purchase & stores division - ISRO

Impulse withstand voltage - 75 kV
Busbar rating - 120 % of rated continuos current
Application - 1MVA Transformer switching
Integral Earth switch – required
Type: Horizontal draw out type with cradle assembly & metal
ramp
Operation -
Spring closing mechanism - Electrical motor operated OR
Solenoid
Breaker Closing - Manual & Electrical through TNC switch /
closing coil (110 V a.c derived from P.T)
Under voltage release - 110 V a.c derived from P.T
Shunt trip coil - 24 V d.c
Safety interlock 7 locking facility – Required
……………………………………………………………………
2.1 Metering: Digital TVM for measuring power parameters,
energy, harmonic parameters etc.,. with SNMP / RS 485 output
interface. Software for remote M&C shall be supplied.
Make: Satec. Model : PM 130 EH
Analog Voltmeter, Size: 96 x 96 with selector switch
Max. demand type Analog Ammeter ; Size: 96 x 96 with selector
switch
Phase sequence meter Size: 96 x 96 with selector switch
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2.2 Protection Relay: Microprocessor based transformer
protection relay with SNMP / RS 485 output interface.
Features: 3 PHASE OVER CURRENT, EARTH FAULT RELAY +
THERMAL FOR TRANSFORMER, 20-110V AC/DC
Device code: 50/51, 46, 49
Design: Numeric
Functions: Low set and High set Over current
Low set and High set Earth Fault with site selectable Trip
characteristics, Definite inverse time tripping Thermal overload.
Display of parameters, built in self supervision, RS 485 Port
communication
Make: L&T, Model: IM 30 T
Software for remote M&C shall be supplied.
……………………………………………………………………
2.3 Master trip relay: High speed Relay with manual reset
Type VAJH 13, Alstom make
………………………………………………………………….
2.4 Metering & protection CT's - Resin cast dry type
Single phase, 2 core
Ratio – 75-150/ 5 - 5 A
Core - 1: Class - 1.0 15 VA
Core II - Class 5P10, 15 VA
Suitable for STC of 26.3 kA for 1 sec
…………………………………………………………………….
VCB BOM
mentioned
Sl 2.0 to
2.11 is for
individual
VCB
modules
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