• Title/Summary/Keyword: Fault distance

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The Real-Time Distance Relay Algorithm Using fault Location Estimation Information for Parallel Transmission Line (병행 2회선 송전선로에서 고장점 위치 추정정보를 이용한 실시간 거리계전 알고리즘)

  • 이재규;유석구
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.3
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    • pp.183-192
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    • 2003
  • This paper presents the real-time implemented distance relay algorithm which the fault distance is estimated with only local terminal information. When a single-phase-to-earth fault on a two-parallel transmission line occurs, the reach accuracy of distance relay is considerably affected by the unknown variables which are fault resistance, fault current at the fault point and zero- sequence current of sound line The zero-sequence current of sound line is estimated by using the zero sequence voltage which is measured by relaying location Also. the fault resistance is removed at the Process of numerical formula expansion. Lastly, the fault current through a fault point is expressed as a function of the zero-sequence current of fault line, zero-sequence current of sound line, and line, and fault distance. Therefore, the fault phase voltage can be expressed as the quadratic equation of the fault distance. The solution of this Quadratic equation is obtained by using a coefficient of the modified quadratic equation instead of using the square root solution method. After tile accurate fault distance is estimated. the mote accurate impedance is measured by using such an information.

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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    • 2006.07a
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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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Analysis of Fault Point's Distant Effect in Power Distribution System with Superconducting Fault Current Limiter (배전계통의 고장 전류 제한을 위한 초전도 한류기 적용시 고장발생 위치에 따른 영향 분석)

  • Kim, Myong-Hyon;Kim, Jin-Seok;Lim, Sung-Hun;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.9
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    • pp.44-49
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    • 2011
  • Due to increase of fault current, various superconducting fault current limiter (SFCL) are researched. We studied a power distribution system with SFCL. Along the way, we knew characteristics of fault current according to a distance from substation to fault point. Fault current is reduced by distance`s increase from substation. Also, SFCL.s effects are decreased by distance too. Therefore, we analyzed the fault current by a distance from substation to fault point when a SFCL was applied into a power distribution system. We simulated using a PSCAD/EMTDC.

A Study on the Defection of Arcing Faults in Transmission Lines and Development of Fault Distance Estimation Software using MATLAB (MATLAB을 이용한 송전선로의 아크사고 검출 및 고장거리 추정 소프트웨어 개발에 관한 연구)

  • Kim, Byeong-Cheon;Park, Nam-Ok;Kim, Dong-Su;Kim, Gil-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.51 no.4
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    • pp.163-168
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    • 2002
  • This paper present a new verb efficient numerical algorithm for arcing faults detection and fault distance estimation in transmission line. It is based on the fundamental differential equations describing the transients on a transmission line before, during and alter the fault occurrence, and on the application of the "Least Error Squares Technique"for the unknown model parameter estimation. If the arc voltage estimated is a near zero, the fault is without arc, in other words the fault is permanent fault. If the arc voltage estimated has any high value, the faust is identified as an fault, or the transient fault. In permanent faults case, fault distance estimation is necessary. This paper uses the model of the arcing fault in transmission line using ZnO arrestor and resistance to be implemented within EMTP. One purpose of this study is to build a structure for modeling of arcing fault detection and fault distance estimation algorithm using Matlab programming. In this paper, This algorithm has been designed in Graphic user interface(GUI).

Numerical Algorithm for Distance Protection and Arcing Fault Recognitior (고장거리계산과 아크고장 판별 알고리즘)

  • Radojevic, Zoran;Park, K.W.;Park, J.S.
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.163-165
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    • 2002
  • In this paper a new numerical algorithm for fault distance calculation and arcing fault recognition based on one terminal data and derived in lime domain is presented. The algorithm is derived for the case of most frequent single-phase line to ground fault. The faulted phase voltage at the fault place is modeled as a serial connection of fault resistance and arc voltage. The fault distance and arc voltage amplitude are estimated using Least Error Squares Technique. The algorithm can be applied for distance protection, intelligent autoreclosure and for fault location. The results of algorithm tested through computer simulation are given.

