Solid type cables are considered unreliable beyond 66 kV because___________?
Correct answer: D. there is a danger of breakdown of insulation due to the presence of voids
- A. insulation may melt due to higher temperature
- B. skin effect dominates on the conductor
- C. of corona loss between conductor and sheath material
- D. there is a danger of breakdown of insulation due to the presence of voids
Explanation
Voids in solid insulation can ionise under high electric stress, producing partial discharges that gradually damage the insulation and cause breakdown. This is why solid-type cables become unreliable at very high voltages.
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