Analysis on Operation Characteristics of Arc Suppression Device for Grounding Phase Voltage Actively Reduced Based on Phase Power Supply Feedback in Distribution Network

Aiming at the risk that gap arc overvoltage can not be completely suppressed by the traditional arc suppression coil and serious phase short circuit overcurrent can be caused by the fault phase transfer device in the case of developmental fault, the active step-down arc suppression method of ground fault phase based on power supply potential feedback was proposed. When a single-phase grounding fault occurs, a grounding transformer and a single-phase step-up transformer are used to extract the system line voltage opposite to the fault from the secondary side of the grounding transformer, and then the neutral point of the grounding transformer is injected through the single-phase step-up transformer. adjust the transformer ratio of the single-phase boost transformer, suppress the voltage at the fault point below the recovery intensity of the arc medium at the fault point, realize arc flameout and prevent arc reignition, so as to effectively restrain the fault arc. The current flow direction and magnitude of each phase when the device is put into operation under different grounding modes were analyzed, and the fault was verified and tested in PSCAD/EMTDC simulation environment and 10kV real distribution network laboratory. The results show that the correctness of the proposed method and analysis was verified, which provides a reliable basis for device design and selection.