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| 1 | Taking down HT switch gear (Vacuum circuit breaker ) of capacity 400 to 800 Amps, 11 KV 250 to 450 MVA comprising of following repairs, overhauling, servicing and refixing the same after repairs/ overhauling: (A) Tripping off the breaker, lowering the breaker with raising/lowering handle and pulling out the breaker complete from the panel along with the trolley for servicing/inspection/overhauling. |
| 2 | (B) Servicing/Inspecting/checking of automatic safety shutter operation for serviceability and replacement of spares if required.(C) Servicing/Inspecting/checking of circuit spout and cicuit spout connections for RYB phases and replacement of spares if required.(D) Dismantling and checking of cross bar assembly, fixed contacts and current carrying parts of the breaker, trolley, insulated assembly and checking lamination with clamps, epoxy spout, isolator assembly etc. (E) Setting, reassembling, cleaning, adjustment of fixed contacts, main contact, arcing contacts and chamber baffle pot assembly, moving contact for proper setting of auxiliary contacts operating mechanism. (F) Servicing/Inspecting/checking of secondary sockets/busbar earthing plugs/earthing sockets and replacement of spares if required. (G) Checking, setting and adjustment of lowering and raising operation of the breaker trolley. (H) Lubrication and greasing of all moving parts of the trolley, stopper bolt for proper operating and closing of shutter gear, isolation of trolley of with vacuum interrupter assembly. |
| 3 | (G) Checking, setting and adjustment of lowering and raising operation of the breaker trolley. (H) Lubrication and greasing of all moving parts of the trolley, stopper bolt for proper operating and closing of shutter gear, isolation of trolley of with vacuum interrupter assembly. (I) The inspection of HT switch gear shall involve:-(i) Inspection of truck & hoist assembly.(ii) Inspection of tank assembly & barriers.(iii) Inspection of assembly & components of solenoid assembly.(iv) Inspection of assembly & components of dependent mechanism.(v) Inspection of assembly & components of spring box mechanism.(vi) Inspection of motor mechanism spring charge assembly (vii) Inspection of assembly of trip unit & related components.Notes: (i) The rate quoted shall be deemed to include for necessary T&P, nuts, bolts, washers, gasket, insulation tape, compound etc. to put in to the VCBs and panels in serviceable condition, testing and commissioning all as specified and as directed by the Engineer-in-Charge.(ii) Major spares like Breaker bushings, vaccum interrupter assly, busbar spout, busbar spout connections, circuit spout/circuit spout connections/buffer fixed contacts, moving contacts, tank assly/barriers, solenoid spares, /spring mechainsm/ motor mechanism, trip unit etc will be measured and paid separately under relevant items of Schedule 'A'. However the rate quoted shall be deemed to include for any other minor spares require replacement. |
| 4 | M&L for opening the HT panel of rating 11 KV, 3 phase comprising of following repairs, inspecting, overhauling and servicing/ re-fixing of the spares etc complete all as directed:(a) Dismantling the complete instrument chamber/ HV cable box/LV cable box .Decarbonising/ cleaning the complete HT 11 KV 3 phase independent bus bar, bus bar chamber of HT panel and inspecting the bus bar insulators.(b) Checking, inspecting of IDMT relays complete.(c) Checking complete electrical tripping circuit of HT panel including control wiring from secondary system tripping coil, auxiliary switch male and female housing cut out, etc. and wiring including replacement of damaged wire at places including operation on DC system, testing and commissioning complete all as directed.(d) Inspection of CTs and PTs if any. Replacing the defective CT/PTs incl accuracy in checking of the CT wiring with primary and secondary injection kit including identification to the base and connecting links to main switch including taking down unserviceable current transformer complete all as directed.(e) Inspecting of indicating lamps, rotary switches/selector switches, toggle switches etc completeNotes: (i) The rate quoted shall be deemed to include for necessary T&P, minor spares like nuts, bolts, washers, gasket, insulation tape, lugs, compound etc. to put in to the HT Panels in serviceable condition, testing and commissioning all as specified and as directed.(ii) Major spares like CTs, PTs, IDMT relays, ammeters, voltmeters, indicator lamps, control wiring, rotary/selector & toggle switches etc shall be measured and paid separately under relevant items of Schedule 'A'. However the rate quoted shall be deemed to include for any other minor spares require replacement. |
| 5 | Supply in replacement unserviceable spare parts for VCB |
| 6 | Opening/Closing push button Assembly |
| 7 | Spring charging motor and Gear Assembly |
| 8 | Limit Switch Assly including connected control wiring etc |
| 9 | TNC Switch |
| 10 | Closing Coil |
| 11 | Tripping Coil |
| 12 | Thermostat |
| 13 | Spring return latch Assembly |
| 14 | Digital ammeter with built in selector switch |
| 15 | Digital Voltmeter with built in selector switch |
| 16 | Strip heater 230V, 80 Watt |
| 17 | Shrounds for spout Insulator |
| 18 | Indicating Lamps LED Type |
| 19 | Support insulator |
| 20 | Healthiness test of whole HT 11 KV installation such as VCB by injecting artificial HT supply complete all as specified and directed. |
| 21 | S&F multi Functional electric meter incl taking down old unsv one for HT panel to measure Voltage/Amp, PF etc suitable for operating with existing CT/PT of size 96X96 mm complete all as specified and directed. |
| 22 | Supply, installation, testing and commissioning in replacement of VCB power pack with all accessories including control wiring, protections, indications all as specified, including all labour, materials, tools and testing, complete in all respects as directed. |
| 23 | Dismantling of existing 11 kV current transformer and supply, installation, testing and commissioning of new CT of same ratio, accuracy and burden with all accessories, wiring, termination, earthing, testing and integration with existing system, including all labour, materials, tools and safety measures, complete in all respects as directed. |
| 24 | Supply, laying in replacement, in trenches /ducts/fixing on pole/STR with suitable size of GI clamps made out of GI strip 32 mm x 6 mm, XLPE insulated, screened, earthed, PVC bedded, galvanised steel strip, electric power cable (heavy duty) of size 3C x 95 sqmm with aluminium conductor suitable for 11 KV (E) grade as per relevent IS including latest amendment for IS (ISI marked cable) testing, commissioning complete all as specified and directed including taking out of old burnt out cable alongwith cable covers. Note:- (a) Earth work, EHV cable cover, sand cushioning & GI pipe will be measured and paid seperately. (b) Cable insulation resistance test to be conducted at site with suitable voltage before and after laying of HT cable and reading shall be recorded jointly and test report to be submitted in triplicate to the Engineer-in-Charge. The cost of the same shall be deemed to be included in the unit rate quoted above. |
| 25 | Description all as per item no 4 above but for cable of size 3CX120 Sqmm Please Enable Macros to View BoQ information |
| 26 | Description all as per item no 4 above but for cable of size 3CX120 Sqmm Please Enable Macros to View BoQ information |
