Annex B Safety Knowledge
60
B.5.2 Arc
Self-maintained gas conduction, the majority of carriers are electrons generated by the
primary electron emission (GB/T 2900.1-2008).
B.5.3 EDM
Small short arc luminance. (GB/T 2900.1-2008)
B.5.4 Discharge
Start from the electron avalanche, the second process for complementary, continuous
motion of carriers through the original insulating medium.
B.5.5 Electrical breakdown
All or part of the dielectric medium suddenly becomes conductive due to the discharge.
(GB/T 2900.1-2008)
B.5.6 Breakdown voltage
Voltage at which breakdown occurs under specified test conditions or during operation.
(GB/T 2900.5-2008)
B.5.7 Withstand voltage
Under test conditions, voltage applied to the specimen without causing breakdown
and/or flashover. (GB/T 2900.5-2008)
B.5.8 Flashover
Breakdown occurred in gas, liquid or vacuum, partially along the solid insulation
surface. (GB/T 2900.5-2008)
Flashover is destructive discharge of gases or liquid media along the surface of the
insulation under high voltage. The discharge voltage is called flashover voltage. After the
occurrence of flashover, the voltage between the electrodes quickly drops to zero or close to
zero. The sparks or arcing in the flashover will cause local overheating or charring of the
insulating surface, damaging the surface insulation. Discharge along the insulator surface is
called flashover. The discharge inside the insulator is called breakdown.
B.5.9 Gas conductivity
Gas conductivity. (GB/T 2900.1-2008)
B.5.10 Corona
In the gas close to the conductor or at the surface of poor insulation conductor, for the
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