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Consider a 500 KV line that has 1000 km distance in total. It is protected from over voltages by the installation of overhead ground wire.

Consider a 500 KV line that has 1000 km distance in total. It is protected from over voltages by the installation of overhead ground wire. The degree of protection provided by this scheme mainly depends upon the footing resistance of the tower. Prove this statement by assuming a mathematical example.

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