UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
ST/12/UPG-EXT-ELE-SYS/2011-12
TENDER NOTICE INVITING BID
CLIENT
: National Institute of Nutrition,
Indian Council of Medical Research
Jamai- Osmania PO,
HYDERABAD- 500 604.
Tel : 040-27197200
Fax: 040-27019074
e-mail : nin@ap.nic.in,ninstores@yahoo.com
TENDER TO BE
SUBMITTED ON OR BEFORE
: Till 5.00pm on 09-01-2012
TENDER TO BE
SUBMITTED TO
(HARD COPY)
: The Admin Officer (Stores),
National Institute of Nutrition,
Indian Council of Medical Research
Jamai- Osmania PO,
HYDERABAD- 500 604.
Tel : 040-27197200
Fax: 040-27019074
e-mail :,ninstores@yahoo.com
TENDER WILL BE OPENED
AT
: Technical Bid will be opened on
10-01-2012
List of Attachments to this
Tender Notice
:
1) Salient Features of the Bid
2) Technical Specifications
3) Recommended Makes
4) Tender Schedule (Bill of Quantities)
5) Special Conditions
(Page nos: 2 - 7)
(Page nos: 8 - 63)
(Page nos: 64 -65
(Page nos: 65)
(Page nos: 66 - 71)
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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1.0 SALIENT FEATURES OF THE BID:
1A : DG SET
1. Prices:
Vendors are requested to submit their price bid for supply of 625KVA DG set in the form
of the tender schedule enclosed.
1.1 The price quoted shall be for F.O.R delivery at site at the premises of National
Institute of Nutrition (Inclusive of all Taxes, Duties, Transportation, Customs
and Clearances), for Erection, Testing & Commissioning and handing over the
DG set to the clients/consultant.
1.2 The prices quoted shall be firm and no claim whatsoever due to fluctuations in
the prices of material and labour will be entertained.
1.3 The price quoted shall include Insurance for transit from the manufacturers
works to the site at National Institute of Nutrition and Unloading it on the
existing plinth and handing over the DG set to the client. The risks that are to be
covered under the insurance shall be comprehensive and include the loss or
damage in transit, accidents of all kinds, fire, bad or rough handling etc. And the
scope of such insurance shall cover the full contract value. It is the
responsibility of the supplier to pursue for any claims whatsoever with insurers.
They shall submit their offer separately for Erection, Testing & Commissioning
including Insurance charges for this part.
1.4 The price quoted shall be valid for 120days from the date of opening of the bid.
2. Delivery Schedule:
The vendors are requested to furnish delivery schedule furnishing as to when the DG set
will be ready at their works/factory and offered for the tests to be carried out at the
works/factory as per the technical specifications enclosed and the programme thereafter for
Transport, Erection, Testing & Commissioning and handing over the set.
3. Terms of Payment:
Payment terms shall be as per the clients terms or as agreed during discussions. Conditions
given in Clause-15 of the special conditions will be applicable at different stages.
5. Technical Guaranteed Particulars:
These particulars shall be furnished as per the proforma furnished with the technical
specification. Any other particulars required to be furnished and not mentioned in the
proforma may also be furnished.
6. Warranty & Guarantee:
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Clause 14 of the special conditions is applicable. Minimum guarantee period shall be
One (1) year.
7. Rights Reserved with the Client:
The client/consultant reserves the right to accept or reject any of the bids received without
assigning any reasons therefore.
8. Acceptance of the Bidding Documents:
The vendor is expected to examine all the salient features of this tender notice inviting bids,
technical specifications, special conditions etc and submit his bid in due compliance of
them. Any deviations they may propose may be clearly indicated for consideration and
acceptance or otherwise during negotiations preceding the acceptance and placing of
orders.
1B : TRANSFORMER
1. Prices:
Vendors are requested to submit their price bid for supply of 750KVA Transformer in the
form of the tender schedule enclosed.
1.5 The price quoted shall be for F.O.R delivery at site at the premises of National
Institute of Nutrition, Hyderabad (Inclusive of all Taxes, Duties, Transportation,
Customs and Clearances), for Erection, Testing & Commissioning and handing
over the Transformer to the clients/consultant.
1.6 The prices quoted shall be firm and no claim whatsoever due to fluctuations in
the prices of material and labour will be entertained.
1.7 The price quoted shall include Insurance for transit from the manufacturers
works to the site at National Institute of Nutrition, Hyderabad and handing over
the Transformer to the client. The risks that are to be covered under the
insurance shall be comprehensive and include the loss or damage in transit,
accidents of all kinds, fire, bad or rough handling etc. And the scope of such
insurance shall cover the full contract value. It is the responsibility of the
supplier to pursue for any claims whatsoever with insurers. They shall submit
their offer separately for Erection, Testing & Commissioning including
Insurance charges for this part.
1.8 The price quoted shall be valid for 120days from the date of opening of the bid.
2. Delivery Schedule:
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The vendors are requested to furnish delivery schedule furnishing as to when the
Transformer will be ready at their works/factory and offered for the tests to be carried out at
the works/factory as per the technical specifications enclosed and the programme thereafter
for Transport, Erection, Testing & Commissioning and handing over the set. Date of
commencement of the delivery period will be within 7-days after confirmation and date of
completion shall be 3-months from the date of confirmation.
3. Terms of Payment:
Payment terms shall be as per the clients terms or as agreed during discussions. Conditions
given in Clause-15 of the special conditions will be applicable at different stages.
5. Technical Guaranteed Particulars:
These particulars shall be furnished as per the standards and applicable specifications as
per IS.
6. Warranty & Guarantee:
Clause 14 of the special conditions is applicable, Minimum guarantee period shall be
One (1) year.
7. Rights Reserved with the Client:
The client/consultant reserves the right to accept or reject any of the bids received without
assigning any reasons therefore.
8. Acceptance of the Bidding Documents:
The vendor is expected to examine all the salient features of this tender notice inviting bids,
technical specifications, special conditions etc and submit his bid in due compliance of
them. Any deviations they may propose, may be clearly indicated for consideration and
acceptance or otherwise during negotiations preceding the acceptance and placing of
orders.
1C : 11KV HT PANELS
1. Prices:
Vendors are requested to submit their price bid for supply of 11KV HT PANEL in the form
of the tender schedule enclosed.
1.1 The price quoted shall be for F.O.R delivery at site at the premises of National
Institute of Nutrition, Hyderabad (Inclusive of all Taxes, Duties,
Transportation, Customs and Clearances), for Erection, Testing &
Commissioning and handing over the panel to the clients/consultant.
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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1.2 The prices quoted shall be firm and no claim whatsoever due to fluctuations in
the prices of material and labour will be entertained.
1.3 The price quoted shall include Insurance for transit from the manufacturers
works to the site at National Institute of Nutrition, Hyderabad handing over the
11KV HT PANEL to the client. The risks that are to be covered under the
insurance shall be comprehensive and include the loss or damage in transit,
accidents of all kinds, fire, bad or rough handling etc. And the scope of such
insurance shall cover the full contract value. It is the responsibility of the
supplier to pursue for any claims whatsoever with insurers. They shall submit
their offer separately for Erection, Testing & Commissioning including
Insurance charges for this part. .
1.4 The price quoted shall be valid for 120days from the date of opening of the bid.
2. Delivery Schedule:
The vendors are requested to furnish delivery schedule furnishing as to when the 11KV HT
PANEL will be ready at their works/factory and offered for the tests to be carried out at the
works/factory as per the technical specifications enclosed and applicable IS standards and
the programme thereafter for Transport, Erection, Testing & Commissioning and handing
over the set.
3. Terms of Payment:
Payment terms shall be as per the clients terms or as agreed during discussions. Conditions
given in Clause-15 of the special conditions will be applicable at different stages.
5. Technical Guaranteed Particulars:
These particulars shall be furnished as per the standards and applicable specifications as
per IS.
6. Warranty & Guarantee:
Clause 14 of the special conditions is applicable. Minimum guarantee period shall be
One (1) year.
7. Rights Reserved with the Client:
The client/consultant reserves the right to accept or reject any of the bids received without
assigning any reasons therefore.
8. Acceptance of the Bidding Documents:
The vendor is expected to examine all the salient features of this tender notice inviting bids,
technical specifications, special conditions etc and submit his bid in due compliance of
them. Any deviations they may propose, may be clearly indicated for consideration and
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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acceptance or otherwise during negotiations preceding the acceptance and placing of
orders.
1D : EXTERNAL ELECTRICAL WORKS
1. Prices:
Vendors are requested to submit their price bid for the “ Execution of External
Electrification Package Works” in the form of the tender schedule enclosed.
1.1 The price quoted shall be for F.O.R delivery at site at the premises of National
Institute of Nutrition (Inclusive of all Taxes, Duties, Transportation, Customs
and Clearances), for Erection, Testing & Commissioning to the
clients/consultant.
1.2 The prices quoted shall be firm and no claim whatsoever due to fluctuations in
the prices of material and labour will be entertained.
1.3 The price quoted shall include Insurance for transit from the manufacturers
works to the site at National Institute of Nutrition. The risks that are to be
covered under the insurance shall be comprehensive and include the loss or
damage in transit, accidents of all kinds, fire, bad or rough handling etc. And the
scope of such insurance shall cover the full contract value. It is the
responsibility of the vendor to pursue for any claims whatsoever with insurers.
1.4 The price quoted shall be valid for 120 days from the date of opening of the
bid.
2. Delivery Schedule:
The vendors are requested to furnish delivery schedule furnishing as to when the Panels
will be ready at their works/factory and offered for the tests to be carried out at the
works/factory as per the technical specifications enclosed and the programme thereafter for
Transport, Erection, Testing & Commissioning and handing over.
3. Terms of Payment:
As decided and agreed upon with the clients.
4. Initial Security Deposit, Retention Money, Liquidated damages for delay in delivery etc:
Terms and Conditions given in Clause-15 of the special conditions will be applicable at
different stages.
5. Technical Guaranteed Particulars:
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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These particulars shall be furnished as per the proforma furnished with the technical
specification. Any other particulars required to be furnished and not mentioned in the
proforma may also be furnished.
6. Warranty & Guarantee:
Clause 14 of the special conditions is applicable. Minimum guarantee period shall be
One (1) year from the date of handing over.
7. Rights Reserved with the Client:
The client/consultant reserves the right to accept or reject any of the bids received without
assigning any reasons therefore.
8. Acceptance of the Bidding Documents:
The vendor is expected to examine all the salient features of this tender notice inviting bids,
technical specifications, special conditions etc and submit his bid in due compliance of
them. Any deviations they may propose, may be clearly indicated for consideration and
acceptance or otherwise during negotiations preceding the acceptance and placing of
orders.
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2.0 TECHNICAL SPECIFICATIONS
1A : DG SET
1
SCOPE
1.1
This specification defines the minimum requirements for the supply of self-excited
Internal Combustion Engine driven emergency generator complete with Radiator, Acoustic
enclosure, Air cooled fluid cooler, automatic voltage regulator, control panel, generator
breaker, and other accessories as required.
1.2
Unless otherwise specified the emergency generator shall be supplied complete with
a) Brush less excitation system complete with AVR.
Local control panel with AMF Relay including control cubicle and
associated auxiliary devices, generator breaker, battery and charger.
c) Any other part / accessories not specifically mentioned above but considered
necessary for safe and reliable operation.
2
CODES AND STANDARDS
Unless they are in variance with the clause of this specification the Internal Combustion
Engine driven generator system and its components shall comply with the latest edition of
the applicable standards listed below. For imported electrical equipment corresponding
local codes and standards shall apply.
IS - 2253 Designation for type of construction and mounting arrangement of rotating
electrical machines.
IS - 4691 Degree of protection provided by enclosures of Rotating Electrical Machinery
IS - 4722 Rotating electrical machines.
IS - 4728 Terminal marking and direction of rotation for rotating electrical machinery.
IS - 4889 Methods of determination of efficiency of rotating electrical machine.
IS - 6362 Designation of Methods of Cooling of Rotating Electrical Machines.
IS - 7132 Guide for testing synchronous machines.
IS - 7306 Methods of determining synchronous machines quantities from tests.
IS - 7816 Guide for testing of insulation of rotating machines.
IS - 12065 Permissible limits of noise level for rotating electrical machines.
IS - 12075 Mechanical vibration of rotating electrical machines with shaft heights 56 mm
and higher - measurements, evaluation and limits of vibration severity.
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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IS - 12802 Temperature rise measurement of rotating electrical machines.
IS - 13364 AC Generators driven by reciprocating internal combustion engines.
IS - 13947 Low voltage Switchgear and Control gear : General Rules.
IEC - 34 Rotating Electrical Machines.
The equipment shall also confirm to the provisions of Indian Electricity rules and other
statutory requirements currently in force.
In case of any contradiction between the standards listed above and this specification, the
requirement laid down in this specification shall prevail.
3.
PERFORMANCE REQUIREMENTS
3.1
Site Conditions
Generator shall be suitable for operating satisfactorily in Hyderabad conditions. Generator
rating indicated in the Schedule shall be the net output of the set at specified site conditions
after accounting for all auxiliaries for the prime mover and generator.
3.2
Voltage Regulation
The voltage regulation of the machine shall be within ± 2 % of the nominal
Voltage under following conditions:
3.4
-
Between no load and nominal load with p.f. of 0.8 lag to unity.
-
With the machine cold or warm.
-
At a speed drops of approximately 3% of the nominal speed.
Voltage setting range
The generator terminal voltage shall be adjustable with a continuously variable
potentiometer. The adjustment range shall be ± 10% of the nominal voltage.
3.5
Unbalanced Load
The generator shall be capable of withstanding without injury the effects of a continuous
current unbalance corresponding to a negative - phase sequence current of 8 % of the rated
current for cylindrical rotor machines and 10% for salient pole machines provided none of
the phase current exceeds rated current as per the applicable standards.
3.6
Frequency Limits
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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The generator shall be suitable for continuous operation at rated load for a frequency
variation of ± 3 % of rated value. In addition the vendor shall furnish the short time underfrequency operating limits.
3.7
Over Current Requirement
The generator shall be capable of withstanding without injury stator current of 1.5 pu for 30
seconds and 1.1 p.u. for one hour.
