SPECIAL REPAIR TO HIGH TENSION (HT) NETWORK SYSTEM, RMU, RELAYS, VCB AND OTHER CONNECTED WORKS UNDER GE (A) AHMEDABAD CANTT

Material & Labour for Testing & Calibration of VCB Protection Relay any make and type (Digital / Numerical Over current relay / Earth Fault Relay , Differential relay, Auxiliary) after Isolation of the relay / CT-PT secondary circuits and visual inspection of wiring, terminals and relay case for damage/moisture ingress and cleaning of relay case, terminal blocks and test-plug contacts carried out secondary injection test of the relay using a calibrated relay test kit and pick-up current/voltage, time-current characteristic (definite time / IDMT curve as set), and instantaneous element check against the approved relay setting sheet as well as primary injection test to verify CT ratio, polarity and over all protection scheme continuity from CT through relay to trip coil including check the Trip-circuit healthiness / continuity and verification & re-entry of relay settings as per the latest approved protection co-ordination as per requirment and then again carried out functional trip test / relay operation to actually trip the associated breaker complete all as specified and directed. Note :- (i) Necessary T & P for repair will be in the scope of contractor / own arrangement of the contractor. (ii) Arranging power shutdown/outage with the Discom (to be coordinated through the consern JE E/M / Engineer-in-Charge).

Repair, Maintenance, Servicing and recommissioning, Testing of 11 KV Vacuun Circuit Braker (VCB) of any make, capacity and type (Fixed / Withdrawable) complete with Isolation, withdrawal (for withdrawable type) or de-energising & earthing (for fixed type) of the VCB truck before the work start and dismantling of the breaker pole assembly for visual inspection of vacuum interrupter bottles, insulation, operating rod and contact travel and carried out contact-resistance test across each pole; vacuum-integrity test on each interrupter bottle (HV withstand / lightning-impulse type test surrogate as per OEM procedure and overhaul of spring-charging/operating mechanism (i.e.springs, cams, bearings, linkage, gear-train), lubrication and checking closing/tripping-time measurement including contact-travel, contact-wipe and simultaneity (phase-to-phase closing/opening time difference and do the adjustment as per OEM tolerance limit complete with Insulation Resistance test and functional test of all inter-locking between (earth-switch / breaker / door), mimic diagram and indication lamps / flags after that re-assembly, racking-in (withdrawable type) and functional trial operation (local & remote) complete all as specified and directed. Note :- (i) Necessary T & P for repair will be in the scope of contractor / own arrangement of the contractor. (ii) Spare part required for replacement shall be measured and paid for separately under supply only item in respective item of this schedule. (iii) Arranging power shutdown/outage with the Discom (to be coordinated through the consern JE E/M / Engineer-in-Charge).

Repair, Maintenance, Servicing and recommissioning, Testing of 11 KV Ring Main Unit (RMU) of any make and capacity complete after De-energising, isolating, discharging and earthing the RMU before starting work and opening RMU enclosure/tank for visual & physical inspection of bushings, cable boxes, interlocks, gaskets and insulating surfaces including cleaning of internal chambers, bus-bars, contacts, insulators/bushings with contact cleaner/solvent and lint-free cloth and carried out mechanical operation check (manual & electrical like open / close / trip and contact-resistance test on VCB & LBS main contacts including overhaul of charging spring, check spring-tension, operating mechanism, lubrication, caMaterial and labourinkage adjustment and replacement of unserviceable parts and charging of SF6 gas up to (due-point) pressure & moisture if found deficient and carried out Insulation Resistance (IR) test at 5kV on all phases-to-earth and phase-to-phase after repair work carry out High-Voltage test with stand as per manufacturer's manual and functional test of all inter-locking between (earth-switch / breaker / door), mimic diagram and indication lamps / flags complete all as specified and directed. Note :- (i) Necessary T & P for repair will be in the scope of contractor / own arrangement of the contractor. (ii) Spare part required for replacement shall be measured and paid for separately under supply only item in respective item of this schedule. (iii) Arranging power shutdown/outage with the Discom (to be coordinated through the consern JE E/M / Engineer-in-Charge).

Supply only item as follows: - (Component of VCB's & RMU ) (a) Vacuum Interrupter Bottle, 11kV, 630A (VCB pole unit)

VCB Spring-Charging / Operating Mechanism spares (springs, cams, bearings, linkages)

Trip Coil, DC 24/110/220V

Closing Coil, DC 24/110/220V

Auxiliary Switch / Contact Block (52a/52b)

HRC Fuse any capacity & Amps suitable for 11 KV RMU

Fixed & Moving Contact Assembly, per pole (set of 3 poles)