Ground fault self-healing system of small -current grounding system

The invention provides a ground fault self-healing system suitable for a small-current grounding system, and the system comprises a data collection module and a data processing module, and the data collection module is used for collecting the electrical quantity of a measurement point in real time; the data processing module performs fault type identification according to the electrical quantity characteristics; if the fault is a single-phase earth fault, three-phase tripping of the circuit breaker is carried out; three-phase automatic reclosing is carried out, and if the fault is an instantaneous fault, the fault disappears and reclosing succeeds; if the fault is a permanent fault, reclosing fails, the circuit breaker trips off again immediately, the circuit breaker on the opposite side trips off in an accelerated mode, and the standby power supply is automatically switched on; and implementation of fault self-healing is achieved. According to the self-healing method and system, faultsection isolation and po