why we use low kv lightining arrester in line for example 9 kv using in 11kv

why we use low kv lightining arrester in line for example 9
kv using in 11kv

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why we use low kv lightining arrester in line for example 9 kv using in 11kv..

The voltage between any conductor and the earth is only
11/1.732 = 6.35 KV

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