PROVISION OF EXTERNAL ELECTRICAL SUPPLY FOR INFRASTRUCTURE AT 7.426 ACRES LAND AT NAVAL STATION KOCHI

Supply, install, connecting up existing cables, testing and commissioning of HT 12 KV rated voltage and 11 KV operating voltage, 21 kA for 3 seconds, 3 phase 50 Hz,IP 54, SCADA compatible,motorised, two way Ring Main Unit (+CV+) comprising one number vacuum circuit breakers duly interlocked as Outgoing and one number motorised load break isolator as Incoming , battery chargers, totally enclosed metal clad switch gear with motorized 24 volt DC battery bank and charger, protection relays, having rated current of Ring Switch and Breaker is 630 Amp, both side extensible, with internal arc classification with AFLR with 21 kA for one second, copper bus bar with danger notice board, with factory made weather proof enclosure by the switchgear manufacturer and connecting existing cables to new RMU. The unit shall be painted in RAL7012/7035 paint shade with folowing specifications and all as per theIEC 60298,IEC 60265, IEC 60129,IEC 60420,IEC 60056,IEC 60694 and as per the specification of the manufacturer of Make : SIEMENS / ABB/SCHNEIDER.

(a) Ring Switch/Isolator (i) Capacity 11 KV, HT, 630 Amps. Triple pole, single break, having three position ('ON', 'OFF' and 'EARTH') Ring Main Switches, each with independent motor charged spring mechanism and fully rated earth switch. (ii) Air insulated cable boxes with gland plate suitable for bottom entry of single run of three core cable up to 300 sqmm. (iii) Cable Bushings (iv) Capacitive Voltage Indicator with LED Display. (v) Mimic diagram on front panel, complete with status indicators (ON-OFF-EARTH). (vi) Actuator Kit for motorised operation. (vii) One set of Potential Free contacts for SCADA Compatibility. (viii) Fault Passage Indicators (ix) One set of Right Angle Boots-NON TOUCH PROOF

(b) Vacuum Circuit Breaker : (i) Capacity 630 Amps, Triple pole, Vacuum Circuit Breaker, with independent motor charged spring mechanism and fully rated earth switch, with provision for earth of the cable. (ii) Air insulated cable box with gland plate suitable for bottom entry of single run of 3-core cable up to 300 sqmm. (iii) multi powered Over current, Earth Fault and short circuit three element numerical Relay with digital display(iv) Resin cast current transformers for protection mounted on Cable / cable box of ratio 60-30/1A, 5P10, 2.5VA. (v) Capacitive Voltage Indicators with LED Display. (vi) Mimic diagram on front panel, complete with status indicators (ON-OFF-EARTH). (vi) Motorised assembly. (vii) Epoxy Moulded low energy Tripping Coil for tripping the circuit breaker in fault condition. (viii) Right Angle Boots-NON TOUCH PROOF. (ix) Make of RMU and VCB bottles to be same.

(c) General spacifications : (i) One set of positive standard mechanical interlocks to avoid unsafe operations. (ii) Provision of pad locking for open, close, earth position in correct sequence. (iii) Mano meter for indicating SF6 gas pressure with green and red zone. (iv) Three mm thick stainless steel SF6 tank with robotically welded construction with IP67 protection. (v) External stud for earthing connections. (vi) SF6 Gas re filling provision. (vii) Extendable bushings future for future extension with metallic end cap cover. (viii)Battery with charger (ix) Necessary foundation for RMU, weather protection roofing using galvolume sheet to be deemed in the quoted rate. Note:- Testing and Commissioning of RMU should be carried out by OEM rep at the site in presence of Engineer-in-charge.

Supply and laying in trenches, or fixing on walls or passing through cable duct / pipe XLPE insulated, screened, PVC bedded galvanised steel strip or wire armoured electric power cables (heavyduty Earthed Grade) with aluminium conductor, 11000 volts, grade having cross sectional area 3 core 185 sqmm including taking down old item, all as specified.

Supply and fixing of cable jointing kit for 11 KV (Earthed) grade cable for outdoor termination heat shrink type joint complete with jointing material and accessories suitable for XLPE armoured aluminium conductor cable of size 120 sqmm to 185 sqmm x 3 core all as specified. Make : 3M M-seal / Raychem / Denson / Cab Seal

Supply and fixing , cable straight through jointing kit for 11 KV (Earthed) grade cable, heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 120 sqmm to 185 sqmm all as specified. Make : 3M M-seal / Raychem / Denson / Cab Seal

S&F cable route indicator over the HT cables made out of cast iron block of size 15x10 cm and thicknes 10 mm fixed with MS strip of size 32x4 mm upto length 75 mm and marked with 'MES HT Cable 185 /240 /300 Sqmm ' as required on cast iron block including necessary PCC and earth work etc complete including taking down old route indicators all as directed by the Engineer-in-charge.

