jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?
Correct answer: D. 30 kV (maximum value)/cm
- A. 6.6 kV (r.m.s. value)/cm
- B. 11 kV (r.m.s. value)/cm
- C. 22 kV (maximum value)/cm
- D. 30 kV (maximum value)/cm
Explanation
Corona begins when the electric stress at the conductor surface reaches roughly 30 kV/cm maximum value in air. The other values either use the wrong magnitude or specify an unsuitable RMS basis.
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