• Title, Summary, Keyword: Fault location

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A study on the prediction method of the real fault distance using probability to the relay data of transmission line fault location (송전선로 거리표정치에 대한 실 고장거리의 확률적 예측방안)

  • Lee, Y.H.;Back, D.H.;Jang, S.H.
    • Proceedings of the KIEE Conference
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    • pp.10-11
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    • 2006
  • The fault location is obtained from the distance relay that detects the fault of the transmission line. In this time, transmission line crews track down the fault location and the reasons. However, because of having error at the fault location of the distance relay, there is a discordance between real and obtained fault location. As this reason, the inspection time for finding fault location can be longer. In this paper, we proposed the statistical (regression) analysis method based on each type of relay's the historical fault location data and the real fault distance data to improve the problems. With finding the regression equation based on the regression analysis, and putting the relay fault location into that equation, the real fault distance is calculated. As a result of the Prediction fault location, the inspection time of transmission line can be reduced.

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Fault Location Using Neuro-Fuzzy for the Line-to-Ground Fault in Combined Transmission Lines with Underground Power Cables (뉴로-퍼지를 이용한 혼합송전선로에서의 1선지락 고장시 고장점 추정)

  • 김경호;이종범;정영호
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.10
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    • pp.602-609
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    • 2003
  • This paper describes the fault location calculation using neuro-fuzzy systems in combined transmission lines with underground power cables. Neuro-fuzzy systems used in this paper are composed of two parts for fault section and fault location. First, neuro-fuzzy system discriminates the fault section between overhead and underground with normalized detail coefficient obtained by wavelet transform. Normalized detail coefficients of voltage and current in half cycle information are used for the inputs of neuro-fuzzy system. As the result of neuro-fuzzy system for fault section, impedance of selected fault section is calculated and it is used as the inputs of the neuro-fuzzy systems for fault location. Neuro-fuzzy systems for fault location also consist of two parts. One calculates the fault location of overhead, and the other does for underground. Fault section is completely classified and neuro-fuzzy system for fault location calculates the distance from the relaying point. Neuro-fuzzy systems proposed in this paper shows the excellent results of fault section and fault location.

Design of Fault Location System for High Voltage Underground Power Cable (지중송전선 고장점 탐색 장치 설계)

  • Lee, Jae-Duck;Ryoo, Hee-Suk;Choi, Sang-Bong;Nam, Kee-Young;Jeong, Seong-Hwan;Kim, Dae-Kyeong
    • Proceedings of the KIEE Conference
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    • pp.603-605
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    • 2006
  • To reduce inference of any power delivery failures in underground power cable, power system operators are trying to find effective way of finding fault location as soon as possible. But it is very difficult to find fault location exactly for underground power cable. We are developing fault location system for underground power cable which can detect its fault location exactly. This new system monitors current and voltage of underground power cable by using low voltage and current sensors and if there are any accidents, it records its transient signal. Fault location is calculated by analyzing recorded signal. To develop fault location system for power cable, we needed fault simulation system and we installed it physically and tested. In this rapers, we describe on describe of fault location system for underground power cable.

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A Study on Fault Location Using Wavelet in 154kV Transmission Power Cable (154kV 지중송전케이블에서 Wavelet을 이용한 Fault Location에 관한 연구)

  • Lee, Jun-Seong;Mun, Seong-Cheol;Lee, Jong-Beom
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.49 no.12
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    • pp.608-613
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    • 2000
  • This paper describes a fault location technique using wavelets in underground transmission power cable system. Estimation of fault location is performed using data smapled at two ends underground system. In the case of 50% fault of total underground transmission line, fault location is calculated using sampled single-end data in underground transmission line. Traveling wave is utilized in capturing the travel time of the transients along the monitored lines between the relay and the fault point. This traveling time information is provided by the wavelet. Simulation was performed using EMTP, ATP Draw and MATLAB. The results of fault location shown in this paper will be evaluated as an effective suggestion for fault location in real underground transmission line.

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A New Diagnosis of Actual Fault Location in Distribution Power Systems by Comparing the Current Waveform and the Amount of Interrupted Load (보호기기 동작시 전류파형과 탈락부하량을 고려한 방사상 배전계통 고장점 추정방법)

  • 최면송;이승재;이덕수;진보건;현승호
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.2
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    • pp.99-106
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    • 2003
  • In this paper, an intelligent fault location and diagnosis system is proposed. The proposed system identifies the fault location in two-step procedure. The first step identifies candidates of fault location using an fault distance calculation using an iterative method. The second step is diagnosis the actual fault location in the candidates by comparing the current waveform patterns with the expected operation of the protective devices and considering the interrupted load after the operation protective device. The simulations results in the case study demonstrates a good performance of the proposed fault location and diagnosis system.