3.8
Short circuit conditions
The generator shall be capable of withstanding with out damage, three phase or a line to
line or line to earth or two line to earth short circuit for a period of 3 seconds when
operating at rated speed and rated load and with an excitation corresponding to 5 % over
voltage.
3.9
Parallel Operation
The Generator sets shall be suitable for parallel operation with other generating sets at
operating voltage and under load conditions up to rated value. (if required)
3.10
Excitation support system
Excitation system shall be provided with short-circuit support equipment (series
compounding) to maintain three times the rated current for three seconds in case of shortcircuit to ensure proper fault clearance in outgoing feeders.
4
DESIGN AND CONSTRUCTION
1. The generator design shall meet the ambient conditions of Hyderabad.
4.2
The generator shall be mounted on a common base frame together with prime
mover unless otherwise agreed. The generator shall be provided with necessary lifting
hooks and two earth terminals on opposite sides for connection to main earth grid.
The generator winding shall be of class ‘H’ insulation with temperature
limitation for class „ H‟. The windings and overhangs shall be braced to
withstand the short circuit forces.
The stator winding shall be star connected and all windings shall be
brought out to six insulated terminals in a terminal box. The terminal
boxes for the line terminals and neutral shall have sufficient space for the
terminals of cable size specified in Schedule. The terminal boxes shall be
complete with lugs and Single compression cable glands.
4.5
All parts and accessories shall be suitable to withstand stresses due to over
speed/overload/short circuit conditions specified.
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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Bearings shall be anti friction, shielded and pre lubricated. Grease in the
bearing enclosure shall provide additional lubrication to bearing as well
as provide sealing against dust and moisture.
The generator shall be air cooled unless otherwise specified. Generator
enclosure shall be as specified in data sheet.
The direction of rotation of the rotor of the machine shall be compatible
with that of the prime mover. A clear indication of the direction of
rotation shall be given on either end of the machine.
4.8
Field winding shall have class ‟H‟ insulation with temperature limitations for ClassH. The field winding shall be capable of operating at a field voltage of 125 % of field
voltage at rated load for at least one minute starting from stabilized temperatures at rated
conditions.
4.9
All cabling on the generator set skid shall be in GI perforated cable trays/ conduits.
All cables shall be identified close to their termination point. Single compression type
cable glands shall be used for cable termination.
4.10 A rating plate of stainless steel shall be fixed on the generator frame and shall give
the information as per IS : 4722.
EXCITATION SYSTEM
The generator shall be provided with brush less type solid state self-excitation system with
automatic voltage regulator. The excitation system shall include the automatic voltage
regulator, AC exciter and rotary rectifier.
All components shall be mounted considering the effects of the centrifugal forces.
Automatic solid state voltage regulator shall be provided with the following features as a
minimum.
Short circuit protection.
-
Manual voltage control
-
Voltage build up circuitry
-
Test mode
6.1.1 Automatic Mains Failure scheme (AMF)
This shall be effective in Auto position of Auto / Manual selector switch located in local
control panel. The generator set shall normally be at rest. Upon failure of normal supply, an
impulse shall be extended from purchaser‟s equipment. Upon receipt of this impulse,
generator set shall start automatically and rated speed and voltage shall be built up. All
accessories required for starting and completion of various sequence of operation for the
above purpose shall be provided as part of DG set. Immediately after this, voltage
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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monitoring relay located in control panel shall extend an impulse for closing generator
breaker. The relay shall also be controllable from PLC and hence necessary control wiring
shall be brought out
6.1.2 Manual Start in service mode
This shall be effective in manual position of Auto / Manual switch and service position of
service / test selector switch located in control panel. The scheme of operation shall be
same as of auto mode as per clause 6.1.1 above except that starting impulse shall be
extended manually through the push button either in local control panel or purchaser‟s
control panel.
6.1.3 Test mode
This shall be effective in test position of service / test selector switch. The scheme of
operation shall be same as that of manual start in service mode as clause 6.1.2 above except
that the closing impulse for generator breaker shall not be extended automatically.
6.2
Shut-down
Unless otherwise specified, stopping the generator set in all cases for a normal shut down
shall only be done manually by means of push button in either local control panel or
purchaser‟s remote panel.
6.3
Starting time
The total time from the receipt of the starting impulse for the generator set till reaches rated
speed and generator reaches rated voltage shall not be more than 30 seconds. If this time is
exceeded, an annunciation in the local control panel shall be provided with a facility for
repeat annunciation in purchaser‟s panel.
7
GENERATOR CONTROL PANEL
7.1
The local generator control panel for the generator set shall comprise of the
following unless otherwise specified in the attached data sheet.
Incoming : 1set of 1250A TPN 50KA EDO ACB
Busbars : 1250A TPN Aluminium busbars @ 0.8A/sq.mm
AMF relay (AVK SEGC make/BE21)
Metering equipments and Indicating instruments such as Digital Voltmeter,
Digital Ammeter, KW Meter and Digital KWH Meter,
d)
Control gear for generator set auxiliaries
Battery charger suitable to charge 2 sets of Batteries for each DG Set
Any other accessory required to make the generator set operational as a package shall be
included in scope of supply. If required the generator control panel shall be split into
various functional sections viz. metering, control, and regulation etc.
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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The generator breaker shall also be part of the control panel unless otherwise specified. The
breaker rating shall be as specified in the Schedule/SLD. This breaker shall serve the
purpose of local isolation. The breaker shall be in draw out execution. In case of 415 V
generators, breaker shall have four poles for isolation of phases and neutral.
All motor starters for DG set auxiliaries if required shall be DOL type in fixed execution
with compartmentalized construction having sheet steel enclosed vertical panels along with
horizontal and vertical bus bars. All bus bars shall be PVC sleeved. Each panel shall have a
separate cable alley.
Unless otherwise specified, the DC control supply required for AMF/local control panel
and for any other purpose shall be met by DC system consisting of battery and battery
charger of suitable capacity to be supplied by the generator set manufacturer.
The battery shall be Sealed Maintenance Free (SMF) type lead acid, high discharge
automotive type suitable for engine starting duty and conforming to relevant IS. The battery
shall be placed on battery stands made of steel with suitable PVC coating. The battery
capacity shall be adequate for three consecutive starts of the engine under cold engine
condition, without recharging, with additional 10 % spare capacity.
The battery charger shall have 3 phase full wave controlled rectifier bridge with their
protective devices. The charger shall be of solid state design, constant voltage type with
current limiting feature suitable for automatic and manual, normal and quick charging of
batteries. The output voltage shall be stabilized to ± 1 % for mains variation of ± 10 % and
load variation of 0 to 100 %. Taps shall be provided on the primary side of the transformer
at ± 5% and ± 10 % rated voltage. A suitable filter circuit shall be provided at the rectifier
output to obtain a smooth DC output voltage. The maximum ripple content in the charger
output voltage shall be lower than the safe value recommended by battery manufacturer and
in any case shall not exceed 5 % with battery disconnected. The charger shall be sized for
boost charging the battery within 10 -14 hours.
The charger shall have auto as well as manual control facility through a lockable selector
switch. In auto mode, the charger shall automatically control the battery charging current
/voltage to ensure optimum boost charging of the battery. After completion of boost
charging, the charger shall switch to float charging mode without any manual intervention.
In the manual mode, it shall be possible to charge the battery at any desired current which is
safe for the battery. Fine control of the output voltage/current shall be possible. In both auto
and manual modes the battery charging current shall be limited to a safe value by means of
adjustable potentiometric control. A backup timer of 0-24 hours range shall be provided for
switching the charger from boost to float mode after the set time, under any mode of
operation.
The charger shall be complete with all interconnections within the panel. All connections
shall be made using 660 V grade PVC insulated wires/ cables with adequately sized copper
conductors for power connections and copper conductor of size 1.5 mm size for control
connections.
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All main and control transformers shall be class H insulated. All semi conductor devices
shall be natural air cooled with absolute case temperature limited to 75 °C at highest load
and ambient temperature. PCB shall be tropicalized to render them immune to dust,
moisture and fungal growth. Auto/ Manual selector switch. ON/OFF switch for incoming
power supply, float/boost selector switch, potentiometer for coarse and fine control of
output voltage and backup timer shall be provided on the front of the panel in addition to
AC incoming voltmeter and ammeter with selector switch and DC output voltmeter and
ammeter. Indication lamps for AC power on (3 lamps) charger in float, charger in boost,
charge failure shall also be provided.
The generator control panel shall be accommodated within the Acoustic enclosure, free
standing, metal enclosed fabricated with cold rolled sheet steel of 2mm thickness, dust and
vermin proof type with a hinged door and having a degree of protection IP 51 unless
otherwise specified. Power and control equipment shall be segregated inside the panel as
far as practicable. The maximum height shall not be more than 2275mm. All hardware
shall be corrosion resistant and bolts, nuts and washers shall be made of galvanized, zinc
passivated or cadmium plated high quality steel. Unless otherwise specified the panel shall
be suitable for bottom cable entry. The Panel shall be powder coated with Siemens grey
after seven tank treatment for sheet
Necessary removable type un drilled gland plate, single compression cable glands and cable
lugs shall be provided with the panel.
All auxiliary devices for control, indication, measurement and alarm such as push button,
control / selector switches, indicating lamps, metering instruments, annunciations etc. shall
be mounted on the front door of the panel. Adequate number of potential free contacts
shall be provided in the control panel for any remote control, monitoring of the generator
set.
All switches shall be load-break, heavy duty type. All fuses shall be non deteriorating HRC
cartridge pressure fitted, link type. The contactors for auxiliary motor starters shall be of
air-break type having AC-3 duty rating. Thermal overload relays shall be three element,
positive acting, ambient temperature compensated type with adjustable setting range and
built in protection feature against single phasing. All indicating instruments shall be
moving iron, flush mounting type and of 72 mm x 72 mm. square pattern. As an option,
vendor may offer digital meters. All control/selector switches shall be rotary back
connected type having a cam-operated contact mechanism with knob type handle „Stop‟
push buttons shall having a cam-operated contact mechanism with knob type handle. „Stop‟
push buttons shall be stay put type.
7.4
Wiring for power, control and signaling circuits shall be done with PVC insulated
copper conductors having 660 V insulation grade. Minimum size of control wires shall be
1.5 mm Clamp type terminals shall be acceptable for wires up to 10 mm size and for
conductors larger than 10 mm bolted type terminals with crimping lugs shall be provided.
A minimum of 10 % spare terminals shall be provided on each terminal block.
7.5
50 x 6 mm Aluminum or equivalent copper earth bus shall be provided in the panel
for connection to the main earth grid. All non current carrying metallic parts of the
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mounted equipments shall be earthed. Doors and movable parts shall be earthed using
flexible copper connections.
Not DefinedEngraved nameplates shall be provided for all devices mounted on the front of
the panel. Nameplate or polyester adhesive stickers shall be provided for each equipment
mounted inside the panel.
8 Diesel Engine:
Diesel Engine shall be suitable for generating set application developing suitable BHP at
1500 RPM, powered by multi cylinder. The engine shall be of heavy duty type suitable for
cold starting and equipped with a minimum of the following accessories.
a) Fly wheel to suit flexible couplings with guard
b) Air cleaner
c) Heat Exchanger with Air Cooled fluid cooler, Pipe lines, Water pumps
d) Fan with guard
e) Water pump-centrifugal type, engine mounted
f) Fuel pump
g) Fuel filter
h) Governor-Electronic type
i) Fuel injection equipment
j) Exhaust silencer (Residential Silencer)
k) Electric starting equipment comprising of starting motor on 24V DC supply
l) Lubricant oil cooler
m) Lubricant oil pump-gear type, engine mounted
n) Lubricant oil filter
o) Turbo charger (exhaust gas driven)
p) Battery charging generator with voltage regulator-24V DC
q) 24V Battery of suitable AH capacity
8.1.1 Instrument panel shall consist of:
a)
b)
c)
d)
e)
f)
g)
h)
I)
Starting switch with key
Lubricating oil temperature gauge
Lubricating oil pressure gauge
Water temperature gauge
Battery charging ammeter
Circuit breaker
Safety control for low lubricating oil pressure
Safety control for high water temperature
Hour meter (mech.) and RPM indicator
The Instruments a to d & I can be mounted on the Engine itself
8.2 Base frame:
The engine alternator shall be perfectly aligned and assembled on a sturdily fabricated
adequately machined base frame, made out of high quality MS channels. The base frame
should be provided with lifting facilities and pre-drilled foundation holes suitable for
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UPGRADATION OF EXTERNAL ELECTRICAL SYSTEM
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installation either on concrete foundation or with anti-vibration mountings.
8.3 Fuel tank:
Separate 990Ltrs capacity Fuel tank capacity for each set with inlet-outlet pipe connections,
filling cap, drain plug level indicator as per manufacturer‟s standards
9. ACCOUSTIC ENCLOSURE:
The Enclosure shall be completely as per CPCB norms and generally consist of a self
supporting frame work built with tubular section and plain or corrugated metallic sheets
and its base shall be built of standard channel section, M.C 100x50, to support the frame
work on its own weight. The base shall be placed on the ground around the DG set without
any foundation or anchor to the ground
The panels, framework, doors and all other surfaces are finished with a rust preventing
primer. The outer surface shall be painted matt finish paint.
The enclosure shall be completely weather proof (IP 55) and is suitable for both indoor and
outdoor application. The DG set Control panel shall be mounted within the enclosure. The
Fuel tank of 990Ltrs capacity shall be located externally.
Performance: The average Noise level at 1mtr from the outer surface of the enclosure shall
be maintained as per CPCB norms The Sound level shall be measured at site using a
calibrated Noise level measuring device, with all noise making loads switched off, in the
presence of Engineer-in-charge.
The Temperature rise inside the enclosure shall not be more than 5Deg.C. Over
ambient temperature. The enclosure shall be supplied by the Agencies with approval
from ARI Pune.
10
TESTS AND INSPECTION
10.1
The purchaser or his authorized Representative may visit the works during
manufacture
of equipment to assess the progress of work as well as to ascertain that only quality raw
materials are used for the same. He shall be given all assistance to carry out the inspection.
10.2 Detailed test procedures along with the facilities available at vendor‟s works shall
be furnished by the vendor.
10.3 Minimum Acceptance tests:
On completion and before handing over of the work, the following tests shall be carried out
by the contractor to the entire satisfaction of the Engineer-in-Charge.
