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| 1 | Supplying installation, testing and commissioning of Indoor Vaccum Circuit breaker (Incoming cum Outgoing), totally metal clad horizontally isolated and horizontally draw out type Consisting of VCB 400 amps HT 11 KV, should be capable to operate at voltage variation of ±10%, corresponding highest system voltage 12 KV,3 phase, frequency 50 Hz with ±3% tolerance, breaking capacity of 13.1 KA, having rupturing capacity 250 MVA for 3 seconds horizontal isolationconforming to IS-13943 of latest version and horizontal draw out type 11 KV totally enclosed extensible pattern with automatic drop down and independent spring charging type motor operated closing mechanism including motor suitable for operation on 230 volt single phase 50 cycle AC supply system and manually operating system with 30/110 volt DC shunt trip coil with Auxiliary switches mechanical ON/OFF indicator with protective relays and conforming to IS 3427 of 1997 to latest amendment, suitable for tropical conditions of max ambient temperature 50 deg and minimum temperature 3.5 deg with relative humidity 10% to 95%, with main bus bar shall be of copper, the Vacuum circuit breaker should be of truck/trolley mounted and must have three nos resin encapsulated vacuum bottles of same manufacturer as of circuit breaker, and vacuum bottles shall be epoxy encapsulated, the vacuum circuit breaker shall be fully tested for internal arc (13.1 KA for 3 sec) as per latest IEC 62271-200 at CPRI/ accredit lab complete all as specified with and including following items:- |
| 2 | (a) Auxiliary Power supply :The Auxiliary electrical equipments provided by the manufacturer for specified operation of the circuit breaker shall be suitable for operation for AC control & protective devices, lighting fixtures, space heaters 100 watt and motors AC supply 1 phase 2 wire, AC supply with one point grounded voltage : 240± 10% and frequency should be 50 Hz± 10%. For DC alarm, control and protective devices D.C. supply 2 wire, DC source from batteries with midpoint grounded. The available DC supply voltage is 30 V DC, Voltage : 30 V, -15% to +10%(b) Operating Mechanism Housing and Breaker Cabinets: The specification covers the requirements of control cabinets and associated equipment.Cabinets shall preferably be of the free standing floor mounting type for HV CBs. Sheet steel shall be at least 3.0 mm thick. Control cabinets shall be provided with double hinged door and padlocking arrangement. The enclosures shall be dust, moisture and vermin proof, to provide a Degree of protection to IP 55 in accordance with IS 12063/1987, 15mm thick neoprene or better type of gaskets shall be provided to ensure degree of protection of at least IP55 as per IEC: 529.It shall be accommodate following items: Mechanical ON & OFF knobs (TNC), Electrical ON/OFF push buttons, CB Mechanical ON/OFF indicator, CB Electrical ON/OFF indicator, Mechanical spring charged indicator, Electrical spring charge indicator , Auxiliary A.C./D.C. supply indication, Conveniently located manual emergency trip, Auxiliary switches as specified elsewhere in this Specification, Control cable termination connector blocks, One power plug along with control switch (240V, 10A), Space heater along with ON/OFF switch andThermostat, Cubical illumination lamp with switch, Mechanical Operation counter to register the number of breaker operations, Trip circuit Healthy-1 indication, Trip circuit Healthy-2 indication or any other as specified by the manufacturer shall be considered.(c)Self powered microprocessor controlled numeric relay comprising of two over current, one earth fault protection relay with high set for both phase and earth and with fault memory universal auxiliary supply as per IS-3231, 8686 The setting for over current shall be upto 200% of 5A and for earth fault element. |
| 3 | (d) Cast resin copper wound Current transformer (CT\"s) one set of three of ratio 50/25/5+5 Amps having 15 VA burden class 1.0, for metering and class 5P10 for protection- 01 Set of 03 Nos.(e)Cast resin copper wound Potential Transformer (PT) 11 KV / 110Volt 3 phase Potential transformer HT panel mounted, push fit with necessary fuses.(f)Digital Master trip relay -1 No & One No antipumping Relay(g) Digital type multifunction meter CT operated 110 Volts/ 30 having voltage , current, pf, frequency viewing facility (0-100 A), (0-15V)suitable for CT & PT ratio as stated above. Make; - Secure/L&T/Schinder/ ABB/ Seimens - One for each panel(h) The design, manufacture and performance of the Vacuum circuit breaker shall comply with all currently applicable statutes, regulations and safety codes. (j) Multifunction meter of Acc class 0.5, having facility to see KW, KVA, KVR, PF, KWH, KVARH, KVAH, A, V etc. (secure/ L&T make) & Master trip relay.