主要内容包括：工频暂时过电压，潜供电流，操作过电压，金属氧化物避雷器主要参数，特高压电气设备的绝缘水平等。

Paper covers temporary overvoltages, second arc current, switching overvoltage, major parameters of MOA and insulation level of UHV AC apparatus.

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如果输出电压大于预定的电压电平，则跨导放大器产生使过电压标志置位的电流。

If the output voltage is less than the predetermined voltage level, a transconductance amplifier generates a current that sets an overload flag.

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