A) Phase-I Test:
i) Insulation resistance test - Sectional and overall
ii) Continuity resistance test-sectional and overall
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iii) Earth resistance test
iv) All instruments and relays shall be tested under normal operating conditions.
v) Visual examination to ensure that the plant equipment and accessories are provided and
the finish and general appearance of the work are as per contract specification.
vi) A no load test for a period of 3 hours continuously to see that the engine, alternator and
other accessories are functioning normally.
The duration of the test may be increased if necessary and as directed by the authorized
representative of the accepting officer.
B) Phase-II Test:
On completion of the Phase-I tests to the entire satisfaction of the authorized representative
of the accepting officer. A load test shall be carried out at factory dispatch as given below.
25% Load
50% Load
75% Load
100% Load
110% Load
:
:
:
:
:
1 hour,
1 hour,
1 hour,
1 hour
10 minutes
Note: Similar tests (If required) to be carried out at site with temporary load banks
(arranged by the supplier) after erection as part of commissioning.
C)
Tests on Alternator
11.
i)
Routine tests for alternator as per IS : 4722.
ii)
Phase sequence test
PAINTING, PACKING AND DESPATCH
11.1 All metal surfaces shall be thoroughly cleaned of scale, rust, and grease etc. Prior to
painting. Cleaned surfaces shall be given two coats of primer and prepared for final
painting. Final finish shall be free from all sorts of blemishes.
11.2 The equipment shall be shipped to site suitably packed to prevent any damage during
transit. Each package shall have labels to show purchaser‟s name, purchase order and
equipment no. Suitable lifting lugs etc. Shall be provided and lifting points shall be clearly
marked on the package. Packing shall be suitable for storage at site for a minimum period
of 6 months.
11.3
Warranty and Maintenance
The installation shall be guaranteed against faulty workmanship for minimum of
One year from the date of practical completion. All faulty workmanship shall be
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replaced and restored to full operation at no cost to the Employer within the
guarantee period.
Manufacturer's guarantees and warranties shall be obtained as agreed. The warranty
period shall be for eighteen months commencing from the date of installation or
twelve months from the date of practical completion, whichever is the first to occur.
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PROFORMA
SCHEDULE OF PARTICULARS AND GUARANTEE ON
DIESEL OIL ENGINE DRIVEN GENERATING SETS
__________________________________________________________________
Item No Description
Particulars
__________________________________________________________________
OIL ENGINE
1.
Maker's Name
2.
Maker's Type
3.
No. and arrangements of cylinders
a) No. of cylinders
b) Arrangement of cylinders
4.
Method of starting
5.
Rated Speed (RPM)
6.
Time required for starting from cold
7.
Type of Governor
8.
Guaranteed limits of governing
a) Permanent variations
i) Full load thrown off
ii) Full load put on
9.
Total speed variation which can be
effected by hand speed regulating gear
10.
Specification of lubricating oil
recommended
11.
Specification of fuel oil recommended
12.
Rated output at normal temperature and
pressure conditions as defined in BS:
649 latest in the case of Diesel
Engine i.e. at 1000 M above mean
sea level and ambient temperature
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13.
14.
15.
16.
above 45degrees C
Overloaded for one hour at standard
operating conditions
Guaranteed output at site (continuous
running for 12 hours under the worst
atmospheric conditions specified in
the schedule of requirements)
Over load for one hour at site
Guaranteed fuel oil consumption
(A) under standard temperature
and pressure (S.T.P)
i) at full rated output (liters/metric horse power/hour
ii) at 3/4 rated output
,,
iii) at 1/2 rated output
,,
(B) at site conditions
i) at full rated output
ii) at 3/4 rated output
iii) at 1/2 rated output
17.
,,
,,
,,
Guaranteed lubricating oil
consumption at full rated output
18.
Mechanical efficiency
19.
Thermal efficiency
Liters
%
%
20.
Details of standard accessories
offered with the engine
21.
Safety protections
a) Whether over speed trip
provided or not
b) Whether low lubrication oil
trip provided or not
22.
Direction of rotation when looking
from engine towards the driven
machine
23.
Whether the engine is 2 stroke
or 4 stroke
24.
Method of aspiration (Eg. natural,
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turbo, or super charged etc.)
25.
Method of cooling
ALTERNATOR
26.
Maker's Name
27.
Maker's type no.
28.
Rated continuous maximum rating
in KVA to BS 2613-57
29.
Rated continuous output in
KW at 0.8 PF
30.
Rated speed (RPM)
31.
Rated voltage
32.
Number of phases
33.
Overload capacity
a) 10 percent for
b) 50 percent for
Hrs
Hrs
34.
Temperature rise of the windings
measured by thermometer after
continuous run at full rated
output, rated voltage, frequency
and PF and with surrounding air
temperature at 45degrees C
(Amb. temperature)
35.
a) Efficiency at 0.8 PF at full load
b) Efficiency at 0.8 PF at 3/4 load
c) Efficiency at 0.8 PF at 1/2 load
36.
Inherent voltage regulation (increase
in voltage from full load to no load
with constant speed and excitation)
37.
38.
39.
Are damper windings fitted on poles ?
Radial clearance between stator and
rotor (air gap)
Peripheral speed of the rotor
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40.
Critical speed of the rotor
41.
Method of lubrication
42.
Direction of rotation
43.
Excitation voltage
44.
Alternator excitation current
at full load on
i) Unity PF
ii) 0.8 PF
45.
Whether DG set is suitable for
Rectifiers/Inverter and computer
type loads ?
46.
What is the maximum motor load
to which the DG set can be used with
DOL Starter?
1B : TRANSFORMER
1.0 POWER TRANSFORMER
1.1.0 General
1.1.1 Scope
The transformer shall be manufactured to the relevant IS specifications.
Scope covers manufacturing, supply, storage, installation, testing and
commissioning of power transformers and associated equipment of required ratings.
1.1.2. Codes and Standards
The design, material, construction, manufacture, inspection, testing and
performance of power transformer shall comply with all currently applicable
standards, regulations and safety codes in the locality where the equipment shall be
installed. The equipment shall also conform to the latest applicable standards and
codes of practice.
In case of conflict between the applicable standards and this specification, this
specification shall govern.
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The transformer shall generally conform to IS 2026 Part 1 to 4 latest edition.
1.1.3 Rating
The Transformer shall be continuously rated for a full load temperature rise not
exceeding 50 deg.C by thermometer in oil and 55 deg.C by resistance method.
1.1.4 Equipment
The transformer shall be complete and also have the following:
.
2mm thick sheet steel enclosure. The housing shall have ventilation
louvers provided with punched steel plate and shall be supplied with
suitable lifting lugs
Primary side cable box with detachable gland plate to suit the number
and size of the XLPE armoured cables specified and with intermediate
disconnecting chamber.
HV cable end box
LV side- Bus duct of 1250A(relative orientation of primary and
secondary side terminals shall be 180 degrees to each other)
Lifting lugs for core and coil assembly
Lifting device for Transformer with enclosure
Eye bolts only for enclosure lifting
Under-carriage haulage with holes
Flat bi-directional rollers with locking arrangement
Marshalling box
Winding temperature Indicator
Earthing Terminals with lugs
Winding Temperature signaliser with communication port as well as
with necessary devices with alarm and trip contact.
Rating and diagram Plate
LV Neutral CT with secondary terminal box in marshalling box
Emergency press to trip and key operable to unlock type push button
located on the Marshalling box.
Maintenance Instructions Manual
1.1.5 Tap Changing Arrangement
The transformer shall be provided with OLTC with 1.25%.
1.1.6 HV Terminal Arrangement
A three pole, one gland cable box, shall be provided suitable to receive one run of
11 KV(E), 3 Core, XLPE earthed, aluminum cable, sized up to 185 Sq.mm.
Heat-shrinkable terminal kits or Raychem sleeves shall be used for HV cable
termination. Suitable cable box: clearances shall be provided.
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Care shall be taken in the installation of cable potheads and Raychem sleeves.
1.1.7 LV Terminal Arrangement
Suitable flange for extending the Bus duct with 1250A Aluminum Busbars shall be
provided.
If additional neutrals are required, these shall be brought out through an Outdoor
Bare Bushing.
1.1.8 General Constructional Features
The Transformer shall be constructed and supplied as per latest standards/
Specifications
1.1.9 Rated Output
The transformer shall:
be capable of delivering the rated current at a voltage equal to 110% of the
rated voltage without exceeding the limiting temperature rise.
be capable of operation continuously, in accordance with the applicable
standard loading guide at its rated kVA and at any of the specified voltage
ratios.
be complete with cable boxes designed and constructed to withstand without
damage, the effects of external short circuits as per the specified Standards.
Account shall be taken of the different forms of system faults that can arise
in service such as line to earth faults and line to line faults associated with
the relevant system and transformer earthing conditions.
The dynamic ability to withstand short circuit shall be demonstrated by tests
or by reference to tests on identical transformers.
All rated parameters such as voltage ratios, impedance, regulation, load
losses, and no load losses subject to the suppliers' guarantees shall be within
the tolerances given in the applicable Standards.
1.1.10 Tests
The tests listed below shall be carried out on the transformer and shall be deemed to
be included in the Contractor's scope.
a.
b.
c.
d.
e.
f.
g.
Routine tests as per IS.
2kV withstand test for all central wiring circuits.
Dimensional Check
Visual
Bushing Creepage Measurement
Vector group
Tan delta (if not included in IS)
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1.2
Data Sheet for 750KVA Transformer
Rating
750KVA (2nos) – OIL COOLED
Installation
OUTDOOR
Type
ONAN - Two Windings
Phase
3 Phase
Primary Voltage
11000V
Secondary Voltage
433 V
Tap changeover
ON LOAD TAP CHANGE with RTCC &
AVR
Tapping on windings HV/LV
HV winding
Winding connection H.V
L.V
Delta
Star grounded
Winding material
Copper
Vector Group
Dyn 11
Percentage Impedance
As per IS
Fault Level HV system
350 MVA
Transformer Neutral:
Effectively earthed through an
Additional bushing on LV side
Transformer Terminations:
1.3
Primary side:
Cable box to suit 3Core 185Sq.mm
11kV XLPE Cable
Secondary side:
Suitable for Aluminum Busduct of 1250A
rating.
Warranty and Maintenance
The installation shall be guaranteed against faulty workmanship for minimum of
One year from the date of practical completion. All faulty workmanship shall be
replaced and restored to full operation at no cost to the Employer within the
guarantee period.
Manufacturer's guarantees and warranties shall be obtained as agreed. The warranty
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period shall be for eighteen months commencing from the date of installation or
twelve months from the date of practical completion, whichever is the first to occur.
1C : 11KV HT PANELS
1.1
General
The Panel shall be metal clad, totally enclosed, rigid, compartmentalized design, floor
mounting, air insulated, extensible, cubicle type, outdoor type in conformity with IP54
protection for use on 11 kV, 3 Phase, 50 Hz system.
The equipment shall be designed for operation in high ambient temperature and high
humidity, tropical atmospheric conditions. Means shall be provided to facilitate ease of
inspection, cleaning and repairs for use in installations where continuity of operation is of
prime importance.
1 .2
Construction
The switchboard shall be:
a.
Of metal enclosed, modular in construction, indoor, floor mounted cubicle type
factory built assembly.
b.
Provided with dust, vermin and damp protection.
c.
Readily extendible as required by the addition of vertical sections after removal of
the end covers.
d.
Only CRCA steel sheets shall be used for fabricating the cubicle.
e.
A removable gland plate with required number of knockout for the cable type and
size shall be provided.
1.3
f.
A base channel of 75 mm shall be provided for the panel.
g.
The thickness tolerance for sheets shall be as applicable in relevant IS.
Metal Treatment And Finish
Generally the treatment and finish of the metal surface shall be as specified in Section
16425, Clause 8.4
1.4
Bus Bars
The bus bars shall be made of high conductivity high strength Aluminum alloy suitable for
11000V, 3 wires, 50 Hz system.
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The bus bars shall be suitably supported with 11 kV insulation mounts, number of supports
and its spacing shall be adequate enough to withstand required short circuit levels.
High tensile bolts and spring washers shall be provided at all bus bar joints. The bus bars
shall have uniform cross section throughout and shall be capable of carrying the rated
current at 11000 V continuously. A current density of 1.24 A/Sq.mm shall not be exceeded
for copper and 0.8 A/Sq.mm for Aluminum bus bars.
Bus bar chamber shall be of air insulated type suitable for an 11000V, 3 Phase, 50 Hz
system.
1.5
HT Switch Gear
HT panel switchboard shall comprise of:
a.
totally enclosed single bus bar
b.
a draw-out type Vacuum Circuit Breaker (VCB) suitable for installation in 3 phase,
3 wire, 50 Hz effectively earthed supply system having fault level of 350 MVA at 11000 V.
The VCB shall be floor mounting, metal clad, indoor, extensible type flush fronted
construction, having a horizontal draw out facility.
The vacuum circuit breaker shall be equipped with:
a.
Housing for circuit breaker carriage
b.
Mechanical interlock and automatic safety shutter gear including padlocking
arrangement
c.
Specified Amperage, 350MVA at 33000 V vacuum circuit breaker with vacuum
interrupters, epoxy support insulators, self-aligning finger type isolating contacts.
d.
Truck having integral racking in device for insertion and withdrawal of VCB
complete with necessary interlocks.
e.
Manually/Electrically (230V, AC) operated spring charging, with closed, tripped,
closed, and open indication.
f.
Mechanical operation counter.
g.
Electrical closing coil of 24Volts DC
h.
Shunt trip coil of 24V DC
i.
Breaker operation auxiliary switch - 4 N/O and 4 N/C
j.
Breaker chamber including a set of 3 phase Amps copper bus bars.
k.
240 volts AC single phase strip heaters, panel lamp and 15/5A switched socket.
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I.
Current transformers chamber incorporating 3 nos, single phase resin cast CTs of
specified ratio with output/accuracy class of 15VA/0.5 per core.
m.
The CTs shall be suitable for short time rating of 18.4 kA for 1 second.
n.
Potential transformer chamber incorporating resin cast PT of ratio 11000/110V and
of suitable burden.
o.
Rear cable termination facility for terminating 11kV XLPE Cable of required size.
p.
