PROVN OF RING MAIN UNIT 11KV WITH CONNECTED WORKS AT MRS UNDER GE LALGARH JATTAN MIL STN

Amount

Supplying, installation and testing with proper foundation of 11 KV, 630A, 26 KA for 3 Sec SF6 insulated, one side extensible, outdoor duty 3 way Ring main unit, manual operated, in combination of 1 No. VCB modules (As a incomer) & 2 No VCB modules (As a outgoing) consisting of copper busbar in SF6 insulated Grade) stainless steel enclosure of thickness 2.5mm with manometer. Fixed on the tank. Both the incomer should be interlocked with each other. The Breaker shall have mechanical ON/OFF indicator with hand trip device and spring chagrining, spring release coil, auxiliary switch of 2 NO +2NC. The HV switchgear and control gear should be confirming to IEC-62271-100, IEC-62272-200-2003 & IEC-60694-1996. The RUM gas tank should be internal arc tested for 26 KA for 1 second with IAC-AFL classification for gas tank. The complete RMU and cable chamber should be covered by a single door to have ingress protection of minimum IP54. The RMU design should support site replaceable HT cable bushing and vacuum interrupter of VCB should be RMU manufacture’s. (a) 01 RMU should have followings microprocessor with self powered numerical relay with over current/ earth fault and short circuit protection with each VCB. (b) Protection CT shall be of Burden 2.5VA, ration 100-1A class of accuracy class 5P10 for O/C and E/F protection for each VCB-03 Nos. (c) CT ration is indicative and may vary during detailed engineering, (d) Manometer for each tank -01 No (e) Voltage passage indicator for each feeder -01 No (f) Fault passage indicator for -01 No (g) Right angle boots for all the feeder modules. (h) Basic insulation level for complete system shall be 28 KV (RMS)/75 KV (Peak)

Supply and fixing air break gang operated switch, triple pole, 11 KV (outdoor type) mechanically operated, suitable for horizontal mounting fixed type complete with 9 Nos porcelain insulators and steel frame, with operating mechanism worked from ground level with fixed contacts of phosphorous bronze and moving control of copper, for current rating upto 400 Amps including 20mm dia GI pipe heavy duty of required size with locking arrangement including Godrej (Freedom) 65mm pad lock with two keys with fuse mounts, fuse carriers and HT fuse elements having 400 amp rating suitable for HT 11 KV, 50 Hz, AC supply including necessary electric connections complete and painting of steel surfaces with 2 coats of synthetic enamel paint over a coat of red oxide primer complete all as specified and directed by Engineer-in-Charge.

Supply and fixing cable jointing kit for 120 Sqmm, 3 core, 11 KV grade cable for indoor termination, heat shrink type, joint complete with jointing material and complete all as specified and directed by Engineer-in-Charge.

Supply, laying and testing 120 Sqmm, 3 Core XLPE cable insulated, screened, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) 11000 volts grade with stranded aluminium conductor complete all as specified and directed by Engineer-in-Charge.

Excavation in trenches, not exc 1.5 m wide and n. exc 1.5 m depth; or n exc 10 Sqm on plan and n exc 1.5 m in depth for foundations of poles, struts, stays etc. or laying underground cable etc. in soft/loose soil & getting out complete all as specified and directed by Engineer-in-Charge.

Returning, filling in, including spreading, levelling, watering and well ramming in layers n.exc 25cm thick complete all as specified and directed by Engineer-in-Charge

Removal of excavated surplus soil to a distance n.exc 50m and depositing where directed at level not exceeding 1.5 m above the starting point complete all as specified and directed by Engineer-in-Charge.

S&F un-reinforced precast concrete cable cover class HVP, type-1, with peak, size 300mm x 180mm x 40mm laid flat length of cover across the length of cable complete all as specified and directed by Engineer-in-Charge.

M & L for sand cushioning with dry and clean locally available sand for underground cable 8cm before laying cable and 15 cm after laying cable and punned to 18 cm after laying of cable complete all as specified and directed by Engineer-in-Charge. Note:- Pressed thickness shall be considered for payment purpose

Supplying and fixing lightning arresters expulsion type complete with all fittings transmission class discharge capacity 65 Kilo Amps for 11KV overhead line complete all as specified and directed by Engineer -in-Charge.

Supplying and fixing cross arms, bracings, stiffeners, supports, clamps and back plates fabricated from structural steel sections conforming to Fe-290 (Gde E-165) including nuts, bolts, washers, welding, binding cold or hot, drilling holes for bolts, in any shape or size as indicated or directed complete all as specified and directed by Engr-in-Charge. Note :Unexposed surface of steel sections shall be applied one coat of red oxide primer and exposed surface shall be applied one finishing coat of aluminium over a coat of red oxide primer. cost of the same is included in the unit rate of the item.

M&L for PCC (1:3:6) type C-1 using 20mm graded stone aggregate for coping of poles / struts/ stays etc including necessary form work complete all as specified and directed by Engineer-in-Charge.

Supply, installation, testing and commissioning of maintenance free earth gird (grounding) of interconnected two earth electrode of size 85mm dia x 3 mtr long each. Metal conductor of electrode shall be Cu bounded MS strip of 50x6mm. Cu Bounding of MS rod/strip should be Min 250 microns. Earth electrode of 85mm. depth 3 mtr shall be placed in augured bore hole and embadding of interconnected strip shall be cast in high purity electrically conductive granuler material having ultra low resistive value 0.001 Ohm-m, resulting in increase of the effective surface area of the earth grid to lower the earth resistance. Conductive earth enhancing material shall be mix with cement in the ration 3:1 which should not leach chemicals into the adjacent soil or underground water channels and should be in pH neutral range. Earth enhancing material should permanently protect the encased metal components of the earthing system.. All harware like nuts, bolts and washers should be of stainless steel. electrode should withstand fault current upto 35KA for 1 second. electrodes top terminal be sealed permanently packed with conductive concrete and test link of Cu bonded MS/ Copper strip of size 50x6x200 mm shall be taken out to connect the equipment. Test certificate of NABL laboratory shall be submitted by the contractor, RCC pit cover including brazzing of all the joints upto the test point complete including dismantling and taking out old conventional earthing and accessories , strip, pipe, test point etc all as specified and directed. No precast electrodes to be used. Make: Elancrete / Vasconite/Equivalent. Note:- (a) Test certificate of earthing material from material from certified NABL laboratory shall be submitted & verified by GE. (b) Test Reports should not be more than 5 years old. (c) Test Report for fault current, rohhs, compliance resistivity value from NABL Certified/ CPRI lab is must and it has to be veified by GE.

GURDEEP SINGH AND COMPANY

MAHESH KUMAR SINGLA CONTRACTOR

SRI SAI CONSTRUCTION COMPANY

Singla Electricals

Aggarwal brothers and company