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ANNEXURE – 1 (for Sl.No.05)

DETAILED TECHNICAL SPECIFICATION OF 1250kVA OUTDOOR TRANSFORMER

SCOPE

Supply, installation, testing and commissioning of 1250 KVA, 11kV / 433V,

3 Phase, 50Hz, Outdoor type, copper wound, plinth mounted, Delta / Star connected

Dyn11, oil filled, ONAN type of cooling, core type distribution transformer with no load

voltage ratio of 11000 V / 433 V, having off load tap changers. The tapping of

transformers shall be of +5% to -10% in steps of 2.5% and suitable for operation in an

ambient temperature up to 50°C.

The transformer shall conform to the IS: 1180, part I : 2014 with latest

amendments in all respects like insulation levels, temperature rise, impedance voltage

and losses in general shall meet as specified in various annexures attached herewith.

Temperature rise shall not exceed 45°C over ambient in the winding and 40° C in

oil as per IS: 335. The transformer shall be designed for continuous operation and to

operate satisfactorily in parallel with similar units.

The core of the transformer shall be built up with high-grade cold rolled, non-

ageing, low loss and high permeability grain oriented silicon steel laminations. The core

shall be rigidly clamped and fastened to ensure adequate mechanical strength. Suitable

lugs for lifting the complete assembly shall be provided on the transformer. Suitable

provision shall also be there for lifting the core out of the tank.

The copper conductors used for the winding of the transformers shall be of best

quality and all the leads and joints shall be welded or brazed. Windings shall be

securely clamped to avoid any displacement or deformation during short circuits. The

assembled core and winding shall be vacuum dried and suitably impregnated before

removal from the treating tank, so as to have specified class of insulation. Liberal

clearances i.e, more than the statutory clearances shall be provided around the core

such that any overhang of the winding / joints can never come in direct contact with the

body / tank of the transformer.

Insulating oil for first filling shall be supplied with the transformers. Adequate

extra oil required for top-up during commissioning shall also be arranged by the

supplier. The oil shall generally conform to IS: 335 – 1993 with latest amendments.

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The minimum no. of accessories as mentioned in the enclosed annexure shall be

provided in the transformer. Apart from these any other fittings, accessories or

apparatus, which are standard and necessary for the transformer for its satisfactory

operation or required to be provided as per BIS, are all to be provided.

The oil conservator shall be provided with two filter valves (one at the bottom and

other at the top) on the transformer. Oil level gauge shall be mounted on the

conservator tank. The silica gel breather shall be so positioned that it can be seen

clearly by an operator standing on the ground.

The transformer shall be provided with a marshalling box, in which all leads for oil

and winding temperature indicators and alarms including `low oil level’ alarm shall be

brought out to suitable terminals and labelled clearly. The control wiring drawing of the

Marshalling box shall be neatly printed, laminated and affixed over the inner side of the

Marshalling box cover for any time reference. Control cable knockouts of suitable sizes

shall be provided in the Marshalling box. The scope of work includes supply and laying

of control cables between transformer and existing VCB.

The exterior surfaces of transformer including radiator cooling fins and HV/ LV

terminal boxes shall be surface treated by seven tank process followed with epoxy

powder coated of Department approved shade.

The HT cable end box on the primary side of the transformer shall be suitable for

providing heat shrinkable end termination of 1R x 3C x 95 Sq.mm, 11 kV(E) XLPE cable

and provision shall be made to connect 2000A Aluminium LT bus duct (3000 Sq.mm) on

the secondary side of the transformer.

The transformers shall be completely assembled and tests at the factory in

accordance with relevant IS shall be conducted on each of the transformer.

The transformer shall conform to the various requirements as furnished in the list

of Annexures. Transformers shall meet the requirements as mentioned in the

“Guaranteed technical particulars”.

NOTE:

1. Construction of transformer tank shall be provided as follows:

(i) Thickness of side plates shall be 5 mm minimum

(ii) Thickness of bottom plates shall be 6 mm minimum

(iii) Thickness of cover plates shall be 6 mm minimum

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(iv) Thickness of gland plates shall be 3 mm minimum.

2. A separate shut off valves on both sides of buchholz relay shall be provided.

3. Explosion vent shall be provided with oil sight glass and double diaphragm.

4. The oil conservator shall be provided with two filter valves (one at the bottom and

other at the top) on the transformer. It shall be provided with lifting lugs.

5. Radiators shall be provided with air release plug, lifting lugs and drain plug.

6. Earthing terminals of transformer body shall be suitable for connecting 50 x 6 mm GI

strips.

7. Off-load tap changer shall be provided with mechanical position indicator and locking

device.

8. The cross sectional area of Al bus bars for LV terminal shall be not less than 3000

Sq.mm.

9. Copper flexible strips shall be provided at all gasketed joints for earth continuity

purpose.

10. In existing VCB panel, one 8 window annunciation is provided already. But, the

cablings with proper size and required no of cores shall be provided to have alarm

and trip indications for buchholz relay, MOG (only trip), winding temperature and oil

temperature in place of indication lamps in the front door of existing metering cubicle.

Control wiring shall be carried out to trip the existing VCB panel in the event of

operation of above said conditions. In existing VCB panel, necessary control cabling

and modification as per requirements shall be carried out.

11. Neutral CT of ratio 500/5A, 15VA 5P10 Cast resin type with control wiring to trip HT

VCB panel on operation of REF relay. Neutral CTs shall be provided on the

transformer neutral earth and REF CTs shall be provided at the exit of bus duct with

tripping arrangement at existing HT VCB. Supply of CTs for REF operation at existing

VCB panel is in the scope of successful tenderer.

LIST OF MINIMUM FITTINGS AND ACCESSORIES:

1. Lifting Lugs: Necessary lifting lugs shall be provided to lift the transformer without

disturbing the connection. - 2 Nos.

2. Flat Rollers: Bi-directional rollers shall be fitted on the cross channel at the

bottom of the transformer so as to facilitate the movement of transformer in

forward and reverse directions. - 4 Nos.

3. Oil Conservator: Suitable size of oil conservator with drain plug, oil level

gauge with marking for minimum level and oil filling hole with plug - 1 No.

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4. Oil-level indicator and magnetic gauge having marking for the minimum level

and float/sensor for minimum oil level sensing i.e. provided with LOLA

contacts - 1 No.

