Question: Question 2 A three - phase 6 9 kV transmission line having a basic insulation level of 3 0 0 kV is supported on steel

Question

2

A three

-

phase

69

kV transmission line having a basic insulation level of

300

kV is supported on steel towers and protected by a circuit breaker. The line transformer is just behind the circuit breaker as shown below. The ground resistance at each tower is

25

whereas the neutral of the transmission line is solidly grounded at the transformer.

.

Calculate the voltage across each insulator string under normal conditions.b

.

Calculate the voltage between the tower and the ground when lightning strikes the tower.

.

What is the maximum earthing resistance required to avoid a flashover on the insulators?

Question 2 A three - phase 6 9 kV transmission

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