SPECIAL REPAIR/REPLACEMENT OF BER POWER AND DISTRIBUTION TRANSFORMERS ASSOCIATED WITH EXTERNAL ELECTRIC SUPPLY UNDER GE NAGROTA

Supply, install, testing, & commissioning outdoor type Power transformer having no load voltage ratio at rated voltage 33/11 KV, 6.3 MVA oil immersed, naturally cooled 3 phase 50 Hz, vector group DYN-11 and ON Load tap Changer(OLTC) (Tapping Range +5% to -15% in step of 2.5% with remote tap cubical changer (RTCC) Panel & Automatic Voltage Regulator (AVR) with vector group Dyn-11 tap changing switch (9 position), on HT side to very secondary voltage, connected internally and hand operated ON Load tap changing switch, star Delta connected internally with HV coil, copper double wound, LV side provided with 3 phase and neutral with the temperature rise not exceeding 50 degree C by thermometer in oil and 55 degree Celsius by resistance with first filling of oil as per IS grade 335 and transformer conforming to IS 2026 "class A" all as directed and specified. The Manufacturer must have ISO Certificates. Paint should be PU. Painting process should be done in environment friendly painting booth with heaters for curing of paint. The following fittings and accessories including first fill of transformer oil necessary mounting on PCC floor mounted as per manufacturer's recommendations and specifications; (a) Lifting lugs, Top cover lugs & jacking Pad. (b) Earthing Terminals. (c ) Conservator with oil gauge Glass, Oil filling hole with plug and drain plug. (d) Transformer Drain valve (e) 04 Nos Bi-directional plain/Flat rollers (f) Explosion Vent with Diaphragm (g) Thermometer Pocket (h) Air Vent Plug (j) First Fill Silica get Breather (k) Rating & Diagram Plate, Inspection cover,. Terminal Making Plate (l) Cooling Radiators m) HT Termination - Bare Bushing. n) Provn of LT Termination box for connecting LT output through rated cables etc. as catered in CCE work provisions complete all as drawings approved by GE. (m) LV Neutral Bushing brought out for external earthing. (n) First Fill of EHV grade Transformer Oil (o) Buchholz Relay with Contracts for Alarm & Trip Contacts (p) Magnetic Oil Level Gauge with Alarm Contacts (q) Oil Temp indicator with Alarm & Trip Contacts (r) Winding Temperature indicator with Alarm & Trip Contacts (s) Marshaling Box (t) No load losses - 7.5 kw + IS Tol. (u) Full load losses- 43.0 kw + IS Tol. (v) Impedance – 7.15% + IS Tol. (w) Pressure Relief Valve with Alarm & Trip Contacts

Supply, installation, Testing, Commissioning of Oil Cooled, Copper wound, Step down "BIS marked & BEE star labelled " transformer of capacity 315 KVA plinth mounted outdoor type with latest feature complete with standard fitted HT 11 KV 3 phase, LT 433 V 3, phase 4 wire,50 C/S oil immerse, naturally cooled externally cooling tube delta connection on primary HT 11 KV side and star connection on secondary LT 433V with tapping at +/-2.5 %to +/-5 % & +/- 7.5 % on HV side and to be changed by means of hand operated off load tap changing gear including first filling of new transformer oil of dilectric strength not less than 55 KV with all fitting and accessories such as LT box with cable gland, HT box with cable gland, Silica gel, breather, Oil level indicator gauge, drain out valve (oil tank),exhaust vent, air release valve, temp gauge, cast iron wheel etc comply with EEL 2 IS 1180 2014 with amendment 1,2,3 & 4 having total losses @ 50% load 955W & total losses @ 100% load 2750W. Following items/ Accessories included in this rate therefore No any extra cost will be paid for this items complete all as specified and directed by Engineer-in-charge. (i) Name, rating & diagram plate (ii) 7 positions Off circuit tap changing switch (iii) Earthling terminals (iv) Lifting lugs (v Oil drain valve with plug (vi) Oil filter valve with plug (vii) Conservator with oil filling hole (viii) Thermometer pocket (ix) Air release plug (x) Silicagel breather (xi) Removable inspection opening (xii) Explosion vent (xiii) Transformer platform as per manufacturer design with chain link fencing of size as approved by GE along all the sides of platform supported by providing angle iron of size 50 x 50 x 6mm at all corners including supplying and fixing danger notice plate on all the sides of chain link fencing and painting the fencing and angle iron with black synthetic enamelled paint.

M&L for earthing complete with galvanized mild steel earth plate electrode of size 60cm x 60cm x 6mm thick buried directly in ground preferably in vertical position (earth pit not less than 2.25 meters below ground level) with top edge of earth plate not less than 1.5 meters below ground level, connected to galvanized iron strip 25 x 4mm by means of nuts, bolts, check nuts and washers of GI or steel including PCC (1:2:4) type B-1, precast RCC cover slab of size 550 x 550 x 75mm, XPM reinforced not less than 1.60 Kg/Sqm with suitable built in handle made from 12mm dia MS round bar, excavation and earth work in any type of soil, 20mm dia bore medium grade galvanised iron water tubing fixed with cast iron funnel and wire mesh at one end, 15mm bore light grade galvanised iron protection pipe for earth strip protection upto 5m length, charcoal, common salt complete all as shown in electrical plate No 3 of MES SSR 2009 Part-I, connected to equipment and testing on completion for desired result complete all as specified and directed by Engr-in-charge.