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Question

The electrostatic stress in underground cable is

A.

Same at the conductor and the sheath

B.

Minimum at the conductor and maximum at the sheath

C.

Maximum at the conductor surface and minimum at the sheath

D.

Zero at the conductor as well as sheath

Answer ( Option C)

Maximum at the conductor surface and minimum at the sheath

Solution

The electrostatic stress in a cable is not uniformly distributed. The potential gradient is inversely proportional to the distance from the centre of cable. Hence it will be maximum at the surface of the inductor and goes on decreasing unit it becomes minimum at the surface of the sheath.

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