The method for automatic compensation and detection of earth faults in distribution network

The idea grounding neutral scheme for MV (Medium-Voltage) distribution network is that. When an instantaneous single-phase-to-earth fault occurs, the fault arc disappears automatically because of the rap id compensation. of arc suppression coil current. The power supply is continuous. When a permanent single-phase-to-earth fault occurs it can detects and trips the faulty feeder, in a short time. This idea scheme can be achieved by a TSC (Thyristor Switched Capacitors) automatic tuning arc suppression coil with a parallel resistor. This paper states the compensation principle of earth capacitance current and the detection methods - of faulty feeder. It also discuses the selection of the parallel resistor value. The simulation results based on EMTP-ATP show that this scheme is correct and effective.