The polarity of impulse voltage and the polarity of insulator surface electric charge can affect the corona initial time of insulator, the change time - interval and the corona current.

外拖冲击电压的极性与绝缘子表面电荷极性是否相同会影响绝缘子的电晕起始时刻、由流注向先导的转变时间间隔和流注电晕电流。

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The electric current supplied to the coils in the guideway walls is constantly alternating to change the polarity of the magnetized coils.

供给导轨槽内线圈的电流交互变化着电磁线圈的极性。

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The process of dielectric breakdown in uneven electric field is analyzed and the influence of electrode polarity on gap breakdown is researched.

文中分析了在极不均匀电场下间隙的击穿过程，并用试验研究了微细加工时电极极性对间隙击穿电压的影响。

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