WBPHE/EE/SMD/NIeT-12 of 2024-25/6

Amount

Dismantling and taking out the defective accessories, therefrom the transformers [Outdoor: 7500 KVA x 2 nos (TR-1-Sl. No. M2670/1 & TR-2-Sl. No. M2670/2-TR-2) + Indoor: 800 KVA x 2 nos. (TR-1-Sl. No. 142G8 & TR-2-Sl. No. 142G9)] including OLTC and the relevant HT/LT panels (6.6 KV side and 0.433 KV side), battery charger panel along with the old existing battery bank etc. by engaging skilled technician accompanied by competent personnel and applying necessary T&P after disconnecting the power line including taking proper precautionary measures as per direction of EIC.

Panels

Supply & delivery of the following materials as per sample at site:-

Auxiliary tripping relay (110-125V DC) (Model-VAA33ZG8338BCH) (Make-GE)(1 no. for O/G of TR-1 and 2 nos. for O/G of TR-2)

Indicating Lamp (LED) (For feeders viz. RWPH-1&2-4 nos each, Aux. TR-1&2-6 nos each, CWPH-1&2-6 nos each, Incomer-1&2-6 nos each, Bus coupler-6 at HT side and Incomer-1&2-2 nos each, WTP2-3 nos at LT side)

Trip Neutral Close (TNC) switch (25A, 260V) (Model-BCA02P00612715)(Make-Kaycee)(For feeders viz. RWPH-1&2-1 no each, Aux. TR-1&2-1 no each, Incomer-2-1 no at HT side)

Auxiliary plug in relay (110V, DC, 4P)(For feeders viz. RWPH-1&2-1 no each, Aux. TR-1&2-1 no each, CWPH-1&2-1 no each, Incomer-1&2-1 no each, Bus coupler-1 at HT side)

Power factor meter (Aux. voltage-230V, AC)(Model-BR6000, Make-Epcos)

50KVAR Capacitor (For Capacitor bank panel)

25KVAR Capacitor (For Capacitor bank panel)

100A TP Power contactor (For Capacitor bank panel)

63A TP Power contactor (For Capacitor bank panel)

Analog voltmeter (0-500V)(Make-AE)(For Battery charger panel)

Gate lock (For Battery charger panel)

6-Window alarm announciator (Make-Minilec)

Fitting & fixing of the above supplied materials (Item No. 2.01-2.12) in position including supplying of requisite wiring materials required for necessary interconnection complete along with the calibration charges wherever applicable.

Transformers/OLTCs

Supply & delivery of the following materials as per sample at site:-

Glass for marshalling box (For Outdoor TR-1)

Glass for OLTC gate (For Outdoor TR-1)

Silica gel (For Outdoor TR-1&2 and Indoor TR-1&2 ) [(2x2+2x1) Kg]

Control transformer for OLTC (Ratio: 433/55, VA: 250)(1 no. supply only)

2000A Bushing (For Outdoor TR-1&2)

Rotary switch for tap changing

Tap clock for OLTC tap changing (1-17)

Magnetic oil gauge (MOG)(For Outdoo TR-1&2)

All kinds of gaskets and oil seals including jointing materials like adhesive etc. in connection with the top cover, inspection cover, conservator tank, radiator, buchholz relay, drain valve, OLTC top cover, HT/LT bushings etc. for the following transformers:-

7500 KVA x 2 nos (For TR-1&2)

800 KVA x 1 no (For TR-1&2)

Fitting & fixing of the above supplied materials (Item No. 4.01-4.02 & 4.04-4.09) and replacement of silica gel (Item no. 4.03) in position including supplying of requisite wiring materials, jointing materials etc. required for necessary interconnection complete along with the calibration charges wherever applicable. This cost includes disconnecting the transformers (7500 KVA x 2 nos + 800 KVA x 2 nos) from HT & LT terminals with proper protection, draining the transformer oil out succeeded by storing the same in proper way, opening the top cover and inspection cover after removal of conservator tank, buchholz relay with the OLTC top cover, radiators, drain valves and HT/LT bushings etc. part by part after loosening all the nuts & bolts and replacement of all worn out gaskets/oil seals by new ones to prevent all leakages.

Dismantling the OLTC units and comprehensive servicing thereof including tightening the fixed and moving contact, adjusting roller alignment, complete removal of insulating parts followed by improvement of IR, greasing of motor bearing sprocket, and rectification of alignment of tap changer sprocket & bearing complete.

Re-filling the oil through the transformer oil filtration machine into the transformers (7500 KVA x 2 nos + 800 KVA x 2 nos) by engaging competent manpower for the sake of attaining the desired IR value [{4800(TR)+730(OLTC)+250(Conservator tank)}x2 + {630(TR)+50(OLTC)+100(Conservator tank}x2]

Transportation charges for carrying the oil filter machine, BDV test set etc. including loading and unloading.

Making necessary connection of the said transformers (7500 KVA x 2 nos + 800 KVA x 2 nos) at HT & LT sides after cleaning, washing and tightening up the cable end socket and wrapping with new adhesive and insulation tapes.

Carriage of all spares to be replaced, from Kolkata to work site including loading & unloading charges.

Miscellaneous

Gas filling into the non-functional SF6 Gas circuit breakers after thorough inspection and checking out followed by checking control operation on load (36 KV, 1250 A, Type: 30-SFGP-25A).

Supply & delivery of the following materials at site:-

110V, 100AH VRLA Battery consisting of 55 nos x 2V cells with all accessories (Exide/Approved make) (Cost of battery is considered after deducting the value of old one).

Self priming monoblock dewatering pump set, coupled with 1.5 HP, AC 220V, 2900 RPM single phase motor having the following specifications, for bailing the water out, as accumulated in the pit beneath the 7500 KVA transformers whenever required:-

Size (Suction x Delivery) - 25 mm x 25 mm

Head range - (10 mtr - 52 mtr)

Discharge range - (3960 LPH - 360 LPH)

(Model : MEGA-54S, Make-Kirloskar/Eqivalent type of any other departmental approved make)

Installation of the battery bank (Item No. 12.01) in position including necessary interconnection complete.

Testing the installed units as mentioned above on load up to entire satisfaction of EIC.

Supply & delivery of the following materials at site :-

Office table with 3 drawers on right side of Size: 36” x 24” x 30” [Make: Raj & Raj / Khaitan/ Steelco Syndicate/ any other make].

PVC chair with arm as per choice of EIC [Make: Supreme/Nilkamal/National].

Add GST @ 18%

M/S.S.S.ENTERPRISE

DAS ENTERPRISE