Instrument panel fitted with 144 x 144 mm CT operated MISC Ammeter with 3
way and off selector switch, over current and earth fault relay and red and green indicating
lamp, 144 x 144 mm PT operated Voltmeter with selector switch, Frequency and PF
meters.
The switch gear panel shall be complete with all internal wiring and circuit labels.
RMU incoming and outgoing VCB shall have only indicating lamps, but the VCB
connected to the Metering Cubicle shall have the above equipment and auxiliaries.
The VCB at transformer centers shall have 2Nos of over-current plus one No. of earth fault
element relay and other auxiliary relay for transformer protection.
1.6
Storing
The H.T. panel shall be stored in a well-ventilated dry place. Suitable polythene covers
shall be provided for necessary protection against moisture till they are energized.
Erection
The H.T. panel shall be installed over the PCC pedestal in 1:3:6 PCC to a suitable height.
DATA SHEETS
A) SINGLE BREAKER PANEL (OUTDOOR KIOSK TYPE):
1.1 Quantity
: 1 No
1.2 Installation
: OUTDOOR KIOSK TYPE
1.3 Nominal system voltage
: 11 KV, 3 phase
1.4 Highest system voltage
: 12 KV, 3 phase
1.5 System frequency
: 50 Hz +/- 5%
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1.6 Details of neutral earthing
: Solidly earthed
1.7 Rated current
: 630 Amps
1.8 Rated insulation level
: As per standard
1.9 Rated symmetrical short
Circuit breaking capacity
: 350 MVA
1.10 Operating duty
: As per IS: 2516 (part 1
sec.3) or latest revision.
The circuit breaker is not
intended for rapid autore-closing.
O-0.3sec - CO- 3min-CO
1.11 Type of breaker
: VCB
1.12 Closing mechanism
: Motor operated (230V AC)
spring charged electrically
released true trip free
closing mechanism
With 6 NO & 6NC auxiliary
Contacts.
Closing coil : 24V
1.13 Tripping mechanism
: Shunt trip coil suitable for
24V DC.
: Operation counters; space
heater;
1.14 Fittings
.
1.15 Special tools
: Portable hoisting gear
crank for manual
charging of
springs and other tools
required for maintenance.
2. Current Transformers
2.1 Quantity
2.2 Type
2.3 Rated voltage
: As per schedule & Drawing
: Indoor epoxy resin cast.
Type suitable for
Effectively earthed system.
: 11 KV, 3 phase
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2.4 Rated primary current: 100A
2.5 Rated secondary current: 5 Amp.
2.6 No. of secondary : Two - 1 for metering; 1 for Protection
2.7 Rated burden
: 15 VA for each winding
2.8 Insulation level
: As per standards
2.9 Short time current
: 18.4KA.for 1 second rating
: 0.5 – Metering
2.10 Class of accuracy
5 P – Protection
2.11 Reference standard
3.
: IS 2705
Potential Transformers
3.1 Quantity
: 1no
3.2 Type
: Indoor, epoxy resin cast.
3.3 Rated Primary voltage : 11 / SQRT3 KV
3.4 Rated secondary voltage : 110/ SQRT3 V
3.5 No. of windings
: One
3.6 Accuracy class
: 1.0
3.7 Rated burden
: 100 VA for main winding
3.8 Impulse withstand
: As per Standards
3.9 Reference standard : IS: 3156
4. Metering, Protection & Indication
The following shall be provided on the panel
a) Metering:
i/ 1 No. Ammeter, Digital type, suitable for operation from 5Amp. CT secondary, 96 mm
sq. flush mounting. Selector switch shall be provided with each ammeter.
ii/ 1 No. Voltmeter Digital type with selector switch 96 sq. mm flush mounting 0-25
KV.
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iii/ 1 No. Digital Energy meter
iv)/
Power Factor Meter
b) Protections:
i/ 1 No.– Three Element IDMTL Over-current cum Earth Fault Relay (EE Make CDG
31) Horizontal version in flush pattern, draw-out cases.
ii/ Master trip relay type VAJH13 of EE make.
c) Indications
i/ Indicating lamps for ON-OFF position of the circuit breaker.
ii/ Breaker spring charged
iii)/ R , Y , B Indications
iv)/ Trip Circuit Healthy
d) Fault Annunciation (12 Windows)
Suitable scheme shall be provided for annunciating trip & non-trip faults with separate
annunciators and lamps with necessary relays and push buttons for accept & reset. High
speed trip relay type VAJH13 of EE shall be used for tripping circuit breaker.
The general Specifications of the Annunciator are given below.
Face : Translucent Glass / Plastic Window with Engraving
Operation :
a) On Occurrence of Fault : Audible Hooter and flashing of Indication lamp.
b) Acknowledge Button Pressed: Audible hooter and flashing of Indication lamp shall
stop. Indication lamp shall become steady.
c) Reset Button Pressed: If Fault is removed then Indication lamp shall go off
d) Test Button Pressed: All lamps shall Glow.
e) Monitoring: Power supply to Annunciator shall be monitored.
f) Indications: The Indications shall be provided for following
Breaker On/ Breaker Off/ O.C Trip/ E/F Trip
B) 3-BREAKER PANEL (One Incomer and Two Outgoings):
1.1 Quantity
: 1 No
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1.2 Installation
: INDOOR (shall be suitable for extension)
1.3 Nominal system voltage
1.4 Highest system voltage
1.5 System frequency
: 11 KV, 3 phase
: 12 KV, 3 phase
: 50 Hz +/- 5%
1.6 Details of neutral earthing : Solidly earthed
1.7 Rated current
: 630 Amps for Incomer & 400A for Outgoings)
1.8 Rated insulation level
: As per standard
1.9 Rated symmetrical short
Circuit breaking capacity : 350 MVA
1.10 Operating duty
: As per IS: 2516 (part 1
sec.3) or latest revision.
The circuit breaker is not
intended for rapid autore-closing.
O-0.3sec - CO- 3min-CO
1.11 Type of breaker
: VCB
1.12 Closing mechanism
: Motor operated (230V AC)
spring charged electrically
released true trip free
closing mechanism
With 6 NO & 6NC auxiliary
Contacts.
Closing coil 24V DC
1.13 Tripping mechanism
: Shunt trip coil suitable for
24V DC.
1.14 Fittings
:
1.15 Special tools
Operation counters; space heater
Pressure switches for alarm & trip
: Portable hoisting gear
crank for manual
charging of
springs and other tools
required for maintenance.
2. Current Transformers
2.1 Quantity
: As per schedule & Drawing
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2.2 Type
: Indoor epoxy resin cast.
Type suitable for
Effectively earthed system.
2.3 Rated voltage
: 11 KV, 3 phase
2.4 Rated primary current: 100A for incomer,
50A for outgoing to 750KVA Transformer-1
50A for outgoing to 750KVA Transformer-2
2.5 Rated secondary current: 5 Amp.
2.6 No. of secondary
: Two - 1 for metering; 1 for Protection
2.7 Rated burden
: 15 VA for each winding
2.8 Insulation level
: As per standards
2.9 Short time current
: 18.4KA for 1 second rating
2.10 Class of accuracy
: 0.5 - Metering
5 p - Protection
2.11 Reference standard
: IS 2705
3. Potential Transformers
3.1 Quantity
3.2 Type
: 1no
: Indoor, epoxy resin cast.
3.3 Rated Primary voltage : 11 / SQRT3 KV
3.4 Rated secondary voltage : 110/ SQRT3 V
3.5 No. of windings
: One
3.6 Accuracy class
: 1.0
3.7 Rated burden
: 100 VA for main winding
3.8 Impulse withstand
: As per Standards
3.9 Reference standard
: IS: 3156
4. Relays
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4.1 The following shall be provided on the panel.
A) Metering:
i/ 1 No. Ammeter, Digital type, suitable for operation from 5Amp CT secondary, 96 mm
sq. flush mounting. Selector switch shall be provided with each ammeter.
ii/ 1 No. Voltmeter Digital type with selector switch 96 sq. mm flush mounting 0-25
KV.
iii)/
Power Factor Meter
iv)/ 11KV Digital load manager with RS232 protocol, class 1
Accuracy (Make similar to ENERCON) with Mod-bus connectivity
B) Protections
i/ 1 No. - Three Element IDMTL Over-current cum Earth Fault Relay (EE Make CDG
31) Horizontal version in flush pattern, draw-out cases.
ii/ Master trip relay type VAJH13 of EE make.
C) Auxiliary relays (VAX 31)
i/ Suitable relays of EE for tripping with "Auto trip"
Indicating lamp.
ii/ Indicating lamps for ON-OFF position of the circuit breaker.
iii/ Breaker spring charged
iv)/ R , Y , B Indications
v)/ Trip Circuit Healthy
4.2 Fault Annunciation (12 Windows)
Suitable scheme shall be provided for annunciating trip & non-trip faults with separate
annunciators and lamps with necessary relays and push buttons for accept & reset. High
speed trip relay type VAJH13 of EE shall be used for tripping circuit breaker. The general
Specifications of the Annunciator are given below.
i) Face : Translucent Glass / Plastic Window with Engraving
ii)Operation :
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a) On Occurrence of Fault : Audible Hooter and flashing of Indication lamp.
b) Acknowledge Button Pressed : Audible hooter and flashing of Indication lamp shall
stop. Indication lamp shall become steady.
c) Reset Button Pressed : If Fault is removed then Indication lamp shall go off
d) Test Button Pressed
: All lamps shall Glow.
iii)Monitoring : Power supply to Annunciator shall be monitored.
iv) Indications : The Indications shall be provided for following
VCB: Breaker On/ Breaker Off/ O.C Trip/ E/F Trip,
Additionally For Transformer Feeder:
Winding Temp alarm & Trip
C) HT LOAD BREAK SFU PANEL (OUTDOOR KIOSK TYPE):
2.1 The 11KV HT SFU shall be of air break type and the enclosure shall be
suitable for Outdoor application with weather - proof construction. The rating of
SFU shall be 12KV (Maximum) and constructed as per IS 9920/ IEC 265.
The SFU shall be with an enclosure made out of 14SWG MS sheet and painted
with spray painting of approved shade. The Switch shall have provision to fix
11KV HRC Fuses to suit the transformer of 250KVA rating for short circuit
protection.
The switch shall have reliable arc quenching mechanism by a blast of compressed
air, produced by the switch itself, while opening. During the closing position, the
main contacts shall close before the arcing contact ensuring positive making.
Switch shall be equipped with toggle spring closing mechanism to ensure high
closing and opening speed, irrespective of operator‟s skill.
The switch shall have an auxiliary earth switch interlocked with main switch and
a 0020positive indication shall be provided for earth switch ON.
2NO+2NC auxiliary contacts also shall be provided.
2.2 Storing
The H.T. panel shall be stored in a well ventilated dry place. Suitable polythene
covers shall be provided for necessary protection against moisture till they are
energised.
2.3 Erection
The H.T. panel shall be installed over the PCC pedestal in 1:3:6 PCC to a suitable
height.
2.4 Manuals & Guarantee Cards :
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The successful Contractor shall submit all the Operation and Maintenance Manuals for all
Major equipment (in 3 Sets)
1D : EXTERNAL ELECTRICAL WORKS
Chapter 1 POWER CONTROL CENTERS
Chapter 2 MEDIUM AND HIGH VOLTAGE CABLES & ACCESSORIES
Chapter 3 POWER CAPACITORS & CAPACITOR CONTROL PANEL
Chapter 4 LAYING OF CABLES
Chapter 5 EARTHING
Chapter 6 ENERGY SAVER EQUIPMENT
Chapter 7 BATTERY CHARGER
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CHAPTER 1
POWER CONTROL CENTRES
1.0 Scope :
This specification is to cover the requirement of design, supply, installation, testing and
commissioning of LT power control centers / main switch boards with all components,
Instruments, fittings and accessories for efficient operation without any trouble.
2.0 Standards :
The PCC specified herein, unless otherwise stated shall conform to the relevant and latest
revisions of Indian standards and Indian Electricity Rules.
3.0 Design and construction :
3.1 Design requirements : The power control centers shall be suitable for operation on
440volt, 3 phase, 4wire 50HZ system to withstand a short circuit level of 50 KA RMS
symmetrical.
The PCC shall be designed for operation in high ambient temperature up to 45 degrees
centigrade and high humidity up to 95% and tropical atmospheric conditions. Means shall
be provided to facilitate ease of inspection, Maintenance and Servicing.
3.2 Constructional requirements :
The power control center shall be of
i) Metal clad, cubicle, indoor, free standing type suitable for Mounting on Built up
Trenches with U Channels of adequate size.
ii) Made up of the requisite vertical sections, which when coupled together shall form
continuous dead front switch board.
iii) Dust and damp protected, the degree of protection shall be better than IP - 54 as
specified in IS-2147, if specified in schedule
iv) Readily extendable on both sides by the addition of vertical sections after removal of
the end covers.
v) Single front construction with the circuit breaker feeder and switch fuse feeders suitable
for operation from the front of the panel.
The PCC shall have the feeder ratings as per the schematic diagrams enclosed with the
schedule and constructed only of materials capable of withstanding the mechanical,
electrical and thermal stresses as well as the effects of humidity, which are likely to be
encountered in normal service.
3.3 Vertical Sections :Each vertical section shall comprise a front framed structure rolled
folded sheet steel channel section of minimum 2 mm thickness rigidly bolted together. This
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structure shall house the components contributing the major weight of the equipment such
as circuit breaker, switch fuse units, main horizontal bus bars, vertical risers and other front
mounted accessories. The structure shall be mounted on a rigid base frame of folded sheet
steel of minimum of 2.5mm thickness and 100mm height. The design shall ensure
Structural stability during Transit and also during Operation after Commissioning Suitable
cable chamber housing the cable end connections and power / control cable terminations
shall be provided. The design shall ensure generous availability of space for ease of
installation and maintenance of cabling and adequate safety for working in one vertical
section without coming into accidental contact with live parts in the adjacent section.
A cover plate at the top of the vertical section shall be provided with necessary ventilating
arrangements. Any aperture for ventilation shall be covered with a perforated sheet having
less than 1 mm diameter perforations to prevent entry of vermin.
