Attending day to day faults, repairing, maintenance of outdoor type transformer substations and Rewinding of 25/63 KVA, 11KV/0.415KV oil cooled Transformers with associated works at various Telephone Exchanges, Mobile BTSs, Admn Bldgs and Staff

Amount

Attending to break down calls, physical inspection of Substation accessories, overhead lines, feeder panels, meter box etc. to find out the faults and taking corrective measures for restoration of power supply including minor repairing works including replacement of insulators, LAs, jumpers, lugs/sockets etc. in coordination with supply authority etc. as required.

Liaison with different units of the supply authority i.e. Field units, MRT units, Division office etc. for obtaining shut down of 11KV line, breaking of meter seal if required to carry out the major repairing and maintenance works of the Transformer substation/ replacement/ rewinding and re-installation of the repaired Transformer, re-energisation, testing and re-commissioning etc. as required.

Thorough servicing of AB Switch, adjustment of bearings, male/female contacts, lubricating of moving items i/c replacement of minor defective parts like nuts, bolts, clamps, wire braided copper strips and checking the functional operation, etc. as required.

Replacement of the following defective spare parts of the transformer substation by new one i/c fitting, connection etc. as reqd. a) Rotor mechanism for 200 Amps air break switch.

b)11KV Post Insulator for 200Amps AB switch/ HG fuse unit

c) Operating Handle made of 25/32mm Medium class GI pipe with wire braided copper strip

d) Heavy duty operating pipe for air break switch including fabrication etc. as required.

Replacement of faulty/damaged pin insulators by new one of 11 KV grade pin type insulator with large steel head G.I. pin, nuts, washers on existing HT pole/ DP structure etc. complete as required.

Replacement of faulty/damaged disc insulators by new one of 11 KV, 45 KN porcelain disc insulator with galvanized insulator fittings, ball and socket type and complete with galvanized strain clamps, bolts, nuts, washers etc. as required.

Replacement of faulty Lightning arrestors by new ones of nonlinear resistor type lightning arrestor suitable for 3 wire, 11 KV overhead lines with rated voltage 9 KV (RMS) with a nominal discharge current rating of 5 KA and complete with galvanized clamping arrangement, G.I. bolts, nuts, washers etc. as required, comprising of 3nos per set.

Supply & drawing of 55 sqmm. AAA conductor for overhead line and DP structures i/c binding with insulators etc. complete as required.

Replacement of faulty/burnt out cables by new one of following sizes PVC insulated & PVC sheathed Aluminium conductor armoured cable 650/1100 V. grade confirming to IS : 7098 (Part-1) 1988 i/c transportation to respective sites etc. as required. a) 4 core 25 sqmm

b) Laying of one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 KV grade of following size Up to 35sqmm direct in ground including excavation and refilling the trench etc as required, but excluding sand cushioning and protective covering.

d) Laying of one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 KV grade of following size Up to 35sqmm in the existing Duct/Air as required.

e) Laying and fixing of one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 KV grade of following size Up to 35 sq. mm (clamped with 1mm thick saddle) on wall surface as required.

Replacement of faulty MCBs/SDFUs/Change over switches by new ones of following ratings after dismantling the old defective ones, fixing, connection & testing etc. as required. a) 63Amp 4-pole on load change over switch in sheet steel enclosure , front handle type (Make: HPL Socomec /Havells / L & T) .

b) 63Amps 415 volts 4 pole MCB (Class-C)

d) 63 Amp porcelain fuse unit with base & carrier.

Dismantling the following ratings faulty transformer from the existing D.P. structure/Plinth & installation of standby/repaired transformer i/c testing and commissioning, recording the required parameters etc. by qualified staff, arranging required tools & plant with proper precautionary measures etc. as required. a) 25 KVA, 11KV/0.415KV, 50 Hz Aluminium wound oil cooled Transformer

Repairing of 25 /63 KVA Aluminium/ copper wounded transformer at site i/c opening top cover, checking the bush, inter connections wires/strips from bushings to transformer windings, tightening the connections, etc. as required. (Rewinding of Transformer is not in the scope of this item)

Rewinding of the HT windings of the following ratings Oil immersed Distribution class Transformer with superior grade and suitable size Double paper covered Transformer winding conductor , providing re-insulation of LT winding etc. including dismantling the transformer parts i.e. conservator tank, terminal boxes, bushings, removing the core and windings from the tank, draining of transformer oil, cleaning of tank, reassembling the core & windings and all the aforesaid parts after rewinding/repairing, replacement of gaskets, worn out nuts, bolts and washers/cork washers etc, heating in heat chamber, carry out factory tests and submission of test reports etc. complete as required. (The dismantled aluminium winding and other materials can be retained by the agency and credit for the same to be given in the quoted rate of this item) a) 25 KVA, 11KV/0.415KV, 50 Hz Aluminium wound oil cooled Transformer

Supplying and pouring of transformer oil (IS:325) of suitable make & grade for topping up/replacement of old deteriorated oil etc. complete as required.

Filtration and de-hydration of existing Transformer oil at factory / work shop ( In case of rewinding/repairing of Transformer at factory / workshop), testing of BDV and submission of oil testing report etc. as required.

Transportation of spare/new/repaired/standby 25/63 KVA transformer from BSNL office /factory /workshop to respective sites and faulty Transformer from sites to back by using suitable transportation medium including loading and unloading at both ends etc. complete as required. (The rate should be inclusive of toll gate fee/charges wherever applicable, nothing extra will be paid. Distance will be on shortest route only). a) Distance up to and including 50 KMs (Up and Down)

b) Distance above 50 KM and up to and including 150 KMs (Up and Down)