(k) The circuit breaker shall be provided with motor operated spring charged closing. (l) Spring charging motor shall be suitable for 240V, 50 Hz, single phase AC. (m) Suitable rating starter shall be provided for Motor protection. Spring release coil for closing shall be suitable for 30V DC.Provision shall be available for charging the springs manually as well, and to close CB mechanically.(n) Adequate quantity of cable glands of suitable size shall be provided(o) Equipments and devices shall be suitable for operation on specified auxiliary A.C. supply system. For protection of AC/DC aux. circuits, MCBs of suitable capacity & reputed make to be provided.(p) The motor shall be adequately rated to carry out a minimum of 10 close and open operations continuously.Also, provision shall be made to protect the motor against overloads. In case of failure of power supply of spring charging motor, the mechanism shall be capable of performing one sequence of 0 - 0.3 Sec - CO. The time taken for charging of closing spring shall not exceed 30 seconds. The spring charging shall take place automatically preferably after a closing operation. |
| 4 | Name and Rating Plate: a) Circuit Breaker and its operating device shall be provided with rating plate/s made out of corrosion proof metal, marked with the following data. The data shall be either punched or engraved on the plates. b) Manufacturer\"s name or trade mark by which he may be readily identified., Serial number and type designation of CB & Operatingmechanism, Year of manufacture, Voltage, Lightning impulse withstand voltage, Normal current ,Short circuit breaking current, Duration of short circuit, Mass of circuit breaker with support structure, Auxiliary D.C. supply voltage of closing and opening devices, Out of phase making & breaking current, A.C. supply voltage of auxiliary circuits, Insulation level, Frequency, Operating sequence. The rating plates shall be installed in such positions that the same shall be clearly visible to a man standing on ground. i.e. at the level of eye site.Set of LED indicating lamp operating at 110V single phase as below: -(i) RED/GREEN. VCB ON-OFF Indication (ii) AMBER: Trip Indication(iii) WHITE: Trip Circuit Healthy Indication with Push Button(iv) BLUE: VCB Mechanism Spring Charged Indication(v) 11 KV, 250 MVA 400 Amps, Three Phase Copper busbars with Rear cable termination ie. Provision for terminating 3 core XLPE Cable of required size.(vi)Suitable no. of Space heater-100W (continuously rated) with thermostat control for breaker/CT compartment with manual ON-OFF switch.(vii) Structural steel frame including PCC foundation and earthwork as per manufacturer specifications.(viii)1 No 3-way breaker control switch with positions TRIP-NEUTRAL-CLOSE(ix) Both manual spring charging and motorised spring charging and operating arrangement. (x) Suitable size of MCBs for metering and protection circuit as per manufacturer specification.(xi) (a) Auto trip.(b) Motor/manual charged spring operating/closing mechanism.(c) Fault alarm (d) Manual tripping(xii) All wiring necessary for the above including interconnection to trip coil. The wire should be FRLSH type in all panels.(xiii) Test Terminal Block (TTB) to test meters and relays with sealing arrangement.” |
| 5 | Supply, lay, test and commissioning of HT UG, XLPE insulated, heavy duty, 11000V grade electric cable (Earthed) with aluminum conductor, 95 sqmm 3 core served with an inner sheathing of PVC tape armored with galvanized steel wire or tape and overall PVC sheathed, laid in trenches or passing through pipe,making all connections with and including provision of necessary glands, lugs, bushing etc as requiredincluding taking down old unserviceable cable complete all as specified and as directed by Engineer-in-Charge. |
| 6 | Material and labour for earthing complete with Galvanised steel earth plate electrode 60 cm x 60 cm x 6 mm thick, buried directly in ground (earth pit not less than 2.25 metres deep below normal ground level) with top edge of earth the plate not less than 1.5 metres below normal ground level, connected to plate with GI earth strip 32 x 6mm, 7.5 m long from earth point to test point and other end connected to control board / panel / equipment, laid under floors/plinths or fixed on walls or concealed in wall etc by means of bolts, nuts, check nuts and washers made out of galvanised iron or steel with provision of charcoal & common salt packed upto minimum 150 mm all around the earth plate including pouring of Bentonite powderearthing chemical not less than 20 Kgs on each earthingand protected by 40 mm bore light grade galvanised iron pipe complete allas shown in electrical plate No.3 of MES schedule Part I, 2009 withPCC pit in PCC 1:2:4 type B1 using 20 mm graded stone aggregate,MS angle iron frame of size 50mm x 50mm x 5mm, cast iron cover with locking arrangements, GI 15 mm bore medium grade pipe and CI funnel with wire mesh for watering arrangement including necessary excavation and earth work in any type of soil/strata & testing complete all as specified and as directed by Engineer-in-Charge. |
