Identification and Intelligent Compensation Control of Single-Phase Grounding Fault in Distribution Network

Based on the problems such as refusing compensation, mistaken compensation or oversize residual current, which is because the currently running automatic arc-suppression coils can not recognize the grounding fault. The neutral point voltage ranges in the case of instantaneous grounding, low-resistance grounding, and high-resistance grounding are derived. And the recognizable resistance range in the case of high-resistance grounding is also derived, and the validity of the derivations is verified by the simulations. According the derivations, the automatic arc-suppression coil is improved, some new functions such as grounding fault identification and intelligent compensation control are added, which effectively solved the existing problem of arc-suppression coil and improved the overall performance of arc-suppression coil. A simulated high-voltage network is built in the laboratory, and different types of single-phase grounding fault test are carried out on the improved automatic arc-suppression coil, the tests results show that the methods are satisfied and worth of further promoting.