Reason for not increasing the voltage rating of multiple shell pin type insulator

Q.  Why is the voltage rating of a multiple shell pin type insulator cannot be increased beyond a limiting value?
- Published on 23 Nov 15

a. The internal voltage distribution between shells becomes unequal
b. The leakage path resistance starts reducing
c. The disruptive critical voltage for the material of the insulator is reached
d. The puncture voltage of the material of the insulator is reached

ANSWER: The internal voltage distribution between shells becomes unequal

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