Generator neutral point generally have which kinds of grounding, characteristics, impact - generator neutral point, the main use of not grounded, grounded by the arc-absorbing coil, through the resistance or direct grounding of the three ways. 1, the generator neutral point is not grounded: when the generator single-phase grounding, the grounding point is only the flow of the system of the other two phases of the generator and the generator has electrical Contact with the capacitive current, when this current is small, the fault point of the arc can often be automatically quenched, so you can greatly improve the reliability of power supply. When the neutral point is not grounded and capacitance current is less than 5 amps, single-phase grounding protection only need to use three-phase five-post voltage transformer open side of the other sequence of voltage to give a signal can be. Neutral point is not grounded mode of the main disadvantage is that the internal overvoltage on the phase voltage multiplier is high. 2, generator neutral point by the arcing coil grounding: when the generator capacitance current is large, generally use the neutral point by the arcing coil grounding, which is mainly considered to be grounded to a certain degree of grounding current to a certain extent when the grounding point of the arc can not be automatically extinguished. And grounding current if burned stator core is difficult to repair. Neutral point connected to the arcing coil, single-phase grounding can produce inductive current, to compensate for the capacitive current at the grounding point and make the grounding point arc automatically quenched. 3, the generator neutral point by the resistance or direct grounding: this way, although the single-phase grounding is relatively simple and internal overvoltage on the phase voltage multiplier is lower, but the single-phase grounding short-circuit current is very large, or even more than the three-phase short-circuit current, the generator may be made to the stator winding and the iron core damage, and in the case of the stator core, it is difficult to repair the stator. Core damage, but also in the event of a fault will cause short-circuit current waveform distortion, so that the relay protection is complicated.