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Basic philosophy of applying 3P tripping for uptill 132KV
switchyards & for 132KV & above 1P/3P tripping is used.
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Answer Posted / chandrasen mourya
Because most of the line used for transmission by EB are of
220 & 400kV . These lines are of lenght greater then 50 kms.
Due to which any arcing fault which is temp can trip the
line & total suhtdown. The 1p/3p trip with single shot or
multi shot AR is provided in 132kv & above.
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