Aspects of the effects of distributed generation in single-line-to-earth faults

The impact of distributed generation on the protection of distribution system in single-line-to-earth faults is discussed. The emphasis lies on isolated neutral and resonant earthed medium voltage (MV) networks. The detrimental impact of DG on system protection is caused by the ability of DG to sustain voltage during the fault and even after the tripping of the feeder breaker. Particular problems may arise when automatic reclosing is applied. Dynamic simulation is an essential tool for analysis and visualization of the fast phenomena related to fault situations. The simulation tool used in this research is PSCADtrade. The results indicate that the new challenges to earth-fault protection caused by distributed generation can be solved by using rapid anti-islanding protection