So there is a lot of wind is not hot, such as too much dust on the surface of the heater, PTC ceramic chip failure, voltagefailure and so on can cause the wind is not hot.
Contact failure can occur when excessive heat or a high current or voltage pulse causes the contacts to weld together, resulting in short circuits.
当过热或者高电流或电压脉冲导致触点焊接在一起时，就会发生接触故障，形成短路。
3
Introduces the constitutes of low voltage protection system of distributing transformer, analyzes the failure reason, puts forward concrete measures of improving low voltage protective reliability.