Starting principle of wave recording:<br>Among them: on / off --- this channel function is on (on) / off (off)<br>3U 0 --- zero sequence voltage input by this channel<br>U-t-ui -- the difference between the current value of zero sequence voltage input to this channel and the value of one cycle wavefront<br>U-t-u-2t | -- the difference between one cycle wavefront value and two cycle wavefront value of zero sequence voltage input to this channel<br>Fixed value --- voltage zero sequence sudden change starting fixed value<br>
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