5. Air release device on the top of the tank cover to facilitate the release of the

entrapped air while filling of oil. - 1 No.

6. Breather: Sufficient capacity of indicating de-hydrating silica gel breather. -

1 No

7. Drain cum oil filter valve: Drain cum oil filter valve with plug to be provided at

the bottom of the transformer. – 1 No.

8. Radiator cutoff valves for all radiator - 2 nos. each.

9. Earthing terminals: Separate earthing terminals shall be provided on both

sides of the tank for earthing. - 2 nos.

10. Buchholtz relay

11. Winding temperature indicator

12. Diagram and rating plate: The transformer shall be fitted with diagram and

rating plate indicating the details of transformer as per IS, connection

diagram, vector group etc. One set

13. Terminal marking plates on HV and LV side - One set

14. Stem type dial thermometer of range 0 – 150 deg.c - 1 No.

15. Thermometer Pocket - 1 No.

16. Explosion Vent: The transformer shall be fitted with an explosion vent of

suitable size with diaphragm. - 1 No.

17. Top Filter Valve with plug. - 1 Set.

18. Marshalling box along with following instruments with wiring.

01. Top oil temperature indicator (0- 150 Deg C) with

alarm and trip contact terminals - 1 No.

02. Winding temperature indicator (0- 150 Deg C) with

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alarm & trip contact terminals - 1 No.

03. Low oil level alarm contact terminals - 1 Set.

04. Terminal block wired with above provisions and with 20%

spare terminals - 1 Set.

06. Sight glass, door and locking arrangements - 1 Set.

07. Control wiring drawing laminated and affixed - 1 Set.

19. Jacking lugs - 4 Nos.

20. Cover lifting lugs - 3 Nos.

21. Inspection cover - 1 No.

22. HV cable box - 1 No.

23. LV terminal box suitable for sandwich Bus duct. - 1 No.

24. Separate Neutral terminal on LV side - 1 No.

Note:

1. Apart from the above, any other fittings, accessories or apparatus, which are

standard and considered necessary for the transformer for its satisfactory operation or

required as per BIS, are all to be provided by successful tenderer.

2. The transformer shall be provided with first filling of oil. The transformer oil shall

conform to IS 335/1993 with latest amendments.

LIST OF TEST TO BE CONDUCTED AT FACTORY/WORKS OF MANUFACTURER

The following tests shall be conducted as per IS at the factory / works in the presence

of Department Engineers before dispatching and all the tests certificates shall be

furnished for acceptance.

1. Measurement of winding resistance

2. Measurement of Voltage Ratio and check of voltage vector relationship

3. Measurement of Impedance voltage / short circuit impedance

4. Measurement of Load losses

5. Measurement of No load losses and no load current

6. Measurement of Insulation resistance

7. Measurement of Induced over voltage withstand test

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8. Measurement of Separate source voltage withstand test

9. Vector group test

10. Magnetic balance test

11. Pressure test

12. Temperature Rise test

ERECTION AND COMMISSIONING

Immediately on arrival, the transformer shall be carefully examined for any

damage, during transit, paying particular attention to bushing and cooling tubes etc.

The presence of rust, condensation anywhere within the tank, the pink colour of silica

gel breather provided with transformer filled with dry air or considerable drop in the

pressure of nitrogen or other inert gas filled in transformer suggests absorption of

moisture by the transformer windings. In such cases, the transformer shall be dried out

before being commissioned. The transformer shall be filled with oil as soon as possible

after satisfactory inspection and set up in their permanent locations even though not

expected to be energized for some time. Before moving the transformer, the bi-

directional rollers shall be fixed in the required direction. The transformer may then be

moved to its permanent position. Care shall be taken when using any levers etc; that

they do not touch the tank or cooling tubes and only the skids or rollers shall be used for

this purpose. Transformers shall be lifted by lugs provided for the purpose and

simultaneously use shall be made of all lugs to avoid any imbalance and it shall be

ensured that all cover bolts are tightened. Where it is necessary to use jacks for lifting,

the projections / lugs provided for the purpose of jacking shall be used. Jacks shall never

be placed under valve or cooling tubes. In certain circumstances, jacks may be placed

under stiffening curbs on the tank base. Care shall be taken that spanners or other tools

used in connection with work are not dropped into or left inside the tank. The transformer

shall be placed on suitable roles or tracks on level concrete plinth with bearing plates of

sufficient size and strength where the transformer is in the final position; the wheels

shall be locked to prevent accidental movement of the transformer.

After positioning of transformer all electrical power and control connections shall

be done in approved manner.

The transformer should be installed on the pedestal (construction of concrete

pedestal is in the scope of department). Contractor should provide all the hardware

including ISMC 100 channel that is necessary for erection. The drawings, layout, etc;

should be got approved by Department. The power transformer shall be installed, tested

and commissioned.

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After the transformer has been installed at the place of operation and before

connecting it to supply, the transformer tank shall be earthed. All connections of the

earthing system shall be visible for periodical inspection. Copper strip as specified shall

be used for earthing to the earth grid. The transformer neutral point shall be brought out

and solidly earthed by copper strip of suitable size.

Following tests at site shall be conducted on the transformer prior to its

commissioning.

a. Insulation resistance of the winding between phases and between individual

phases and earth on both HV and LV sides and also between HV and LV

windings.

b. Winding resistance

c. Dielectric strength of transformer oil.

d. Voltage ratio test at all tap positions.

e. Polarity test.

f. Magnetic balance & Vector Group test

g. Proper functioning of all protective relays.

After commissioning of the transformer the LV side voltage shall be measured at

different tap positions. The transformer shall be kept on no load for 24 hours, and shall

be ascertained that there is no undue temperature rise before loading the transformer

OTHER IMPORTANT TERMS AND CONDITIONS

1. Test certificates for the batch of core material procured from principals to be utilized

for these transformers shall be furnished for the perusal of Dept.

2. All test facilities required shall be provided for the tests prescribed in the schedule by

the party without any additional cost at their factory as well as at site for testing and

commissioning of transformers. The tests shall be carried out in the presence of our

inspection team before dispatch from their works and during commissioning of the

same.

