如果工频放电电压值超出范围，可对间隙进行微调。
If the working-frequency discharging voltage value exceed normal range, can faintly adjust the discharge gap.
该式能把工频电压和雷电冲击电压下空气隙的放电曲线箍在特定的范围内。
The discharging curves for power frequency voltage and lightning impulse voltage are measured and its fluctuation range caused by variation of air condition is found.
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