고저항 사고 모델링에 관한 연구 = A Study on the High Impedance Fault Modelling

다국어 초록 (Multilingual Abstract)

High Impedance Faults (HIF) present a source of threat to utilities customers and personnel.
Arcing faults result in waste of energy and can damage property. Protection against these faults comes mainly from a moral point of view, i.e. improving safety to persons.
High Impedance Faults are difficult to detect, when the impedance at the point of fault is high enough to limit the fault current to the unprotected region of conventional overcurrent devices. Numerous detection methods have been suggested for such fault detection. However, each detection method cannot detect all electrical conditions resulting from down conductor fault. Until now, the arc models used for modeling high impedance fault were proposed. But, these are not suitable for implementing in EMTP.
This paper proposes a technique for modeling the high impedance fault in transmission line using the ZnO arrester which can be implemented within EMTP. The performance of the proposed model is tested under a variety of fault conditions on a typical 345[kV] korean transmission line system.