The positive sequence voltage is less than 20V, and the current of any phase at the generator terminal is more than 5% in;<br>The negative sequence voltage is greater than 2.5V.<br>If any of the above conditions is met, the PT disconnection alarm signal will be sent after 10s delay, and the signal will return automatically after 10s delay after the abnormality disappears. The logic diagram of Pt disconnection criterion is shown in the figure below.<br>
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