6 cores and above shall be identified with
prominent and indelible Arabis numerals on the outer surface of the insulation. Colour of
the numbers shall contrast with the colour of insulation with a spacing of maximum 50 mm
between two consecutive numbers. Colour coding for cable up to 4 cores shall be as per
applicable Indian standard.
1.6.4. The inner sheath shall be applied over the laid-up cores by extrusion and shall be PVC
compound conforming to the requirements of type ST1 PVC compound as per IS: 5831. The
minimum thickness of inner sheath shall be as per Table 4 of IS: 1554-Part-1.
1.6.5. The outer sheath for the cables shall be applied by extrusion and shall be of PVC compound
conforming to the requirements of type ST-1
Compound as per IS: 5831. The thickness of outer sheath shall be as per relevant table of applicable
latest IS: 1554(part-1).
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1.7. XLPE CABLES:
1.7.1. Power cables for 1.1KV shall be aluminum conductor, XLPE insulated screened, sheathed,
armoured and overall PVC sheathed as detailed below:
1.7.2. The conductors shall be stranded and compacted circular for 1.1 KV cables & should meet the
requirement
1.7.3. 1.1KV cables shall be provided with both conductor screening and insulating screening. The
conductor shall be provided with non-metallic extruded semi conducting shielding. The
conductor screen screen shall be extruded in the same operation as insulation.
1.7.4. The core insulation shall be with cross linked polyethylene insulating compound applied by
extrusion & should be manufactured with Dry/Gas curing process. It shall be free from voids
and shall withstand all mechanical and thermal stresses under steady state and transient
operating condition. It shall conform to the properties given in Table-1 of IS: 7098(Part-2).
1.7.5. The insulation shielding shall be provided over the insulation & shall consist of non-metallic
extruded semi-conducting compound in combination with a non-magnetic metallic
screening of copper tape/wires. The copper screen of all cores combined shall be capable of
carrying the Single line to ground fault current for the duration specified in the data Sheet,
otherwise 300 Amps for screen of each core for duration of one Second. Vendor shall furnish
calculation in support of selection of the size of copper screen along with bids.
1.7.6. The conductor screen, XLPE insulation and insulation screen shall be extruded in one
operation by “Triple Extrusion Dry. Cured” process to ensure perfect bonding between the
layers. The core identifications shall be colored strips or by printed numerals.
1.7.7. The inner sheath shall be applied over the laid up cores by extrusion and shall conform to the
requirements of type ST2 compound of IS: 5831. The extruded inner sheath shall be of
having uniform thickness.
1.7.8. For multi core cables, the armouring shall be by galvanized steel strips. The dimensions of
strips shall be as per latest edition of IS: 3975. If armouring is specified/required for single
core cables in that case, the same shall be with H4 grade hard drawn aluminum round wire.
1.7.9. The outer sheath of the cables shall be of PVC compound conforming to the armouring and
shall be of PVC compound conforming to the requirements of Type ST2 compound of
IS:5831 with suitable additives shall be provided (To prevent attack by rodent & termite).
The thickness of outer sheath shall be as per amendment No. 1 to Table 5 of IS: 798- part-2.
1.7.10. The dimensions of the insulation, inner sheath and armour materials shall be governed by
values given in latest IS: 7098(pt.2)1958.
1.8. CABLE ACCESSORIES:
1.8.1. The straight through jointing kits for use on the systems shall be suitable for the type of cables
offered as per this specification.
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1.8.2. The accessories shall be supplied in kit form. Each component of the kit shall carry the
manufacturer’s mark of origin.
1.8.3. The kit shall include all stress grading insulating and sealing materials apart from conductor
fittings and consumable items. An installation instruction sheet shall also be included in each
kit.
1.8.4. The contents of the accessories kit including all consumables shall be suitable for storage
without deterioration at a temperature of 45 deg C, with shelf life extending to more than 5
years.
1.8.5. Makes of kit other than those specified in data sheet may be considered for acceptance if type
certificates along with CPRI approved drawings accompany the offer. The details of type
tests shall be as per cl. 4.2 of this specification.
1.8.6. Terminating kits: The straight through jointing kits shall be suitable for installation on ducts
and for underground burial with uncontrolled backfill and possibility of flooding by water
and chemical. These shall have protection against any mechanical damage and suitably
designed to be protected against rodent and termite attack. The jointing Kits shall be one of
the makes/ types mentioned in the data sheet.
2. TESTING AND INSPECTION:
The cables shall be tested and examined at the manufacturer’s works. All the materials
employed in the manufacture of the cable shall be subjected, both before and after
manufacture, to examination, testing and approval by DGVCL.
Manufacture shall furnish all necessary information concerning the supply to DGVCL.
Manufacture shall furnish all necessary information concerning the supply to GGVCL
inspectors. The inspectors shall have free access to the manufacturer’s work for the purpose
of inspecting the process of manufacture in all its stage and he will have the power to reject
any material which appears to him to be of unsuitable description or of unsatisfactory
quality.
