CPC H02H 7/04 (2013.01) [G01R 31/62 (2020.01)] | 16 Claims |
1. A transformer short-circuit protection method, comprises:
acquiring output voltages of a plurality of output lines of at least one winding on a low-voltage side of a transformer;
computing a plurality of line voltages between each two of the plurality of output lines according to the output voltages; and
determining a short circuit when variations of the plurality of line voltages satisfy short-circuit variation characteristics, and sending a protection signal when the short circuit is determined,
wherein the short-circuit variation characteristics comprise an amplitude characteristic in which an amplitude of one of the plurality of line voltages is less than or equal to a first characteristic value within a detection window time, an amplitude of any one of other line voltages is greater than or equal to a second characteristic value within the detection window time, and the first characteristic value is less than the second characteristic value.
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