SPECIAL REPAIR TO 33/ 11 KV, 1.6 MVA TRANSFORMER AT 33 KV MRS, SI LINES UNDER GE BHOPAL

Amount

Disconnecting, taking down power transformer (Make: Kirloskar, Manufacture’s Srl No. - O5PNG014, MES No.-172/3246/TR-08, located at 33 kV MRS at SI Lines), outdoor type 33 kV /11 kV having capacity 1.6 mVA, transportation to the workshop for repairs including opening of transformers cover, draining of oil, de-tanking of core and coil assembly, cleaning, washing of dust and dirt from all parts including core, tank and cooling tubes radiators etc., joint inspection for estimate, painting to inside surfaces of tank using bright yellow heat resistant and oil resistant paint in two coats, replacement of defective parts, assembly, stage inspection, re-tanking, oil filtration, fill fresh oil and testing the repaired transformers for all the routine tests as per IS 2026 (Part 1): 2011 with latest amendments and other tests as mentioned. Note: - (a) Transformer oil shall be drained out by the contractor in suitable capacity mild steel drums to be arranged by the contractor. (b) Rewinding of both HT & LT coil shall be measured and paid for separately under respective item of this schedule. (c) Transportation charges for transportation of transformer from site to workshop and after repair, workshop to site shall be borne by the contractor and cost thereof shall be deemed to be included in the unit rate quoted for this item. (d) Painting to inside surfaces of tank shall be done after shot blast cleaning and using bright yellow heat resistant and oil resistant paint in two coats (minimum thickness 30µm) and paint shall neither react nor dissolve in hot transformer insulating oil. The cost of painting shall be deemed to be included in unit rate quoted against this item. (e) The spare parts excluding nuts, bolts, washer, gasket etc. shall be measured and paid for separately (f) Reassembling of all parts shall be included in unit rate quoted against this items. (g) The said transformer shall be repaired in reputed workshop as decided by the GE. (h) Testing of transformer after repair shall be carried out as per IS 2026 (Part 1): 2011 along with high voltage test, Buchholz relay tripping test, operational measurement on OLTC’S and testing as specified and the testing shall be done in the presence of the rep of the Accepting officers at the workshop. and the cost of testing shall be deemed to be included in unit rate quoted against this item. (i) The IR value of the dried winding before inserting the core in the shell shall be measured and recorded.

M & L for rewinding of coils on primary/ secondary side of transformer of any capacity using proper size, muitiple(triple) paper covering, special (S) copper winding wires conforming to IS 7404 (Part-1): 1991 as per existing size, turns and insulation class including connecting minor insulation materials suitable for 33 kV/ 11 kV transformer complete all as specified and as directed. (Note: - Weight of only winding wire shall measured for payment purpose.)

Supply and fill unused mineral insulating oils conforming to IS 335: 2018, Type II Class (Transformer oils), Uninhibited (U), pour point -10⁰C, vacuum filtered in a laboratory, Breakdown voltage of min 70 kV at 2.5 mm gap complete all as specified and as directed.

S & F silica gel breather containing 1000 gms silica gel, indicating type, 4 to 6 mm standard size of the particle, blue colour silica, breather body made out of aluminium pressure die cast, shot blasted and powder coated, container and oil cup made out of 143R grade UV resistant polycarbonate, all gaskets made out of nitrile cork (RC 70C) rubber, flanged type. breather piping doesn’t include any valve between conservator and breather, removable type mounted at suitable height from ground level, tested for 0.35 kg / cm for all joints complete all as specified and as directed.

S & F 36 kV/ 250 A bushing with copper stem including both porcelain parts and metal parts with accessories as per IS 3347 Part 5 (section 1 & 2) complete all as specified and as directed.

S & F 12 kV or 17.5 kV/ 250 A bushing with copper stem including both porcelain parts and metal parts with accessories as per IS 3347 Part 3 (section 1 & 2) complete all as specified and as directed.

PRADEEP SISODIYA