3.4 Sheet Steel Cubicle :
3.4.1 The sheet steel cubicle shall be designed in fully segregated multi tier formation.
Each cubicle shall have hinged front access door with easy operating fasteners. All the
doors and covers shall be heavily gasketed to make the compartment dust tight. Each
cubicle shall have a covering at the bottom to make a dust and vermin proof construction.
Door hinges shall be of concealed type.
The cubicle shall be of minimum 2 mm thick sheet steel. Sheet steel shrouds and partitions
shall be of minimum 1.6 mm thickness. All sheet steel work forming the exterior of switch
boards shall be smoothly finished, leveled and free from flaws. The corners shall be
rounded. The minimum Thickness of Gland plates shall be 3mm.
3.4.2 The apparatus and circuits in the power control centers shall be so arranged as to
facilitate their operation and maintenance at the same time to ensure the necessary degree
of safety.
Apparatus forming part of the control centers shall have the following minimum clearance.
i) between phases - 25 mm,
ii) between phase and neutral - 25 mm,
iii) between phases and earth - 25 mm,
iv) Between neutral and earth - 19 mm,
When, for any reason, the above clearances are not available suitable insulation shall be
provided. Clearance shall be maintained during normal service conditions. Creepage
distances shall comply with those specified in relevant standards.
3.4.3 All insulating materials used in the construction of the equipment shall be non
hygroscopic duly treated to withstand the effect of high humidity, high temperature and
tropical ambient service conditions.
3.4.4 Functional units such as circuit beakers and fuse switches shall be arranged in
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multitier formation, except that not more than One air circuit breaker housed in a single
vertical section.
3.4.5 Metallic/insulated barriers shall be provided within vertical sections and between
adjacent sections to ensure prevention of accidental contact with :
i) Main busbars and vertical risers during operation, inspection or maintenance of
functional units and front connected accessories.
ii) Cable terminations of one functional unit, when working on those of adjacent unit/units.
3.4.6. All doors /covers providing access to live power equipment /circuits shall be
provided with tool operated fasteners to prevent unauthorized access.
3.4.7 Provisions shall be made for permanently earthing the frames and other metal parts
of the switchgear by two independent connections. The earth connections shall be extended
to the bases of SFUs
3.5 Metal treatment and finish :
All steel works used in the construction of the switch boards shall have undergone a
suitable rigorous metal treatment process so as to remove oxide scales and rust formation
and to facilitate a durable coating of the paint on the metal surfaces and also to prevent the
spreading of rust, in the event of the paint film being mechanically damaged.
Two coats of Anti Corrosive primer followed by a finishing coat of Epoxy powder coating
of the shade 631 of IS : 5 (ie Siemens grey) shall be given. The total thickness of paint shall
not be less than 25 micron.
3.6 Bus Bars :
3.6.1 The busbars shall be housed in non-segregated sheet steel compartments in the
cubicle at convenient locations with provision for access to the buses from the front of the
panel. The busbar shall be suitably braced with DMC/SMC supports to provide a through
fault withstand capacity of 50 KA RMS symmetrical for one second and a peak short
circuit withstand capacity 150 KA minimum. The neutral as well as the earth bus shall be
capable of withstanding the above fault level.
3.6.3 Large clearance and creeping distance shall be provided on the busbar system to
minimise the possibility of a fault.
3.6.4 High tension bolts, nuts and spring washers shall be provided at all busbar joints.
3.6.5 The continuous rating of the bus bar shall be 0.8A/sq.mm. Maximum temperature of
the bus and the connections shall not exceed 85 degrees centigrade. The busbars shall be of
liberal design The main phase busbars shall have continuous current rating through out the
length of each power control center and the neutral busbars shall have continuous rating of
at least 50% of phase busbars.
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3.6.6 Connections from the main busbars to functional circuits shall be arranged and
supported so as to withstand without any damage or deformation, the thermal and dynamic
stresses due to short circuit currents.
All busbars and tappings shall be provided with colour coded heat shrinkable sleeves for
phase identification.
All joints/tapping points of the buses shall be suitably shrouded to prevent accidental
contact.
4.0 Air Circuit Breakers :
4.1 General :
4.1.1 Circuit breakers shall be of triple pole / four pole, air break, horizontal draw out
/Fixed type, as given in the schedule of work and comply with the requirements of relevant
IS with latest amendments confirming to IS-13947/1&2 and shall have conform to Isolation
standard and shall have the following:
i) A short circuit breaking capacity (Ies r.m.s of not less than 50 KA RMS at 500 volts, 50
Hz AC.
ii) A short circuit making capacity (Iem peak) of 105 KA.
iii) Rated ultimate short circuit breaking capacity, (Ieu r.m.s) of 105 kA
iv) A short time withstand capacity (Iew of 150 KA for one second.
v) Electrical overload performance at 6 times the rated current, 100% of the rated voltage
as recovery voltage at 0.5 power factor.
vi) Dielectric test of 2.5 KV applied for one minute on main circuits.
4.1.2 The circuit breakers shall be fitted with detachable arc chutes on each pole designed
to permit rapid dispersion, cooling and extinction of the arc. Inter phase barriers shall be
provided to prevent flash over between phases.
4.1.3 Arcing contacts shall be of hard wearing material copper tungsten or silver tungsten
and shall be easily replaceable. Main contacts shall be of silver plated copper of high
pressure type and generous cross section.
4.2 Operating Mechanism :
The operating mechanism shall be of robust design, with minimum number of linkages to
ensure maximum reliability. Manually operated circuit breakers shall be provided with
spring operated closing mechanism which are independent of speed of manual operation.
Electrically shall be independent of the motor which shall be used slowly for charging the
closing spring.
The operating mechanism shall be such that the breaker is at all times free to open
immediately when the trip coil is energized.
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Mechanical operation indicators shall be provided to show open and close positions of the
breaker. Electrically operated breakers shall be additionally provided with mechanical
indications to show charged and discharged conditions of the charging spring.
Means shall be provided for slow closing and opening of the breaker for maintenance
purposes and for manual changing and closing of electrically operated breakers during
emergencies,
4.3 Protection :
Provisions shall be available for fitting a minimum of five trip devices - three over current,
as shunt trip and an under voltage release or two over current and earth fault release, a
shunt trip and one under voltage release. The breakers shall be of the shunt or series trip
type as specified in the schedule.
The protection release must be Electronic /Micro Processor based, True RMS sensing
compatible to EMC and with a provision of malfunctioning indications.
Following setting must be available on the relay :
i) Over current setting(Ir )
70% to 100% of In
ii) Short circuit setting (Id) 1.25 to 10 of Ir
4.4 Housing of Circuit Breaker :
Circuit breakers shall be individually housed in sheet metal castle provided with hinged
doors. The breaker along with its operating mechanism shall be mounted on a robust
carriage moving on guide rollers with in the castle. Isolating contacts for both power and
control circuits shall be of robust design and fully self aligning. The assembly shall be
designed to allow smooth and easy movement of the breakers within its castle.
The breaker shall have three distinct positions within the castle as follows :
i) `Service' position : With main and auxiliary contacts connected.
ii)`Test' position : with power contacts fully disconnected and control circuit contacts
connected.
iii) `Isolated' position : with both power and control circuit contacts fully disconnected.
It shall be possible to achieve any of the above positions with the castle doors closed.
Mechanical position indicators shall be provided for the three positions of the breakers.
4.5 Interlocking :
4.5.1. The moving portion of the circuit breaker shall be interlocked so that :
i) It shall not be possible either to isolate it from the connected position, or to plug it in
from the isolated position with the breaker closed.
ii) The circuit breaker can be closed only when it is in one of the three positions or when it
is fully out of the castle.
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iii) It shall not be possible to open the hinged door of the castle unless the breaker is drawn
to the isolated position.
iv) Inadvertent withdrawal of the circuit breaker too far beyond the supporters is prevented
by the suitable stops.
4.5.2 Provisions shall be available for the padlocking of the circuit breaker accessible in
any of the three positions.
4.5.3 Automatically operated safety shutters shall be provided to screen the fixed isolating
contacts when the breaker is drawn out from the castle.
4.5.4 The moving portion of the circuit breaker shall be provided with a heavy duty, self
aligning earth contact, which shall make before and break after the main isolating contacts
during insertion into withdrawal from the service position of the breaker. Even in the
isolated position positive earthing contact should exist.
4.5.5 Auxiliary switches directly operated by the breaker operating mechanism and having
4 `NO' and 4 `NC' contacts, shall be provided on each breaker. The auxiliary switch
contacts shall have a minimum rated thermal current of 10 amps.
5.0 Switch Fuse Units :
5.1 General :
The switch fuse units shall be of the load break, heavy duty, cubicle type conforming to the
requirements IS and of AC 23 duty.
The switch fuse units shall be capable of withstanding the thermal and electromagnetic
stresses caused by short circuits for the time of operation of the associated fuse links.
The switch fuse units shall be double break and have quick make break mechanism,
designed to ensure positive operation.
All switch fuse contacts shall be silver plated at the current transfer surfaces.
The unit shall be provided with a front operating handle. The ON and OFF positions of the
switch handle shall be clearly marked.
5.2 Interlocks and Safety :
Interlocks shall be provided so as to prevent opening of the unit door when the switch is in
the ON position and also to prevent closing of the switch with the door not properly
secured. It should however be possible for a competent person to operate the switch shall
be suitable for locking with switch in the OFF position by means of a padlock.
The interior arrangement of the switch fuse unit shall be such that all 'Live' parts are
shrouded.
5.3 HRC Fuses :
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The switch fuse units shall be fitted with High rupturing capacity cartridge fuse links with
ISI marking for a rupturing capacity of not less than 80 KA at 415 volts. The fuse links
shall be mounted in a drawout carriage, thus ensuring positive isolation of contacts during
fuse replacements.
6.0 Moulded Case Circuit Breakers (MCCBs)
6.1 If specified in the BOQ, MCCB‟s shall be provided in the switchboards for the circuit
protection. MCCBs rating shall be as indicated in the switchboard data sheet.
6.2 MCCB shall be of triple pole /four pole as given in the schedule of work and comply
with the requirements of relevant IS with latest amendments confirming to IS 13947/1&2
and shall confirm to isolation standard and shall have the following
Rated ultimate short circuit breaking capacity (Ieu r.m.s) of not less than 20 KA
RMS at 415 volts, 50 Hz Ac.
Rated short circuit breaking capacity upto 600V DC (Ics) of 20KA.
6.3 MCCB shall be provided with adjustable type overload (80-100% of In) and S.C.
setting of 2 to 10times of Ir tripping device with inverse time characteristics for over load
protection and instantaneous characteristics for short circuit protection.
The protection release must be Thermal magnetic/Electronic /Microprocessor based, True
RMS sensing, inbuilt with adjustable threshold and time delay, compatible to EMC and
with a provision of malfunctioning indications.
6.4 MCCBs shall be provided with spring assisted quick make/break manually operated trip
mechanism. Wherever specified, MCCB shall be suitable for remote tripping operation and
the tripping device shall be suitable for the specified control supply voltage.
6.5 „ON‟ and „OFF‟ position of the operating handle of MCCB shall be displayed and the
operating handle shall be mounted on the door of the compartment housing.
If specified in the data sheet, the MCCBs shall be provided with solenoid /Motorized
closing solenoid /motor shall be suitable for specified control supply voltage.
Wherever specified in the schedule, the MCCB shall be provided with Earth leakage
relays. However all MCCBs whether specified or not shall have shout trip device.
Earth Leakage Relays:
Not DefinedThe Earth Leakage relays shall be static type .
Not DefinedThe ELR shall have variable Current sensitivity and Tripping time to
0.15-3.0 seconds
Not DefinedThe unit shall be flush mounting type
Not DefinedThe unit shall have an LED for visual fault indication
Not DefinedThe input voltage shall be 440V AC 50Hz
Not DefinedThe core Balance CT shall be of cast Resin type size as required
Not DefinedThe unit shall have built in 1NO +1NC potential free contacts.
Not DefinedThe contact rating shall be 6A/230V AC
Not DefinedThe current rating shall be suitable for Temp range of 0-50DegC
Not Defined The Breakdown Voltage of the unit shall be 2KV for one Minute
Not Defined The Unit shall be of 96X96 mm size
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Current Transformers.
Current transformers shall comply with the requirements of relevant latest IS. They shall
have ratios, outputs and accuracy as specified in the schedule.
9. Indicating / Integrating Meters :
All indicating instruments shall be of flush mounted industrial pattern conforming to the
relevant latest amended IS. The instrument shall have non reflecting bezels, clearly, divided
and indelibly marked scales, and shall be provided with zero adjusting devices in the front.
Integrating instruments shall be of flush mounted switch board pattern complying with the
requirements of relevant latest IS.
10.0Control switches/Selector switches : Control switches/Selector switches shall be of the
heavy duty rotary type, with plates clearly marked to show the operating position. They
shall be of semi-flush mounted type with only the front plate and the operating handle
projected.
Circuit breakers control switches shall be of the spring return to neutral type.
11.0 Indicating lamps and push buttons :
Indicating lamps shall be of the LED type of low watt consumption, provided with series
resistors where necessary and with translucent lamp covers. Bulbs and lenses shall be easily
replaceable from the front.
Push buttons shall be of the momentary contact, push to actuate type fitted with self-reset
contacts and provided with plates marked with its junctions.
12.0 Cable terminations :
Cable entries and terminals shall be provided in the switch board to suit the number, type
and size of aluminum conductor power cables and copper conductor control cables as
indicated in the schematic diagram.
Provision shall be made for top or bottom entry of cables as required. Generous size of
cabling chambers shall be provided, with the position of cable glands and terminals such
that cables can be easily and safely terminated.
Barriers or shrouds shall be provided to permit safe working at the terminals of one circuit
without accidentally touching that of another live circuit.
Cable riser shall be adequately supported to withstand the effects of rated short circuit
currents without damage and without causing secondary faults.
Cable sockets shall be of Bimetallic crimping type.
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13.0 Control wiring : All control wiring shall be carried out with 1100/650 V grade single
core Copper cable conforming to relevant IS having stranded copper conductors of
minimum 2.5 sq.mm section for CT Circuit and 1.5sq.mm for other Control wiring.
Wiring shall be neatly bunched, adequately supported and properly routed to allow easy
access and maintenance.
