The onset voltages of positive and negative coronas are
theoretically predicted for SF6 - N2 mixtures. For
positive onset, the method of calculation is based on the
condition necessary for the onscl sucamer to propagate.
For negative onset, the method of calculation is based on
the criterion developed for the formation of repetitive
negative corona pulses. The analysis is applied for rodplane
and sphere-sphere gaps. The calculated onset
voltages obtained in both positive and negative coronas
agree well with those measured values within 4 10 YO. |
