CWE/CHM(U)-82/2024-25 SPECIAL REPAIR FOR REPLACEMENT OF 02 X STEP DOWN TRANSFORMER AGAINST BER AT COMMAND HOSPITAL (WC) UNDER GE (U) CHANDIMANDIR AT CHANDIMANDIR MIL STATION

Amount

Taking out unserviceable/ BER Transformer, 1600 KVA after disconnecting all incoming and outgoing electric connections and deposit to AGE E/M (U) CH store complete all as specified and as directed by Engineer-in-Charge.

Supply, installation, testing and commissioning of 1600 KVA, oil cooled, indoor transformer, floor mounted, 11KV on HT side and 433 volts on LT side with On load tap changer +RTCC +AVR on HV winding for HV variation from +5% to -15% in steps of 1.25% each (16 steps and 17 positions), step down 3 phase, 50 Hz AC, copper wound, two winding, core type transformer, conforming IS : 1180-2014 (latest) and oil shall confirm to IS : 335-1983, oil immersed, oil natural air natural (ONAN) type of cooling, with external cooling tubes. The temp rise shall not exceed 55 degeree centigrade in winding and 45 degree centigrade in oil when measured by the resistance method after continous full load run and on ambient temp of 48 degree centigrade, losses shall be as per IS-1180 Part I 2022 level 2 complete all as specified and as directed by Engineer-in-Charge.

The transformer shall be complete with the following fittings:- (a) HV Bushing and cable box of suitable size on High Voltage Side. (b) LV glands and bustranking connection of suitable size. (c) Oil conservator with oil filling hole with cap and drain plug. (d) Dehydrating breather with first fill of dehydrating agent. (Silica gel) (e) Thermometer pocket with thermometer dial of suitable size. (f) Two Earthing terminals on tank and take cover with lugs to suit 32x6 mm GI strip. (g) Rating and diagram Plate - aluminum (h) Terminal marking plate. (i) Oil level indicator. (j) Oil drain and filter valve. (k) Lifting lugs (l) Bi-Directional rollers. (m) Oil filter plug with connection complete.

(n) Extra bushing for neutral outside the cable box for providing independent earthing. (o) Oil filling hole with cap. (p) First filling of oil. (q) Cable box on LV side with cable gland. (r) Air release plug. (s) Radiators with lifting lugs. (t) Explosion vent with Diaphragm. (u) Epoxy paint (v) Jacking Pads. (w) Onload Tap Changer. (x) Remote Tap Changer Cubicle (RTCC). (y) Automatic Voltage Regulation Relay (AVR).

The transformer will have the following accessories:- (a) Buchholz Relay with Alarm & Trip. (b) Oil Temperature Indicator with Alarm & Trip Contact (2A). (c) Winding Temperature Indicator with Alarm & Trip Contact (2A) (d) Marshalling Box. (e) Oil Surge Relay

Note: (i) Drawing of transformer must get approved from GE before placing order. (ii) Pre-commissioning of transformer shall be carried out by SEI within overall cost quoted. (iii) Necessary T&P required for testing shall be provided by contrctor.

M&L for earthing complete with copper earth plate electrode 60cm x 60cm x 3.15 mm thick buried directly in ground (earth pit not less than 2.25 meters deep below ground level) with top edge of the plate not less than 1.5 meters below normal ground level connecting to copper strip 20 x 3 mm as earthing lead by means of bolts, nuts, check nuts and washers of galvanized iron or steel and earth wire protected by 50 mm dia GI pipe medium grade earth plate surrounded by alternate layer of coal dust and common salt 15 cm thick each layer all as per electrical plate and connected to pole structure/ panel board/ earthing test point all as shown in electrical plate No. 3 of SSR Part-I (2009) and testing on completion complete all as specified and as directed by Engineer-in-Charge.

Note:- The unit rate quoted shall also include for excavation, earth work in any type of soil, cost of construction of earthing pit as shown in electrical plate no 3 with PCC 1:3:6 mix, Type C-1, cover slab of 40 mm thick RCC 1:2:4, type B-1, reinforced with 8 mm dia TMT bars @ 150mm C/C both ways, GI funnel with watering pipe, wire mesh, protection pipe, earth strip up to 7.50m long.

Supply and laying copper strip 20 mm X 3 mm thick as earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/ pipe or fixed to poles or any other indicated situation for loop earthing etc. complete all as specified and directed by Engineer-in-Charge.

M&L for contruction of platform for transformer of size 3000 mm x 2500 mm x 500 mm with brick masonary in cement mortar 1:4, over 150 mm thick PCC 1:4:8 type D-2 in foundation and 40 mm thick PCC 1:2:4 type B-1, as sub base and brick masonry step on one side having 75 mm thick riser upto the level of transformer plateform, 15 mm thick plastering to brick masonary in cement mortar 1:4 and including two coats of white wash on plastered surface including excavation and earth work in any type of soil complete all as specified and as directed by Engineer-in-Charge.

Supplying, laying, jointing and testing of HT Power Cables, Aluminum Stranded Conductor, 95 sqmm, 3 core, XLPE Insulated, PVC Inner sheathed, Armoured with galvanized wire or galvanized steel strip, overall PVC Sheathed, 11 KV Grade as per IS 7098 (Part I) 1988 complete including provn of lugs, glands, nuts, bolts & washers etc and testing on completion complete all as specified and as directed by Engineer-in-Charge.

S&F Heat Shrinkable Cable joint kit for 11 KV HT (earthed) grade cable for Indoor end termination type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 Sqmm complete all as specified and as directed by Engineer-in-Charge.

R D Bansal (BID ID -3176305)

Roy and Sons Infrastructures (BID ID -3176338)

SHARMA ELECTRICAL ENGINEERS (BID ID -3176317)

Leo Network power systems (BID ID -3176175)

SAINI AND SAINI BUILDERS (BID ID -3176324)

JAY BEE Industries (BID ID -3171674)

MAHESH KUMAR SINGLA CONTRACTOR (BID ID -3176168)

Chankaya Solutions (BID ID -3176449)

Electromech Engineers (BID ID -3175691)

Shiv Enterprises (BID ID -3176325)