REPAIR OR MAINTENANCE OF HT SWITCH GEARS, VCBS, TRANSFORMERS, HT POLES, HT UG CABLES AND ALLIED HIGH TENSION ELECTRICAL WORKS AT MILITARY STATION KANCHRAPARA UNDER GE BARRACKPORE

Replacing of spare parts under this contract shall be carried out through BOO conveyed by Accepting Officer. The contractor shall undertake replacement of sparte parts only as the reccommendation/ approval conveyed by the Accepting Officer through the BOO.

Repair/maintenance and servicing of step down transformer 11 KV/433 Volt of capacity upto 630 KVA , comprising following work services :- (a) Disconnection carefully of cable end termination of HT & LT side. (b) Opening of top cover by removing nuts, bolts and all mounting accessories and conservator tanks. (c) Draining out transformer oil and keeping aside in barrel for re-use and then again pouring back after necessary filteration and dehydration including top up with new transformer oil to make up the reduced quantity if required (New Transformer oil for topping up will be measured and paid separately). (d) Replacement of top and buttom Gaskets. (e) Servicing of tap changing gears by cleaning and polishing tapping contact points. (f) Cleaning of bush and stud both HT/LT side and refixing the same with new cock sheet as required (h) Reconnection of all cable terminals HV & LV sides and refixing the top cover after replacement of gaskets, conservator tank in position. (j) Cleaning and heating of silica gel in breather and replacing with new silica gel if required.. (k) Connecting HT & LT side with existing incoming and outgoing cables including reconnection of earth strip/lead. Note: (i) Filteration and dehydration of transformer oil, New transformer oil and spares like bushes and studs,New silica gel,New buchholz relay and M seal monoplast, etc required for replacement shall be measured and paid separately. The labour element involved in replacing the spares shall be deemed to include in the unit rate quoted. (ii) The unit rate quoted shall include the cost of all other minor spares as required not mentioned hereinafter.

Supply and Fix bushing and stud complete with porcelain insulators for LT side (as per existing size/Model) for transformer of capacity upto 500 KVA complete all as per manufacturer instruction.

Supply and fix bushing and stud complete with porcelain insulator for HT side (as per existng size/Model) for transformer of capacity upto 500 KVA complete all as per manufacturer instruction.

Supply only transformer oil (ISI marked) in sealed containers for transformers oil, confirming to IS-335 with dielectric strength of not less than 60 KV at 2.5 mm gap and testing for strength including recording results complete all as specified. Note:- (i) Purchase vouchers alongwith manufacturer's test certificate shall be produced to GE. (ii) Nos of sealed containers shall be recorded in MB.

Supply and fixing silica gel for breather as per existing specification in sealed bag for transformer up to 650 KVA capacity complete all as specified and directed.

M & L for preparation of old painted steel or iron surfaces of transformer of any capacity by scrapping with steel wire brush/scrapper emery paper, etc. and applying two coats of synthetic enamel smoke grey paint over a coat of red oxide primer (painting shall be done by spray machine) including writing of SM No, MES No etc. at prominent place/location of transformer capacity 100KVA to 630KVA with black synthetic enamel paint in white back ground complete all as specified and directed.

Supply & fixing gang operated air breaker switch ,triple pole, mechanically operated , mounted on insulators and steel frame with operating mechanism worked from ground level using heavy duty GI pipe, for current rating 200 amps, out door type (confirming to IS specifications) HT 11 KV , triple pole with fixed contacts of phosphorous and bronze fuse carrier fitting , 9 insulator type mounted on MS channel operating rod with pad lock arrangement including dismantling old unserviceable gang operated Air breaker switch from two pole / four pole structure complete all as specified and directed. Note: Rates quoted deemed to be inclusive of all equipment such as crane & transported vehicle .(Set of three)

M & L for complete servicing, calliberation and testing of 11 KV Vacuum Circuit Breakeer (VCB) as per the following scope of the work :- (a) Complete servicing to be carried out as per the manufacturer guidelines. (b) Removal of corroded grease and foreign particles from various parts of the VCB. (c) Cleaning of all parts with cleaning agents such (d) Checking the setting/alignment of pole assembly and contact impression. (e) Checking the arching contacts gap and same to be adjusted or replaced with new contacts if any. (f) Checking the release setting as UVR/Shunt trip/Earth fault protection release. (g) Checking the tightness of all hardwares if any and also presence of hardware and provide the same if not available. (h) Checking operating mechanism and trip mechanism function. (j) Re-greasing and lubrication of complete VCB. (k) Testing of protection release with necessary testing kit. (l) Re-fixing the VCB and service report to be issued.

Taking out old UNSV existing relay of any type from the HT VCB panels, M&L for supply, fixing, fabrication, testing and commissioning of Over current and Earth fault relay suitable for 11 KV VCB of 630 to 800 Amps, intelligent measuring and protection device offrs a compact multifunctional protection for feeder and transformer segment having the following features :- (i) 1A & 5A rated CT input (site selectable) (ii) Three phase time over current protection (iii) Draw out with self CT shorting. (iv) Three phase instantaneous protection (v) Earth time over current and earth instantaneous over current (vi) Circuit breaker failure detection (vii) Trip circuit supervision (viii) Event recorder (ix) Fault recorder (x) Trip counter (xi) 5 push buttons on the front for MMI (xii) RS-485 & USB communication (xiii) Harmonic blocking (xiv) Trip circuit supervision (xv)Circuit breaker failure protection (xvi) Earth time over current (51N). ( Make- Schneider Electric/L&T/ABB)