Starting standby transformer open-phase detection method and device and electronic equipment

The open-phase detection method comprises the following steps: measuring three-phase current and three-phase voltage of a high-voltage side of the starting standby transformer; calculating a positive sequence current, a zero sequence current, a positive sequence voltage and a zero sequence voltage based on the three-phase current and the three-phase voltage by using a symmetric component method; judging whether the amplitude of the zero-sequence current exceeds a zero-sequence current threshold value or not, if so, judging that an open-phase fault occurs, and otherwise, judging that the open-phase fault does not occur; and in response to the judgment on the occurrence of the open-phase fault, further judging the phase with the open-phase fault according to the amplitude of the zero-sequence current and the positive-sequence current and the angle relationship between the zero-sequence current and the positive-sequence voltage. By adopting the technical scheme, the open-phase fault and the open-phase grounding