2.1. PVC & XLPE CABLES:
2.1.1. After completion of manufacture of cables and prior to dispatch, the cables shall be subjected
to type, routine, acceptance and special tests as applicable. DGVCL reserves the right to
witness all tests with sufficient advance notice from vendor. The test reports for all cables
shall be got approved from the engineer before dispatch of the cables.
2.1.2 All routine tests, acceptance tests, type tests and additional type tests for improved fire
performance shall be carried out on cables as listed in IS: 1554 Part-1, and IS: 7098 Par-2.
2.1.3. The material of fillers & inner sheath shall be compatible with the temperature ratings of the
cable & shall have no detorious effect on any other component ratings of the cable. The
outer sheath of XLPE cables shall be subjected to all the tests applicable for PVC cables. The
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test requirement for insulation and sheath of PVC cables shall be as per latest revision of IS:
5831.
2.1.4. Following are the special tests to be performed on the cables if applicable and tests result for
similar type of cables shall accompany the offer.
a)
Accelerated water absorption test for insulation as per NEMA-WC-5. (For PVC Insulated
cables) and as per NEMA WC-7 (for XLPE insulated cables).
b)
Dielectric Retention Test: The dielectric strength of the cable insulation tested in
c)
If cables with FR PVC outer sheath: Oxygen index Test: The test shall be carried out as per
ASTEMD 2863 or applicable Indian standard specifications.
d)
Flammability Test: The test shall be carried out on finished cable as per IS-7098 (Pt.2)1985:
IEC-332(1).
Test for rodent and termite repulsion property: The vendors shall furnish the
Test details to analyze the property by chemical method.
2.2. CABLE ACCESSORIES:
Type tests should have been carried out to prove the general qualities and design of a given type of
termination / jointing system. The type tests shall include the following tests conforming to VDE
0278/IS specification. The type tests certificates shall be submitted along with the offer for such makes
of accessories not mentioned in the data sheet.
2.2.1. Rated withstand A.C. Voltage test
2.2.2. Partial discharge test
2.2.3. Rated withstand surge voltage test
2.2.4. Continuous A.C. Voltage test with cycle current load (Number of heating Cycles-3).
2.2.5. Partial discharge test
2.2.6. Continuous A.C. voltage test with cyclic current load (Number of heating Cycles-63).
2.2.7. Thermal short circuit test
2.2.8. Continuous A.C. Voltage test with cyclic current load (Number of heating Cycles-63).
2.2.9. Rated withstand surge voltage test
2.2.10. D.C Voltage test
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2.2.1.1. Test under the influence of moisture
2.2.12. Dynamic short circuit test.
3. PACKING AND MAKING
Cables shall be dispatched in non-returnable wooden drums of suitable barrel diameter.
Securely battened, with the take-off end fully protected against mechanical damage. The wood used
for construction of the drum shall be properly seasoned, sound and free from defects. Wood
preservatives shall be applied to the entire drum. Ferrous parts used shall be treated with a suitable
rust preventive finish or coating to avoid rusting during transit or storage.
On the flange of the drum, necessary information such as project title, manufacturer’s name,
type, size, voltage grade of cable, length of cable in meters drum no, cable code, BIS certification
mark, gross weight etc. shall be printed. An arrow shall be printed on the drum with suitable
instructions to Show the direction of the drum.
4. ERECTION SPECIFICATION FOR CABLING
Scope
This is defining the requirements for supply, wherever applicable the installation, testing and
commissioning of the cabling system.
Standards:
The work shall be carried out in the best workmen like manner in conformity with this
specification, the relevant specification and codes of practice of Indian standards institution,
approved drawing and instruction of Engineer-in- charge or his authorized representative issued from
time to time. In case of any conflict between the standards, the instructions of Engineer- in-charge
shall be binding.
Power cable specification:
Power cables for use on 415 V systems shall be of 1100 Volts grade, aluminum standard
conductor, PVC insulated, and PVC sheathed single wire armoured and overall PVC sheathed. Power
cables for 1.1kv systems shall be aluminum conductor, XLPE insulated, screened, PVC bedded
galvanized steel flat armoured and PVC sheathed cable. All L.T. cables conform to Indian standard
specification and relevant sections of IS: 1554 Part-I and II.T. Cables shall conform to IS:
7038 (Part 2). Unarmoured Cables to be supplied shall be from any of the IS/ISI approved makes
such as Asian/CCI/Universal/ICI/ICC/Havells.
CABLE LAYING:
4.4.1 Cables as far as possible shall be laid in complete, uncut lengths from one termination to
the other.
4.4.2 Cables shall be neatly arranged in the trenches in such a manner so that criss-crossing is
avoided and final takes off to the switchgear is facilitated. Arrangement of cables within the
trenches shall be responsibility of the contractor. Cable routing between lined cable trench
and equipment shall be taken through appropriate support arrangement.