Diagnosis of Poor Contact Fault in the Power Cable Using SSTDR (SSTDR을 이용한 케이블의 접촉 불량 고장 진단)

  • Kim, Taek-Hee;Jeon, Jeong-Chay
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.8
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    • pp.1442-1449
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    • 2016
  • This paper proposes a diagnosis to detecting poor contact fault and fault location. Electrical fire by poor contact fault of power cable occupied a large proportion in the total electrical installations. The proposed method has an object to prevent electrical fault in advance. But detecting poor contact fault is difficult to detect fault type and fault location by using conventional reflectometry due to faults generated intermittently and repeatedly on the time change. Therefore, in this paper poor contact fault and fault conditions were defined. System generating poor contact fault produced for the experimental setup. SSTDR and algorithm of reference signal elimination heighten performance detecting poor contact fault on live power cable. The diagnosis methods of signal process and analysis of reflected signal was proposed for detecting poor contact fault and fault location. The poor contact fault and location had been detected through proposed diagnosis methods. The fault location and error rate of detection were verified detecting accuracy by experiment results.

A Novel Fault Location Scheme on Korean Electric Railway System Using the 9-Conductor Representation

  • Lee, Chang-Mu;Lee, Han-Sang;Yoon, Dong-Hee;Lee, Han-Min;Song, Ji-Young;Jang, Gil-Soo;Han, Byung-Moon
    • Journal of Electrical Engineering and Technology
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    • v.5 no.2
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    • pp.220-227
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    • 2010
  • This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because of long distance, 40[km] or above, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, it must be modeled exactly to analyze the fault current magnitude and fault location. In this paper, suggesting the novel scheme of fault location, a 9-conductor modeling technique including boost wires and impedance bonds is introduced based on the characteristics of Korean AC electric railway. After obtaining a 9-conductor modeling, the railway system is constructed for computer simulation by using PSCAD/EMTDC. By case studies, we can verify superiority of a new fault location scheme and propose a powerful model for fault analysis on electric railway systems.

A Study on Fault Location Using Wavelet in 154kV Transmission Power Cable (154kV 지중송전케이블에서 Wavelet을 이용한 Fault Location에 관한 연구)

  • Lee, Jun-Sung;Lee, Jong-Beom;Moon, Sung-Chall
    • Proceedings of the KIEE Conference
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    • pp.437-439
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    • 2000
  • This paper describes a fault location technique using wavelets in underground transmission cable system Estimation of fault location is performed using data sampled at two ends of underground system. In the case of 50% fault of total underground transmission line, fault location is calculated using sampled single-end data in underground transmission line. Traveling wave is utilized in capturing the travel time of the transients along the monitored lines between the relay and the fault point. This travel time information is provided by the wavelet. Simulation was performed using EMTP. ATP Draw and MATLAB. The results of fault location shown in this paper will be evaluated as an effective suggestion for fault to location in real underground transmission line.

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Fault Location Algorithms for the Line to Ground Fault of Parallel-Circuit Line in Power Systems (전력계통 송배전선로 2회선 1선지락사고 고장거리 검출 알고리즘)

  • 최면송;이승재;강상희;이한웅
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.1
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    • pp.29-35
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    • 2003
  • This paper presents a fault location algorithm when there are parallel circuits in power system networks. In transmission networks, a fault location method using the distribution factor of fault currents is introduced and in distribution networks a method using direct 3-phase circuit analysis is developed, because the distribution networks are unbalanced. The effect of parallel circuits in fault location is studied in this paper. The effect is important for the range of protecting zones of distance relay in transmission networks and fault location in distribution networks. The result of developed fault location algorithm shows high accuracy in the simulation that using the EMTP.

Signal Processing Technology for Fault location System in Underground Power Cable (고장점 탐색 장치를 위한 신호처리 연구)

  • Lee, Jae-Duck;Ryoo, Hee-Suk;Jung, Dong-Hak;Choi, Sang-Bong;Nam, Kee-Young;Jeong, Seong-Hwan;Kim, Dae-Kyeong
    • Proceedings of the KIEE Conference
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    • pp.712-714
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    • 2005
  • With rapid growth of industry, underground power delivery systems are growing so rapidly and its capacity also growing. So if there are any accident in underground power cable, its inference is too great to count. So power system operators should find Its fault location as soon as possible and replace it But it is difficult to find its fault location for underground power cable. We are developing fault location system for underground power cable which can detect its fault location exactly. This system usually monitor underground power cable on-line But if there are an accident, it record Its transient signal and we can calculate fault location by analyzing it. To develop fault location system for power cable, we needed fault simulation system and we installed it physically and tested at various point. in this thesis, we describe on signal processing technology to detect fault location on power cable and on the result of tested fault location performance.

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