3. The supplier shall submit the following drawings for approval before

manufacturing/execution

1. General arrangement drawings

2. Foundation drawings

3. Terminal boxes of HT / LT side with details of HT and LT

bushings/ insulators

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4. Marshalling box drawings

5. Name plate details etc.

5. The safe unloading of the transformers at site and positioning them in identified

location with necessary plants / equipment and tools shall be the responsibility of

supplier and all required man power shall also be provided by the agency for unloading /

shifting of the transformers to the plinth of the transformers room and installing in

position as required. However heavy moving equipment such as fork lift / crane required

will be arranged by Department on chargeable basis subject to then availability.

6. The supplier shall be responsible for all the safe custody of the transformers and its

accessories from the time of supply of transformers at site till installation, testing and

commissioning and handing over the same to the department on satisfactory completion

of work.

7. The contractor shall repair / replace the damaged equipment without any extra cost

during the guarantee period of 12 months.

8. Details required for installation viz., providing MS channels and locking the

transformers shall be furnished. Proper installation and positioning of transformers over

the plinth/floor and providing locking arrangements for the wheels shall be the scope of

the tenderer.

9. The works of installation, Testing and commissioning of transformers shall be done

by employing qualified competent engineers / supervisors and all instructions of the

department shall be strictly followed for the completion of work with good workmanship

as required and as per the IE rules and regulations and other mandatory requirements.

10. The transformer oil shall be got tested as per IS – 335 from authorized agencies

before commissioning of the transformers and the required di-electric strength of the oil

shall be met with and certificate to this effect shall be provided to the department.

11. Any mandatory requirement specified by the inspection authority (CEA) for

energisation of transformer along with VCB shall be carried out without any additional

cost or as mutually agreed upon which is also a part of work.

12. The supplier shall provide all the technical literatures related to the transformers and

Instructions to be followed for installation along with supply. Also three complete sets of

operation and maintenance manuals are to be furnished to the department for the

operation and maintenance purpose of the department.

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Annexure – 2 (For Sl.No:06)

SPECIFICATION FOR FACILITY MV PANEL:

Supply of Medium voltage panel suitable for operation on 415 volts, 3 phase 4 wire 50HZ, AC supply system, to withstand a short circuit level of 50 kA RMS symmetrical and suitable for AC 23 duty. The Main MV panel shall

be fabricated with 14 gauge CRCA sheets for free standing, floor mounting, front hinged for indoor use, cubicle type, side/ back covers removable, a

removable bottom gland plates for incoming and outgoing connections, dust and vermin proof, with TPN aluminum bus bars, complete with internal

wiring, ferrules, name plates, painting etc., and having the specification / technical particulars given below.

MEDIUM VOLTAGE PANEL CONSISTING OF:

1) BUSBAR: 1600 Amps TPN aluminum bus bar of capacity 2400 Sq.mm Bus bar for phase & 1200 Sq.mm Bus bar for Neutral (suitable for 50 KA fault level) and with copper earth bar 25x3mm (tinned) - 1 Set

2) INCOMING WITH METERING CUBICLE: 1600A, TP, 50 kA ACB (EDO

Type) with ON/OFF/Trip LED indication lamps and SCADA communication compatibility shall be provided and with necessary interconnection wiring - 1 Set

Overload current - 40% to 100% settable

Short circuit current - 1 to 8 times settable The Incomer terminal shall be extended with suitable length of

Aluminium strip to terminate incoming cable of size 4 Runs of 3.5C x 300 Sq.mm

3) OUTGOINGSs: a) 3P, 800A, 50kA, MCCB - 1 No

b) 3P, 630A, 36kA, MCCB - 1 No c) 3P, 400A, 36kA, MCCB - 1 No

All outgoing MCCB shall be with microprocessor release and with

following features,

Overload current - 40% to 100% settable

Short circuit current - 1 to 8 times settable Note:

1. Outgoing bus-bars shall be extended to cable chamber for all outgoing MCCBs.

2. All outgoing MCCBs shall be provided with ON/OFF/TRIP LED

indications.

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4) METERING SET (@ Incomer):

Consists of Current Transformers, (Multi Function Meter (harmonic & individual harmonic meter) with four row LED display + RS485

communication port similar to Elmeasure model: EN8400LM or equivalent), RYB LED indication lamps and 230V, 6A, control MCBs etc., - 1 Set

Earth fault relay with CBCT - Current rating : 1 to 10 Amps Time : 0.3 to 3 secs - 1 Set

5) METERING SET (@Outgoings): Consists of Current Transformers, Digital Ammeter - 1 Set Each

CURRENT TRANSFORMER: i). For 1600A ACB – Incomer:

A) TYPE : RING TYPE B) ACCURACY CLASS : CLASS 1.0

C) BURDEN : 15 VA D) INSULATION CLASS : CLASS - A

E) RATIO : 1600 / 5A F) CONFIRMATION TO : IS - 4201

ii). For 800A MCCB – Outgoing 1: A) TYPE : RING TYPE

B) ACCURACY CLASS : CLASS 1.0 C) BURDEN : 15 VA D) INSULATION CLASS : CLASS - A

E) RATIO : 800 / 5A F) CONFIRMATION TO : IS - 4201

iii). For 630A MCCB – Outgoing 2: A) TYPE : RING TYPE

B) ACCURACY CLASS : CLASS 1.0 C) BURDEN : 15 VA

D) INSULATION CLASS : CLASS - A E) RATIO : 630 / 5A F) CONFIRMATION TO : IS - 4201

iv). For 400A MCCB – Outgoing 3:

A) TYPE : RING TYPE B) ACCURACY CLASS : CLASS 1.0 C) BURDEN : 15 VA

D) INSULATION CLASS : CLASS - A E) RATIO : 400 / 5A

F) CONFIRMATION TO : IS - 4201

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GENERAL CONDITIONS:

1. Sheet metal thickness shall be 14SWG (min) and thickness of doors/covers shall be of 16SWG (min)

2. Enclosure shall be confirming to class IP -54.

3. Bus conductors shall be confirming to IS-5082. (a)Material : Aluminium Bus bar grade, E918

(b)Minimum Clearance : 25mm between phases, : 25mm between phases to earth : 19mm between neutral to earth.

(c)Bus bar supporting material : SMC/DMC

4. Powder coat paint of approved shade shall be applied as specified by department. Fire and corrosion resistant coating similar to VIPER FR 110 shall be applied in two coats with necessary primer inside the

panel.(i.e. inside the switch gear and bus bar chamber.)

