TECHNICAL SPECIFICATION OF
D.C. DISTRIBUTION BOARD.
1.
1.02
SCOPE:
This specification provides for design, Engineering, manufacture, stage testing, inspection and
testing before dispatch, packing, forwarding and delivery at site of D.C. Distribution Board,
complete with all fittings accessories and associated auxiliary equipment mandatory which
are required for efficient and trouble free operation as per specified here under.
It is not the intent to specify completely all the details of design and construction of equipment.
However, the equipment shall conform in all respects to the high standard of engineering,
design and workmanship and shall be capable of performing in continuous commercial
operation up to the Bidder’s guarantee acceptable to the purchaser. The equipment offered
shall be complete in all component necessary for its effective and trouble free operation along
with associated equipment interlocks protection scheme etc. Such components shall be
deemed to be within the scope of supply irrespective of whether those are specially brought
out in this Specification and or the commercial order or not. All similar parts particularly
movable ones shall be interchangeable.
CLIMATIC CONDITIONS :
As per Section-I Vol-II.
1.03
STANDARD:
All material and equipment shall comply in every respect with the requirements of the latest
edition of the relevant Indian Standard IS:1651.
1.04
MANUFACTURE AND WORKMANSHIP:
All the material used in the construction of the equipment shall be of the best quality
obtainable of their respective kinds and whole of the work shall be of the highest class, well
finished and of approved design and make. Casting shall be free from blow holes, flaws and of
the true form and dimensions.
1.05
1.06
All machined surfaces shall be true and smooth and well finished.
DUTY AND GENERAL ARRANGEMENTS:
The power for the charging apparatus shall be given through an independent 4-core cable
connection from an A.C. 50 cycles 3 phase 415 ± 10% volts switchboard fed from a Station
Transformer. D.C. Distribution shall be through fuse protected rotary switches mounted on a
separate distribution board.
TYPE OF EQUIPMENT:
All equipment shall be located indoors. D.C. Distribution panel are to be mounted on the floor
in the control room adjacent to the Battery room.
Necessary doors and screens shall be provided wherever required. All equipment shall be
vermin proof. The overall design of the entire equipment should be adequate for the duty in
view to ensure trouble free and dependable service.
The various cables for D.C. Distribution circuits, which are to be arranged by the Bidder shall
have P.V.C. insulation. The conductors may be of copper or aluminum. All panel wiring to be
provided by the supplier, shall consist of suitable colored/marked P.V.C. insulated cables.
1.07
BUS BARS AND SUPPORTS:
The bus bars shall be of aluminium having adequate cross-sections. The bus bars shall be so
designed and mounted that their expansion and contraction does not subject, either the Bus
Bars or their supports, to any stresses. All bus bars and connections shall be duly marked and
colored for identification.
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1.08
1.09
1.10
1.11
1.12
INSTRUMENTS:
All instruments shall have 96 sq mm dials and flush mounted on the panels. Moving coil spring
controlled instruments shall be used except those for A.C. which may be of the moving iron
type. The error of indication shall not exceed 1% throughout the effective range of the meter.
RESPONSIBILITY FOR DESIGNS:
The Bidder shall assume full responsibility for co-ordinate and adequate design and shall
conform to the best engineering practice for the operating conditions specified. In case the
equipment covered by this specification is to be co-ordinate with other equipment, the Bidder
shall furnish complete information and data as may be desired by the purchaser.
GROUNDING:
All metal parts should be grounded according to Indian Electricity Rules. Main ground Bus
shall be provided by the purchaser. Special grounding lugs of adequate size shall be provided
by the supplier on the charging equipment.
INTER CHANGEABILITY:
Corresponding parts of plant and equipment shall be made to gauge or jig and shall be
interchangeable in every respect.
DOCUMENTATION
The successful bidder shall submit four sets of drawings for HVPNL approval.
The following drawing shall be supplied with the tender: i)
Outline drawings of all apparatus showing sufficient details to enable the purchaser to
determine whether the design proposed can be installed satisfactorily or not.
NOTE: All above drawings should be a minimum space (14x10cm) for stamping the
approval of drawings by HVPNL.
1.13
FOUNDATIONS AND FIXINGS:
All plants and equipment shall be provided with a complete set of foundation holding down
bolts, washers, nuts plants and other fixture as may be required and these shall be supplied
by the Bidder. These fittings will be fixed by the purchaser in the foundations unless otherwise
specified. All foundation bolts, fixtures etc. shall be supplied as soon as possible after the
contract drawings have been approved.
1.14
INSTRUCTION AND MARKING PLATES:
All gauges, meters, instruments etc. shall have dials or scales calibrated in metric system of
units. All name plates, instruction plate, warning signs and any marking what-so-ever on the
equipment and its parts and accessories shall be in Hindi-English Language, using idioms,
words and meaning as in current use in India.
In order to facilitate sorting and erection at site every part of the plant and equipment shall be
suitably marked.
1.15
TROPICAL TREATMENT & PAINT:
All corrodible parts and surfaces shall be of such material and shall be provided with such
paint or other protective finish that no part of the installed equipment shall be injuriously
affected by the atmospheric moisture, heat and fumes. The panels shall be finally painted with
light grey paint having shade No.631 of IS:5 with stove enameled finish.
1.16
PLACE OF MANUFACTURE AND INSPECTION:
The Bidder shall state in his tender the place(s) of manufacture, testing and inspection of the
various portions of the work included in the tender. The purchaser or his duly authorised
agent shall have access to the Bidder's or sub Bidder's work at any time during working hours
for the purpose of inspecting the manufacture and testing of materials, equipment and
completed plant and the Bidder shall provide the necessary facilities for inspection.