| 7 | Supply and installation of 11 KV, 630 Amps Load break switch with earth switch, aluminium bus bar complete with internal wiring, dust and vermin proof,PSLBS type panel conforms to standard IEC 62271-200, modular design outdoor type enclosure IP 55, tailor made for individual requirement metering with CCs & PTs must be provided, with cable entry from bottom of panel with suitable size of cable glands, powder coated, compact in size and weight, explosion vent must be provided on backside of panel to release accidental over pressures, space heater should be provided in the panel for humid conditions with HT HRC fuses are DIN type mounted on fuses clamps and easy to replace from front side, capacity would be such that it could handle on load tripping with rated short time with stand current 26.3 KA per sec, with 3 pole contacts made of moulded copper/brass material, moving and fixed arms made of fiber glass material, ON/OFF operating handle with push to trip button, ON/OFF mechanical indicators clearly visible, Earth switch mechanism with lock & Key, 3mm thickness duly fixed in ground with PCC foundation(1:2:4) type B1, with danger notice plate of 1.6 mm thick mild steel sheet, vitreous enamelled (white) with letters figures and conventional skull and bones in signal red colour, The complete operating mechanism parts are to be sufficiently isolated from live parts, and grounded through earth switch for the safety of the operator, the operating mechanism shall be of robust, adjustable design with padlock facility in either the \"OPEN\" and \"CLOSE\" positions, The complete operating mechanism are to be equipped with an operating handle (insulated material with anti-slip grip) and shall be designed for steady manual operation from ground level.complete all as specified and directed by engr-in-charge |
| 8 | Supply, lay, test and commissioning of LT UG, XLPE insulated, heavy duty 1100V grade electric cable (Earthed)with aluminum conductor, 120 sqmm 3.5 core served with an inner sheathing of PVC tape armored with galvanized steel wire or tape and overall PVC sheathed, laid in trenches or passing through pipe,making all connections with and including provision of necessary glands, lugs, bushing etc as requiredincluding taking down old unserviceable cable complete all as specified and as directed by Engineer-in-Charge. |
| 9 | Excavation in trenches not exceeding 1.5m wide and not exceeding 1.5m in deep for laying UG cables and getting out in soft/loose soil complete all as specified and as directed by Engineer-in-Charge |
| 10 | Returning, filling in, including, spreading, levelling, watering and well ramming in layers not exceeding 25 cm thick in any soil all as specified and as directed by Engineer-in-Charge. |
| 11 | Removing excavated material to a distance not exceeding 50 m and depositing where directed at a level not exceeding 1.5 mtr above the starting point complete all as specified and as directed by Engineer-in-Charge |
| 12 | Material and labour for Cement concrete type B-1(1:2:4) using 20 mm graded stone aggregate for PCC Complete all as specified and directed by engr-in-charge. |
| 13 | Material and labour for cutting the existing bitumen road / hard standing etc of any description of surfaces and excavation in trenches not exceeding 45cm wide and depth not less than 60cm for passing of UG cable and making good thedisturbed surface filled with excavated material and top 200mm depth with PCC 1:2:4, type B1 using 20mm graded stone etc complete all as specified and as directed by Engineer-in-Charge |
| 14 | Supply and lay DOUBLE WALLED CORRUGATED DWC HDPE pipe 110mm/95 mm bore, TELEREX 450N as per IS-16205 and including couplers and bend for cable protection laid in trenches complete all as specified and directed. |
| 15 | Supply and lay DOUBLE WALLED CORRUGATED DWC HDPE pipe 120mm/103 mm bore, TELEREX 450N as per IS-16205 and including couplers and bend for cable protection laid in trenches complete all as specified and directed. |
| 16 | Material & labour for Cable jointing kit for 11 KV grade cable for indoor termination heat shrinkable type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 50 sqmm to 95 sqmm. |
| 17 | M&L for GI tubing, light grade, 80mm bore including necessary clamps for the protection of the cable, laid in trenches/under road/path completeall as specified and directed by engr-in-charge. |