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4.4.3 All temporary ends of cables must be protected against dust and moisture to prevent
damage to the insulation. For this purpose, ends of all PVC insulated cables shall be taped
with an approved PVC or rubber insulation tape. Use of friction type or other fabric type
tape is not permitted. Lead sheathed cables shall be plumbed with lead alloy.
4.4.4. Cables shall be handled carefully during installation to prevent mechanical injury to the
cables. Ends of cables leaving trenches shall be coiled and provided with a protective pipe or
cover, until such times the final termination to the equipments is completed.
4.4.5. Directly buried cables, if required shall be laid underground in excavated cable trenches
where specified. Trenches shall be of sufficient depth and width for accommodating of all
cables correctly spaced and arranged with a view of heat dissipation and economy of design.
Minimum depth of buried cable trench shall be 750mm for low voltage cables, the depth
and the width of the trench shall vary depending upon the number of layers of cables as per
Indian standard.
4.4.6. As each row of cables is laid in place and before covering every cable shall be given an
insulation test in the presence of Engineer-in-charge / DGVCL. Any cable, which proves
defective, shall be replaced before the next groups of cables are laid.
All wall openings / pipe sleeves shall be effectively sealed after Installation of cables to avoid
seepage of water inside building / lines trench.
4.4.7 Where cables rise from trenches to D.P. / S.S., MSP etc. they shall be taken in G.I. pipes /
HDPE PVC pipe for mechanical protection up to a minimum permissible height.
Cables ends shall be carefully pulled through the conduit, to prevent damaged to the cable.
Where required, approved cable lubricant shall be used for this purpose. Where cable enters
conduit the cable should be bent in large radius. Radius shall not be less than the
recommended bending radius of the cables specified by the manufacture not less than 15D
of cable outer diametre.
Following guide of the pipe fill shall be used for sizing the pipe Size:
1 cable in pipe - 53% full
2 cable in pipe - 31% full
3 or more cables - 43% full
4 Multiple cables - 40% full
After the cables are installed and all testing is complete, conduit Ends above grade shall be
plugged with a suitable weatherproof Plastic compound / “PUTTI” for sealing purpose.
Alternatively G.I. Lids or PVC bushes shall be deemed to have been included in the Cost for
the same shall be deemed to have been included in the Installation of G.I. pipe and no
separate payment shall be allowed.
4.4.8. Where cables pass through foundation walls or other underground structure, the
necessary ducts or opening will be provided in advance for the same. However, should it
become necessary to cut holes in existing foundations or structures. The electrical
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contractor shall determine their location and obtain approval of the Engineer-in-charge
before cutting is done.
4.4.9. At road crossing / railway crossing and other places where cables enter pipe sleeves
adequate bed of sand shall be given so that the cables do not slack and damaged by pipe
ends.
4.4.10. Drum number of each cable from which it is taken shall be recorded against the cable
number in cable schedule. Cables shall be so routed that they will not be subjected to heat
from adjacent hot piping or vessels.
4.1.1.11. Cables installed above grade shall be run in trays, exposed on walls, ceilings or
structures and shall be parallel or at right angles to beams, walls or columns.
4.4.12. In case of individual cables or small groups which run along structure / walls etc. will be
clamped by means of 16 SWG GI saddles on 25*6 mm saddle bars. The cost of the saddle
and saddle bars shall be deemed to have been included in the installation of cables and no
separate payment shall be made on this account. Alternative small group of cables can be
taken through 100 mm slotted channel / ISMC 100 / angle support. They shall be rightly
supported on structural steel and massonary individual or in groups as required, if drilling of
Steel must be resorted to, approval must be secured and steel must be drilled where the
minimum weaking of the structure will result.
Cables shall be supported so as to prevent unsightly sagging.
4.4.13. If required, Cable laid on supporting angle in cable trenches, structures, columns and
vertical run of cable trays shall be suitably clamped by means of G.I. Saddle / clamps,
whereas cable in horizontal run of cable trays shall be tied by mean of nylon cords.
4.4.14 The identification marker shall be placed on each cable at every 2 Mtrs intervals
and at every cable joint locations, of adequate size fabricated from 3 mm thick, 25
mm wide aluminum strip. The marker shall be tied by nylon string with cable. The
marker shall be embossed by letter as stated below as applicable.
DGVCL- 1.1 KV – Name of feeder
4.5
Testing:
4.6.1 Before energizing, the insulation resistance of every circuit shall be measured from phase to
phase and from phase to ground.
4.6.2 Where splices or termination are required in circuit rates above 600volts, measure insulation
resistance of each length of cable before splicing and or / terminating. Repeat
measurements after splices and / or terminations are complete.