Wires shall be identified by numbered ferrules at each end. The ferrules shall be of the ring
type of non-deteriorating material. They shall be firmly located on each wire so as to
prevent free movement.
All control circuit fuses shall be mounted in front of the panel and shall be easily
accessible.
14.0 Terminal blocks and labels :
Terminal block shall be of 500 volts grade of the stud type.
Insulating barriers shall be provided between adjacent terminals.
Terminal block shall have minimum current rating of 10 amps and shall be shrouded.
Provisions shall be made for label inscriptions.
Labels shall be made of anodized aluminum, with white engraving on black background.
They shall be properly secured with fasteners. Danger plate of size and descriptions as
recommended in the relevant IS shall be provided on the PCC.
15.0 Tests :
i) The power control center shall be completely assembled, wired, adjusted and tested for
operation under simulated conditions to ensure correctness of wiring and interlocking and
proper functioning of all components.
ii) Each power control center and components shall be subjected to standard routine tests as
per applicable clauses of relevant standards.
iii) All current carrying parts and wiring of power control center shall be subjected to
power frequency voltage withstand test.
16.0 Drawings : After the award of the contract, the contractor shall submit three copies
of the following drawings for approval of the Department.
i) Outline dimensional drawing of the PCC showing the general arrangement indicating the
following :
a) Busbar clearances;
b) power and control cable entry points;
c) Configuration of busbars;
d) Details of support insulations and spacings;
e) Outgoing power cable termination arrangements.
ii) Single line diagram of power control centre showing Protection, Metering etc.
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iii) Cubicle wiring diagram.
iv) List of Fitments with Ratings & makes / Models
17.0 Installation Testing and commissioning :
The power control centre shall be installed over the cable trench/ cable pit using suitable
size of MS channel including grouting of the channel with necessary bolts and nuts. Proper
earthing of PCC shall be done using two independent copper/ GI strip of sizes as indicated
in the schedule. The channel shall be painted with one coat of red oxide primer and two
coats of anticorrosive enamel paint of proper shade as directed by the Engineer-in-charge.
The pre-commissioning tests as required shall be done and the PCC shall be commissioned.
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CHAPTER 2
MEDIUM AND HIGH VOLTAGE CABLES
& ACCESSORIES
1.0
SCOPE
This specification along with data sheets covers requirements for design,
manufacturer and supply of PVC /XLPE cables and cable jointing / terminating
accessories for high voltage systems.
2.0 STANDARDS
The cables shall comply with the latest edition of the following standards as applicable:
2.1
IS : 1554
PVC insulated (heavy duty) electric cables.
2.2
IS : 7089
Cross-linked polyethylene insulated PVC sheathed cables.
2.3
IS : 8130
Conductors for insulated electric cables and flexible cords.
2.4
IS : 5831
PVC insulation and sheath of electric cables.
2.5
IS : 3975
Mild steel wires, strips and tapes for armouring of cables.
2.6
10810(part - 41)
Methods of test for cables : Mass of zinc coating on steel
armour
2.7
IS : 209
Specification for zinc.
2.8
IS : 3961(Pt-2)
Recommended current ratings for cables: Part - 2 PVC
insulated and PVC sheathed heavy duty cables.
2.9
IS : 10418
Drums for electric cables.
2.10
IS : 10462(Pt-1)
Fictitious calculation method for determination of
dimensions of protective of cables: Part - 1 Elastomeric and
Thermoplastic insulated cables.
2.11
IS : 10810(Pt-58)
Method of test for cables: Part 58 Oxygen Index test.
2.12
IS : 10810(Pt61)
Method of test for cables:Part 61Flame retardant test.
2.13
IS : 10810(Pt 62)
Method of test for cables: Part 62 Fire retardance test for
Bunched cables.
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2.14
IEC : 332-2
Tests on electric cables under fire conditions.
2.15
IEC : 540& 540A
2.18
ASTM: D2863
Test methods for insulation and sheaths of electric cables
and cords.
Standard method of test for Flammability of plastics using
oxygen index method The cables and accessories shall also
conform to the provisions of Indian Electricity Rules and
other statutory regulations, as applicable.
3.0
GENERAL CONSTRUCTION
3.1 The cables shall be suitable for laying in trays, trenches, ducts, and conduits
and for underground buried installation with uncontrolled backfill and possibility of
flooding by water and chemicals.
Outer sheath of all PVC and XLPE cables shall be black in color and the
minimum value of oxygen index shall be as per IS. In addition suitable
chemicals shall be added into the PVC compound of the outer sheath to
protect the cable against rodent and termite attack.
3.3 Sequential marking of the 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.
3.4 The overall diameter of the cables shall be strictly as per the values declared in
the technical information furnished along with bids subject to a minimum tolerance
of 2 mm upto overall diameter of 60 mm and 3 mm for beyond 60 mm.
3.5 PVC / Rubber end caps shall be supplied free of cost for each drum with a
minimum or eight per thousand meter length. In addition, ends of the cables shall
be properly sealed with caps to avoid ingress of water during transportation and
storage.
3.6 The cables used in installations under the jurisdiction of Director General of
Mines and safety shall be of copper conductor only.
3.7 The vendors shall specifically note that any of the make of cable accessories
listed in data sheet will be used for termination or jointing of the cables offered.
3.8
PVC Cables
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3.8.1 All power/ control cables for use on medium voltage systems shall be heavy
duty type, 650/1100 V grade with aluminum / copper conductor, PVC insulated,
inner sheathed, armoured and overall PVC sheathed.
3.9.2 The conductor shall be solid for conductor of nominal area upto and
including 6 mm and stranded beyond 6mm. Conductors of nominal area less than
25 sq.mm shall be circular shaped. Cables with reduced neutral conductor shall
have sizes as per Table 1 of IS 1554(part - 1).
3.9.3 The core insulation shall be with PVC compound applied over the conductor
by extrusion and shall conform to the requirements 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 Arabic numerals on the
outer surface of the insulation. Color of the numbers shall contrast with the color of
insulation with a spacing of maximum 50 mm between two consecutive numbers.
Color coding for cables upto 5 cores shall be per Indian Standard.
3.9.4
Part -1. Single core cables shall have no inner sheath.
3.9.5 If armouring is specified for multicore cables in the data sheet, the same
shall be by single round galvanised steel wires where the calculated diameter
below armouring does not exceed 13 mm and by galvanised steel strips where this
dimension is greater than 13 mm. Requirement and methods of tests for armour
material and uniformity of galvanisation shall be as per IS - 3975 and IS - 10810
(Part 41). The dimensions of armour shall be as per methods (b) of IS - 1554
(part-1). If armouring is specified for single core cables in the data sheet, the same
shall be with H4 grade hard drawn aluminum round wire of 2.5 mm diameter.
The combined conductance of armour for mining cables shall be equivalent to
75% of the conductance of the largest conductor of the cable.
3.9.6 The outer sheath for the cable 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 IS: 1554 (Part- 1) for
unarmoured and armoured cables.
3.10
XLPE Cables
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3.10.1 Power cables for 3.3 KV upto and including 33 KV system shall be
Aluminum/ copper conductor, XLPE insulated, sheathed, armoured and overall
PVC sheathed.
3.10.2
The conductors shall be stranded and compacted circular all cables.
3.10.3 All cables rated 3.8 / 6.6 KV and above shall be provided with both
conductor screening and insulation screening. The conductors shall be provided
with non-metallic extruded semi conducting screen.
3.10.4 The core insulation shall be with cross linked polyethylene insulating
compound dry cured, applied by extrusion. It shall be free from voids and shall
withstand all mechanical and thermal stresses under steady state and transient
operating conditions. It shall conform to the properties given in Table - 1 of IS :
7098 (part -2).
3.10.5 The insulation screen shall consist of non-metallic extruded semiconducting compound in combination with a non-magnetic metallic copper screen.
Unless specified otherwise, the copper screen for all the three cores together shall
be capable of carrying the single line into ground fault current value and the
duration specified in the data sheet. Vendor shall furnish calculation in support of
selection of the size of copper screen along with bids.
3.10.6 The conductor screen, XLPE insulation screen shall all be extruded in one
operation by ‘Triple Extrusion’ process to ensure perfect bonding between the
layers. The core identification shall be by coloured strips or by printed numerals.
3.10.7 The inner shall be applied over the laid up cores by extrusion and shall conform to
the requirements of type ST 2 compound of IS: 5831. The extruded inner sheath shall be of
uniform thickness. In case of single core cables, there shall be extruded inner sheath
between insulation metallic screen and armouring.
3.10.8 For multicore cables, the armouring shall be by galvanised steel strips as per
method (b) IS - 7098 (part-2). If armouring is specified for single core cables in the data
sheet, the same shall be with H4 grade hard drawn aluminium round wire of 2.5 mm
diameter.
3.10.9 The outer sheath of the cables shall be applied by extrusion over the armouring and
shall be of PVC compound conforming to the requirements of Type ST 2 compound of IS :
5831. The thickness of outer sheath shall be as per IS : 7089 - part 2 for both unarmoured
cables.
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3.10.10 The dimensions of the insulation, inner sheath shall be governed by values given in
IS : 7098 Part - 2.
3.10.11 Where specified, 1100 V grade power cables may also be XLPE insulated and shall
meet the requirement specified in IS - 7098(Part- 1).
4.0
CABLE ACCESSORIES
4.1
The termination and straight through jointing kits for use on the systems shall be
suitable for the type of cables offered as per this specification.
4.2
The accessories shall be supplied in kit form. Each component of the kit shall carry
the manufacturer‟s mark of origin.
4.3
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.
4.4
The contents of the accessories kit including all consumable shall be suitable foe
storage without deterioration at a temperature of 45 C, with shelf life extending to more
than 5 years.
4.5
Terminating kits: The terminating kits shall be suitable for termination of the cables
to an indoor switchgear or to a weather- proof cable box of an outdoor mounted
transformer / motor. For outdoor terminations, weather shields / sealing ends and any other
accessories required shall also form part of the kit. The terminating kits shall be form one
of the makes / types mentioned in the data sheet.
4.6
Jointing Kits : The straight through jointing kits shall be suitable for the installation
on overhead trays, concrete lined trenches, and ducts and for underground burial with
uncontrolled backfill and possibility of flooding by water and chemicals. These shall have
protection against any mechanical damage and suitably designed to be protected against
rodent and termite attack. The inner sheath similar to that provided for cables shall be
provided as part of straight through joint. The jointing kits shall be from one of the makes /
types mentioned in the data sheet.
5.0
TESTING AND INSPECTION
The cables shall be tested and inspected 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 PURCHASER/ Owner. Manufacturer
shall furnish all necessary information concerning the supply to PURCHASER/ owner‟s
inspectors. The inspector shall have free access to the manufacturer‟s works for the purpose
of inspecting the process of manufacture in all its stages and he will have the power to
reject any material which appears to him to be of unsuitable description or of unsatisfactory
quality. The vendor shall give at least 4 weeks advance notice to the purchaser, regarding
the date testing to enable him or his representative to witness the tests.
5.1 PVC & XLPE Cables
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5.1.1 After completion of manufacture of cables and prior to dispatch, the cables shall be
subjected to type, routine, acceptance and special tests as detailed below. PURCHASER /
Owner 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.
5.1.2 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
Part - 2.
5.1.3 The inner and outer sheath of XLPE cables shall be subjected to all the tests
applicable for OVC cables. The test requirements for insulation and sheath of PVC cables
shall be as per latest revision of IS : 5831.
5.2
Cable Accessories
Type tests should have been carried out to prove the general qualities and design of a given
type of termination/ jointing system as per IS - 13573. The type test certificates shall be
submitted along with offer. In case type test certificates are older than 5 years, vendor shall
carry out the type test at his own cost.
6.0
PACKING AND MARKING
6.1
Cables shall be dispatched in non-returnable wooden or returnable steel 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.
6.2 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 rotation of the drum.
6.3 Unless otherwise specified, Cables shall be supplied in drum lengths as follows:
Medium voltage power cables upto and including 6 sq.mm -1000m Medium voltage power
cables from 10 sq.mm upto and including 300 sq.mm -500
Control cables upto and including 27 cores.
-1000m
HV Power cables Upto 11 KV (E) grade, 3 x 400 mm
- 500m
Upto 11 KV (E) grade, 1 x 630 mm
- 1000m
A tolerance of plus or minus 3 % shall be permissible for each drum. However overall
tolerance on each size of cable shall be limited to 2%. Offers with short /non -standard
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lengths are liable for rejection. If non-standard drum lengths are specified in the data sheet,
the same shall be supplied.
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CHAPTER 3
POWER CAPACITORS & CAPACITOR CONTROL PANEL
1.General
a) The capacitor banks shall be complete with all parts that are necessary or essential for
efficient operation. Such parts shall be deemed to be within the scope of supply
whether specifically mentioned or not.
b) The capacitor bank shall be complete with the required capacitors along with the
supporting post insulators, steel rack assembly, copper busbars, copper connecting
strips, foundation channels, fuses, fuse clips, etc. The steel rack assembly shall be
hot dip galvanised.
c) The capacitor bank may comprise of suitable number of single phase units in seriesparallel combination. However, the number of parallel units in each of the series
racks shall be such that failure of one unit shall not create an over voltage on the
units in parallel with it, which will result in the failure of the parallel units.
d) i. The assembly of the banks shall be such that it provides sufficient ventilation for each
unit.
ii Each capacitor case and the cubicle shall be earthed to earth bus.
e) Each capacitor unit/bank shall be fitted with directly connected continuously rated, low
loss discharge device to discharge the capacitors to reduce the voltage to 50Volts
within one minute in accordance with the provisions of the latest edition of IS:2834.
f) Capacitors shall be of MPP type with internal element fuses completely impregnated type
non PCB oil.
g) Each unit shall satisfactorily operate at 135% of rated KVAR including factors of over
voltage, harmonic currents and manufacturing tolerance. The units shall be capable
of continuously withstanding satisfactorily any over voltage up to a maximum of
10% above the rated voltage, excluding transients.
h) Capacitors shall have built in surge suppression coils.
i) The Capacitor Banks shall be suitable for Operation with Automatic relays.
j) The capacitors shall be rated for 500V and connected in Delta.
