IITH/CMD/ELE/NIT/2023-24/06

Amount

Sub Head-A: Electrical Works.

Sub Head-A

Supply, Installation, Testing and Commissioning of 11kV Compact Sub-Station with 630kVA CRT DRY Type Transformer

A) HT Switchgear 11kV, 630Amps 21KA for 3 Sec. SF6 insulated Non-Extensible Fixed type with Copper Busbar Compact switchgear (Type VVV+M) consisting of Three No. Fixed Motorised Vacuum Circuit Breaker having inbuilt load break switch and earth switch within SF6 insulated robotically welded non ferrite non magnetic stainless steel enclosure of thickness 2.5mm having IP 67, with series trip,self powered microprocessor based numerical 3 O/C & 1 E/F relay (IDMTL + Inst.) protection.Interconnection between HT switchgear and transformer shall be using 1Cx3x95 sq.mm Al. unarmorured XLPE Cable

a)Relay shall be self powered of Ashida/C&S Make. ( 50,50N,51,51N) with RS485 communication port. b) Protection CT shall be 100/1A 2.5VA 5P10. c) Metering CT shall be 100/1A 2.5VA Class 1.0 accuracy e) Voltage presence indicator for incoming Healthy Indications f) Mechanical Indication for Breaker & LBS ON/OFF/EARTHED. g) Standard Manometer (SF6 Gas Pressure Indicator) h) Announciation and hooter i) Operating handle All incoming modules of the RMU shall be capable for cable termination of 3C x 240 sq.mm Al XLPE Cable, incoming cable termination kits shall be in the scope of purchaser only.

B) Transformer A.1) 630 KVA 11KV/415V Dyn11 Copper Wound Cast Resin Dry Type Transformer with Off load tap links of +5% to -5% @2.5%. Class of Insulation: F, Temperature rise limits of 90 deg.C over ambient of 50 degrees. Transformer Losses:(Losses as per ECBC 2017) Max. losses at 50% loading=3340 W, Max losses at 100% loading:8820 W and impedance 4.5 %. - 1 No. A.2) Surge Arrester on HT side - 1No. A.3) WTI with Alarm and Trip Contacts - 1 No.

C) LT PANEL- 1000 A Aluminium Busbar (100% for Phase & 50% for Neutrals) Current density 1amp/sqmm B.1) INCOMER From transformer B.1.1) 1000 Amps 4P 50Hz 66KA Fixed manual EDO Type Air Circuit Breaker (ACB) with microprocessor based Ekip Dip release for overload, short circuit & Earth Fault protection.(One ACB considered as DG incomer) - 2 No. B.1.2) RYB ON OFF TRIP Indication lamps - 2 No. B.1.3) LT side metering CT 1000 A / 5A,5VA, Cl:1.0 - 2 No. B.1.4) Multifunction meter, CL-1.0 Accuracy with RS485 Port - 2 No. B.2) Outgoing Feeders B.2.1) 800 A 4P MCCB microprocessor based released for OC,SC and EF. - 4 No.

D) Outdoor Enclosure Outdoor type enclosure having construction of Galvanised Sheet Steel having 1.5mm thickness for Non-load bearing & 2 mm for Load bearing partition sheets & Door with HRCA 4 mm base frame. The Enclosure shall have IP54 degree of protection for HT & LT switchgear compartment & IP23 degree of protection for Transformer compartment. The enclosure exterior shall be Powder Coated (Colour Light Gray & D.A.Gray ). Each compartment will be provided with the door and pad locking arrangement. The Compartment illumination lamp with door operated switch shall be provided for MV & LV compartment. As per IEC 62271-202 - 1 Set

E) Interconnecting and Earthing Interconnection Between HT switchgear & Transformer using 1Cx3Rx95 Sq.mm XLPE Single Core Aluminum unarmorured Cable & Interconnection between Transformer & LT switchgear using Aluminum Busbars. Internal earthing connections by using 50X6 GI strips, Transformer Neutral shall be 50X6 CU. - 1 Set E) FEEDER DESCRIPTION at Substation side - Outgoing E.1) BUS BAR RATING - 800 E.2) CIRCUIT BREAKER RATING - 1250A E.3) ABLE DETAILS - 1RX3CX240sq.mm E.4) Power Cable Entry - Rear Bottom with cable extension box E.5) QUANTITY - 1 E.5.1)11kV, 26.3kA/1Sec, Indoor Type, Copper Busbar with Hongshang sleeve cable entry for Cable. Control Voltage for Closing / Tripping - 24VDC, Spring Charging Motor - 230VAC. Design Ambient - 40 degree. , Paint Shade : RAL 7032 (Only for front door & end cover ). Internal Arc 1 sec E.5.2) VInd Type: VInd (Floor Mounting) E.5.3) 11KV, VInd, 1250A, 26.3kA/1sec Type:VInd - 1 E.6) Single Phase Cast Resin wound type CT's for 11KV, 26.3KA for 1Sec. Isf<=10, Insulation class-E E.6.1) 100/1-1A Core1:5P10/7VA, Core 2: 1.0/7VA - 3

Sub Head-B

Supply of folliwng size 11KV grade Stranded Compact Circular Aluminium Conductor, Conductor Screen With Extruded Semi Conducting Compound, XLPE Insulated, Insulation Screening with extruded Semi Conducting Compound in combination with Copper Tape, cores laid up, innersheath of PVC tape, galvanised flat steel strip armoured and overall PVC Sheathed Cable conforming to IS 7098 / (PART-II) 1985 with latest amendments.

