Cables for 220 kV lines are invariably____________?
Correct answer: C. compressed oil or compressed gas insulated
- A. mica insulated
- B. paper insulated
- C. compressed oil or compressed gas insulated
- D. rubber insulated
- E. none of the above
Explanation
At 220 kV, conventional solid insulation becomes difficult to use economically because of high electric stress and capacitance. Compressed-oil and compressed-gas designs are used for such extra-high-voltage cables.
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