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2. Unit Protection:
Each capacitor unit shall be individually protected by a HRC fuse suitably rated for load
current and interrupting capacity, so that a faulty capacitor unit shall be
disconnected by the fuse without causing the bank to be disconnected. Thus, the
fuse shall disconnect only the faulty unit and shall leave the rest of the units
undisturbed. An operated fuse shall give visual indication so that it may be detected
during periodic inspection. The fuse breaking time shall co-ordinate with the
pressure built up within the unit to avoid explosion. Mounting of the individual fuse
may be internal or external to the capacitor case.
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CHAPTER 4
LAYING OF CABLES
1.0 Scope :
This specification is intended to cover the requirements of installation and energising of
PVC/XLPE/PILCDSTA power cables including jointing of cables.
2.0 Standards :
The power cable and its fixing accessories shall comply with the latest relevant Indian
Standards and National Electrical Code.
3.0 Laying of Cables :
3.1 General :
3.1.1 Before the commencement of cable laying, it shall be ensured by the Engineer-inCharge that only ISI marked cables are used. It shall be the responsibility of the contractor
to check the soundness and correctness of the size of the cable while taking delivery of the
cable from stores. Any defect noticed shall be brought to the notice of the issuing
authorities immediately. If any defects is noticed after the cable is laid or during the process
of laying, it shall be brought to the notice of the Engineer-in-Charge and upon his
satisfaction, that the cable is not damaged due to bad handling, it will be the entire
responsibility of the contractor to retrieve the cable already laid and return the defective
cable to store and take fresh length of the cable from the store and relay the same.
3.1.2 The material such as bricks, sand, cable route markers, RCC slab of best quality as
approved by the Engineer-in-Charge only shall be used for cable laying works.
3.1.3 The contractor shall provide all the necessary labour, tools, plants and other requisites
at his own cost for carrying out pumping of water and removing of water from trenches, if
any, where required.
3.1.4 Installation shall be carried out in a neat, workman like manner by skilled,
experienced and competent workman in accordance with standard practices.
3.1.5 While laying the cable care shall be taken to avoid formation of kinks and also
damage to the cable. In the case of cable bends, it shall not have bent radius lesser than 20
times the overall diameter of the cable.
3.1.6 A cable loop of about five meters length and as directed by the Engineer-in-Charge
shall be provided at the following locations.
a) Near the termination points
b) Near to the straight through joint
3.1.7 The method of cable laying and routing of cables, shall in every case be as directed by
the Engineer-in-Charge / consultant.
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3.1.8 Whenever cable passes through hume pipes /GI pipes embedded across the wall in a
building, both the ends of the pipe shall be suitably sealed.
3.1.9 Identification tags indicating the size of the cable and feeder designation shall be
securely attached at both ends of the cable. Such tags shall also be attached to the cable at
intervals of 250 Mtrs. The materials of the tag shall be of either 12 SWG GI sheet or
plastic. In case of plastic, the details have to be engraved and incase of GI sheet, the details
should be punched. Cable route markers shall be provided at the intervals of 200 M with a
minimum of one number route marker. The details of the route makers shall be as per the
drawing. At the locations of straight through joints, necessary joint-markers shall be
provided.
3.1.10 When cable runs vertically, it shall be clamped on mild steel flats or angle iron
fixed on walls and are spaced at such intervals as to prevent buckling of the cables. All
steel work shall be painted with a coat of red oxide and thereafter finished with suitable
anticorrosive paints.
3.2 Cable laid in ground :
3.2.1. All MV cables (up to 1.1 KV) shall be laid at a minimum depth of 0.75 M & HT
cables (1.1 KV to 11 KV) shall be laid at a depth of 1.0 M when laid in ground. When
cable pass through roads, nallahs etc.they must be protected by either hume pipe or GI pipe
of suitable dimensions.
3.2.2. Excavations of trenches shall be carried out as indicated in the drawing. The width of
the trench at the bottom shall be 0.4 M for one cable. In case the total number of cables laid
in trenches is more than one, then the width shall be such that the spacing between the
cables is maintained as shown in the drawing. Before the cable is laid in the trench the
bottom of the trench shall be cleared from stones and other sharp materials and filled with
sand layers of 75 mm, as shown in the drawing.
3.2.3. While removing the cable from the drum, it shall be ensured that the cable drum is
supported on suitable jacks and the drum is rotated to unwind the cable from the drum. The
cable should never be pulled while unwinding from the drum. It shall be ensured that the
cables are run over the wooden rollers placed in the trench at intervals not exceeding 2 M.
3.2.4. After placing the cables in the trench shall be filled in layers ensuring that each layer
is well rammed by spraying water and consolidated. The extra earth shall be removed from
the place of trench and deposited at a place as directed by the Engineer-inCharge/consultant.
3.2.5. The LT Cables shall be provided with protection using class 1 bricks at sides and top
as indicated in Drawing and the HT cables shall be provided with RCC slabs (marked HT
cable) on top and class1 bricks on sides as protection.
3.3 Cables laid in built up trench :
3.3.1. Before the commencement of cable laying the cable trench shall be drained properly.
Cable shall be laid as explained in item 3.2. Cable shall be properly clamped to the cable
supports which are provided in the cable trench. The method of clamping shall suit the size
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of the cable and the cable supports which are provided in the cable trench. The method of
clamping shall suit the size of the cable and the cable supports, as directed by the Engineerin-Charge.
Care shall be taken while removing and replacing the trench cover slab. It is the
responsibility of the contractor to make good any damaged trench covers.
3.4. Cable terminations and straight through joints :
3.4.1. All cable jointing materials such as straight through joint boxes, cable compound,
cable lugs, insulation tapes etc. shall be of best quality and as approved by the Engineer-inCharge.
3.4.2. Cable glands for strip / armoured cables shall include a suitable armour clamp for
receiving and securely attaching the armouring of the cable in a manner such that no
movement of the armour occurs when the assembly is subjected to tension forces.
The cable gland shall not impose on the armouring, a bending radius not less than the
diameter of the cable. The clamping ring shall be solid and of adequate strength.
Provision shall be made for attachment of an external earthing bond between the metallic
covering of the cable and the metallic structure of the apparatus to which the cable box is
attached.
3.5 Sealing boxes :
3.5.1 A sealing box, irrespective of the class of insulation of the cable for which it is
intended, shall be so designed that it may be filled with compound after connecting the
cable specially in flame proof/hazardous areas.
3.5.2 All parts and connection for attaching the armouring, wiping or clamping the metallic
sheath in a sealing box, shall be easily accessible. This may be achieved by splitting the box
or by providing a suitable cover or other such means.
3.5.3 The joints in the box shall prevent leakage of the compound.
3.5.4 Provision shall be made to ensure that the cores of the cable are efficiently sealed to
prevent moisture penetrating along the strands or the cable conductors.
3.5.5 The sealing box shall be provided with compound filling orifices with suitable covers
or plugs of size that will permit easy pouring of the compound.
In all cases where screwed plugs are used, one or more air vents shall be provided to ensure
complete expulsion of air and total filling of the box with compound.
3.5.6 The box shall be of sufficient length to allow for manipulation of the insulated cover
without damage to them or to the insulation.
3.5.7 A sealing box intended to be attached directly to the apparatus shall be designed such
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that the box together with the connected cable may be detached from the apparatus without
disturbing the sealing compound.
3.5.8 Cable sealing and dividing boxes intended for use in the flame proof areas shall
comply additionally with the relevant requirements of IS: 2148-1968.
4.0 Testing
Once cable is laid, following tests shall be conducted in the presence of Engineer-inCharge, before energising the cable:
i) Insulation resistance test (Sectional and Overall).
ii) Sheathing continuity test.
iii) Continuity and conductor resistance test.
iv) Earth test.
v) High voltage test.
Tests conducted shall be as per Indian Standards and National Electrical Code.
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CHAPTER 5
EARTHING
1.0 SCOPE:
This specification is intended to cover the requirements of supply, installation, testing and
commissioning of
a) Pipe earthing
b) Plate earthing
c) Strip earthing
2.0 STANDARDS:
Earthing installations shall conform to the Indian Electricity Rules - 1956, as amended from
time to time and IS 3043-1989 "code of practice for earthing", with latest amendments.
3.1 Pipe electrode :
3.1.1 Electrode shall be made of CI pipe having a clean surface and not covered with paint,
enamel or poorly conducting material. Galvanized pipe shall not be smaller than 100 mm
ID. Earthing with pipe electrode shall be done as per the details indicated in IS : 3043/87 .
3.1.2 Electrodes shall be embedded below permanent moisture level.
3.1.3 The length of pipe electrodes shall not be less than 2.5 m. if rock is encountered,
pipes shall be driven to a depth of not less than 2.5 m with suitable inclination. Pipe shall
be in one piece and deeply driven.
3.1.4 To reduce the depth of burial of an electrode without increasing the resistance, a
number of rods or pipes may have to be connected together in parallel. The distance
between two electrodes in such a case shall not be less than twice the length of the
electrode. The earthing lead shall be connected by means of a through bolt, nuts and
washers and cable socket.
3.2 Plate electrode :
For plate electrodes, minimum dimensions of the electrode shall be as under.
3.2.1 GI plate electrode : 600 x 600 x 6 mm thick.
3.2.2 Copper plate electrode : 600 x 600 x 3.15 mm thick
3.2.3 The electrode shall be buried in ground, with its faces vertical and top not less than
2.5 M from the surface of the ground.
3.2.4 Earthing using plate electrode shall be done as per details, indicated in drawing.
3.2.5 Plate electrodes shall have a galvanized iron water pipe, buried vertically and adjacent
to the electrode. One end of pipe shall be at least 5 cm above the surface of the ground and
need not be more than 10 cm. The internal diameter of the pipe shall be at least 19 mm. The
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length of pipe under the earth's surface shall be such that it shall be able to reach the center
of the plate. The earthing lead shall be securely bolted the plate with two bolts, nuts, check
nuts and washers.
3.3. Strip or conductor electrodes :
3.3.1. Strip electrode shall not be smaller than 25 x 1.6 mm, if of copper and 25 x 3 mm, if
of galvanized iron and steel. If round conductors are used as earth electrodes, their cross
sectional area shall not be smaller than 3 sq.mm, if of copper and 6 sq.mm, if galvanized
iron and steel.
3.3.2. Conductor shall be buried in trenches not less than 0.5 m deep.
4.0 General :
i) All materials used for connecting the earth lead with electrode shall be of GI in case
of GI pipe and GI plate electrodes, and of tinned brass in case of copper plate electrode.
The earthing lead shall be securely connected at the other end to the main board.
ii) The earthing lead from electrode onwards shall be suitably protected against mechanical
injury by routing the earth wire / strip through a suitable size of GI pipe.
iii) All medium voltage equipments shall be earthed by two separate and distinct
connections with the earth. In the case of high and extra high voltages, the neutral points
shall be earthed by not less than two separate and distinct connections with the earth, each
having its own electrode at the generating station or substation.
iv) All materials, fittings etc. used in earthing shall conform to Indian standard
specifications wherever they exist. In the case of materials for which Indian standard
specifications do not exist, such materials shall be approved by the Engineer-in-Charge.
v) The earth electrode shall be kept free from paint, enamel and grease.
vi) It shall be ensured that similar materials for respective earth electrodes and earth
conductors are used.
vii)Earth electrode shall not be installed in proximity to a metal fence.
viii)Copper/GI strip shall be connected to the respective earth electrodes, either by
brazing or welding respectively. The Copper/GI strip shall be jointed only either by
brazing or by riveting at the end of over lapping portions. The over lap shall not be less
than 50 mm.
ix) Earthing clamps used for supporting earth strips shall be made of such materials so as to
avoid bimetallic action between strip and clamps.
5.0 Testing :
The earth resistance of each electrode shall be measured by using a reliable and calibrated
earth Meggar and the value shall be as per IS/IE rules.
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CHAPTER 6
ENERGY SAVER
1.
SCOPE
1.1
This specification covers the requirements of design, manufacture, testing, packing
and
supply of 250KVA Energy Saver for Lighting Equipment with automatic by pass
and Under Voltage bypass function.
1.2
Energy Saver receives Power from PMCC and supplies power to Main Lighting
panel. The Energy saver shall be designed with suitable transformer to maintain Constant
set Voltage output, even though Input voltage fluctuates
1.3
Energy saver of similar type and capacity shall have been supplied elsewhere
preferably for Oil Companies where Indoor and Outdoor Light fixtures are connected and
functional without any defects for the last 1 year. The Unit shall be tested for all functions
at the manufacturers premises before dispatch.
2.
CODES AND STANDARDS
2.1
All the major components used in Energy Saver shall conform to relevant
applicable BIS specifications
3. Constructional Features :
The broad specifications of the Energy saver shall be as follows
a) Capacity
: 250KVA, Both Input & Output shall be 415V
3Phase and Neutral
b) Shall Contain 3nos Specially designed Low loss Transformers
c) Protections
sides
d) Cable Entry
: Suitable rating MCCB on Input and Output
: Suitable Cable entry and termination provisions for
2Rx 3.5CX120sq.mm Cable on Input and output sides
e) Wiring inside Energy Saver
required
: Only Copper Wiring/ Copper Links of as
f) Selector Switches
: 3-Phase Output with suitable Tap Selector switches
: Mode selector switch for Normal-Off-Bypass modes
g) Metering
: 96X96mm analogue Ammeter with selector switch
: 96X96mm analogue Voltmeters – one for each phase
: LED type Phase indication lamps
: Energy Meter of Digital type
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h) Safety Features
: Cooling Fans to increase the heat dissipation
: 2nos Earthing Bolts
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CHAPTER 7
BATTERY CHARGER
1. Battery & Battery charger
1.1 Battery
Quantity
: 1No
Type of cell
: SMF Batteries
No. of battery cells
: 12
Rating
: 24V, 100 AH SMF/VRLA type
Duty
: Substation duty
Accessories
: The battery set shall be complete with stand
inter-cell connectors, floats, nuts & bolts, inter
row connectors, strain insulators and MS
mounting stand.
Reference standard
: IS-1651 & 1652
1.2 Battery Charger
The Float cum boost charger shall consists of one single phase double wound charger input
transformer, rectifier power bridge, Charger Control Card, LC Filter circuit, and
Auto/Manual Float/Manual Boost Charging mode selector switch.
