REPLACEMENT OF OCB 6 KV TO VCB 6 KV AT METROLOGY SUB STATION AT SQAE (A) COSSIPORE UNDER GE I P FY ISHAPORE

Amount

Taking down and removing existing OCB 6 KV after disconneting the incoming/outgoing connections, earthings and removal of grounting bolts embedded in concrete foundation and depositing to MES storeyard complete all as specified and as directed.

Supply, installation, testing and commissioning of vacuum circuit breaker (VCB) comprising of the under-mentioned accessories/parts including necessary civil work as specified and directed by Engineer-in-Charge. Detail description as under:-

VCB DETAILS 6.6 KV, 400 A, 18.4 KA, drawn out type VCB with motorised spring charge mechanism suitable for 240 VAC, with closing & tripping coils for 110 V DC Make - Schneider PANEL, BUSBAR, CURRENT TRANSFORMER & POTENTIAL TRANSFORMER DETAILS (i) Fully compartmentalised sheet steel totally enclosed floor mounted with safety shutters, horizontal drawout & mounted with safety shutters, horizontal isolation, alongwith insulated PVC sleeve for (630 A Cu, BUS BAR), foundation bolts etc., with provision for terminating PILC/XLPE cable

(ii) Resin cast, dual core CTs having CT ratio 100-50/5+5A with core 1:15 VA, CL-1, core 2:15 VA, CL:5P10 Make - Schneider (iii) 1-PH PT-6.6 KV/RT3/110V/RT3, 100VA CL-1, 100 VA, 3P with fuses for primary and secondary circuit and OVF; 1.2 cont and 1.9 times for 8 hours Make - Schneider BREAKER PANEL INDICATION LAMP (i) On/Off/Trip/Spring Charge/TC healthy/Test/Service (ii) R-PHASE, Y-PHASE, B-PHASE indicating lamp (iii) Heater switch (iv) Thermostat SWITCHES AND OTHER ACCESSORIES (i) AC on/off switch. (ii) DC on/off switch.

METER (i) 3 -Phase digital ammeter, Cl- 1.0, (ii) 3 -Phase digital voltmeter, Cl - 1.0 (iii) Digital multifunction meter with- A, V, KW, KWH, PF, Hz, Cl-1.0 RELAY (i) Numerical feeder protection realy MICOM P111-L, (ii) Master trip relay, AVAJH13, (iii) Auxillary relay, AVA33

M&L for Cable jointing kit for 11 KV (Earthed) grade cable for indoor termination cold shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 120 sq mm

Materials and labour for earthing complete with copper earth plate electrode 600 mm x 600 mm x 3mm thick, burried directly and preferably vertically in ground, earth pit not less than 2.25 Mtr deep below ground level with top edge of the plate not less than 1.5 m below ground level connetced with 20 x 3mm copper strip by means of nuts, bolts, check nuts and washers made of copper strip to be protected by galvanised iron pipe 25 mm bore (light grade) and other end connected to earthing test point or lightening arrestor or main controlling switch as directed including providing funnel with 20mm bore galvanised iron pipe (medium grade), wire mesh, charcoal or coke and common salt in alternate layer of 15cm (compacted thickness) all round the earth electrode, concrete earth pit in PCC (1:3:6) type C-1 (with 20mm graded aggregate), 50mm thick precast RCC (1:2:4) cover slab (re-inforced with 8mm dia TMT bar @ 15 cm C/C bothways and suitable handle made of 10mm dia) including necessary earth work in excavation, returning filling and removal of surplus earth upto a distance not exceeding 50 m etc all as shown on electrical plate No. 3 of MES Schedule Part-I(2009) including testing complete all as specified and as directed. Note: Earth strip upto 7.5m shall be deemed to be included in the quoted rate of the item.

Material and labour for copper earthing strip 20 x 3 mm buried in ground for earthing all as specified.

Supplied and fixed Tubes, 'light grade',galvanised,with all fitting;laid in trenches for bore dia of pipe 25mm to be used as protection to copper earth strip all as specified.

M/s Anil Kumar Dutta