高压开关柜一次触头因温度过高而造成事故时有发生，由于处于高电压状态，对该处的温度监测较为困难。

The accident happens from time to time due to high temperature of main contacts inside HV switchgear cabinet. It is difficult to monitor the temperature there under high voltage condition.

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在高阻抗状态，输出电压不改变。

In the high impedance state, output voltage is unaltered.

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利用电晕线支撑部分和屏蔽管的静电屏蔽效应，可以改善电除尘器板电流密度分布，减弱反电晕，并可得到高电压低电流的安全运行状态。

By using this kind of shielding effects, the electric current density distribution can be improved, the back-corona can be reduced and the high voltage and low current state can be obtained.

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