The Charger shall be manufactured utilizing thyristors and diodes, which are connected in
full wave half controlled bridge configuration. The Charger output voltage regulation and
over load drooping characteristics shall be achieved by carefully determining the precise
moment to fire the thyristors by supplying proper gate pulses. Charger control card shall
accomplish this function.
The charger shall work with Single phase, 230V 50Hz AC input supply. The Charger
shall be capable of delivering the full rated current at the specified voltage at output
terminals. The voltage shall be maintained for an AC input voltage variation of + 10%
and load current variation from 10 to 100% of rated full load.
The Charger charges the battery in Auto or Manual Float or Manual Boost modes
depending on the mode selector switch position. In auto mode, the battery shall be charged
either in float or boost mode depending on the battery charging current. When charging
current exceeds a preset value Charger shall operate in float mode automatically.
All the circuits shall be housed in a single cabinet of folded sheet steel construction. All the
meters, indications, pushbuttons and control & switches shall be brought on to the front
panel.
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1.2.1 TECHNICAL SPECIFICATION OF CHARGER
Scheme
Type
Rating
:
:
:
Float Cum Boost Charger
Full Wave Half Controlled
24V/30A suitable for VRLA/SMF
battery
AC INPUT
Voltage
Frequency
Phase
:
:
:
230V AC + 10%
50Hz + 5%
Single Phase
DC OUTPUT
Float voltage
Boost voltage
Regulation
Ripple
Current
System output voltage
Efficiency
:
:
:
:
:
:
:
26.8V DC adjustable by +2%, -5%
27.6V DC adjustable by +/-5%
Better than + 0.5V DC of set value
Less than 3% RMS
30A (20A load + 10A Battery)
Max. 25.1V DC + 1% (at load terminals)
Better than 70% at full load
METERS
: Following analog type meters of size 96x96
Sq.mm with 900 deflections shall be provided in
the system.
DC Voltmeter with selector Switch(0-50V)
DC Ammeter.(0-50A)
INDICATIONS
:
Long life LED indicators shall be provided for
the following conditions with audio alarm for
abnormal conditions
AC supply ON (Neon lamp)
Charger ON
Charger fail
DC over voltage
DC under voltage
PROTECTIONS
:
Following protections shall be provided.
AC Input Circuit Breaker
Fast acting semiconductor fuse for Charger bridge
DC over voltage cutback.
DC over load
DC output Circuit Breaker
Battery input fuses.
CONTROLS & SWITCHES :
a. Float voltage adjust Potentiometer
b. Boost voltage adjust Potentiometer
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c.
d.
e.
f.
SPECIAL FEATURES
Auto/Float/Boost mode selector switch
DC voltmeter selector switch
AC Input Circuit Breaker
DC output Circuit Breaker
:
Soft start on DC side.
Class-F insulation for all magnetics.
Automatic voltage regulation using digital control
logic.
Filter circuit to limit ripple.
Charger current limiting.
Automatic Float/Boost changeover, based current
drawn by battery.
DCDB
a. Incomer
b. Outgoing feeders
GENERAL
a. Cabinet
:
:
:
Built in DCDB.
32A-2P-ON/OFF MCB-1No.
16A-2P-ON/OFF MCBs- 2Nos.
b. Temperature range
of operation
:
0Deg.C to 50Deg.C
c. Relative Humidity
:
0% to 95% non- condensing.
d. Paint
:
Light Grey - 631 of IS:5
e. Protection
:
IP - 42 as per IS 2147.
:Free standing, Floor mounting cabinet, sheet
steel construction, easy access for installation
and commissioning cable entry at bottom.
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3.0 RECOMMENDED MAKES OF MATERIALS
1A : DG SET
1. DG Set-Alternator
: Kirloskar/Stamford/Leroysomer/Mitsubishi
2. Diesel Engine
: Cummins/CaterPillar/Mitsubishi/
Kirloskar/Volvo/Perkins
3. Relays
: AVK SEGC/Woodwards
4. Batteries
: Exide/ Amaron/HBL-Nife
5. LT Switchgear
: Merlin Gerin /Schneider Compact/ L&T/Siemens/
Legrand/ C&S
6. Cables
: Nicco/ Gloster/ Universal/ Polycab
1B : TRANSFORMER
ESENNAR / PETE / KIRLOSKAR / VIJAI / RAYCHEM
1C : 11KV HT PANELS
1. Indicating Meters
: Enercon/L&T/AE/ Prok DVs.
2. Selector switches
: Vaishno/Salzer/Kaycee
3. Current Transformers
: Kappa/AE
4. Indication Lamps LED
(protected type)
: Schneider/ Vaishno/ Binay
5. Switchgear
:Megawin/Kirloskar/ A-Bond/
Schneider/Electroteknika
1D : EXTERNAL ELECTRICAL WORKS
1. FRLS Insulated Copper Conductor wires : Lapp /Finolex/ RR Kabel
2.MCBs/MCB Distribution boards
: Legrand/Hager/Merlin Gerin
3.MCCBs
: Merlin Gerin(Compact)/L&T/ Siemens/Legrand
4.Under ground Cables
: Unistar/ Nicco/ Gloster/ Polycab
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5. Cable Glands
: HMI/Comet/Braco
6.Cable Lugs
: Dowell's/3D
7.MV Panels (PCCs)
: Manufacturers with CPRI Test Certificate.
(Renewed not earlier than 3-years)
8. Earth Leakage relay
: Prok Dvs/Nagoba
9. Indicating Meters
: Conzerv/L&T/AE/ Prok DVs
10. Selector switches
: Vaishno/Salzer/Kaycee
11. Current Transformers
: Kappa/Poweronics/ Instelec
12. Indication Lamps LED (protected type) : Schneider/ Vaishno/ Binay
13. TVSS
: Obho Betterman / ABB / Schneider/ Busman
14. Capacitors
: : Epcos / Neptune /Meher
15. APFC Relay
: Beluk/ Neptune/ Epcos
16. Battery Charger
: Exide/ Amara raja /HBL make.
17. Energy Saver Transformer
: Shephered / Beblec / Servomax / Esennar
Note : Before use of any of the above brands for the Project, Prior Written permission
shall be taken from client/ Consultant. The Client /Consultant shall have choice to
select any of the above approved brands.
4.0 TENDER SCHEDULE (BILL OF QUANTITIES)
(Enclosed separately as Price Bid)
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5.0 SPECIAL CONDITIONS
1. General : The General Conditions shall be as applicable for the works given.
1.1 These special conditions shall be read in conjunction with the description of the item of
work in the Bill(s) of Quantities, the particular Specifications, Local Statutory Regulations,
Indian Standards Specifications/ Codes and the drawings. All the above quoted documents
shall be considered supplementary to each other. However, in the case of conflict amongst
the various provisions the owner's and the consultant‟s opinion will be final and shall be
adopted.
1.2 The tenderer is advised to inspect the site to ascertain the nature of site, access thereto,
local facilities for procurement of materials and working labour rates prevalent in the area,
in fact all matters affecting his prices and execution of the work. The tenderer shall be
deemed to have full knowledge of the site and drawings whether or not he actually inspects
them.
2.0 Rates
2.1 The rates quoted shall be deemed to allow for all minor extras and constructional
details which are not specifically shown on drawings or given on the specifications but are
essential in the opinion of the Engineer-in-charge to the execution of works to confirm to
good workmanship and sound engineering practice. The Consultant/Employer reserves the
right to make any minor changes during the execution without any extra payment.
2.2 The Consultants decision to clarify any item under minor changes, minor extras and
constructional details shall be final, conclusive and binding on the Contractor.
2.3 The rates quoted by the Contractor shall be net so as to include all requirements
described in the contract agreement and no claim whatsoever due to fluctuations in the
price of material and labour will be entertained.
2.4 The rates quoted by the Contractor shall include for supplying materials and labour
necessary for completing the work in the best and most workmanship like manner to the
satisfaction of the Consultant/Employer and which in the opinion of the Consultant cannot
be made better, and for maintaining the same. The rates shall be complete in all respects
also including cost of materials, erection, fabrication, labour, supervision, tools and plant,
transport, sales and other taxes royalties, duties and materials, contingencies, breakage,
wastage, sundries, scaffoldings, etc., on the basis of works contract. The rates quoted shall
include all taxes, duties, transport, insurances, octroi, or any other levies applicable under
the statute.
3.0 Materials :
3.1 The Contractor shall ensure to the satisfaction of the Consultant/ Employer that the
materials are packed in original sealed containers/ packing bearing manufacturer's markings
and brands etc., except where the gross quantity required is a fraction of the smallest
packings. Materials not complying with this requirement shall be rejected.
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3.2 Testing of Materials :
a) When required by the Consultant, the Contractor shall provide all facilities at site or at
manufacturer's works or in an approved laboratory for testing the materials and /or
workmanship. All the expenditure in respect of this shall be borne by the Contractor unless
specified otherwise in the Contract. The Contractor shall, when required to do so by the
Consultant shall submit at his own cost, manufacturer's certificate of tests, proof sheets,
mill sheets etc., showing that the materials have been tested in accordance with
requirements of these specifications.
b) Neither the omission by the Consultant to test the materials nor the production of
manufacturer(s) certificate etc., as aforesaid shall affect the right of the Consultant to reject,
after delivery the materials found unsuitable or not in accordance with the specifications.
4 Drawings :
4.1 Clarifications required or discrepancies, if any, noted by the Contractor in the various
drawings supplied by the Consultant must be obtained well before execution, failing which
the decision of the Consultant shall be final and binding on the Contractor with regard to
detailing and general acceptance of the Contract.
5.0 Rectification of Defects :
5.1 Any defect in the work done or materials used in the works pointed out by the
Consultant shall be rectified within a week or such extended time as may be allowed in
this failing which the said defect shall be got rectified by the Consultant at the risk and
cost of the Contractors.
6.0 Cables Layout :
6.1 Prior to the laying of the cables, the Contractor shall submit to the Consultant detailed
layout plans of the cable network and get the same approved. The layout plans shall contain
particulars regarding size and routes of the cables etc. The Cables shall be procured only
after approval of Layout Drawings.
7.0 Regulations & Standards :
7.1 The installation shall conform in all respects to Indian Standard Code of Practice. It
shall also be in conformity with the current Indian Electricity Rules and Regulations and
requirements of the local Electric supply Authority in so far as these become applicable to
the installation. Wherever this specification calls for higher standard of material and/or
workmanship than those required by any of the above regulations then this specification
shall take precedence over the said regulations and standards.
8.0 Shop Drawings :
8.1 The vendor shall prepare and submit to the Consultant for the approval of detailed
drawings for the equipment within 10 days of signing of the contract.
9.0 Completion Drawings :
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9.1 At the completion of the work and before issuance of certificate of virtual completion
the contractor shall submit to the consultant/Employer layout drawings drawn at approved
scale indicating the complete system executed "As Installed". These drawings shall in
particular, give the following information.
(a) Location and details of Main panels, switchgear and other particulars.
(b) A complete diagram, as installed and schematic drawings showing all connections in
the complete electrical system.
(c) Locations of all earthing stations, routes and size of all earthing conductors, manholes
etc.
(d) Layout and particulars of all cables.
Three (3) Sets of hard copy Prints and One (1) set of Soft copy of As-Built Drawings shall
be submitted after completion of work.
10.0 Manufacturer's Instructions:
10.1 Where manufacturers have furnished specific instructions, relating to the materials
used in this job, covering points not specifically mentioned in the documents, these
instructions shall be followed in all cases.
11.0 Completion Certificate :
11.1 On completion of the Electrical Installation a certificate shall be furnished by the
Contractor counter signed by a licensed supervisor, under whose direct supervision the
installation was carried out.
This certificate shall be in the prescribed form as required by the local supply authority.
The Contractor shall be responsible for getting the drawings and Electrical Installation
inspected and approved by the local Authority concerned. Only Statutory Fees, if any
applicable, only will be paid and Incidental expenses will not be paid.
12.0 Qualified Competent Supervision :
12.1 The Contractor shall employ competent fully licensed, qualified full time Engineer to
direct the work of Electrical installation in accordance with drawings and specifications.
The Engineer shall be available at all times on the site to receive instructions from
Consultant in the day to day activities, through out the duration of the contract. The
foremen shall co-relate the progress of the work in conjunction with all relevant
requirements of the supply authorities.
13. Approval from relevant authorities/boards etc :
To be obtained by the suppliers (if applicable) and no fees will be paid towards the same.
14. Warranty & Guarantee:
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Performance Guarantee
The equipment supplied or the entire work executed under this contract
shall be guaranteed against manufacturing defects and/or bad
workmanship for a period of One (1) year (minimum) from the date of
completion (after the date of contractual completion). Any defect arising
out of reasons attributable to manufacturing defect and/or bad
workmanship, in the assessment of Developers, shall be rectified/replaced
to the satisfaction of the Developers free of cost to the Developers during
this Performance Guarantee period. An amount of 10% of the contract
value, in the form of bank guarantee, shall be retained by the Developers
as Security Deposit for implementing the Performance Guarantee if and
when required
15. Abstract Terms and Conditions:
1.
Defects Liability Period.
12 calendar months from completion date or
handing over (as applicable)
2
Period for final measurement
and valuation.
2 weeks.
3.
Date of commencement.
Within 7 days after confirmation.
4.
Date of completion.
3 months from date of commencement.
5
Agreed liquidated damages.
0.5% of the total contract amount per week
beyond the date of completion subject to
maximum of 5%.
6
Initial Security Deposit./ Earnest
Money Deposit
3% of the total estimated value of the quote
7
Retention Money.
8% of interim certificate amount of running
account bill –where as 5% on the final
Certificate
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8
Installment after virtual
completion.
50% of the total retention money – after the
contractor removes all the left over
materials, machinery etc.,from site
9
Period of honouring certificate.
15 days.
10
Income Tax Deduction and S. T.
under works contract act.
As per Central / State Government rules.
11
Insurance, Custom duties and
taxes.
To be provided and paid by contractor.
12
Price Escalation.
Will not be considered.
13
Rate of BOQ’s items.
To include item complete in all respects.
NOTE: IT IS TO BE NOTED THAT ALL THE TERMS & CONDITIONS MENTIONED BY
THE CLIENTS IN THE TENDER NOTICE / INFORMATION AND GUIDE LINES
FOR BIDDERS/ QUESTIONAIRE / CHECK LIST SHALL BE FINAL.
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