Question: An insulator string for 6 6 KV , has three discs, calculate the voltage distribution and string efficiency if the shunt capacitance between the joint

An insulator string for 66 KV , has three discs, calculate the voltage distribution and string efficiency if the shunt capacitance between the joint and metal work (15% of the insulator capacitance) and having a guard ring ( its capacitance 10% of insulator capacitance).
An insulator string for 6 6 KV , has three discs,

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