PROVN OF TRANSFORMER AND CONNECTED ITEMS AT MAMUN MIL STN

Disconnecting electrically , dismantling and taking down transformer of capacity 100 KVA to 630 KVA and shifting carefully to MES store yard, complete all as specified and as directed.

Supply, installation, commissioning and testing of transformer step down, outdoor type, copper wound, oil cooled , 11/0.433 KV (at no load) with HT 3 phase and LT 3 phase 4 wires, AC ,50 Hz of capacity 100 KVA with off load tap changing in 7 Nos positions arrangement on HT side for a variation of secondary voltage +5% to -10% in steps of 2.5% "BIS marked & BEE star labelled", when measured by the resistance method after continuous full load run in ambient temperature 48 degree centigrade. Including suitable cable entry box on LT side and HT bushing on primary side complete in all respect with standard accessories and fittings confirming to IS 1180 2014.The transformer shall be complete with standard fittings complete all as specified and as directed als latest design (Level II) for transformer comprising of following :- (i) One cable box on HV side(Primary side) consisting 3 Nos porcelain bushing rods complete with nut, washers, cable, gland etc., (ii) One cable box on LV side(Secondary side) consisting 4 Nos porcelain bushing rods complete with nut, washers, cable, gland etc., (iii) Oil conservator tank with filter type drain valve and oil level gauge., (iv) De-hydration breather with first fill of de-hydrating agent(silica gel)., (v) Explosive vent, (vi) Thermometer pocket on tank cover, (vii) Dial type thermometer, vapour pressure type having range 0 to 120ºC with metal guard having maximum perimeter reading temperature indicaton with resetting device for transformer, (viii) Rating plate with terminal marking plate, (ix) Earthing terminal on tank and cover for fixing earth strip of size 32 x 6mm., (x) Oil level guage and Oil drain filter valve., (xi) Lifting lugs, (xii) Oil filling holes with cap/plug with connecting plate complete., (xiii) Air release valve plug, (xiv) Extra bushing for Neutral out side the cable box for independent earthing for neutral earth., (xv) First filling of fresh transformer oil confirming to relevant IS and tested up to 45 KV die electric strength. Note: Test certificate, purchase voucher of transformer and test certification of electric strength shall be submitted by the contractor after filling the oil from manufacturer.

Ditto all as per item No-2 here in above but transformer of capacity 160 KVA, complete all as specified and as directed.

Ditto all as per item No-2 here in above but transformer of capacity 200 KVA, complete all as specified and as directed.

Ditto all as per item No-2 here in above but transformer of capacity 250 KVA, complete all as specified and as directed.

Ditto all as per item No-2 here in above but transformer of capacity 315 KVA, complete all as specified and as directed.

Ditto all as per item No-2 here in above but transformer of capacity 400 KVA, complete all as specified and as directed.

Ditto all as per item No-2 here in above but transformer of capacity 630 KVA, complete all as specified and as directed.

Disconnecting electrically , dismantling and taking down VCB panels of capacity up to 630 Amps and shifting to MES store yard, complete all as specified and as directed.

Supply, installting, Commissioning & testing HT 11 KV, 3 Phase 50 Hz , rupturing capacity 250 MVA indoor type, VCB PANEL suitable as incomer totally metal clad withdrawable type Vacuum Circuit Breaker, including cable connection with Copper busbar of suitable rating. horizontal isolation horizontal drawout type VCB of capacity minimum 400 Amps rated current, . The switchgear panel shall be made up of CRCA sheet steel duly powder coated or equivalant not less than 2.5mm thick for load bearing section and not less than 2 mm thickness for non-load bearing and shall be totally dust and vermin proof. The complete panel incl HT and LT chamber with colour coding wiring shall be manufactured by approved OEM at its own facility. The VCB shall consist of following :- (i) Continious current rating minimum-400A. (ii) Short circuit withstand current minimum 25 KA for 1 Sec. (iii) Operating Mechanism of the VCB are suitable for 10000 Mechanical Operations (iv) 3 x CT with ratio not less than 200-100/5-5, core 1: Class 1 ,15 VA Core 2: 5P10. 15VA burden (v) Cast resin drawout type potential transformer 11 KV/V3/110V/V3/110V/3, 100 VA , CI 0.5 (vi) Protection arrangements for the breaker shall comprise of the following:- (a) Each of the incomer switchgear units shall be provided with over current (50/51) and earth fault (50N/51N) protection, this relay shall also provide over voltage (59), under voltage (27),. The over voltage element shall have setting of 100 to 200% in steps of 1% and under voltage element shall have setting of 30 to 90% in steps of 1%. The main protection relays should be SCADA compatible with IEC 61850 Edition 2 on 2 nos. FO ports. Relay should generate GOOSE message as per IEC 61850 standard for interlocking and also ensure interoperability with third party relays. (b) PT and Master Trip Relay (c)TCS Relay (vii) The following meters, indications and acessories are to be provided with the panel. (a) Digital Volt Meter/Ammeter with built in selector switch (b) Necessary DC Supply with powerpack, healthy indication lamp & switch. (c) Multi-function meter. (d) Control:- (d1) TNC (Trip, Neutral & Close) breaker control switch with indicating arrangement. (d2) Local/remote selector switch for breaker open/close operations.