Construction of Box Type Yard with erection of different electrical equipments, earth pit and earth mat for Mega City new 33/11 KV Sub-Station at Dakhin Jagaddal under Garia Division

Amount

Erection of 4 pole for isolator with LA as WBSEDCL's Drawing No:RE/SS/39 with 8 Mtr PCC Pole( Iron materials and 8 Mtr PCC pole except nuts and bolts to be supplied by WBSEDCL)with cantilever bracket for supporting 42 kV LA (3 Nos) and 33 kV,3C,400 sq mm XLPE cable as per instruction of site engineer

Erection of Box type structure by erection of 06 nos. of Rail Pole with foundation and painting and fabrication and fixing of iron materials a the structure ( as per drawing ) , Channel , angle and flats are to be supplied by WBSEDCL for eretion of 06 nos. 33 KV CR type isolator, 03 Nos of TPGO Isolator and suuporting of the 33 kV High and Low Bus Stucture with painting as per instruction of site engineer

Fixing of 33 KV Post insulator

Erection of 1.5 Inch pipe by fixing suitable connectors including supply of pipe bus and all other materials as per instruction of site engineer

Fixing of all types of connector ( like T-connector , isolator pad , post insulator connectors, bus support, CT connector , VCB connectors ) and stringing of ACSR 200 sq mm conductor to complete all powe circuit of 33 KV Yard including supplying of connectors

Erection of 33 KV CR, HL/LL type isolator with proper adjustment and fixing of Box of handle .

Erection of 33 kV,400 Amp Centre Rocking Isolator with proper adjustment as per instruction of site engineer

Supply , fabrication and erection of 33 KV GI made CT structure with foundation bolt on existing plinth . Ref . Drawing No - PLN(D)/SS/57 and supply and fixing of FRP made CTJB box containing 24 nos of detachable link connector

Erection of Pre- fabricated 33 KV VCB structure on existing plinth with proper leveling

Supply , Fabrication and erection of 11 KV Cable support structure with modification for fixing of double incomming cable . The structure to be made of GI material

Erection of 33 KV CT OD type

Erection of 33 KV PT OD type at Box type structure with proper fixing arrangment on Base channel, and supply and fixing of PT JB box with 06 nos. detachable link

Erection of 33 KV VCB on Pre-fabricated structure

Laying of Cu control cable 4,6,8, core

Erection of 33 KV CR Panel ( 02 fd control, 02 TR contr) with cable glanding , ferruling , crimping lug along with aiding upto commissioning by dismatling relay to sent to distribution testing and reconnection of the tested relays upto commissioning as per directive of site engineer

Installation of RT CC panel with proper earthing and grouting and aiding in dismantling of transmitter, repeater and tap position indicator upto testing as per directive of site engineer

Installation of 11 KV Switch gears with Bus connection , grouting with cutting of cable entry box and as per instruction of site engineer

Excavation of Soil for making trench for laying of MS flat of mat earthing with trench dimension ( 0.450 M( width ) x0.600 M( depth)and refilling of it after laying of mat earth.

Laying of 65x8 mm MS flat at the above trench , and welding of every joints with sufficient contact area and painting of welded area by 2 coats of Black Japan ( MS flat to be supplied by WBSEDCL

Erection of earth pit by ( dimension of pit 0.3Mx0.3Mx3 M) 50 mm dia 2.5 meter long GI pipe ( TATA , best quality ) ,top of the pit to covered with masonery encloser of size 600mmx600 mm and top of the pit to be 50 mm below GL with cement brick . And top of the PIT to be covered by RCC slab ( 100 mm thickness) . The earth pit to be filled up by Earthing compound only . The earthing pipe to drilled by 30 nos of whole ( 16 mm dia) and suiatble arrangement should be there to fix riser of earth mat by welding or bolting .No material to be supplied by WBSEDCL

Erection of earthing riser for earthing of all equipments ( i.e VCB , CTs , PTRs , ) and all iron material and structure of 33 KV yard . Each equipment /structure to be connected by two nos. of riser and riser to be connected solidly to mat earth by welding and other end to be bolted and/or welded MS flat to be supplied by WBSEDCL. For PTR double run of M.S Flat 65X6 mm from seperate pit to be done and these pits to be connected from existing earth mat as per insruction of site engineer. All exposed parts of earth risers to be painted by 1 layer of red oxide ISI mark and 2 layers of ISI marked aluminum paint. Welded parts to be covered by 2 layers of Black Japan as per instruction and direction of site engineer.

Supply and laying of GI Earth bus at Control room building by 50x6 mm GI flat having clearance 6 mm from the wall including supply of Spacing insulators , nut bolts washers and earthing of 11 KV switchgears , 33 KV control panels , AC panel as per the instruction of site engineer

Fabrication and erection of structure made by MS Channel , Angle , Post isulator etc. For neutral earthing of the PTR (2 for each PTR)

Erection of short height rail pole 4 pole structure for Station Service 100 kVA,33/0.433 kV Distribution Transformer as per instruction of site engineer (one ful height rail pole to be cut in the middle for structure)

Erection of 100 kVA,33/0.433 kV Station Service Transformer on structure as per directive of site engineer

Laying and dressing of 11 kV,3C,300 sq mm XLPE Cable from PTR to Incoming VCBs and from 11 kV Outgoing ISL structure and from Box type structure to Station Service Transformer as per instruction of site engineer

Laying and dressing of 33 kV,3C,400 sq mm XLPE Cable within 160 mm HDPE pipe with supply of pipe from Box type yard to Station Service structure including connection at both ends without supply of jointing materials as per instruction fo site engineer

Making and fixing of end termination joint but without the supply of jointing kit and blocking of cable intake for all indoor ends by jute and plaster of paris as per instruction of site engineer

Laying and dressing of 1.1 kV,4C,185 sq mm XLPE Cable from Station Service Transformer to A.C D.B in excavated cable trenches as per instruction of site engineer

Installation of 30V,100 AH Battery set along with initial charging

Installation of 30V,35 A automatic float cum boost battery charger with suitable connection with DCDB as per instruction of site engineer

Supply and installation of ACDB with earthing by 25X3 mm GI Flat at 2 points on body and connection with separate earth pit

Supply and installation of DCDB with changeover facility

Painting of the entire structure for 33 kV Box type switchyard, 33 kV Incoming and Outgoing Gantry fittings (channel,angle and flat) with rail poles firstly by removing of rust (if any) then coating with one layer of red oxide ISI mark followed by 2 layers of ISI marked aluminum paint as per direction of the site engineer. The PCC Poles of the gantry also to be painted 2 coats of ISI paint (colour-blue)

CHAKRABORTY ENTERPRISE

ANKITA ELECTRICALS

Ms GHOSH ELECTRICALS