Answer / dinesh

EARTHING IS REQUIRED FOR HUMAN AS WELL AS MACHINE SAFTY
WHEN EVER THE LEAKAGE CURRENT FLOW IN THE CIRCUIT .IT PASS
THROUGH THE EARTHING CIRCUIT AND MAKE THE POTENTIONAL
DIFFRANCE ZERO .FOR THIS EARTHIN RESISTANCE IS GOOD AS
LESS AS. APROXIMAT 1 OHM. IS GOOD.

Answer / sangram

earthing is required for machine safety and very important
for human safetywhen leakage current flow should be pass by
earthing.so not danger for anything.any equpment,machine
any electrical equpment must be provied eathing.without
earthing this is not safe.

on 22.03.2015 at 17:15hrs Y phase 66kV class Power Trf-2 Current transformer has flashed over and oil came out. The failed CT has been replaced on 24.03.2015 at 13:15hrs and the Trf has been charged in presence of RT Hassan after conducting the pre-commissioning tests. On the same day at 17:00hrs the commissioned CT has again flashed over and immediately the Trf  has been isolated from power supply. It is confirmed the secondary is not opened and checked the earth integrity and is found ok. Here what would be the reason for the CT failure? 

2 Answers  

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