4.6.3 Measure the insulation resistance of directly buried cable circuits, before cable trenches are
back-filled. Repeat measurement after back-filling.
For cables up to 1.1 KV grade 1000KV Megger and for H.V. Cables 2.5KV Megger shall be
used.
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4.6.4
D.C. High Voltage Test shall be conducted after installation on the following and test results
are recorded as DGVCL format.
a (All 1000 volts grade cables in which straight through joints have been made.
b (All cables above 1.100 V grade.
For record purposes test date shall include the measure values of leakage current verses
time.
The D.C. High Voltage test shall be performed as detailed below in the presence of
Engineer-in-charge or his authorized representative only.
the
Cable shall be installed in final position with the entire straight through joints complete.
Termination shall be kept unfinished so that (if any) switchgears, transformers etc. are not
subjected to test voltage.
The test voltage shall be 18KV DC for 1.1KV grade cables.
GuaranteedTechnicalParticulars
(To be filled by bidder)
1.
2.
3.
;
General
;
1.1.
Name of Manufacturer
1.2.
Place of Manufacturing
1.3.
Applicable standard IS/IEC
1.4.
Design ambient temperature
;
;
;
Cable parameters
;
2.1.
Voltage grade
2.2.
Permissible voltage & frequency variation
satisfactory operation
2.3.
Nos of cores & size
For standard condition as per IS
3.1.1.
In air
3.1.2.
In ground
3.1.3.
In duct
3.1.4.
In trench
;
;
;
;
;
;
;
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;
Continuous current carrying capacity
3.1.
Date
;
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3.2.
4.
5.
6.
;
For site condition
3.2.1.
In air
3.2.2.
In ground
3.2.3.
In duct
3.2.4.
In trench
;
;
;
;
;
Conductor
;
4.1.
Material
4.2.
Applicable standard IS/IEC
4.3.
Shape of conductor
4.4.
Nominal cross section area (mm2)
4.5.
Number of wires per core
4.6.
Nominal diameter & cross section area of each wire
used in each core of the conductor
;
;
;
;
;
Insulation
;
5.1.
Material
5.2.
Applicable standard IS/IEC
5.3.
Thickness of insulation (mm)
5.3.1.
Between cores
5.3.2.
Between cores & inner sheath
5.4.
Tolerance in thickness (percent) of insulation
5.5.
Diameter of core over insulation (mm)
5.6.
Specific insulation resistance at ninety (90) degree
Centigrade (Ohm-Cm)
;
;
;
;
;
;
;
;
Filler
;
6.1.
Material
6.2.
Applicable standard IS/IEC
6.3.
Whether suitable for operating temperature of Cable
(Yes/ No)
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;
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6.4.
7.
8.
9.
No of fillers provided including central filler
;
Inner sheath
;
7.1.
Material
7.2.
Applicable standard IS/IEC
7.3.
Extruded or wrapped
7.4.
Thickness (mm)
7.5.
Diameter of cable over inner sheath (mm)
;
;
;
;
;
Armouring
;
8.1.
Material
8.2.
Applicable standard IS/IEC
8.3.
Type of armouring
8.4.
Number of strips
8.5.
Diameter of cable over armouring
8.6.
Current carrying capacity of armour
;
8.6.1.
on continuous basis (Amp)
8.6.2.
short circuit current duration of 1 sec (KA)
;
;
;
;
;
Outer sheath
;
9.1.
Material
9.2.
Applicable standard IS/IEC
9.3.
Thickness of sheath
9.4.
Tolerance on thickness of sheath
9.5.
Overall diameter of cable (mm)
9.6.
Scheme for identification
;
;
;
;
;
;
10.1.
AC resistance per core at operating temperature
(Ohm / km)
10.2.
DC resistance per core at 20°C (Ohm / km)
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;
10. Cable constants
Date
;
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;
;
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10.3.
Reactance per core (Ohm / km)
10.4.
Capacitance per core (Microfarad / km)
10.5.
Insulation resistance at 27°C (Ohm/ km)
11.1.
Recommended minimum braiding radius (mm)
11.2.
Safe pulling force
11.3.
Cable weight (Kg / km)
;
;
;
;
;
12. Cable drum
12.1.
Net weight of cable (Kg)
12.2.
Drum weight (Kg)
12.3.
Shipping weight (Kg)
12.4.
Whether ISI Mark shall be indicated on drum
(Yes/No)
12.5.
Length of cable per drum (Meter)
12.6.
Whether details shall be embossed as stated in the
Technical Specification (Yes/No)
;
;
;
13. Whether type test reports submitted, as stated in the
Technical Specification (Yes/ No)
14. Whether documentation submitted as specified in the
Technical Specification. (Yes/ No)
15. Whether un-priced schedule of offered items submitted with
Technical offer. (Yes/ No)
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
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;
;
11. Other parameters
Date
;
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;
;
;
;
;
;
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TECHNICAL SPECIFICATION OF UNARMOURED 1.1 kV ALUMINIUM LT PVC
INSULATED PVC SHEATHED CABLES 3½ CORE 25mm², 50 mm², 70 mm² & 150 mm².
