Real-time detection method and system for one-point grounding of generator terminal PT loop

The invention provides a generator terminal PT loop one-point grounding real-time detection method and system, and the method comprises the steps: adding a 20Hz low-frequency square-wave power supply to a generator, and enabling the 20Hz low-frequency square-wave power supply to be coupled to a generator terminal PT secondary side based on a grounding transformer or a grounding arc suppression coil of a neutral point of the generator; according to the parameters of the grounding transformer or the grounding arc suppression coil and the amplitude of the power supply, calculating a target phase voltage and a target open delta voltage in a PT phase voltage loop; detecting the actual three-phase voltage of the generator end and the actual open-delta voltage in the open-delta loop; and comparing the actual three-phase phase voltage with the target phase voltage, comparing the actual opening triangular voltage with the target opening triangular voltage, and judging the condition of one-point grounding of the genera