Neutral point grounding resistor plant for electrical power system

The invention provides a neutral point grounding resistor integrated device for a power system, belonging to the field of power system distribution network technology. The integrated device comprises a grounding transformer, an isolation switch, a voltage transformer, a circuit breaker, a controller, a grounding resistor and a current transformer. When the grounding does not occur, the grounding resistor is not accessed and no current passes by the grounding resistor, thus completely solving the ageing problem caused by the temperature increment during the normal running process and greatly prolonging the service life of the equipment; and after the grounding occurs, the grounding resistor is accessed with time delay, thus avoiding the transient grounding. Compared with the prior art, the integrated device can reduce the shutdown time by about a half; after the grounding resistor is accessed, the grounding resistor is cut off after a certain time, thus preventing the grounding resistor from being burned and ensuring the safety of the equipment.