Question: A 3 - phase 6 9 kv transmission line having Basic Impulse Insulation Level of 3 0 0 kV is supported on steel towers and

A 3-phase 69kv transmission line having Basic Impulse Insulation Level of 300kV is supported on steel towers and protected by a circuit breaker as shown in figure 2. The ground resistance at each tower is 20 ohm where the neutral of the transmission line is solidly grounded at the transformer just ahead of the circuit-breaker. During an electric storm, one of the towers is hit by lightening of 20KA.
A. Calculate the voltage across each insulator under normal condition
B. Describe the sequence of the events during and after the lightening strike
C. Will the system survive the lightening strike?

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