1. SCOPE:
This specification covers Manufacture; testing at works, supply and delivery of unarmored 1.1 KV
LT PVC insulated and sheathed round cable 3½ CORE 25mm², 50mm², 70mm² & 150mm² with
sector shape aluminum conductor of H4 grade class-2 to any stores in Gujarat.
2. CLIMATIC CONDITIONS:
The unarmored L.T. PVC insulated & sheathed with yellow colour outer sheath cables are required
to be laid outdoor either for giving power supply to LT motive power consumers or for LT
distribution system on transformer center. The climatic conditions will be as under.
a) Temperature Variation
: 5ºC to 55ºC
b) Relative humidity
: Up to 95%
c) Altitude
: 0 to 1000 Meters
d) No. of tropical monsoon months
: 3 (Three)
e) Max. wind pressure
: 150 Kg/cm²
f) Average annual rainfall
: 750/800 mm
g) Average thunder storm base
: 15 (Fifteen)
per annum.
h) Terrain
: Coastal saline, desert chemically polluted,
heavily/moderate, polluted and normal atmosphere
3. INSTALLATIONS:
These cables are required to be laid outdoors on the transformer structures for LT power
distribution i.e. from transformer L.T. bushings to LT distribution box and from LT distribution
box to LT overhead lines supported on poles. These cables are required to be laid overhead, hung,
exposed to Atmosphere in climatic condition as mentioned above. These are also to be used for
giving power supply to LT motive power consumers.
4.
APPLICABLE STANDARDS:
a.
b.
c.
d.
e.
f.
IS : 1554 (Part-I)1983 (For cable)
IS : 5831/1984 (For PVC Insulation/Sheath)
IS : 8130 of 1984 (For Aluminum Conductor)
IS : 10418 of 1982 (For wooden Drums)
IS : 10810 of 1984 (Methods of test’s for Cables)
IS : 10462(Part-I)1983 (Fictitious calculation method
for determination of dimensions of protective covering of cables)
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5. TECHNICAL PARTICULARS:
a) The LT PVC cables shall be unarmored PVC insulated and sheathed with shaped stranded
aluminum conductor for earthen neutral system confirming to IS: 1554 (Pt-I) 1988 with latest
amendment or revision if any. The cable shall be ISI marked and shall have characteristics suitable
for voltage rating of 1100 V in standard length as mentioned clause VIIA.
b) The word D.G.V.C.L, Voltage, Grade Electric, Year of Manufacture, IS Number and
Manufacturer’s Trademark shall be embossed clearly on every meter of cable.
c) Insulation and sheath:
The type of insulation shall be type A as per IS: 5831 of 1984with latest amendment/revision if
any. The PVC of sheath shall be type ST-1 as per IS-5831 of 1984 (with latest amendment/revision)
if any.
(d)
(e)
(f)
Colour of Insulation of each core as specified in IS.
Colour of outer sheath shall be yellow only.
Colour of inner sheath is black.
6. PACKING AND MARKING/EMBOSSING:
(i) The LT PVC cable of size 3½ Core x 25mm², 50mm², and 70mm² shall be wound on nonreturnable wooden drums with standard length of 500 Meters and 3½ cores x 150mm² shall be in
standard length of 250 Meters.
(ii)The wooden drums shall be as per IS: 10418/1982. The outer surface of the drums shall be
painted with white Aluminum paint. Similarly, the inside surface of the drums shall have the
protective layer of varnish/paint to protect it from white ants.
The ends of the cable shall be sealed by means of non-hydroscopic sealing materials.
(iii) The following information must be either stenciled on the drums
a) IS: 1554(Pt-I)/88 or as applicable.
b) Manufacturer’s Name, Brand Name or Trade Mark
c) Type of cable & Voltage Grade
d) Number of cores
e) Nominal cross sectional area of conductor
f) Cable code
g) Colour of cores
h) Length of cable on the reel, drums or coil
i) Number of lengths on reel, drum or coil
j) Direction of rotation of drum (by means of arrow)
k) Approximate gross weight & Drum No.
l) Country of Manufacture
m) Year of Manufacture
n) P.O.(A/T) No. and Date
o) Date of dispatch
p) Property of Purchaser (DGVCL/MGVCL/DGVCL/PGVCL)
q) Details of consignee (on wooden drums only)
r) ISI Mark
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7. The following words shall be duly embossed on sheath of very
meter length of cables. The embossing should be clear and visible.
a)
b)
c)
d)
e)
f)
8.
Purchaser (DGVCL/MGVCL/DGVCL/PGVCL)
Voltage Grade
Electric
Year of Manufacture
Trade Mark of Supplier
IS Number
MARKING:
Progressive running length of the cable shall be marked on outer sheath at an interval of not
more than 10 Meters.
