PROVN OF RMUs AND VCBs AT DOMESTIC AREA UNDER GE (AF) ADM AREA AT AF STATION AGRA

Supply, installation, testing and commissioning of 11 kV class, 12 kV rated, outdoor, SF₆ gas-insulated Ring Main Unit (RMU), 5-way, one-side extensible, manual-operated type, complete with one manual vacuum circuit breaker (VCB) incomer and four manual VCB outgoing feeders, suitable for ring-main distribution, including bus metering panel, all specified accessories, interconnections, protection, earthing, cable termination provisions and all works necessary for a complete and operational installation, as specified below and as directed by the Engineer-in-Charge.

A. RMU Main Assembly. i) RMU configuration: 5-way, outdoor, SF₆ gas-insulated, one-side extensible, manual-operated RMU, comprising 1 No. VCB incomer + 4 Nos. VCB outgoing feeders, with bus metering panel (Me) and arrangement (LLLLL+Me). ii) Rated voltage: 12 kV. iii) Power frequency withstand voltage: 28 kV. iv) Lightning impulse withstand voltage: 75 kV. v) Rated current: 630 A for ring-main feeder at 40°C. vi) VCB feeder rated current: 630 A. vii) Short-time withstand current: 21 kA for 1 second, or as per the approved manufacturer’s guaranteed technical particulars. viii) Rated short-circuit making current: 50 kA, subject to approved OEM technical data. ix) Internal arc classification: IAC AFLR, 21 kA for 1 second, with pressure relief directed downwards, as offered and subject to approved OEM technical particulars. x) Main busbar material: Copper (Cu). xi) Enclosure: Outdoor, minimum IP54 degree of protection. xii) Ambient temperature: Suitable for operation at 40°C. xiii) Current rating / derating: 630 A at 40°C, 600 A at 45°C and 565 A at 50°C, or as per approved OEM guaranteed technical particulars. xiv) Paint finish: Powder-coated, RAL 7032, coating thickness 100 microns ±25 microns. Complete with all required SF₆ gas compartments, operating mechanisms, busbars, interconnections, cable compartments, pressure-relief arrangements, nameplates, warning labels and manufacturer’s standard accessories.

B. Vacuum Circuit Breaker Feeders — 5 Nos. Each VCB feeder shall include: i) One manual-operated VCB with ON–OFF position indication. ii) VCB auxiliary switch arrangement 2NO + 2NC + 2CH. iii) Manual disconnector with three-position ON–OFF switching arrangement. iv) Manual-operated spring mechanism with OFF–EARTH position indication. v) Numerical relay for 3O/C + 1E/F, Siemens C&S / Ashida make or approved equivalent, without RS485 port, complete with required protection functions and accessories. vi)One low-energy series release. vii) Three Nos. current transformers, ratio 400–200–100/1 A, Class 5P10, Cl. 1.0, burden 2.5 VA, make Reco / NPT or approved equivalent. viii) Socket for capacitive voltage indicator (CVI), Leenan make or approved equivalent. Padlocking facility. ix) Provision for connecting up to 1R × 3C × 300 sqmm HT power cable, including suitable cable-entry arrangements. x) All necessary internal wiring, terminal blocks, control wiring, operating handles, labels and accessories for complete operation.

C. Bus Metering Panel The bus metering panel shall include: i) Three Nos. 11 kV / √3 / 110 V / √3 / 110/3 V, Class 1.0, 50 VA, 3P, 50 VA voltage transformers, or as per approved OEM technical particulars. ii) One surge arrester. iii) One set indicating lamps R, Y, B, thermostat, space heater, 2-pin plug and socket. iv) One digital multifunction meter (MFM), Class 0.5. v) Complete internal wiring, terminal blocks, metering connections, labels and accessories. D. Common Accessories i) One No. operating lever. ii) One set cable boot, including all required accessories. iii) All necessary operating, locking, interlocking, earthing and safety accessories. iv) Manufacturer’s standard tools, keys and accessories required for operation and maintenance. E. Installation and Erection Scope The item shall include, but not be limited to, the following works: i) Transportation of the RMU from the manufacturer’s works / approved storage location to the site, including unloading, shifting, handling and placing at the designated installation location.

ii) Providing and constructing complete PCC/RCC foundation for 11 kV RMU ,5 way as per OEM approved foundation drawing and recommendations, including excavation, reinforcement, shuttering, anchor bolts, grouting, levelling, finishing, cable entry provisions and all associated civil works, complete in all respects, including all materials, labour, T&P and incidental works, the cost thereof being deemed included in the quoted rate of RMU. (iii) Assembly and interconnection of all RMU sections, including busbar and cable-compartment connections, as per approved manufacturer’s installation instructions. iv) Installation of all VCB feeders, manual operating mechanisms, disconnectors, earth switches, protection relays, CTs, VTs and metering panel accessories. v) Installation of all internal control wiring, terminal blocks, auxiliary contacts, indication lamps, interlocks and associated accessories. vi) Installation and connection of the bus metering panel, including VT connections, metering wiring and MFM connections. vii) Connection of all incoming and outgoing 11 kV HT power cables, including cable entry, cable boots, glands, lugs, termination kits, cable support and dressing, wherever required for the complete installation. viii) Connection of RMU earth terminals to the station earthing system, including earth continuity connections and bonding of all required metallic parts. ix) Installation of all required cable supports, clamps, cleats, glands, lugs, ferrules, tags and other accessories necessary for a neat and safe installation. x) Checking of all mechanical and electrical interlocks, padlocking facilities, operating mechanisms and position indications. xi) Checking of SF₆ gas pressure / density indication, gas-tightness, pressure-relief arrangements and all manufacturer-specified safety provisions.