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A New One Terminal Numerical Algorithm for Adaptive Autoreclosure and Fault Distance Calculation (적응 자동 재폐로 및 고장거리 산정을 위한 새로운 1단자 알고리즘)

  • Zoran Radojevic;Joong-Rin Shin
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.8
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    • pp.438-445
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    • 2004
  • This paper presents a new numerical spectral domain algorithm devoted to blocking unsuccessful automatic reclosing onto permanent faults and fault distance calculation. Arc voltage amplitude and fault distance are calculated from the fundamental and third harmonics of the terminal voltages and currents phasors. From the calculated arc voltage amplitude it can be concluded if the fault is transient arcing fault or permanent arcless fault. If the fault is permanent automatic reclosure should be blocked. The algorithm can be applied for adaptive autoreclosure, distance protection, and fault location. The results of algorithm testing through computer simulation and real field record are given.

Agent-Based Distance Relaying Algorithm for Phase-to-Ground Faults (에이전트 환경에서의 1선지락 거리계전 알고리즘)

  • Hyun, Seung-Ho;Jin, Bu-Gun;Lee, Seung-Jae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.11
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    • pp.1885-1891
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    • 2007
  • This paper presents a distance relaying algorithm for phase-to-ground faults in transmission lines under Multi-Agent protection environment. In normal condition, a distance relay agent stores the latest states, e.g., voltage of source side, voltage of the opposite side and the loading conditions, etc., through communication between the agents. Once a fault occurs, the relay calculates the fault location using the knowledge about the states just before the fault happens. This stand-alone operation is to improve reliability under the fault condition at which the accuracy or time required for communication may not be guaranteed. The mathematical expression of fault location is derived through loop analysis, before hand, in the manner that both fault current from the opposite end and fault resistance are included implicitly so that their effects are minimized. The suggested algorithm is applied to a typical transmission system with two power sources on both ends to show its effectiveness.

Numerical Algorithm for Adaptive Autoreclosure and Fault Distance Calculation

  • Radojevic, Zoran;Shin, Joong-Rin
    • Proceedings of the KIEE Conference
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    • 2003.11a
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    • pp.79-81
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    • 2003
  • This paper presents development and testing of a new numerical spectral domain algorithm devoted to blocking unsuccessful automatic reclosing onto permanent faults and the fault distance calculation. The arc voltage amplitude and the fault distance are calculated from the fundamental and third harmonics of the terminal voltages and currents phasors. From the calculated arc voltage amplitude it can be concluded if the fault is transient arcing fault or permanent arcless fault. If the fault is permanent automatic reclosure should be blocked. The algorithm can be applied for adaptive autoreclosure, distance protection, and fault location. The results of algorithm testing through computer simulation are given.

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Development of Portable Cable Fault Detection System with Automatic Fault Distinction and Distance Measurement (자동 고장 판별 및 거리 측정 기능을 갖는 휴대용 케이블 고장 검출 장치 개발)

  • Kim, Jae-Jin;Jeon, Jeong-Chay
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.10
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    • pp.1774-1779
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    • 2016
  • This paper proposes a portable cable fault detection system with automatic fault distinction and distance measurement using time-frequency correlation and reference signal elimination method and automatic fault classification algorithm in order to have more accurate fault determination and location detection than conventional time domain refelectometry (TDR) system despite increased signal attenuation due to the long distance to cable fault location. The performance of the developed system method was validated via an experiment in the test field constructed for the standardized performance test of power cable fault location equipments. The performance evaluation showed that accuracy of the developed system is less than 1.34%. Also, an error of automatic fault type and location by detection of phase and peak value through elimination of the reference signal and normalization of correlation coefficient and automatic fault classification algorithm not occurred.

Design and Implementation of Fault Recorder for Transmission Line Protection (송전선로 보호용 고장기록장치의 설계 및 구현)

  • Choi, Soon-Choul;Park, Chul-Won
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.30 no.3
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    • pp.46-52
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    • 2016
  • When a fault occurs on a transmission line, it is important to identify the fault location as speedily as possible for improvement of the power supply reliability. Generally, distance to fault location is estimated by off line from the recorded data. Conventional fault recorder uses the fault data at one end. This paper deals with the design of an advanced fault recorder for enhancement accuracy of the fault distance estimation and fast detection a fault occurrence position. The major emphasis of the paper will be on the description of the hardware and software of the fault recorder. The fault locator algorithm utilizes a GPS time-synchronized the fault data at both ends. The fault data is transmitted to the other side substation through communication. The advanced fault locator includes a Power module, MPU(Main Processing Unit) module, ADPU(Analog Digital Processing Unit) module, and SIU(Signal Interface Unit) modules. The MMI firmware and software of an advanced fault recording device was implemented.