thanks, but please tell me is it for
1) rocky area or soft soil area,
2) is it Low voltage earth or High voltage earth
I need solution for my 25 KV transformer, You know the surge arrestors 3 prolong sticks of each phases, when a bird sit on them it burns and then D-fuse melts but also in my kitchen fire , sparks and appliances burn. Don't know why. Some one told me that 11 KV surge from bird's body to neutral comes in my kitchen in-search of my home earth.
It with me since 7 years, every year such incident happen 3 - 7 times a year. All electricians are stupid and fail to find any solution. Changed the phase of my kitchen. But all remain the same. Lineman say remove those surge suppressors. Which I don't want to. Problem is very severe. Hard to investigate.
MY Own finding says earth is not properly done at transformer point. This excessive fault current should go in the transformer earth not in neutral. You know three things at transformer must be earthed
1) The pole
2)Transformer body
3)Common neutral
Earth done by Wapda is simple steel rod almost 3/4 of an inch , steel rod, wire used is 8 no single core without insulation Aluminum wire which is not bonded just wrapped around the rod couple of times.
If please someone can guide me the about such problem. Its really strange for me. It always happen when birds sit and touch both phases.
Many Thanks
Omar