5. Name plates suitable for fixing on the front side of the cubicles shall not be of size less than 100mm x 25mm.

6. The panel shall undergo seven tank processing system prior to painting.

7. The panel shall contain vertical bus bar of suitable cross section running throughout the height of the panel from sources and be

readily accessible. Horizontal it should have extendibility provision. 8. All cover Sheets shall be fixed by bolted type arrangement

and shall be openabe for maintenance.

9. Fire retardant DMC/SMC fillings for opening around the bus bars near section barriers. i.e. inter compartmental barrier.

10. The entire structure shall be mounted on a rigid base frame made of ISMC-100 channel.

11. All cubicle doors shall be of hinged type and door hinges shall be of concealed type. Cubicle doors shall have door provision for locking

the cubicles individually. All doors and covers shall be provided with gasket to make the compartments dust tight. Bolts with bakelite head and stop

washer shall be provided for locking of the Cubicle doors. 12. Cubicle door of the incoming, outgoing MCCBS shall be

mechanically interlocked with the switch gear to prevent unintentional openings of the door while the unit is in energized condition. However defeat

interlock provision is also to be provided for the Cubicle door. 13. The MCCB shall be provided with front operating handle and

ON / OFF position of switch handle be clearly marked.

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14. All control and indicating equipment such as meters,

indicating lamps, etc shall be mounted on the hinged doors of the cubicles identified for the door.

15.Internal wiring for measuring instruments shall be using be of 1100 V grade FRLS multi threaded copper conductor of minimum 2.5

sq.mm size PVC insulated wire and terminated in the respective terminal with the suitable crimping type socket . Wires shall be neatly bunched and

adequately supported so as to avoid sagging and strain on terminals. Wire identification tags/ Numbers shall be provided at both ends of wire terminations, in accordance with the approved wiring diagram.

16. Provision shall be made for permanently earthing the frames

and metal parts/ switches of the panel through tinned 25x3 mm copper strip earth bus for Change over panel running through all the compartments /cubicles of the panel. Two independent earth points shall be provided

outside of the panel, to connect, the panel with earth. All the cubicle doors shall be earthed/ connected to the main panel body through a suitable size

tinned flexible copper braided wire. All the bolted joints shall be suitable tinned.

17. Cable alley of the panel shall be provided with cable clamping arrangements throughout the height of the panel.

18. High tensile bolts, nuts and spring washers shall be provided

at all bus bars joints if any. 19. All bus bars and tapping shall be provided with color coded

heat shrink sleeves for phase identifications.

20. All joints /tapping points of bus bars shall be suitably shrouded to prevent accidental contact. Bus bar tapping inside the MCCB/MCBs cubicles shall be covered with FRP sheets to prevent accidental

contacts and heat resistances fire resistances coating shall be applied inside all the switch cubicles.

21. Eye hooks of suitable size and quantity for lifting /transporting the entire panel shall be provided on the top of the panel.

22. Ventilation louvers covered with Micro holed mesh should be

provided at the bottom and top, on sides of in comer cubicles, & busbar chambers, for cross ventilations.

23. All the Panels shall have access to all termination/busbars joints for facilitating maintenance from front side of the panel.

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24. Interconnection between Busbar & MCCBs shall be as follows, Incoming 1600A ACB - 2400 Sq.mm TPN AL bus bar.

800 A MCCB - 1200 Sq.mm TPN AL bus bar. 630 A MCCB - 945 Sq.mm TPN AL bus bar. 400 A MCCB - 600 Sq.mm TPN AL bus bar.

The incoming ACB shall have suitable extended busbar for easy termination of AL conductor UG cables.

25. DRAWING: General arrangement drawing for Facility MV

Panel with size of 2250(L) x 2400(H) x 1000(D) is enclosed herewith as Drawing.No.03 for reference.

The following drawings with required details shall be submitted

for Dept. approval before Starting fabrication of panel.

(a) Preliminary outline dimensional drawing of the panel showing

general arrangement indicating the following, 1) Bus bar clearance and supporting arrangement details with configuration of bus bars.

2) General arrangement of switch gears, CTS etc 3) Cable alley details with cable termination and supporting

arrangement. 4) Power cable entry point/ details, Earthing etc

(b) Single line diagram of panel showing switch gear, protection accessories metering etc.

(c) Control wiring diagram indicating ferrule/ terminal numbers

clearly marked. 26. INSPECTION: Facility MV Panel shall be tested at factory

as per relevant IS in the presence of department engineer before dispatch of the Panel.

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ANNEXURE-3 (For Sl.No.16)

TECHNICAL SPECIFICATIONS FOR 2000 Amps ALUMINIUM BUSDUCT

SCOPE OF WORK:

1. This specification covers the requirements of 3 phase 415 V, 50 Hz, 2000 Amps continuous

rated, Aluminium TPN air insulated type bus duct with enclosure suitable for indoor / outdoor

type. The size of neutral bus bar shall be same size as that of phase bus bar. Aluminium

bus bar shall be tinned at the point of intersections, joints, ends, etc.,

2. Bus bar sizes shall be as follows:

Phase – not less than 3000 Sq.mm Aluminium

Neutral – not less than 1500 Sq.mm Aluminium

Earth bus – 2 Runs x 50 x 6 mm Copper Strip

3. Earth bus of 2 runs of 50 mm x 6 mm copper shall run on the external side of the busduct

through the whole length of the busduct and shall be positively connected to the body of the

busduct enclosure. At both ends of the earth bus provision shall be made to connect it to

main earthing system.

4. The busduct shall be provided with flanged ends to connect the busduct to transformer at

one end and LT panel at other end. These flanges shall match with corresponding flanges in

the equipment to which these are connected.

5. Adapter chamber to suit the size of transformer bus duct end box and LT panel shall be

provided as per the site condition. 90 degree bends if required shall be provided as per the

site condition. To match the phase sequence of the two equipments connected by bus duct,

a suitable phase cross over chamber shall be provided if required, at suitable location.

6. The bus duct shall be designed for the above current ratings and for an ambient

temperature of 50°C (for indoor) and 55°C (for outdoor). The short time withstand current

shall be 50 kA for 1 sec. Under Normal operating conditions, the surface temperature of the

enclosure shall not exceed 80°C (i.e., the temperature rise shall be limited to 30°C.)

