Due to which of the following reasons the cables should not be operated too hot ?
Correct answer: E. All of the above
- A. The oil may loose its viscosity and it may start drawing off from higher levels
- B. Expansion of the oil may cause the sheath to burst
- C. Unequal expansion may create voids in the insulation which will lead to ionization
- D. The thermal instability may rise due to the rapid increase of dielectric losses with temperature
- E. All of the above
Explanation
Excessive cable temperature can reduce oil viscosity, expand the oil, create insulation voids through unequal expansion, and increase dielectric losses through thermal instability. Each listed effect is therefore a reason for limiting cable temperature.
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