9.
TOLERANCES:
±½% of standard length
A) STANDARD LENGTH:
Cable Up to and including the size 3½ core x 70 mm² shall be packed in 500 Meters± ½ %
whereas cable of the size 3½ core x 150mm² shall be packed in 250 Meters.± ½ % length.
B) NON-STANDARD LENGTH:
The non-standard length of not less than 100 Meters up to 3% of
Order quantity (for all sizes)
10. SUBMISSION OF ISI LICENSE AND G.T.P:
Cables bearing ISI Mark only will be acceptable. The tenderer/s should submit attested copy of ISI
License of IS: 1554 (Part-I) 1988 valid at least up to the date of tender. If applied for renewal, the
copy of receipt of fees and or acknowledgement of ISI/BSI shall be furnished along with copy of
ISI License (Expired) with the offer. The firm shall also furnish G.T.P. as per Appendix-“A”
attached.
11.
SUBMISSION OF TYPE TEST CERTIFICATE NOT MORE THAN FIVE YEARS
OLD:
The copy of the type test certificate for all type tests carried out as per IS: 1554 (Part-I) 1988 with
latest amendment/revision in force, on date of opening of tender on any of the sizes mentioned and
specified in the tender and offered by the firm, at any Govt. approved Laboratory has to be
submitted along with the offer. The party has to submit type test certificate for the all sizes ordered
on him before commencement of bulk supply and get it approved without affecting delivery
scheduled.
12. INSPECTION AND TESTING:
a) Testing will be carried out at the works of Manufacturers in presence of Company’s Engineers at
firm’s cost according to IS:1554(Part-I)1988with latest amendment/revision if any and in force on
date of inviting tender. Materials shall not be dispatched by the supplier without having been
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inspected and test certificate approved by Company’s Inspector and obtaining of specific dispatch
instruction in writing.
b)The Company reserves the right to select sample from any offered/inspected lot against the
A/T to be issued which will be get type tested at any Government approved laboratory as decided
by the Company. The results of this type-tested sample shall be applicable for the entire quantity of
the particular lot offered or supplied by the supplier. The Company shall bear the testing charges if
sample passes all the tests and if sample fails in any one of the tests, supplier shall have to bear
testing charges, same are recoverable from the supplier’s any pending bill, security deposit, Bank
Guarantee or by any suitable means, whichever deem fit by the Company. In case of sample failing
in aforesaid type tests, supplier shall have to replace the whole lot materials, which should pass
through the type tests, the re-testing charges will have to be paid by supplier. If any quantity against
the particular lot is consumed by the Company, the supplier will agree for any penalty/deduction in
price as decided by the competent authority of Company. Decision of competent authority in case
of any dispute will be final and binding to supplier.
13.
IMPORTANT:
In absence of valid ISI License, Guaranteed Technical Particulars and copy of type test certificate
attested by authorized person. Offer is liable to be ignored without any further correspondence.
14. SEALING:
Both the ends of cable are to be provided with lead seals with seal wire.
15. MACHINE/METER CALIBRATION:
All machines and meters to be used in testing shall be calibrated within valid time limit either at the
Laboratory of manufacturer or machine/meter or at Govt. recognized laboratory. The
machine/meter to be used in testing shall be in tolerance limit as per their accuracy class.
Manufacturer’s Name:
and Address:
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GUARANTEED TECHNICAL PARTICULARS (G.T.P)
TECHNICAL INFORMATION AND GUARANTEED TECHNICAL PARTICULARS (GTP)
For supply of 3.5 Core x 25 mm², 50 mm², 70 mm² , 150 mm² 240 mm2 unarmoured LT PVC
insulated and with yellow colour outer sheathed round cable.
PART – A
Sr.No.
1
Particulars
Confirmation
Cable shall be manufactured and supplied
Confirming to IS: 1554 (P-I) 1988 with latest
Amendment if any and Company’s specification
2. Cable drum shall bear ISI Mark.
Yes
Yes
3. ISI License shall remain valid till Order
is completed.
Yes
4. Colour of outer sheath – yellow
Size:
a.3.5 C x 25mm²
Yes
b. 3.5 C x 50mm²
Yes
c. 3.5 C x 70mm²
Yes
d. 3.5 C x 150mm².
Yes
5. Shape- Round
6
Yes
Standard Length is case of 3.5 Core x 25mm²,
50 mm² and 70 mm²– 500 ± 0.5%
Yes
7. Standard length in case of 3.5 core x 150 mm²
& 150 mm²--250mtr
Yes
a. Length measuring 100 Meters to 497 Meters shall be
considered non-standard length and is acceptable up to
3% of ordered quantity
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
Date
Place
Signature of the tenderer
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Company’s Round Seal
(For 3.5 core x 25mm², 50mm², 70mm²)
Yes
b. Length measuring 100 Meters to 248 Meters shall be
considered non-standard length and is acceptable up to
3% of ordered quantity (For 3.5core x 150sq.mm & 240 sq.mm)
8. Packing shall contain only one length
9.
