• Title, Summary, Keyword: EMTP/ATPDraw

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A Study on the Fault Discrimination and Location Algorithm in Underground Transmission Systems Using Wavelet Transform and Fuzzy Inference (지중송전계통에서 Wavelet 변환과 퍼지추론을 이용한 고장종류판별 및 고장점 추정에 관한 연구)

  • Park, Jae-Hong;Lee, Jong-Beom
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.3
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    • pp.116-122
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    • 2006
  • The underground transmission lines is continuously expanded in power systems. Therefore the fault of underground transmission lines are increased every year because of the complication of systems. However the studies dealing with fault location in the case of the underground transmission lines are rarely reported except for few papers using traveling wave method and calculating underground cable impedance. This paper describes the algorithm using fuzzy system and travelling wave method in the underground transmission line. Fuzzy inference is used for fault discrimination. To organize fuzzy algorithm, it is important to select target data reflecting various underground transmission line transient states. These data are made of voltage and average of RMS value on zero sequence current within one cycle after fault occurrence. Travelling wave based on wavelet transform is used for fault location. In this paper, a variety of underground transmission line transient states are simulated by EMTP/ATPDraw and Matlab. The input which is used to fault location algorithm are Detail 1(D1) coefficients of differential current. D1 coefficients are obtained by wavelet transform. As a result of applying the fuzzy inference and travelling wave based on wavelet transform, fault discrimination is correctly distinguished within 1/2 cycle after fault occurrence and fault location is comparatively correct.

A Study on the Optimal Position of Lightning Arrester on Joint Operation of Neutral Wire and Overhead Grounding Wire through Lightning Surge Analysis in Combined Distribution System (혼합배전계통에서 뇌과전압 해석을 통한 중성선과 가공지선 혼용 운전시 적정 피뢰기 위치에 관한 연구)

  • Jeong, Seok-San;Jang, Hwa-Youn;An, Chun-Yong;Lee, Jong-Beom
    • Proceedings of the KIEE Conference
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    • pp.535-536
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    • 2011
  • This paper studies the validity about a joint operation of neutral wire and overhead grounding wire in combined distribution systems. The overhead grounding wire and neutral wire are currently installed separately and grounded by common. However there is no any ineffectiveness or electrical problem in case of the proposed system, such system can be operated at real distribution system. Therefore this paper describes the suitability of a joint operation through lightning surge analysis on combined distribution systems and analyzes the optimal position of lightning arrester on joint operation of neutral wire and overhead grounding wire. Lightning surge analysis is carried out by EMTP/ATPDraw to obtain the overvoltage of overhead line and underground cable in various conditions such as location and current types of lightning stroke. Over voltage gained by the analysis show that the insulation strength of the joint operation case is not stable compare with the current operation case.

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