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。
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.
间隔触发：这种类型让你去搜寻两个相同极性、被一指定时间间隔分离的连续边界。
Interval: This type lets you search for two successive edges of the same polarity that are separated by a specified interval of time.
当太阳的自转使这个波浪形间隔面扫过地球时，我们就会探测到磁场极性的突然反转。
When the sun's rotation sweeps this warped surface across the earth, we detect sudden changes in the polarity of the magnetic field.
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