Revamping of Main Receiving Station 2 including integration of SCADA enabled centralized electrical control and monitoring system with feeder monitoring system and NFMS integration at Technopark phase 1 campus

HT PANEL - A (I/C - #2, O/G - #8, B/C - #1)

Supplying, installation, testing and commissioning of indoor type, floor-mounted, dust and vermin-proof, metal-clad OEM-manufactured and type-tested 11 kV VCB panel comprising 11 Nos. VCBs, totally enclosed, fully interlocked, horizontal draw-out, horizontal isolation type, as per IEC 62271-200 and IS 13118, as amended up to date and as per detailed specification, drawings, and SLD. The panel shall be suitable for operation on 11 kV, 3-phase, 50 Hz A.C. supply with short-circuit fault level not less than 500 MVA, and shall be complete in all respects, including self-contained interlocking system, rack-in/rack-out mechanism, air-insulated, electrolytic aluminum busbars (1250 A rated), and mechanical ON/OFF indication, hand trip device, spring release coil, shunt trip coil, auxiliary switch (minimum 4 NO + 4 NC), etc., suitable for termination of cables upto 3R x 1C × 500 sq.mm XLPE 11 kV cable (bottom entry) with heat-shrinkable end terminations and all accessories as required. The HT panel shall be provided with humidity monitoring and internal anti-condensation space heaters of adequate rating for effective moisture control within all applicable compartments (refer 10.2.21 (T) of technical specification).

Panel Construction: The panel shall be of indoor, floor-mounted, free-standing, dust-proof and vermin-proof, metal-clad, withdrawable cubicle type construction, manufactured by an OEM and conforming to a type-tested design. The switchgear shall have a minimum classification of LSC2B-PM and Internal Arc Classification (IAC) AFLR 26.3 kA for 1 second in accordance with IEC 62271-200. The enclosure shall be fabricated from prime-quality aluminium-zinc coated steel sheets or pre-galvanized steel sheets of minimum 2.0 mm thickness (or equivalent mechanical strength), fully compartmentalized, with hinged, earthed front doors interlocked with the associated earth switch. All cable entry openings shall be effectively sealed using approved waterproof, fire-stop, and vermin-proof sealing materials to prevent the ingress of water, moisture, dust, snakes, rodents, insects, and other vermin into the panel.

Power Pack/UPS: HT panel shall include a POWER PACK/UPS of required capacity for auxiliary power supply unit with all accessories required for complete installation.

INCOMER-01

(a) 1 No. 12 kV, 1250 A, 26.3 kA, horizontal draw-out, horizontal isolation type Vacuum Circuit Breaker (VCB), complete with motorized spring charging mechanism, shunt trip coil, closing coil, anti-pumping relay, trip-free mechanism, mechanical ON/OFF indication, operation counter, and all associated accessories.

(b) 1 Set of 3 Nos resin-cast Potential Transformers (PTs), drawout type, ratio 11 kV/√3 : 110 V/√3, Accuracy Class 0.2, burden 100 VA, complete with HT protection fuses/MCBs, one digital voltmeter (0–15 kV), voltmeter selector switch, and all associated wiring.

(c) 1 Set of 3 Nos. resin-cast dual-core, dual-ratio Current Transformers (CTs), ratio 400/200/5 A, Metering Core: Accuracy Class 0.2S, burden 15 VA, and Protection Core: Class 5P10, burden 15 VA, complete with one digital ammeter, one digital Multifunction Meter (MFM) with RS-485 communication port supporting Modbus RTU protocol for SCADA integration, ammeter selector switch, and all necessary accessories. The CT ratio specified is indicative only. The contractor shall determine and propose the final CT ratio based on the actual connected load and system requirements, and obtain prior approval from Technopark before procurement and installation to accommodate any variation in load requirements.

(d) 1 No. microprocessor-based numerical protection relay providing ANSI 50/51 Overcurrent and 50N/51N Earth Fault protection, Trip Circuit Supervision (TCS), DC Supply Supervision, breaker failure indication, event and fault recording, disturbance recording, self-diagnostics, and communication ports supporting IEC 61850 and/or Modbus RTU/Modbus TCP, as specified.

(e) 1 No. HT Tri-Vector TOD Energy Meter, Accuracy Class 0.2S, with RS-485 communication port supporting DLMS/COSEM and Modbus RTU protocols, complete with all wiring and accessories