Preventive and Break down maintenance of 400 220 132kV Switchyard equipments

Amount

Preventive and Breadown maintenance of 400/220kV, BTPS Switchyard equipment installed in 5X200MW, Obra.

Cleaning of pollution deposited on 400kV switchyard bay equipment.

Cleaning of pollution deposited on 220kV switchyard bay equipment.

Cleaning of pollution deposited on 400kV Generator bay including insulator string grouted on T.G. hall A-Axis wall.

Cleaning of pollution deposited on 400kV ICT/ Outgoing feeder bay.

Providing shunts/re-strengthening the 400/220KV damaged conductor segments.

Preventive maintenance of 400/220KV Current transformers (All three) and attending oil leakage.

Preventive maintenance of 220kV Sequential isolator without bearing overhauling.

Preventive maintenance of 400kV Sequential isolator without bearing overhauling.

Preventive maintenance of 400KV Sequential isolator including bearing O/H.

Preventive maintenance of 220KV Sequential isolator including bearing O/H.

Attending air leakages from 400kV ABCB.

Attending & filling of SF6 gas in 400kV SF6 breaker in emergency.

Attending of hydraulic oil leakage & filling of oil to maintain the oil level in proximity glass from 400kV SF6 breaker in emergency.

Attending of minor SF6 gas leakage and filling in 220kV SF6 breaker.

Replacement of 400kV CT/CVT in emergency.

Replacement of 400/220KV L.A. in emergency.

Write nomenclature element 400/220/132 sy at

Preventive and Breadown maintenance of 220/132kV, ATPS Switchyard equipment installed in ATPS, Obra.

Attending oil leakage and preventive maintenance of 200kV CTs and PTs.

Cleaning greasing and adjustment of isolator without O/H of bearings.

Overhauling of 220KV 3-phase isolator with top and bottom bearings.

Attending air leakage of 220KV/132Ky ABCB Russian circuit breaker.

Replacement of 220KV CT, including terminal cabling and connected works.

Repair & replacement of broken jumpers /conductor: Following works shall be carried out on 220KV Bus-I& II/Transfer /any 220KV elements any element conductor segment “consisting of 1No. ACSR, Dear conductor per phase" in ATPS, Switchyard for replacing 1No. Damaged conductor of per phase. Conductor length shall be as per site requirement which shall be provided by the Nigam

Attending Hot Spot points in Switchyard and Transformer yard ATPS, Obra.

Following works are to be carried out for removing the pollution deposits from the insulator discs and petticoats of 220KV Switchyard bays equipments to avoid the spurious tripping and consequential damages to the equipments work includes cleaning the pollution deposits from the petticoats of bay equipments by removing the layer of dust & dirt with the help of old cloth and then removing the pollution deposits with petrol & markin cloth followed by final cleaning with fresh markin cloth

Bay equipments located on auxiliary structure which are supported on ground.

220KV bus-1 & II transfer bus.

Supported insulator string dises/ buses

Preventive maintenance of 220/132kV Russian Circuit Breaker in ATPS, Switchyard (without opening main chamber of breaker).

Disconnection & Re-connection of Jumper From ABCB Breaker

Disconnection & Reconnection from SF, Breaker/ CTs/PTs.

Attending air-leakages/malfunctioning of block valve (disconnecting side & Re-arching chuate side) and associated NRV and air pipe line of the 220/132KVABCB Russian circuit breaker per phase.

Attending air-leakages/malfunctioning of operating (opening & closing)mechanism/drive of 220/132 KV ABCB Russian breaker

Tightening all nut bolt of poles in disconnecting and arching chuate side of 220/132kV Russian circuit breaker.

Preventive and Breakdown maintenance of 400KV SY compressors, heat less air driers, GT and S/Y Mulsifire compressors to keep the system trim & healthy round the clock basis including Sunday holidays & night hours.

Attending air leakages from cooler tubes of IR make type 15T-2 air compressors by replacing the faulty tube with new/repaired tube:

Attending problem of safety valve floating of various stages of 15T-2 compressors:

Attending mal-functioning of 60Kg/cm2 air pressure reducers and solenoid valves by replacing O-rings, gaskets & seals:

Attending problem of air leakage/passing from 60Kg/CM2 NRV by replacing faulty valves seals, spring etc.

Checking and attending air leakage from 400KV S/Y compressed air line stop valves, NRV etc.

Brazing, cutting and jointing the finned tube cooler nest for attending the air leakage,60Kg/cm2 finned tubes of stage-I,II,III of 15T-2 compressors are to be repaired:

Mounting of 60Kg/cm2 ball valve after removing the stop valves by way of gas cutting/brazing.

Brazing, cutting/jointing works on 30Kg/cm2 compressed air pipe line of 400KV S/Y.

Replacement of desiccant material & overhauling of heat less air drier.

Replacement of crank shaft of 15T-2 IR make compressors.

Preventive and Breakdown maintenance of 220/132kV ATPS switchyard air compressors, heatless air driers, other compressures to keep the system trim & healthy round the clock basis including Sunday Holiday & Night Hrs.

Routine maintenance of 03 Nos. Russian Compressors,06 Nos. IR compressors and 10 Nos. of ELGI make compressors. For this at least one experienced person must be deputed for at least hours (10:00 hrs to 18.00 hrs) Works may include following.

Breakdown maintenance of electrical and electronic control, annunciation and protection system of three nos. Russian compressors including the cost of consumables and spares required to attend the fault.

Breakdown maintenance of electrical and electronic control, annunciation and protection system of 06 nos. IR make & 08nos. ELGI make compressors including the cost of consumables and spares required to attend the fault.

Minor overhauling of IR make & ELGI make compressors.

Following works are to be carried out on compressors (01 Nos. Russian 06 Nos. IR make and 08 nos. ELGI make SF6, breaker total 17 Nos.) to keep the system healthy round the clock basis including Sunday, Holidays and night.

Attending air leakages from cooler tubes of compressors by replacing faulty tubes with new/repaired.

Attending fault of safety valves.

Attending mal-functioning of air pressure reducers and solenoid valves.

Attending fault Air leakage/ passing from NRV of all compressors.

Checking attending air leakages from Switchyard compressed air lines valve etc.

Brazing, cutting and jointing the finned tube cooler nest and all other air pipe lines for repairing & attending air leakages (Copper Line).

Brazing, cutting and jointing the finned tube cooler nest and all other air pipe lines for repairing & attending air leakages (GI Air Line).

Mini Overhauling of Russian compressor.

Attending the fault of stage valve pressurization.

Deen Dayal (BID ID -5249880)

M/S SHYAM ERECTORS (BID ID -5252014)