Construction of 100 bedded Critical Care Block (CCB) at Howrah District Hospital, Howrah - External Electrical Installation Work. (Sub-station and Compound Light).

Supply, Installation, testing & Commissioning of 6 KV 800 A, short-circuit capacity of 26.3 KA for 1 sec, 3-panel HT Gear with VCBs. The Vacuum Circuit Breaker should comply as per IS:13118& IEC:62271-100 for Circuit Breaker & IS:3427 & IEC:62271-200/IEC 694, IEC-61850 for Indoor panel. The HT panel is rated at 6 KV, 3-Phase 800A, Breaking Current/short-circuit capacity of 26.3kA for 1 sec, 50c/s and shall be of floor-mounting, sheet steel clad, free-standing metal enclosed air insulated switchgear cubicle with VCB inside. The Vacuum Circuit Breaker is horizontal isolation & horizontal draw out/Vertical isolation & horizontal draw out with 3 compartments and is made of 2mm CRCA sheet for load bearing members with vermin & moisture proof along with automatic shutter arrangement for complete isolation of bars, cable sockets & other live parts etc. when the removable portion is withdrawn. The breaker is arranged for hand operation through front of the panel push buttons & spring charging mechanism and also electrical motor which will be energized by 230V AC. Closing and tripping coils are rated for 110V DC to be made available from the station 400 V 3 phase 50 C/s A.C. source with remote operation compatibility. All trip coils shall be of shunt trip type energized from a suitable rectifier condenser source supply is required. There is a remote operation through multi core arrangement for closing & tripping. The shutter shall be gravity operated.

INCOMING CIRCUITBREAKER

a) 3 Phase Star- Star 3 limb draw type line PT 6KV/√3 /110V/√3 , 100VA Cl - 1 with fuses for primary & secondary circuit - 1 no. b) Epoxy Cast, Dual Core Delta/Y-Y CT having CT ratio 300/150/5+5 ,with CORE1:15VA Class-1.0 CORE2 -:15VA, Class-5P10, STC - 26.3ka for 1 sec- 3 nos. c) Shunt Trip Coil of 110V DC- 1 no. d) LED type indicating lamp for VCB ON/OFF, CB Trip, Springe Charge, Trip Ckt Healthy- 5 nos. e) LED type RYB Phase indication lamps-- 1 set f) Cubicle Panel illumination lamp.- 1 set g) Push Button for Emergency Trip- 1 no. h) Digital Voltmeter with Selector switch- 1 no. i) Digital Ammeter with Selector switch--- 1 no. j) Digital Multi-Function Meter- 1 no. k) Combined Numerical Relay of SCADA-compatibility incl. providing necessary software with following protection function:-50, 50N, 51, 51N, 37, 46, 46BC, 49, 50BF, 64N,68,86& 95 with programmable in-built LED indicating lamp --- 1 set. (Siemens/ ABB/ Crompton Greaves/ L&T/Alstom) l) Master Trip Relay - 1 no.(Make -Siemens/ABB/ Crompton Greaves/L&T/Alstom) m) Trip circuit Supervision relay - 1 no. (Make-Siemens/ABB/ Crompton Greaves/L&T/Alstom) n) Anti pumping relay-- 1 no. o) 6/8 Window Annunciator -- 1 set p) Local Remote/T-N-C/Motor On-Off/Heater On-Off Switch- 4 set. q) MCB for control supply-AC/DC -- 2 sets r) HRC control fuse & link as per scheme-- 1 set s) 110V DC Hooter- 1 no. t) Power Pack with 220V AC input & 110V DC continuous output should be capable of taking O-C-O operation with its battery backup. Charging unit for system, complete with suitable inter-connection with 2.5 sq.mm FRLS insulated copper conductor cable etc. as required -1 set u) Panel space heater with thermostat-- 1 no. v) Panel Illumination lamp.

OUTGOING CIRCUITBREAKER

a) Epoxy Cast, Dual Core Delta/Y-Y CT having CT ratio 200-100/5+5A , with CORE1:15VA Class-1.0 CORE2 -:15VA, Class- 5P10. The CT should have at least 25% over capacity than total connected load. STC - 26.3 ka for 1 sec- 3 nos. b) Shunt Trip Coil of 110V DC- 1 no. c) LED type indicating lamp for VCB ON/OFF, CB Trip, Springe Charge, Trip Ckt Healthy- 5 nos. d) LED type RYB Phase indication lamps-- 1 set e) Cubicle Panel illumination lamp.- 1 set f) Push Button for Emergency Trip- 1 no. g) Digital Voltmeter with Selector switch- 1 no. h) Digital Ammeter with Selector switch--- 1 no. i) Digital Multi-Function Meter- 1 no. j) Combined Numerical Relay of SCADA-compatibility incl. providing necessary software with following protection function:-50, 50N, 51, 51N, 37, 46, 46BC, 49, 50BF, 64N,68,86& 95 with programmable in-built LED indicating lamp --- 1 set. l) Master Trip Relay - 1 no. m) Trip circuit Supervision relay - 1 no. n) Anti pumping relay-- 1 no. o) 6/8 Window Annunciator -- 1 set p) Local Remote/T-N-C/Motor On-Off/Heater On-Off Switch- 4 set. q) MCB for control supply-AC/DC -- 2 sets r) HRC control fuse & link as per scheme-- 1 set s) 110V DC Hooter- 1 no. t) Panel space heater with thermostat-- 1 no. u) Panel Illumination lamp.

BUSBAR

The spacious bus bar compartment is provided on the top of the cubicle. The main bus bar can carry current up to 1000A and are made of electrolytic grade copper & shall be vertically placed one after another. The bus bars should be air insulated but must be HT PVC sleeved & color coded for R-Y-B. No live parts should be accessible. All joints should be covered with monoplast compound and color coded for easy identification. The feeder connection to the bus bars is preferred to be encapsulated.

FRONT DOOR

The front door of the breaker should not be set as front. High-Voltage door during switching operations, the high-voltage door should remain closed and mechanical interlock should prevent opening of door when the switching device is in service and is switched ON. The position of the withdraw-able section, the CLOSED/OPEN switch position of the switching device, the operating cycle counter and the “spring charged” indication should be visible through pressure-resistant inspection windows in the high-voltage door. The panel front door can be closed with the breaker in isolated position. The degree of protection in the panel is IP-43 as per Indian Standard IS 3427.