Packing material: wooden drums as per IS: 10418/1982 duly
painted as per Clause No. 6 of tender’s specification
10.
Yes
Yes
Yes
Following shall be embossed on every Metre Length of cable.
a.Purchaser(DGVCL/MGVCL/DGVCL/PGVCL)
b. 1100 Volts
Yes
Yes
c. Trade Mark
Yes
d. Electric
Yes
e. Year of manufacture
Yes
f. IS Number
Yes
11. Progressive running length of the cable shall be
marked on outer sheath at an interval of not more
than 10 Meters
Yes
12. Marking on drum shall be as per
tender specification cl. No.6
Yes
13. The ends of the cable shall be sealed by
14.
15.
means of non-hygroscope sealing material
Yes
a. Conductor – Aluminum Sector Shape
Yes
b. Class – 2, H4 Grade
Yes
Maximum Conductor Resistance at 20ºC.
a.
For 25 sq. mm – Main Core – 1.20 Ohm/Km.
Neutral Core – 1.91 Ohm/Km
b.
For 50 sq. mm – Main Core – 0.641 Ohm/Km.
Neutral Core – 1.20 Ohm/Km
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
Date
Place
Signature of the tenderer
Yes.
Yes
Yes
Yes
Page 126/132
Company’s Round Seal
c.
d.
e.
16.
For 70 sq. mm – Main Core – 0.443 Ohm/Km.
Yes
Neutral C ore – 0.868 Ohm/Km
Yes
For 150 sq. mm – Main Core – 0.206 Ohm/Km.
Yes
Neutral Core – 0.443 Ohm/Km
Yes
For 240 sq. mm – Main Core – 0.253 Ohm/Km.
Yes
Neutral Core – 0.125 Ohm/Km
Yes
a.
PVC insulation type ‘A’ as per IS: 5831/1984
b.
Inner sheath should be thermoplastic material
Yes
or LDPE as per Cl. No. 5 & 12 of IS-1554/1988
and confirming to IS-5831/1984.
c.
Yes
Outer sheath shall be type ST-1 PVC Compound
confirming to requirement of IS-5831/1984.
Yes
17. Thickness of Insulation:
Average
smallest
Main Core
1.20 mm
0.98 mm
Yes
Neutral Core
1.00 mm
0.80 mm
Yes
a. 3.5 Core x 25 sq. mm
b. 3.5 Core x 50 sq.mm
Main Core
1.40 mm
1.16 mm
Yes
Neutral Core
1.20 mm
0.98 mm
Yes
Main Core
1.40 mm
1.16 mm
Yes
Neutral Core
1.20 mm
0.98 mm
Yes
Main Core
1.80 mm
1.52 mm
Yes
Neutral Core
1.40 mm
1.16 mm
Yes
c. 3.5 Core x 70 sq.mm
d. 3.5 Core x 150 sq. mm
e. 3.5 Core x 150 sq. mm
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
Date
Place
Signature of the tenderer
Page 127/132
Company’s Round Seal
Main Core
2.20 mm
1.88 mm
Yes
Neutral Core
1.60 mm
1.34 mm
Yes
18. Thickness of inner sheath:
a.
For 3.5 Core x 25 sq. mm – 0.30 mm (Min)
Yes
b
For 3.5 Core x 50 sq. mm – 0.30 mm (Min)
Yes
c.
For 3.5 Core x 70 sq. mm – 0.40 mm (Min)
Yes
d.
For 3.5 Core x 150 sq. mm – 0.50 mm (Min)
Yes
e.
For 3.5 Core x 240 sq. mm – 0.60 mm (Min)
Yes
19. PVC outer sheath type `ST-1’ as per IS: 5831/84
Yes
20. Thickness of outer sheath:
Average
smallest
a. 3.5 Core x 25 sq.mm
2.00mm
1.40 mm
Yes
b. 3.5 Core x 50 sq.mm
2.20mm
1.56 mm
Yes
c. 3.5 Core x 70 sq.mm
2.20mm
1.56 mm
Yes
d. 3.5 Core x 150 sq. mm
2.40mm
1.72 mm
Yes
e. 3.5 Core x 240 sq. mm
3.00mm
2.20 mm
Yes
21.
Volume Resistivity of Insulation:
a. At 27ºC – 1 x 10^13 ohm. Cm.(Min)
Yes
b. At 70ºC – 1 x 10^10 ohm. Cm.(Min)
Yes
22. Tensile Strength of Insulation & Sheath:
12.5 N/mm2 (Min)
Yes.
Elongation at break of Insulation & Sheath: 150 %( Min)
Yes
PART – B
Bidder has to furnish below details about materials for information
Sr.No.
