REPAIR/MAINT OF HT INSTALLATION HT VCBS HT CABLES AND DISTRIBUTION TRANSFORMERS AT JALAPAHAR UNDER AGE (I) DARJEELING

Amount

Material and labour in repair for mechanically gang operated air break switch 11KV mounted on 12 nos. insulator and steel frame with operating mechanism worked from ground level complete with drop out fuse (set of three) of rating 400 amps.

Servicing / calibration / trouble shooting / repairing / adjustment of over current relay, earth fault relay, Spring, spring charge mechanism, close coil, trip coil, including connected accessories cleaning of all contacts with CTC, of the 11KV HT VCB panel of 630A, 50 Hz by qulified technical personel to make functional in all respects including identifying the deffective parts.

Supply and fixing following spares in repairs suitable for 11KV HT VCB of maximum short circuit current rating 25/26.3 KA 630A/400A after taking down the old spares all as specified and directed.-

LED indicating lamps R/Y/B

LED indicating lamps amber

LED indicating lamps white

Trip circuit push button with NO contracts.

Limit switch

Tripping Coil assembly

Closing Coil assembly

Gear Assembly

PT fuse

12NO + 12NC auxiliary Contact

Space heater

Thermostat

HRC control fuse 2A, 4A, 6A 10A

Holding catch assembly

Breaker controler Switch

ON/OFF push button plate assembly

Breeze rectifier

Fuse base with carrier

Test & service Limit switch

Single phase power pack with capacitor backup, 110V DC

Spring Charge motor coil Supply 230V AC

Space Heater

Earthing complete with galvanized steel earth plate electrode 600x600x6 mm thick buried directly in ground (earth pit not less than 2.25 m deep below normal ground level) with top edge of the plate not less than 1.5 m below normal ground level connected to galvanized earth strip 32 x 6 mm (up to 7.5 m in length from earth plate ) by means of bolts and nuts checknuts and washers of galvanized iron or steel all as specified and shown in electrical plate no 3 of SSR part I including necessary excavation and earth work in any type of soil PCC 1:3:6 type C1 chamber with RCC 1:2:4 type B1 40 mm thick cover with MS rod 8mm dia 150mm long reinforcement, watering funnel, 40 mm dia light grade for protection of earth electrode 20 mm dia for watering all as specified and directed and tested on completion all as specified and directed.

Disconnecting and removing transformer from mounting platform/structure after disconnecting HT/LT side cable connections, draining out transformer oil for repair/periodical maint of transformer of following capacity all as directed by Engr - in- Charge.

BLANK

50 KVA to 100 KVA

150 KVA to 200 KVA

250 KVA to 350 KVA

400 KVA to 500 KVA

Disconnecting and removing transformer from mounting platform after disconnecting HT/LT side cable connections and transporting of unserviceable transformer for rewinding from MES sub station to contractors/civil workshop and vice versa by arrangement of necessary crane for taking down loading / unloading and refixing at site of following capacity all as specified and directed.:-

50 KVA to 100 KVA

150 KVA to 200 KVA

Opening the top cover lid and taking out the core with winding by means of Crane/Chain Pulley without any damage to core and winding after disconnecting all internal connection of coil with outgoing/incoming terminals and keeping aside for periodical maint such as cleaning of transformer core and winding, cleaning of oil tank, repair/replacement of unserviceable /Burnt parts of following capacity all as specified and directed by Engr -in-Charge.

50 KVA to 100 KVA

150 KVA to 200 KVA

250 KVA to 300 KVA

400 KVA to 500 KVA

Periodical maint of transformer such as cleaning of core and winding by means of washing by hosing down with clean dry oil to remove dust/sludge on core and coil, including cleaning of oil tank to remove sludge deposit, replacement of rusted gasket set, burnt spindle, broken/unserviceable HT and LT ceramic bushing , broken arc horn surge arrester, replacement of silica gel for transformer of following capacity all as specified and directed by Engr-in-Charge.

