MAKING NEW BORE EARTHING OF 11 .04KV TRANSFORMER NEUTRAL POINT AT 400 KV SUBSTATION MURADNAGAR GHZ

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The work of making neutral bore earthing of 02 no. 11/.4KV LT Transformer neutral earthing is to be carried out at 400 kv sub-station muradnagar-I Boring with 150mm dia casing copper pipe to a 12 mtr depth from ground level with skilled labour including all T&P and boring apparatus for completion of work

Inserting 40x6 mm copper flat in 150 mm dia pipe B-Class ISI mark 6mtr long placed horizontal from ground up to bore level and bolting the copper flat with 150 mm long 50x6 mm copper flat conical piece and then bolting copper flat with copper pipe in such a way than copper flat remains in contact with the pipe lowering of 6.0 mtr copper pipe with conical copper flat connecting at bottom along with copper flat inside the pipe in boring of 150 mm copper pipe piece by copper socket along with 40x6 mm copper flat. Flat running inside the pipe by making 150 cm lap joints 75mm above ground level. Taking out 40x6 mm flat from the upper end of pipe by making a cut of 45mm wide up to depth of 50mmin upper portion of copper pipe and providing 1 no. cape copper socket on upper thread portion of pipe for water pouring in the pipe at regular interval filling the space between boring and copper pipe by river sand and also filling salt and coal mixture as per requirement .

Fabrication of M/s Electrodes out of 40mm dia MS round 3.0 mtr long having 150mm long conical shape

Excavation of pit of size (3.5x5x1.5) meter driven of M/s electrodes out of 40mm dia MS round 3.0 mtr long having 150mm long conical shape to bury in the earth on four corner of the pit at equal distance long deeping the top of electrodes 50 cm above the pit from ground level. Make delta with 50x6 mm copper flat by welding on all four side of electrodes and 15 cm below of top of electrodes by 85 no. u shape clamp of suitable size of copper flat connecting a piece of 3.05 mtr long 40x6mm copper flat opposite side of square welding of 40x6mm copper flat taking out from 50mm dia pipe in excavated trench of 50x50cm. and connecting this delta with main earthing

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