PRESS NIT No.01, ITEM NO.01(2025-26)

11kV Compact Substation (CSS) shall be a type-tested, metal-enclosed prefabricated substation suitable for outdoor installation. It shall house an 11kV Ring Main Unit (RMU), distribution transformer, and Low Voltage (LV) switchboard in a compact, weatherproof, tamper-proof enclosure comply with standard or relevant IS of components ,Parameter Specification:-System Voltage (HV) 11kV, 3-Phase, 50Hz,Transformer Rating [Specify: 500 kVA],HV Switchgear SF6 or Vacuum insulated RMU,LV Voltage Output 433 V, 3-Phase, 4-wire Cooling Type ONAN (Oil Natural Air Natural)Degree of Protection IP54 for enclosure,Installation Location Outdoor (Pad-mounted / Plinth-mounted),Ambient Temp Range -5°C to +50°C 1. Major Components-1.1 High Voltage Compartment (RMU):Type-tested RMU, SF6 or vacuum insulated, Rated Voltage: 12kV,Rated Current: 630A,Short-time withstand: 20kA for 3 sec,Protection: Feeder protection relay with metering,Manual or motorized operation 1.2 Transformer Compartment:Type: Hermetically sealed or conservator-type, Core type: CRGO / Amorphous (as specified), Insulating Medium: Mineral Oil / FR3 / Synthetic Ester (as specified) • Temp Rise: 50°C for Oil, 55°C for Winding, HV & LV bushings: Cable box or plug-in type 1.3 Low Voltage Compartment • Outgoing feeders: MCCBs/MCBs as specified, Incomer: ACB MDO 800Amp. TP with metering,Metering: Digital multi-function meter, Cable entry: Bottom / Top (as specified),Busbar: Rated for transformer capacity, 50kA for 1 sec 2. Enclosure • Material: Galvanized Steel Sheet (minimum 2 mm thick),Finish: Powder-coated with anti-corrosive treatment, Roof: Sloped with rainwater drainage, Doors: Lockable with anti-vandal features,Lighting and ventilation: Internal light and louvers/fans 3. Protection and Safety • Overcurrent and earth fault protection for HV and LV sides, Surge arresters on HV side,Neutral grounding on transformer LV side (solid/through resistor), Earthing terminals for all compartments, Danger signage and mimic diagram 4. Accessories • Cable glands and lugs, Lifting hooks and skid base, Fire extinguisher bracket, Earthing rods and cables (as per BOQ) Make: L&T/ABB/Siemens/CG/DJB Approved

S/O XLPE insulated 11KV 185 sq mm 3 core cable Make: Gloster/Havells/Polycab/ Grandlay/DJB APPROVED MAKE

P/F of sencing current Transformer with control wire for current sencing for APFC panels

S/O PVC insulated 240sq mm 3.5 core aluminum armored Make: Gloster/Havells/Polycab/Grandlay/DJB APPROVED MAKE

Installation of CSS unit ,making foundation/base frame as per relevant IS for fixing the CSS unit

Installation of APFC panels ,making foundation/base frame as per relevant IS for fixing the APFC panel

Laying of HT cable & making connection as per site requirement & making connection of termination kit

Laying of LT cable & making connection as per site requirement in CSS unit 2Nos. & APFC panels 2Nos.

Testing & commissioning of CSS unit as per required parameters with relevant IS. testing of the System prior to switching on as Continuity and earth testing, Meggaring of all equipment’s for phase to phase, neutral to body, neutral to earth and phase to earth.

Testing & commissioning of APFC panels as per required parameters with relevant IS. testing of the System prior to switching on as Continuity and earth testing, Meggaring of all equipment’s for phase to phase, neutral to body, neutral to earth and phase to earth.

Gupta Brothers (BID ID -1578643)