Arc-Suppression Method of Grounding Fault for Distribution Network Based on Controlled Voltage Source Access

In order to achieve the effect of fault arc- suppression and restore the normal operation of the system, a controlled voltage source is installed with adjustable value and phase at the beginning of a specific phase of the distribution network line. Three-phase voltage and zero-sequence voltage is continuously measured of the distribution network, and the ground fault and judge the fault phase is detected. When a fault is detected and the fault phase is determined, the output voltage of the controlled voltage source is adjusted to a specific value Ui , forcing the fault phase voltage to zero, destroying the re-ignition condition of the fault phase arc. After the personnel insolation of the fault, the controlled voltage source is taken out of the distribution network. Based on the above methods, the electrical distance between the access position of the controlled power source and the fault point is closer, and the voltage source is used to directly control the fault phase voltage, effectively avoiding the current and voltage conversion process. The effective grounding system's energy distribution is adjusted more quickly, enabling instantaneous fault arc-suppression.