3C x 120 sq mm

Supply of folliwng size 1.1KV grade Stranded Compact Circular Aluminium Conductor, C, XLPE Insulated, IWrapping of PVC Tape innersheath, Flat strip armour, extruded PVC ST-2 Outer sheathed per IS 7098(Part 1) 1988

3.5C x 400 sq mm

Supply, Installlation, TC of LT Power Distribution Panel-01 Incomer: 800A FP 50KA MCCB with Microprocessor Release O/C, S/C, E/F- 1 No. Extended Rotary Handle -1 No., 800A FP Spreader Links- 1No., Auxiliary + Trip Contact Block-1No., On, Off ,Trip Indication Lamps-1Set, RYB Indication Lamps-1set, MFM Meter Cl-1 with RS485-1 No., 6A SP 10KA MCB C Curve-4 Nos, Neutral Link -1No., 800/5A Cl-1 10VA CTs - 3 Nos Outgoings: 400A FP 36KA MCCB with MP O/C, S/C, E/F- 1No., Extended Rotary Handle - 1No., 400A FP Spreader Links-1 Set

SITC of LT Power Distribution Panels-02 Incomer: 630A FP 36KA MCCB with Microprocessor Release O/C, S/C, E/F - 1No Extended Rotary Handle-1 No., 630A FP Spreader Links-1 No., Auxiliary + Trip Contact Block - 1No., On, Off ,Trip Indication Lamps-1 Set, RYB Indication Lamps-1set, MFM Meter Cl-1 with RS485 - 1No., 6A SP 10KA MCB C Curve -4 Nos, Neutral Link-1no., 630/5A Cl-1 10VA CTs-3 Nos Outgoings: 250A FP 36KA MCCB with MP O/C, S/C, E/F- 1 No., Extended Rotary Handle-1 No., 250A FP Spreader Links-1 set

Sub Head-C

supplying and making indoor cable end termination with heat shrinkable jointing kit complete with all accessories including lugs suitable for following size of 3 core, XLPE aluminium conductor cable of 11 KV grade as required :

Supplying and making straight through cable jointing with heat shrinkable jointing kit complete with all accessories including ferrules suitable for following size of 3 core, XLPE aluminium conductor cable of 11KV grade as required

Laying of one number PVC insulated and PVC sheathed / XLPE power cable of 11 KV grade of following size direct in ground including excavation, sand cushioning, protective covering and refilling the trench etc as required.

Above 120 sq. mm and upto 400 sq. mm

Laying of one number PVC insulated and PVC sheathed / XLPE power cable of 11 KV grade of following size in the existing RCC/ UME/ METAL pipe as required.

Above 120 sq. mm and upto 400 sq. mm

Supplying and making end termination with brass compression gland and aluminium lugs for following size of PVC insulated and PVC sheathed / XLPE aluminium conductor cable of 1.1 kV grade as required.

3½ X 400 sq. mm

Laying of one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 kV grade of following size direct in ground including excavation, sand cushioning, protective covering and refilling the trench etc. as required.

Above 185 sq. mm and upto 400 sq. mm

Laying of one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 kV grade of following size in the existing RCC/ HUME/ METAL pipe as required.

Above 185 sq. mm and upto 400 sq. mm

Earthing with copper earth plate 600 mm X 600 mm X 3 mm thick including accessories, and providing masonry enclosure with cover plate having locking arrangement and watering pipe of 2.7 metre long etc. with charcoal/ coke and salt as required.

Earthing with G.I. earth plate 600 mm X 600 mm X 6 mm thick including accessories, and providing masonry enclosure with cover plate having locking arrangement and watering pipe of 2.7 metre long etc. with charcoal/ coke and salt as required.

Providing and fixing earth bus of 50 mm X 5 mm copper strip on surface for connections etc. as required.

Providing and fixing 25 mm X 5 mm G.I. strip on surface or in recess for connections etc. as required.

Providing and fixing 25 mm X 5 mm copper strip in 40 mm dia G.I. pipe from earth electrode including connection with brass nut, bolt, spring, washer excavation and re-filling etc. as required.

Sub Head-B: Civil Works.

Earth work in excavation by mechanical means (Hydraulic excavator) / manual means over areas (exceeding 30cm in depth. 1.5 m in width as well as 10 sqm on plan) including disposal of excavated earth, lead upto 50m and lift upto 1.5m, disposed earth to be levelled and neatly dressed.

All Kinds of Soil

Centering and shuttering including strutting, propping etc. and removal of form work for :

Foundations, footings, bases for columns, etc.

Providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level :

1:4:8 (1 Cement : 4 coarse sand : 8 graded stone aggregate 40 mm nominal size)

Providing and laying in position specified grade of reinforced cement concrete, excluding the cost of centering, shuttering, finishing and reinforcement - All work up to plinth level :

1:1.5:3 (1 cement : 1.5 coarse sand (zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources)

Reinforcement of R.C.C. work including sraighttening, cutting, bending, placing in position and binding all complete.

Thermo-Mechanically Treated bars of grade Fe 500D or more.

Taking out existing CC interlocking paver blocks from footpath/ central verge, including removal of rubbish etc., disposal of unserviceable material to the dumping ground, for which payment shall be made separately and stacking of serviceable material within 50 metre lead as per direction of Engineer-in-Charge.

Laying old cement cocrete interlocking paver blocks of any design/ shape laid in required line, level, curvature, colour and pattern over and including 50 mm thick compacted bed of coarse sand, filling the joints with fine sand etc. all complete as per the direction of Engineer in-charge. (Old CC paver blocks shall be supplied by the department free of cost

Breaking of foundation in sub-station and construct a cable trench

AKASH ELECTRIC WORKS