7. 2000A TPN Bus-Bar will be of high conductivity anodized aluminum of at least 99% purity

19501 grade and shall carry maximum specified continuous current &Short circuit with stand

shall be of 150KA per I sec. The busbar’s Ambient Temperature 40 Deg C. Temperature

rise 55 Deg C as per IEC 61439.

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8. The busbars shall be of uniform cross section along its entire length. No tapering of the bus

bars cross-section is allowed. Tinned copper flexible set of same bus bar current size shall

be provided at transformer end and switchboard end. The bus duct shall be supplied

complete with all the hardware necessary for making the terminations. All hardware shall be

cadmium plated. The bolts shall be full threaded and high tensile quality. Belleville washers

for all current carrying conducting parts of the busbars and plain washers for enclosure and

covers shall be provided for every bolt.

9. The enclosure of bus duct shall be of 14 SWG sheet steel of minimum thickness of 2 mm

CRCA sheet Steel and it shall be supported on a galvanized angle iron / structural steel

framework. The Busduct shall be of box frame construction of sheet steel enclosure suitably

braced to withstand the maximum mechanical and electro dynamic forces. The section of

the busduct shall be rectangle & non-phase segregated. The busduct shall have fire barriers

inside. Rain hood shall be provided as an additional protection for outdoor installation.

Canopy and proper fixing arrangements shall be provided for the same.

10. The bus duct shall be painted after suitable pretreatment (seven tank processing) of all

structural steel and plates with anti-corrosive epoxy base primer paint & two coats of anti-

corrosive epoxy base paint externally with a colour of pebble / flint gray shade RAL 7032and

dried in an oven. The enclosure shall conform to IP: 65 for outdoor and IP: 54 for indoor,

as per relevant Indian Standards. Inner surface of the bus – duct shall be coated in the

black matt colour for heat dissipation.

11. The joints in the bus –bars shall be of the bolted type and it shall be ensured that the

following precautions are observed.

i. The contact pressure must be ample and this shall be maintained during the time the

panel is in service.

ii. The surfaces of the conductors must be clean.

iii. With flat conductors, the overlap should be equal to or greater than the width of the bars

or ten times the thickness of the bar whichever is greater.

iv. The joints shall be treated by the application of joint compound to render the joint

moisture-proof.

v. For the joints use of bolts of cadmium plated high-tension MS bolts having expansion

characteristics due to temperature change similar to the conductor may be used with steel

nuts.

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vi. Smearing the surfaces with oxide inhibiting grease just prior to making the joint in order

to preserve the efficiency of the joints. Minimum phase and earth clearance required shall

be maintained at joints. The joints shall be thoroughly shrouded.

12. The bus bar arrangement shall generally confirm to IS: 5578 and IS: 11353. The bus duct

shall be also supplied with suitable earth bus running all along the length of the bus – duct

made of copper strips.

13. The busbars shall be phase identified by colour coded heat shrinkable PVC sleeves. Colour

code shall be RED, YELLOW and BLUE for phase and BLACK for the neutral bus – bar.

14. Bus bars shall be supported on tough, non-hygroscopic, resin bonded self-extinguishing fire

retardant insulators preferably of SMC / DMC with ribbed construction to prevent tracking

due to dust paths. Bus bars and supports shall withstand the maximum stresses that are

induced in the event of the short-circuit currents being as specified herewith. The bus bar

support shall be at a minimum interval of 450mm.

15. The bus bars shall be supplied with flexible expansion joints at both the ends. The supports

and expansion arrangement shall be so chosen to avoid undue stress to the bus bars,

supports and end connections.

16. The bus duct shall be provided with removable top covers fitted with gaskets secured by

sufficient number of nuts, bolts to ensure that these covers are dustproof. At the wall

crossing of the busduct, there should not be removable type inspection cover. Proper wall

sealing arrangements shall be provided at the wall where bus duct enters the substation

building.

17. All joints and covers shall be provided with non-deteriorating type gaskets of neoprene

between joints. These covers shall be of suitable length for ease of removal and shall be

arranged to give complete accessibility to the bus bars, joints, bends and supports, etc. The

entire bus duct shall be dust and vermin proof. Louvers shall not be provided.

18. Busduct shall be provided with anti-condensation space heaters with controlling thermostats

of adequate capacity to maintain internal temperature above dew point to prevent moisture

condensation in busduct. Space heaters shall be rated for 240V, single phase, 50 Hz AC

supply. Space heater shall be provided on both sides of the fire barrier.

19. The clearance between the individual bare phase power bus bars and between the phase

and earth bus bars in air shall be not less than 25 mm and 19 mm respectively. However

adequate creepage distance shall be available on insulator to operate under high humid

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conditions and effects of condensed moisture due to variations in temperature within

busduct due to different conditions of loading.

20. Filter type drain holes / points shall be provided at die bottom of the bus – duct, at suitable

locations for draining out condensed moisture. The filter element shall be such that it will

allow escape of moisture but prevent ingress of dust. This shall be removable type for

cleaning purposes. The bus duct shall be provided with silica gel breathers at adequate

locations as per the site conditions / manufacturers recommendations.

21. The design of busduct enclosure shall be such that it will withstand the operating conditions

arising out of the following:

(a) Normal operating conditions

(b) Momentary short circuit currents

(c) Rigours of adverse weather conditions, and

(d) Combinations of above.

* * * * *

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Annexure – 4 (For Sl.No:17)

SPECIFICATION FOR SUBSTATION MV PANEL:

Supply of Medium voltage panel suitable for operation on 415 volts, 3 phase 4 wire 50HZ, AC supply system, to withstand a short circuit level of 50 kA RMS symmetrical and suitable for AC 23 duty. The Main MV panel shall

be fabricated with 14 gauge CRCA sheets for free standing, floor mounting, front hinged for indoor use, cubicle type, side/ back covers removable, a

removable bottom gland plates for incoming and outgoing connections, dust and vermin proof, with TPN aluminum bus bars, complete with internal

wiring, ferrules, name plates, painting etc., and having the specification / technical particulars given below.