Excavation in trenches not exceeding 1.5 metre wide and not exceeding 1.5 metre in depth and getting out in soft / loose soil for laying/removal/identifying the fault/relaying of cable etc all as specified and directed.

Returning , filling ,in including spreading, levelling, watering and well ramming in layers not exceeding 25 cm thick in soft / loose soil complete all as specified and directed.

Removing excavated soil to a distance not exceeding 50 metre and depositing where directed at a level, not exceeding 1.5 metre above the starting point complete all as specified and directed.

M&L for riddled soil cushioning and covering of UG cables in trenches (Note : For measurement purpose only punned thickness shall be measured and paid )

Supplying and laying un-reinforced precast concrete cable cover, class HV, type 1, flat size 300 mm x 180 mm x 40 mm. laid in trenches for protection of cable all as specified ,.

M & L 100 mm bore High density polyethylene pipes (HDPE) PN 10 laid in trenches/Wall/road crossing for suitable length as per sire requirement all as specified.

Cutting into existing bituminous carpet road/PCC hard standing/tiles for laying of pipes/UG cables, re filling, ramming and making good the disturbed surfaces with cold mix bitumen to match with the existing complete all as directed.

Supplying, Installing, Connecting, Commissioning and Testing of Transformer, Step Down, Outdoor type, 11 KV / 433 V [at No load], AC, 3 Phase, 50 Hz, of 750 KVA capacity, Double Copper Wound, Oil immersed, CRGO Core type Naturally cooled, Built-up with class "A" insulation, designed & constructed with particular reference to Tropical Condition, conforming to IS – 1180 [Part-I], Level-2 with latest amendment comprising of the following Specification and Fittings:- Continuous Rating : 750 KVA No-Load Voltage Ratio : 11 KV / 433 V Tapping on HV [%] : ± 7.5, ± 5, ± 2.5 Phase & Frequency : 3 Phase & 50 Hz Connection : Delta Star Vector Group : DYN 11 Cooling : ONAN Type : Outdoor with HV/LV cable Box

Fittings: [a] Externally hand operated Off–Circuit Tap Switch with position indicator and locking device. [b] Conservator with Oil Gauge, filling hole with plug & drain hole with plug [c] Undercarriage with four plain rollers [d] Oil filling hole cum air release plug [e] Drain Valve cum Sampling Valve [f] Top Filter Valve with Plug [g] Rating Plate with Diagram Plate [h] Lifting lugs for Transformer [j] Lifting lugs for Core [k] Earthing Terminals [l] Thermometer Pockets [m] Silica Gel Breather [n] Explosion Vent [o] Double Float Buchholz with alarm and trip contacts including control cable of copper conductor of size & length from Marshalling Box to Relay of VCB [p] 150mm size Oil Temperature indicator, dial type with alarm and trip contacts [q] 150mm size Winding Temperature indicator, dial type with alarm and trip contacts [r] Buchholz Relay with 2 Shut-Off Valves [s] Marshalling Box with Double Window

Terminal Arrangement: [i] HV & LV side: Cable Box [ii] Quad furcating cable box with five compression glands for PVC Cable and One additional neutral terminal shall be brought out separately for earthing purpose on LV Side. [iii] First filling of new and unused Transformer Oil [IS – 335 Marked], filtered and tested up to 60KV dielectric strength at 2.5mm air gap between testing electrodes. Certification of dielectric strength shall be submitted by the Contractor after filling the oil. [iv] Apart from routine tests mentioned in these tender documents and relevant IS, pre-commissioning inspection of Transformer shall be carried out by Senior Electrical Inspector / Electrical Inspector. [v] All necessary arrangements with devices for measuring the temperature of core winding and oil shall be done by contractor deemed to be included in the quoted rate [vi] The drawings of the transformer should be approved by the accepting officer before placing order. [vii] The factory acceptance test to be done by the rep of Accepting officer prior to dispatch. [viii] Platform: Platform for the transformer shall be provided as per IE rules of size not less than 2.0mx2.0mx1.8m made of brick masonry using fly ash bricks built in CM 1:6 over 100mm thick concrete bed in PCC 1:4:8, type D-2 using 40mm graded stone aggregate over 150mm thick hard core of gauge not exc 63mm of broken stone or boulders, deposited, spread and levelled in layers including providing 100mm thick PCC 1:2:4 coping in type B-1 over top of platform and rendering 15mm thick in CM 1:4 finishing the surfaces even and smooth without using extra cement and applying three coats of white wash including necessary excavation, earth work as required complete all as per manufacturers instructions and as directed by the Engineer-in-Charge