Grading of cables is done in order to – Electric Power Transmission and Distribution MCQ#88

Grading of cables is done in order to:

  1. Achieve uniform electrostatic stress
  2. Reduce the size of cable
  3. Reduce insulation being used
  4. All of these

Correct answer: 4. All of these

Grading of cables is defined as the process of achieving uniform electrostatic stress in the dielectric of cables.

In a single-core cable the electrostatic stress is maximum at the conductor surface and it decreases as we move towards the sheath of the cable. This unequal stress distribution in a cable has two major disadvantages:

  1. A greater thickness of insulation is required
  2. Unequal distribution might lead to the breakdown

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