MEDIUM VOLTAGE PANEL CONSISTING OF:

1) BUSBAR: 2000 Amps TPN aluminum bus bar of capacity 3000 Sq.mm Bus bar for phase & 1500 Sq.mm Bus bar for Neutral (suitable for 50 KA fault level) and with copper earth bar 25x3mm (tinned) - 1 Set

2) INCOMING WITH METERING CUBICLE: 2000A, TP, 50 kA ACB (EDO

Type) with ON/OFF/Trip LED indication lamps and SCADA communication compatibility shall be provided and with necessary interconnection wiring - 1 Set

Overload current - 40% to 100% settable

Short circuit current - 1 to 8 times settable The Incomer terminal shall be extended with suitable length of

Aluminium strip to terminate incoming Bus duct of size 3000 Sq.mm TPN.

3) OUTGOINGSs: a) 3P, 1600A, 50kA, ACB (MDO type) - 1 No a) 3P, 800A, 50kA, ACB (MDO type) - 1 No

b) 3P, 630A, 50kA, MCCB - 2 Nos c) 3P, 400A, 50kA, MCCB - 2 Nos

All outgoing MCCB shall be with microprocessor release and with

following features,

Overload current - 40% to 100% settable

Short circuit current - 1 to 8 times settable Note:

1. Outgoing bus-bars shall be extended to cable chamber for all outgoing ACBs & MCCBs.

2. All outgoing ACBs & MCCBs shall be provided with ON/OFF/TRIP LED

indications.

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3. Outgoing 1600A & 800A ACBs shall be provided with R/Y/B LED indications.

4) METERING SET @ Incomer:

Consists of Current Transformers, (Multi Function Meter (harmonic & individual harmonic meter) with four row LED display + RS485 communication port similar to Elmeasure model: EN8400LM or equivalent),

RYB LED indication lamps and 230V, 6A, control MCBs etc., - 1 Set

Earth fault relay with CBCT - Current rating : 1 to 10 Amps Time : 0.3 to 3 secs - 1 Set

5) METERING SET @ Outgoing 1600A & 800A ACBs: Consists of Current Transformers, Digital Ammeters, RYB LED indication

lamps and 230V, 6A, control MCBs etc., - 1 Set Each

CURRENT TRANSFORMER i). At 2000A ACB – Incomer:

A) TYPE : RING TYPE B) ACCURACY CLASS : CLASS 1.0

C) BURDEN : 15 VA D) INSULATION CLASS : CLASS - A E) RATIO : 2000 / 5A

F) CONFIRMATION TO : IS - 4201

ii). At 1600A ACB – Outgoing 1: A) TYPE : RING TYPE B) ACCURACY CLASS : CLASS 1.0

C) BURDEN : 15 VA D) INSULATION CLASS : CLASS - A

E) RATIO : 1600 / 5A F) CONFIRMATION TO : IS - 4201

iii). At 800A ACB – Outgoing 2: A) TYPE : RING TYPE

B) ACCURACY CLASS : CLASS 1.0 C) BURDEN : 15 VA D) INSULATION CLASS : CLASS - A

E) RATIO : 800 / 5A F) CONFIRMATION TO : IS - 4201

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GENERAL CONDITIONS:

1. Sheet metal thickness shall be 14SWG (min) and thickness of doors/covers shall be of 16SWG (min)

2. Enclosure shall be confirming to class IP -54.

3. Bus conductors shall be confirming to IS-5082. (a)Material : Aluminium Bus bar grade, E918

(b)Minimum Clearance : 25mm between phases, : 25mm between phases to earth : 19mm between neutral to earth.

(c)Bus bar supporting material : SMC/DMC

4. Powder coat paint of approved shade shall be applied as specified by department. Fire and corrosion resistant coating similar to VIPER FR 110 shall be applied in two coats with necessary primer inside the

panel.(i.e. inside the switch gear and bus bar chamber.)

5. Name plates suitable for fixing on the front side of the cubicles shall not be of size less than 100mm x 25mm.

6. The panel shall undergo seven tank processing system prior to painting.

7. The panel shall contain vertical bus bar of suitable cross section running throughout the height of the panel from sources and be

readily accessible. Horizontal it should have extendibility provision. 8. All cover Sheets shall be fixed by bolted type arrangement

and shall be openabe for maintenance.

9. Fire retardant DMC/SMC fillings for opening around the bus bars near section barriers. i.e. inter compartmental barrier.

10. The entire structure shall be mounted on a rigid base frame made of ISMC-100 channel.

11. All cubicle doors shall be of hinged type and door hinges shall be of concealed type. Cubicle doors shall have door provision for locking

the cubicles individually. All doors and covers shall be provided with gasket to make the compartments dust tight. Bolts with bakelite head and stop

washer shall be provided for locking of the cubicle doors. 12. Cubicle door of the incoming, outgoing MCCBS shall be

mechanically interlocked with the switch gear to prevent unintentional openings of the door while the unit is in energized condition. However defeat

interlock provision is also to be provided for the cubicle door. 13. The MCCB shall be provided with front operating handle and

ON / OFF position of switch handle be clearly marked.

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14. All control and indicating equipment such as meters,

indicating lamps, etc shall be mounted on the hinged doors of the cubicles identified for the door.

15.Internal wiring for measuring instruments shall be using be of 1100 V grade FRLS multi threaded copper conductor of minimum 2.5

sq.mm size PVC insulated wire and terminated in the respective terminal with the suitable crimping type socket . Wires shall be neatly bunched and

adequately supported so as to avoid sagging and strain on terminals. Wire identification tags/ Numbers shall be provided at both ends of wire terminations, in accordance with the approved wiring diagram.

16. Provision shall be made for permanently earthing the frames

and metal parts/ switches of the panel through tinned 25x3 mm copper strip earth bus for Change over panel running through all the compartments /cubicles of the panel. Two independent earth points shall be provided

outside of the panel, to connect, the panel with earth. All the cubicle doors shall be earthed/ connected to the main panel body through a suitable size

tinned flexible copper braided wire. All the bolted joints shall be suitable tinned.

17. Cable alley of the panel shall be provided with cable clamping arrangements throughout the height of the panel.

18. High tensile bolts, nuts and spring washers shall be provided

at all bus bars joints if any. 19. All bus bars and tapping shall be provided with color coded

heat shrink sleeves for phase identifications.

20. All joints /tapping points of bus bars shall be suitably shrouded to prevent accidental contact. Bus bar tapping inside the MCCB/MCBs cubicles shall be covered with FRP sheets to prevent accidental

contacts and heat resistances fire resistances coating shall be applied inside all the switch cubicles.

21. Eye hooks of suitable size and quantity for lifting /transporting the entire panel shall be provided on the top of the panel.