xii) Providing all necessary minor civil / electrical works incidental to installation, including drilling, fixing hardware, sealing of cable entries and making good the work, wherever required. F. Testing and Commissioning Scope. Testing and commissioning of the complete 11 kV, 5-way outdoor SF₆-insulated RMU, including visual inspection, verification of ratings and approved drawings, insulation and contact resistance testing, mechanical operation and interlocking checks of all VCBs, disconnectors and earth switches, testing of VCB closing/opening operation, spring mechanism and auxiliary contacts, testing of overcurrent and earth-fault protection relays, CTs, VTs, metering circuits and digital MFM, checking of SF₆ gas pressure/density indication, HT cable terminations, phase identification and earth continuity, complete functional testing of all five feeders, and submission of test reports, commissioning records and manufacturer’s certificates, all as per approved manufacturer’s instructions, relevant standards and as directed by the Engineer-in-Charge.

G.The contractor shall provide: The contractor shall provide approved GA drawings, single-line diagrams and wiring diagrams; manufacturer’s technical particulars and guaranteed technical data; factory test certificates / routine test certificates; installation and commissioning test reports; protection relay test reports and settings; operation and maintenance manuals; SF₆ gas handling / filling records, wherever applicable; as-built drawings and cable termination details; warranty certificates and manufacturer’s recommended maintenance schedule; and complete handover of the installed RMU in safe, tested and operational condition, all as specified and directed by the Engineer-in-Charge. Note:- Rate shall include: Supply, transportation, unloading, shifting, installation, erection, testing, commissioning, all materials, labour, tools, tackles, consumables, accessories, cable termination provisions, earthing connections, documentation and all incidental works required to complete the installation in all respects, as specified and directed by the Engineer-in-Charge.

Supply, installation, testing and commissioning of 11 kV class, 12 kV rated, outdoor, SF₆ gas-insulated Ring Main Unit (RMU), 6-way, one-side extensible, manual-operated type, complete with one manual vacuum circuit breaker (VCB) incomer and five manual VCB outgoing feeders, suitable for ring-main distribution, including bus metering panel, all specified accessories, interconnections, protection, earthing, cable termination provisions and all works necessary for a complete and operational installation, as specified below and as directed by the Engineer-in-Charge.

A. RMU Main Assembly i) RMU configuration: 6-way, outdoor, SF₆ gas-insulated, one-side extensible, manual-operated RMU, comprising 1 No. VCB incomer + 5 Nos. VCB outgoing feeders, with bus metering panel (Me) and arrangement (LLLLLL+Me). ii) Rated voltage: 12 kV. iii) Power frequency withstand voltage: 28 kV. iv) Lightning impulse withstand voltage: 75 kV. v) Rated current: 630 A for ring-main feeder at 40°C. vi) VCB feeder rated current: 630 A. vii) Short-time withstand current: 21 kA for 1 second, or as per the approved manufacturer’s guaranteed technical particulars. viii) Rated short-circuit making current: 50 kA, subject to approved OEM technical data. ix) Internal arc classification: IAC AFLR, 21 kA for 1 second, with pressure relief directed downwards, as offered and subject to approved OEM technical particulars. x) Main busbar material: Copper (Cu). xi) Enclosure: Outdoor, minimum IP54 degree of protection. xii) Ambient temperature: Suitable for operation at 40°C. xiii) Current rating / derating: 630 A at 40°C, 600 A at 45°C and 565 A at 50°C, or as per approved OEM guaranteed technical particulars. xiv) Paint finish: Powder-coated, RAL 7032, coating thickness 100 microns ±25 microns. Complete with all required SF₆ gas compartments, operating mechanisms, busbars, interconnections, cable compartments, pressure-relief arrangements, nameplates, warning labels and manufacturer’s standard accessories.

B. Vacuum Circuit Breaker Feeders — 6 Nos. Each VCB feeder shall include: i) One manual-operated VCB with ON–OFF position indication. ii) VCB auxiliary switch arrangement 2NO + 2NC + 2CH. iii) Manual disconnector with three-position ON–OFF switching arrangement. iv) Manual-operated spring mechanism with OFF–EARTH position indication. v) Numerical relay for 3O/C + 1E/F, Siemens C&S / Ashida make or approved equivalent, without RS485 port, complete with required protection functions and accessories. vi)One low-energy series release. vii) Three Nos. current transformers, ratio 400–200–100/1 A, Class 5P10, Cl. 1.0, burden 2.5 VA, make Reco / NPT or approved equivalent. viii) Socket for capacitive voltage indicator (CVI), Leenan make or approved equivalent. Padlocking facility. ix) Provision for connecting up to 1R × 3C × 300 sqmm HT power cable, including suitable cable-entry arrangements. x) All necessary internal wiring, terminal blocks, control wiring, operating handles, labels and accessories for complete operation.