High-voltage switch PT cabinet overvoltage intelligent identification method, device and system

The invention discloses a high-voltage switch PT cabinet overvoltage intelligent identification method, device and system, and the method comprises the steps: on the premise that a zero-sequence current I is greater than a current setting value I0 or a zero-sequence voltage U is greater than a voltage setting value U0, if a low-frequency component measured value UL is greater than a low-frequency component setting value U0L, determining that the overvoltage type is frequency division ferromagnetic resonance overvoltage; if a high-frequency component measured value UH is greater than a high-frequency component setting value U0H, determining that the overvoltage type is high-frequency ferromagnetic resonance overvoltage; and otherwise, if any one of the conditions R1-R4 is met, judging the overvoltage type to be fundamental wave ferromagnetic resonance overvoltage, and otherwise, judging the overvoltage type to be non-ferromagnetic resonance overvoltage. According to the invention, the overvoltage intelligent a