REPAIR, MAINTENACE AND PEROIODICAL SERVICE OF HT CONTROL GEAR, VCB, RMU, TRANSFORMER, UG CABLE AND ALLIED WORK FOR EXTERNAL ELECTRIC SUPPLY AT AF STN BKT

Amount

Dehydration/filtration of transformer oil by means of centrifugal filtration plant to achieve the specified dielectric strength of 30 KV at 2.5 mm gap in existing position of transformer of any capacity and transformer oil for topping up at various sub station all as directed by Engr-in-Charge( NOTE: Transformer oil used for TOP UP measured and paid separately)

Supply only transformer oil in replacement of approved quality (Dielectric strength not less than 50 KV) ISI marked for filling in transformer for topping up all as directed by Engr-in-Charge.

Taking up old U/S HT Cable of any size complete inlcuding stacking of useble PCC cover for reuse under relevent items all as specified and directed by Engr-In-Charge. NOTE : Earthwork excavation will be measure and paid separetly

Supply, laying, jointing and testing of HT XLPE PVC insulated PVC sheathed armoured heavy duty electric cable with aluminium conductor for working voltage upto 11000 Volts, graded of cross sectionsal area 95 sqmm 3 core in repair , including cable lugs for providing connections.

Excavation in trenches nexc 1.5 mtr wide and n exc 1.5 mtr in depth and getting out in soft/ loose for laying cables, erection of poles complete all as specified.

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

Removing surplus excavated soil nexc 50 mtr and depositing where directed at a level n-exc 1.5 mtr above the starting point.

M&L for Sand cushioning/sand covering for underground cable protection complete 15 cm below the cable and 8 cm above the cable all as specified.(Note:- Compected thickness shall be measured.

Supplying and laying un-reinforced precast concrete cable cover class HV type 1 flat size 300mmX180mmX40mm complete. PCC cover shall couply with IS:5820 OF 1970

Relaying un-reinforced precast concrete cable cover class HV type 1 flat size 300mmX180mmX40mm complete. NOTE : Serviceable cable covers obtained under item No 03 of BOQ shall be re-used.

Supplying, installing, testing and commissioning in replacement of gang opearted air-break, triple pole of load switch with drop out use set with 15 insulator, mounted on channels outdoor steel vertical mounting type HT 11 KV , 50 Hz o rating 200 Amps, ISI marked, mechanically operated, mounted on insulators and frame work with operating mechanism worked from ground level with adequate length of GI pipe 32 mm dia medium grade and locking arrangements including Godrej (Navtal) 65 mm pad locks with two keys, complete with fuse carriers and HT use elements havfing 10 amp rating suitable or including necessary electric connections in repairs , complete all as speciied and as directed by Enge-in-Charge

Supply and fix cable jointing kit for 11 KV (E) grade cable for indoor end termination heat shrinkable type complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 sqmm 3 core in repair, complete all as specified and directed.

Supply and fix cable jointing kit for 11 KV (E) grade cable for outdoor end termination heat shrinkable type complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 sqmm 3 core in repairs, complete all as specified and directed.

Supply and fix cable jointing kit for 11 KV (E) grade cable for straight through heat shrinkable type complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 sqmm 3 core in repairs, complete all as specified and directed.

Supply and fix cable jointing kit for 33 KV (E) grade cable for indoor end termination heat shrinkable type complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 220 sqmm 3 core in repairs complete all as specified and directed.

Supply and fix cable jointing kit for 33 KV (E) grade cable for outdoor end termination heat shrinkable type complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 220 sqmm 3 core in repairs complete all as specified and directed.

Supply and fix cable jointing kit for 33 KV (E) grade cable for straight through heat shrinkable type complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 220 sqmm 3 core in repairs complete all as specified and directed.

Testing of 33/11 KV, 01 MVA step down transformer including following tests complete all as specified and as dorected : - a) Insulation Test by 10 KV meger. b) Open Circuit/Ration test. c) Short Circuit Test. d) Magnetic Balance Test. e) Magnetization current Test. f) BDV Value of T/F Oil.

Complete testing of 33 KV VCB, Setting of CTR, Calibration of relay checking of manual, Local and remote Operation, Annunciation, Indication such as VCB ON, VCB OFF, Spring Charge and Auto Trip, Semaphore, Trip Circuit healthy etc. and Checking of tripping of VCB by primary Injection on O/C & E/F relay settings ensuring healthy protection including termination of control cable, (ferruling, lugging & connection), T/F Protection such as Buccholz alarm and trip, OTI alarm and trip, WTI alarm and Trip, PRV alarm and trip, Low Oil level alarm etc all as specified and all as directed

Complete testing of 11 KV VCB, Setting of CTR, Calibration of relay checking of manual, Local and remote Operation, Annunciation, Indication such as VCB ON, VCB OFF, Spring Charge and Auto Trip, Semaphore, Trip Circuit healthy etc. and Checking of tripping of VCB by primary Injection on O/C & E/F relay settings ensuring healthy protection including inter panel wiring, AC DC connection etc all as specified and all as directed.

Termination of control cable at 03 Nos R,Y & B phase 33/110 V PTs junction box to control panel and looping to other panel complete all as specified and all as directed. .

Termination of control cable for 33 KV isolator ON OFF indication and inter locking VCB closing circuit all as specified and all as directed.

Centrifuging of 33/11 KV, 1000 KVA of transformer Oil Up to or above 30 KV BDV value by sending centrifuging machine on site and back to our works all as specified and all as directed.

Servicing & Overhauling of 33 KV, VCBs including checking and adjustment of following: - a) Closing mechanism. b) Tripping mechanism. c) Indications and annunciation. d) Operation local remote and protection trip through relay. e) Spring charging motor, auto and manual operation.

Servicing & Overhauling of 11 KV, VCBs including checking and adjustment of following: - a) Closing mechanism. b) Tripping mechanism. c) Indications and annunciation. d) Operation local remote and protection trip through relay. e) Spring charging motor, auto and manual operation.

H C CONSTRUCTION

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