TESTS:
Type Tests
The equipment should be offered type test. Test reports should not more then seven years old
reckoned from date of bid opening in respect of all the tests carried out in accredited
1.17
1.17.1
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1.17.2
1.17.3
laboratories (based on ISO/IEC) by a reputed accreditatic body or witnessed by HVPN or
another electric power utility and be submitted by the successful bidder to HVPNL for approval
as schedule given in Bar Chart.
i) Verification of constructional requirements
ii) Verification of marking
iii) Verification of dimensions
Routine Tests
As per quality assurance program (QAP).
Acceptance Tests
The following acceptance tests for DCDB shall be carried out by the Supplier in presence of
HVPNL representative, unless dispensed with in writing by the HVPNL.
i) Dimension test
ii) Visual check test
iii) quantative check
iv) Functional checks
v) wiring HV Test
vi) Insulation resistance test
1.17.4
SAMPLING SCHEME AND CRITERIA FOR ACCEPTANCE:
The sampling scheme and criteria for acceptance for cells up to and including 600 AH
capacity shall be in accordance with clause 5 1.4 of IS-8320-1976. The sampling scheme for
cells of higher capacities shall be subject to agreement between the user and the
manufacturer.
1.18 SPARE PARTS :The Bidder shall quote separately in his tender for spare parts as he world recommend for the
main maintenance operation of the equipment for the period of 5 years. Of detailed list of such
spares parts which item wise prices shall be given under schedule of requirement and prices.
The purchaser may order spares subsequently as may be finally decided upon, at the rates
given in the tender. All spares parts shall be interchangeable and shall be of same make
material and both workmanship as the corresponding parts furnished with the main
equipment.
1.19 DETAILS OF TECHNICAL PARTICULARS AND SPECIFICATION:
Details of the technical particulars and specification required have been given in
Appendix (b). Any other particulars considered necessary by the supplier may also be given
in addition to the above listed in Data requirement sheet.
1.20
COMPLETENESS OF EQUIPMENT:
Any fittings, accessories or apparatus which may not have been specifically mentioned in the
specification, but which are usually necessary in the equipment shall be deemed to be
included in the contract and shall be supplied by the Bidder without extra cost.
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APPENDIX 'A'
SCHEDULE OF REQUIREMENT
D.C. DISTRIBUTION BOARD:
The D.C. Distribution Board shall be housed in a sheet steel cubicle with adequate ventilation and
it should be vermin proof as far as possible and should be provided with louvers for ventilation
backed by fine wire mesh, which applies to both charging equipment and D.C. Distribution Board.
The DCDB shall match with the battery charging equipment and should be complete with bus bars
of suitable capacity, wiring, rating plates, glands and fixing bolts. The minimum size of cubical
should be 600X700X1600 mm. The following components shall be provided on the D.C.
distribution board:
FOR 200 AH & 100 AH BATTERIES
1.
Double pole ON/OFF rotary switch of 200 Amps. for 200 AH rating Battery with
1 set
2 Nos. HRC fuses of 100 Amps
2.
Moving coil ammeter of 96mm sq. and range 0-200 amps. for 200 AH battery
1 No
for measuring the load on the bus.
3.
Change over contactor :
a) 20 Amps. for 200 AH battery change over contractor AC/DC for switching
1 No
indication over to DC. On failure of AC supply and also for emergency pilot
light in the event of AC failure.
b) 10 Amps HRC fuses for pilot light
4.
2 Nos.
Double pole D.C. Rotary switches with HRC fuses for each of following
feeders:
a) 220 kV closing supply of 50 Amps, capacity
1 No.
b) 132 kV closing supply 50 Amp. Capacity
1 No.
c) 66 kV
-do-
1 No.
d) 33 kV
-do-
1 No.
e) 11 kV closing supply 100 Amps. capacity
1 No.
f & g) spare 100 Amp. Capacity
2 Nos.
h & i) spare 50 Amp. capacity
2 Nos.
5.
Double pole D.C. rotary switch of 10 Amps. rating with 10 Amp. HRC fuses for
each of the following feeders:
a) 11 kV Tripping supply 10 Amp capacity
1 No.
b) 33 kV
-do-
1 No.
c) 66 kV
-do-
1 No.
d) 132 kV
-do-
1 No.
e) 220 kV
-do-
1 No.
f) Carrier telephone 10 Amp. capacity
1 No.
g) 33 kV Relay & Board panel 10 Amp. capacity
1 No.
h) 66 kV Relay & Board panel 10 Amp. capacity
1 No.
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i) 132 kV Relay & Board panel 10 Amp capacity
1 No.
j) 220 kV Relay & Board panel 10 amp. capacity
1 No.
k) Spare 10 Amp capacity
3 Nos.
All the instruments shall be of flush mounted type. The rotary switches shall
also be flush mounted except for the protection portion in the panels. All
switches shall be mounted on the front panel and all the HRC fuses together
with their fuse fittings on the front panel but within a chamber that can be
opened by half doors, to occasion accessibility to the fuses. The various
components shall be of the best quality and from reputed manufacturers. The
layout of components, wiring workmanship reliability etc. shall be of the best
quality. Adequate room should be provided within the charger/DC distribution
board cubicles for easy accessibility of components and also to facilitate
ventilation.
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