1.
Particulars
ISI License for IS:1554 (P-I)1988
a. Number
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
Date
Place
Signature of the tenderer
Page 128/132
Company’s Round Seal
b. Date of expiry
2.
Approximate weight of 1 (one) meter length in KGs:
a) Aluminum
b) PVC
c) Total
a) 25mm²
b) 50mm²
c) 70mm²
d) 150mm²
e) 240mm²
Cable manufacturing process i.e. with
i) Inner sheath by extrusion or by wrapping?
ii) Is Binder taps are provided?
iii) Outer sheath &inner sheath by separate extrusion?
Inner and outer sheath in a single extrusion? If so than
polyester tape is required on laid up cores.
PART – C (Enclosures)
Bidder has to enclose following documents and has to confirm the same:
Sr.No.
Particulars
1. ISI License
Confirmation
(attested copy)
2. Proof if applied for renewal
Yes.
Yes
of ISI License
3. Type Test Certificate from Govt. of India’s
Yes
approved laboratory (for all cores/rating)
with yellow colour outer sheath….
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
Date
Place
Signature of the tenderer
Page 129/132
Company’s Round Seal
Rating/Size of Cable: 3.5 Core
Description
25mm²
50mm²
70mm²
150mm²
240 mm²
a) Name
of
Laboratory/City
(State)
b) Test Report
No.
c) Test Report
Date
4.
List of plant and machinery
Yes.
5.
List of testing facility available
6.
List of orders pending/executed:
Yes.
a. with GUVNL (formerly GEB)/
Yes.
MGVCL/DGVCL/DGVCL/PGVCL
b. with agencies other than 6(a) above
Yes.
PART – D
Bidders have to mention below deviation if any, Quoting relevant clause of specification.
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
Date
Place
Signature of the tenderer
Page 130/132
Company’s Round Seal
4.0 LIST OF APPROVED MAKES OF EQUIPMENTS
AND
ACCESSORIES
FOR
PROPOSED
TURNKEY PROJECT
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
Date
Place
Signature of the tenderer
Page 131/132
Company’s Round Seal
Sr.
No.
Particulars
Makes /Suppliers
C&S/Schnieder/ABB/Siemens/ Crompton
Greaves
1
Compact Sub Station
1
RING MAIN UNIT
Crompton
Greaves/C&S/Siemens/ABB/Schnieder
2
XLPE Cables
Torrent Cables, Hindustan Vidyut
Diamonds cables, Apar Industries,
Havell’s, KEI industries, Paramount &
other approved vendors of
DGVCLs/GETCO/GSECL of GUVNL.
3
LT Cables
Torrent Cables, Hindustan Vidyut
Diamonds cables, Apar Industries,
Havell’s & other approved vendors of
DGVCLs/GETCO/GSECL of GUVNL.
4
Mini Section Pillar (MSP)
5
Fuse Section Pillar (FSP)
6
End terminal Kit
7
HRC Fuses
8
Cable Glands
9
Lugs
10
G.I. Pipes
Tisco, Sail, Damodar, Zenith & Shivdurg
11
Any other accessories/Material
regarding LT panel
LV Switch Gears and other
accessories
Must be IS marked and approved vendors
12
Sintex Industries or any other approved
vendor of DGVCLs/GETCO/GSECL of
GUVNL.
Sintex Industries or any other approved
vendor of DGVCLs/GETCO/GSECL of
GUVNL.
UNCIL, Rychame, Bensons, Densons , Mseal
Havell’s or any other equivalent brands.
HME, EEW or any other IS
Dowells
mentioned below
1 ACB --------- L&T / SIEMENS/C&S/ Schnieder
2 FUSE SWITCH --------- L&T/GE/SIEMENS/C&S
3 HRC FUSES --------- L&T /GE/SIEMENS/C&S/Schnieder
4 CONTACTORS -------- L&T /Schnieder/ SIEMENS/C&S
5 THERMAL O /L RELAYS --------- L&T/GE/SIEMENS/C&S/Schnieder
6 CONTROL SWITCHES --------- RECOM /KAYCEE/C&S
7 PUSH BUTTONS --------- TEKNIC/VAISHNO
8 INDICATING LAMPS --------- TEKNIC/VAISHNO
9 TIMERS --------- EAPL / L&T / PLA / BCH
10 INDICATING METERS --------- IMP / AE / RISHBH / MECO
11 TERMINALS --------- CONNECTWELL / ELMEX / TOSHA
12 MCB's ---------- MDS /Schnieder/L&T/Hager/SIEMENS/C&S
13 MCCB ---------- L&T/Hager/SIEMENS/C&S
%%%%%%%%%%
DGVCL/SP/1005/Project/Kapodra-Piplod/Technical Specifications
Date
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Signature of the tenderer
Page 132/132
Company’s Round Seal