purchase & stores division - ISRO

Trip circuit
Indicating lamps
CTs wiring
MCBs input power
Master Control Facility – Hassan
: ACBs / MCCBs shunt trip power supply shall be taken independently
through MCBs from auxiliary busbars.
: Wiring for presence of input power, ACBs / MCCBs ON / OFF and fault trip
status indication.
: Isolators for digital TVM & shorting links for analog meters shall be used.
: Multiple MCB’s input power supply should be tapped through 125A SDFU
for short circuit protection.
Name plates / stickers
Name plate : Nameplates for Transformers & Generators incomers and each outgoing
feeder outlets shall be provided.
: Each nameplate shall contain feeder no, switchgear rating and
nomenclature.
: Nameplates size, design, and color combination and nomenclature for
each output feeder will be furnished during approval of drawing.
: The approved SLD of the panel shall be screen-printed / computerized
print over an A3 size 2 mm thick aluminum sheet or foam board. It shall be
fixed at top-center of the panel.
Laminated stickers : Laminated stickers of suitable size with good quality adhesive shall be
fixed at each terminal blocks, meters, relays on the inner side for clear
Panel specification
plate
Grounding / Earthing
Type
Panel earth bus
Switchgear
Panel doors
Meters / relays
Inspection / Testing
First stage
inspection
Final inspection &
testing
identification.
: The panel shall have the specification plate as per the IS reference
standard 2675
-Rated voltage AC or DC Hz
-Total number of outgoing ways / feeders
-Rated current of each outgoing feeders
-Number of poles
-Manufacturer name / Trade mark / Address
-Customer PO reference and date
-Year of manufacturing
: Two-point ground in accordance with the recommendations of IEEE
Standard and the requirements of the NEC.
: High-purity electrolyte copper E-Cu 57 busbar of size 50x6 mm should be
run all along the width of the panel at front or rear bottom surface.
: All ACBs and switchgears body shall be earthed by 25x3 mm copper strip.
: Doors shall be earthed, if electrical equipment (meters / relays / lamps)
mounted by a yellow green 2.5 Sq. mm wire lugged at both ends.
: All meters / relays shall be earthed to the profile by a yellow green 2.5 Sq.
mm wire lugged at both ends.
: Mechanical -structural fabrication after approval of GA drawing.
: Verification of components as per PO bill of material.
: Minor modifications in mechanical / electrical changes pointed out by MCF
inspecting officer shall be carried out, if necessary, without additional cost.
: After integration of switchgears and wiring.
: Inspection and testing as per checklist.
: Calibrated testing & measuring instruments are to be used for routine test.
: Any deviations from the specifications or in testing shall be attended &
offered for re-inspection.
Semi Modular substation LT panel –Specification 6