A. increase
B. decrease
C. remains unaffected
D. none of the above
Answer: A. increase
Explanation:
Guard Ring equalizes the potential distribution across each disc in Suspension Insulator.
Grading Ring nullifies the effect of shunt capacitance of string insulator (suspension type insulator is also called string insulator).
Guard ring serves two purposes
1. Equalization of voltage drop across the units
2. Protects the insulator string from flash over whenever on over voltage appears between the tower structure and the power conductor
Due to these its string efficiency increases.
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