22. Ventilation louvers covered with Micro holed mesh should be

provided at the bottom and top, on sides of in comer cubicles, & busbar chambers, for cross ventilations.

23. All the Panels shall have access to all termination/busbars joints for facilitating maintenance from front side of the panel.

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24. Interconnection between Busbar & MCCBs shall be as follows, Incoming 2000A ACB - 3000 Sq.mm TPN AL bus bar.

1600 A ACB - 2400 Sq.mm TPN AL bus bar. 800 A ACB - 1200 Sq.mm TPN AL bus bar. 630 A MCCB - 945 Sq.mm TPN AL bus bar. 400 A MCCB - 600 Sq.mm TPN AL bus bar.

The incoming ACB shall have suitable extended busbar for easy termination of AL conductor UG cables.

25. DRAWING: General arrangement drawing for Substation

MV Panel with size of 5200(L) x 2100(H) x 1000(D) is enclosed herewith as Drawing.No.02 for reference.

The following drawings with required details shall be submitted

for Dept. approval before Starting fabrication of panel.

(a) Preliminary outline dimensional drawing of the panel showing

general arrangement indicating the following, 1) Bus bar clearance and supporting arrangement details with configuration of bus bars.

2) General arrangement of switch gears, CTS etc 3) Cable alley details with cable termination and supporting

arrangement. 4) Power cable entry point/ details, Earthing etc

(b) Single line diagram of panel showing switch gear, protection accessories metering etc.

(c) Control wiring diagram indicating ferrule/ terminal numbers clearly marked.

26. INSPECTION: Substation MV Panel shall be tested at

factory as per relevant IS in the presence of department engineer before dispatch of the Panel.

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ANNEXURE - 5

LIST OF ITEMS WITH DETAILED TECHNICAL SPECIFICATIONS

S.No. Item description

1

Supply of 11 kV, 3C x 95 Sq.mm, stranded, aluminium conductor, XLPE insulated, PVC bedded, galvanized flat steel/strip armoured and PVC overall sheathed, screened cables, conforming to IS:7098 Part II(with latest amendments) suitable for earthed system. The cable shall bear ISI certification mark.

2

Laying of 2Runs x 3C x 95sq.mm, 11kV, aluminium conductor XLPE cables in ground ,in all kind of soil, 1000mm below ground level including transportation of cable to site, excavation, refilling with sand and baked bricks on sides and 225 x 450 x 40 mm size RCC slabs on top, providing cable route / joint markers complete and as per drawing no.CED/ELE/S/9 and 10.

3

Laying of 2Runs x 3C x 95sq.mm, 11kV, aluminium conductor XLPE cables in existing trench / on cable tray / on wall / floor / ceiling / above false ceiling including transportation to site, removing of trench/ false ceiling covers and reclosing the covers after laying the cables in good condition with supply of all necessary materials such as brackets, clamps, MS spacers complete as required and as directed by Engineer-in-charge.

4 Providing end terminations for 3C x 95sq.mm (outdoor), 11kV, Aluminium conductor XLPE cable including supply of heat shrinkable (3M or Raychem) joints based end termination kit with all items complete as required and as directed by Engineer-in-charge.

5

Supply, Installation, Testing & Commissioning (SITC) of 1250kVA, 3 phase, 11000/433V, 50 Hz outdoor type, oil immersed, naturally oil cooled, copper wound, plinth/ floor mounted, delta/star connected Dyn11, ONAN cooling, core type Transformer. Detailed Technical Specifications of 1250 kVA transformer is enclosed as Annexure-1.

6

Supply of front operated cubicle type free standing, LT panel (Facility MV panel) suitable for operation on 415V, 3 Phase, 4 wire, 50Hz, AC supply system and to withstand a short circuit level of 50kA rms symmetrical. Main MV Panel: The panel shall consist of the following :- Incoming:- 1600A, TPN motorised (EDO type) ACB (50kA) with microprocessor based numerical releases for O/L, S/C & EFR protections: 1 No. Bus Bar:- Phase - 2400 Sq.mm, Neutral - 1200 Sq.mm Outgoing:-(MCCB with microprocessor based communicable with numerical releases for O/L & S/C protection) 1. 800A TP (50kA) MCCB - 1 No. 2. 630A TP (36kA) MCCB - 1 No. 3. 400A TP (36kA) MCCB - 1 No. Spare cubicles - 1 No. Detailed Technical Specifications of Facility MV panel is enclosed as Annexure-2.

7 Installation, Testing and commissioning of Facility MV Panel (under sl.no.06 above) with ISMC 100 channel including supply of channel, cutting, welding and supply of all installation materials as per specifications and complete and as directed by Engineer-in-charge.

8

Providing 1 No of maintenance free earthing (MFE) comprising of copper bonded stainless steel alloy rod with clamps of 10 feet depth x 5/8 inch diameter suitably made of copper alloy including supply of copper rods, suitable clamps for connecting body earthing strips and all other accessories required for the total erection of the earthing system. The copper bonded rod shall have copper bonding thickness of 250 microns (minimum). The work also involves construction of earth chamber with cover. The rod shall be driven in earth with augured hole dia of 75-100mm in ground. The conductivity / earth enhancement compound similar to GEM of M/s Erico or equivalent filled around the copper rod to a depth of not less than 2.5 mtrs from ground level. The remaining depth shall be compacted with garden soil/ black soil for complete erection of the total system including civil works like construction of earth chamber with RCC cover slab as required and as directed by Engineer in charge.

9

Providing standard plate earth for earth station with 600x600x3.15mm electrolytic copper plate, conforming to IS:3043 with latest amendments and as per drawing No.CED/ELE/S/4 including supply of all materials and providing chamber complete as required. ''Note: 1) Copper plate shall be tinned. 2) Rate of earth station includes the cost of suitable medium class GI pipe for watering.'' with 2.5m depth with copper plate

10

Supply and laying of 50 x 6 mm size GI strip including supply and fixing using GI spacers, saddles, welding with all fixing materials required and when laid inside the building and inclusive of excavation & refilling of earth when laid outside the building and welding of all the joints & terminations interconnections with earth pit and equipment, terminations/ interconnections in an approved manner as per IS 3043 (with latest amendments) inclusive of supply of all hard wares complete as required.

