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jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?

/ Transmission and Distribution / By

jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?

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