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When the generator is single-phase grounded, the grounding point only flows through the capacitor current of the other two phases of the system that is electrically connected with the generator. When this current is small, the arc at the fault point can be automatically extinguished, which can greatly improve the reliability of the power supply. . When the neutral point is not grounded and the capacitor current is less than 5 amps, the single-phase grounding protection only needs to use the additional voltage on the open side of the three-phase five-column voltage transformer to give a signal. The main disadvantage of the neutral grounding method is that the internal overvoltage is higher than the phase voltage multiple.