11 Supply and laying of 50 x 6 mm size CU strip including supply of fixing clamps and accessories when laid inside the building and inclusive of excavation & refilling of earth when laid outside the building and tinning of copper wires, interconnections with earth pit and

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equipment, terminations/interconnections in an approved manner as per IS 3043 (with latest amendments) inclusive of supply of all hard wares complete as required.

12

Supply of INSULATING MAT made of elastomer for use as floor covering for the protection of operating personnel suitable for electrical installation with the system voltage up to 3.3kV supply. Mat shall be resistant to acid, oil etc. Mat shall be made from elastomer material free from any insertions leading to deterioration of insulating properties. Upper surface of the insulating mat shall have small aberration Minimum thickness of the mat shall be not less than 2.00mm. Mat shall have excellent mechanical properties to withstand load and movement of breaker of trolleys, other associated electrical accessories of 440V system. Mat shall be suitable for pasting on floor with the help of special rubber based adhesive. Insulating mat shall be of 1000m width throughout the length and conforming to IS 15652:2006 with latest amendments.

13

Supply and coating of Fire Resistant Compound of water based thermoplastic resin, Flame Retardant chemicals and inorganic incombustible fibers for coating on the cables to withstand severe Fires and to prevent propagation along horizontally and vertically laid cables on wall or on cable trays under high temperature conditions. The compound shall be similar to ''VIPER CABLEMASTIC FR-903'' complete as required and as directed by Engineer-in charge. (To be coated on the cable for 1.5 mtr length from end terminations and 1 Mtr length for every 10 mtr. interval of exposed cable)

14

Service charges for removing of existing old 750kVA transformer ,existing AVR panel and AVR transformer of size (5 Mtr (L) x 1.6 Mtr (W) x 1.4 Mtr (H)) inside weather proof enclosure and removing of HT, LT and control cable end termination connections including earthing connections as required and as directed by EIC. (At M5(i) S/S yard). All the removed old materials shall be returned to department stores.

15 Service charges for providing two coatings of aluminium paint in weather proof enclosure of size (7.4 Mtr (L) x 2.4 Mtr (W) x 2.4 Mtr (H)) and including supply of aluminium paint as required and as directed by EIC. (At M5(i) S/S yard - 1 Set).

16

Supply of 3 phase, 415 V, 50 Hz, 2000 Amps continuous rated, Aluminium TPN busduct with enclosure suitable for indoor / outdoor type. The size of neutral bus bar shall be half the size of phase bus bar. ''Bus bar sizes shall be as follows: Phase – not less than 3000 Sq.mm Aluminium, Neutral – not less than 1500 Sq.mm Aluminium, Earth bus – 2 Runs x 50 x 6 mm copper Strip. Detailed Technical Specifications of 2000 Amps AL Bus Duct is enclosed as Annexure-3.

17

Supply of front operated cubicle type free standing, LT panel (Substation MV panel) suitable for operation on 415V, 3 Phase, 4 wire, 50Hz, AC supply system and to withstand a short circuit level of 50kA rms symmetrical .''Main LT Panel: The panel shall consist of the following :- Incoming:- 2000A, TPN motorised (EDO type) ACB (50kA) with microprocessor based numerical releases for O/L, S/C & EFR protections: 1 No. Bus Bar:- Phase - 3000 Sq.mm, Neutral - 1500 Sq.mm Outgoing:- (MCCB with microprocessor based communicable with numerical releases for O/L & S/C protection) 1. 1600A TP (50kA) ACB (MDO type) - 1 No. 2. 800A TP (50kA) ACB (MDO type) - 1 No. 3. 630A TP (50kA) MCCB - 2 Nos. 4. 400A TP (50kA) MCCB - 2 Nos. Spare cubicles - 4 No. Detailed Technical Specifications of Substation MV panel is enclosed as Annexure-4.

18 Installation, Testing and commissioning of Substation MV Panel (under sl.no.17 above) with ISMC 100 channel including supply of channel, cutting, welding and supply of all installation materials as per specifications and complete and as directed by Engineer-in-charge.

19 Supply of 3.5C x 300 Sq.mm Al UG cable size UG cables, 1.1kV grade, XLPE insulated, and overall sheathed, stranded aluminium conductor, flat steel strip armoured cables conforming to IS: 7098/ Part I (with latest amendments). The cable shall bear ISI certification mark.

20

Laying of 2 Runs of 3.5C x 300 Sq.mm UG cable 1.1 kV grade of following size XLPE cables armoured, aluminium conductor cables in ground, in all kinds of soil, 750mm below ground level including transportation of cable to site, excavation, refilling with sand and baked bricks on top and sides and providing cable route / joint markers complete as per specifications and as per drawing no.CED/ELE/S/8 and 10.

21

Laying of 2 Runs of 3.5C x 300 Sq.mm, 1.1 kV grade of XLPE cables armoured, aluminium conductor cables in existing trench / on cable tray, on wall / floor / ceiling /above false ceiling / below false floor including transportation of cable to site, removing of trench /false ceiling/ false flooring covers and reclosing the covers after laying the cables in good condition with supply of all necessary materials such as brackets , clamps , MS spacers complete as required and as directed by Engineer-in charge. (supports should be available for every 450mm)

22

Laying of 3 Runs of 3.5C x 300 Sq.mm UG cable 1.1 kV grade of following size XLPE cables armoured, aluminium conductor cables in ground, in all kinds of soil, 750mm below ground level including transportation of cable to site, excavation, refilling with sand and baked bricks on top and sides and providing cable route / joint markers complete as per specifications and

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as per drawing no.CED/ELE/S/8 and 10.

23

Laying of 3 Runs of 3.5C x 300 Sq.mm, 1.1 kV grade of XLPE cables armoured, aluminium conductor cables in existing trench / on cable tray, on wall / floor / ceiling /above false ceiling / below false floor including transportation of cable to site, removing of trench /false ceiling/ false flooring covers and reclosing the covers after laying the cables in good condition with supply of all necessary materials such as brackets , clamps , MS spacers complete as required and as directed by Engineer-in charge. (supports should be available for every 450mm)

24

Providing end terminations for 3.5C x 300 Sq.mm, 1.1 kV grade XLPE insulated, armoured, aluminium conductor cables including supply of cable gland, lugs, neoprene bushes and other materials and tolls required complete with terminal connections, earthing of glands and as required and as directed by Engineer-in-charge.