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Answer Posted / alok kumar nayak (action ispat
rating of la = line-to-line rms voltage X 1.1 X coefficient earthing = 22X1.1X0.8 = 19.36 =20
10 ka is nominal discharge current that means the surge current that flows trough ihe la after the spark over & it is expressed in crest value of spcife=ied wave (tested).
10ka < 66kv (lighting stroke is high)
5ka < 66kv(lighting stroke is low)
2.5ka > 22kv small substation
1.5ka > 22kv small trafo
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