Proceedings of the KSR Conference (한국철도학회:학술대회논문집)
- 2004.06a
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- Pages.1274-1279
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- 2004
Fault Detection Technique in Railway High Voltage Distribution Lines using Wavelet Transform
웨이브렛 변환을 이용한 철도 고압배전선로의 고장검출기법
Abstract
This paper proposes technique to detect ground fault in railway high voltage distribution lines. Overcurrent relay technique is widely used for detecting one line ground fault that occurs most frequently in railway high voltage distribution lines. However, ground fault in distribution line is usually high impedance fault with arc. Because the fault current magnitude measured in substation is very small, the conventional overcurrent relay can't detect the high impedance ground fault. Therefore this paper proposes the advanced technique using wavelet transform. It extracts D1 component from fault signals and detects fault comparing magnitude of D1 component in each phase. To evaluate this proposed technique, we model distribution system using PSCAD/EMTDC and extract various fault data. In conclusion this technique can detect ground fault including high impedance fault regardless of fault distance, fault impedance etc.
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