Moderate
By which of the following methods string efficiency can be improved?
Correct answer: D. Any of the above
- A. Using a guard ring
- B. Grading the insulator
- C. Using long cross arm
- D. Any of the above
- E. None of the above
Explanation
A guard ring, insulator grading, and a suitably long cross-arm all make the voltage distribution across a suspension-insulator string more uniform. Therefore, each listed method can improve string efficiency.
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