50 KVA to 100 KVA

150 KVA to 200 KVA

250 KVA to 300 KVA

400 KVA to 500 KVA

Note for iteam No 42.00 to 45.00: (i) Cost of Transformer oil for cleaning by hosing down shall be deemed included in the rate quoted. (ii) Gasket set, LT/HT side ceramic bushing, spindle for HT/LT side and arc horn surge arrester for replacement shall be measured and paid under relevant item

Re-fixing of transformer core and windings by means of Crane/Chain Pulley without any damage to core/windings including re-filling/ topping up dehydrated new transformer oil after carrying out the maintenance/repair and making internal connection on LT/HT side and re-fixing of top lid cover, installing on mounting platform, making connections with HT/LT feeder and testing on load for transformer of following capacity all as specified and directed by Engr-in-Charge.

50 KVA to 100 KVA

150 KVA to 200 KVA

250 KVA to 300 KVA

400 KVA to 500 KVA

Note for item No 48.00 to 51.00 :- New transformer oil for topping up shall be measured and paid under relevant item. The dielectric strength of the same shall be tested by contractor before filling in transformer.

Rewinding of transformer of under mentioned capacities by super enameled copper wire as per existing guage of primary coil with `E’ class insulation, varnishing and heating the coil properly, fixing on core and making connection to achieve rated voltage and current of followings all as specified and directed by Engr-in-Charge.

50 KVA to 100 KVA

150 KVA to 250 KVA

Rewinding of transformer of under mentioned capacities by super enameled copper wire as per existing guage of secondary coil with `E’ class insulation, varnishing and heating the coil properly, fixing on core and making connection to achieve rated voltage and current of followings all as specified and directed by Engr-in-Charge:-

50 KVA to 100 KVA

150 KVA to 250 KVA

Supply only brass spindle for terminal on HT side threaded complete with nut, washers etc of suitable dia for transformer of following capacity all as specified and directed. :-

63 KVA to 100 KVA

150 KVA to 250 KVA

300 KVA to 500 KVA

All as per item No 59.00 here-in-before but for LT side of transformer of following capacity all as specified and directed.:-

50 KVA to 100KVA

150 KVA to 250 KVA

300 KVA to 500 KVA

Supply only ceramic bushing on LT side of transformer of following capacities all as specified and directed.

All as per item No 67.00 here-in-before but for HT side of transformer of following capacity all as specified and directed. :-

Supply only gasket set for transformer top lid cover, LT and HT terminal bushing suitable for transformer of following capacity all as specified and directed. :-

50 KVA to 100KVA

150 KVA to 200 KVA

250 KVA to 300 KVA

400KVA to 500 KVA

Supply and fixing Lightning arrestor suitable for HT12 KV Zinc Oxide valve element type (ZnO) 5 KA rms class E as per IS 3070 (PT.3 1993, IEC 99-4/1991 il with all fitting for outdoor use, Including Disconnecting and taking out existing unserviceable lightening arrestor complete .

Dehydration/filtration of transformer oil by means of centrifugal filtration plant to achieve the specified dielectric strength of 35 to 40 KV at 2 mm gap in existing possession of transformer of any capacity and transformer oil for topping up at various sub-station all as specified and directed by Engr-in-Charge.

Supply only transformer oil of approved quality having dielectric strength not less than 60 KVA, tested in 4.0mm gap, IS marked (Make: Savita/Poweroil) for filling in transformer for topping up all as specified and directed by Engr-in-Charge.

M&L for pin type grey polymer insulator in repair including one galvanised mild steel spindle, two galvanised iron washers and one galvanised iron nut suitable for 11000 Volts grade.

M&L for disc type grey polymer insulator in repair including one galvanised mild steel spindle, two galvanised iron washers and one galvanised iron nut suitable for 11000 Volts grade.

M&L for sand filling spreading, levelling in layers including watreing and consolidation complete all as specified and directed.

M&L and labour for spreading and levelling of unbroken river stone aggregate for loose filling of guage 40mm to 80mm graded complete all as specified and directed.

Supply & laying Electrical rubber mat 1mx2m of 11 KV grade (3.0 mm thick) made of highly electrical resistant elastomer complete all as specified and directed.

Supply & laying Electrical rubber mat 1mx2m of 33 KV grade (2.0 mm thick) made of highly electrical resistant elastomer complete all as specified and directed.

Note 1:- (Applicable for all parts/items) : The biidders/contractors are advised to read tender document, all drawings & all corrigendum/ amendments and general condition of contracts before entry/quoting the rates. Note 2:- Attention to bidder is hereby invited to upload revised BOQ if published during their bid submission. Uploading of incorrect/ pre-revised BOQ shall be treated as non bonafide and rejected.