• Title/Summary/Keyword: Fault location scheme

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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 for Fault Location Scheme Using the 9-Conductor Modeling of Korean Electric Railway System (9도체 전기철도 모델링을 이용한 고장점 표정 방안 연구)

  • Lee, Han-Sang;Lee, Chang-Mu;Lee, Han-Min;Jang, Gil-Soo;Chang, Sang-Hoon
    • Proceedings of the KIEE Conference
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    • 2006.11a
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    • pp.411-413
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    • 2006
  • This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because there is a long distance, 40 km or longer, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, the catenary system must be modeled exactly to analyze fault current magnitude and fault location. In this paper, before suggestion for the novel scheme of fault location, a 9-conductor modeling technique that includes 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 suggest a powerful model for fault analysis on electric railway systems.

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Fault Locator using GPS Time-synchronized Phasor for Transmission Line (송전선로의 동기페이저를 이용한 고장점 표정장치)

  • Lee, Kyung-Min;Park, Chul-Won
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.1
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    • pp.47-52
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    • 2016
  • Fault location identification in the transmission line is an essential part of quick service restoration for maintaining a stable in power system. The application of digital schemes to protection IEDs has led to the development of digital fault locators. Normally, the impedance measurement had been used to for the location detection of transmission line faults. It is well known that the most accurate fault location scheme uses two-ended measurements. This paper deals with the complete design of a fault locator using GPS time-synchronized phasor for transmission line fault detection. The fault location algorithm uses the transmitted relaying signals from the two-ended terminal. The fault locator hardware consists of a Main Processor Unit, Analog Digital Processor Unit, Signal Interface Unit, and Power module. In this paper, sample real-time test cases using COMTRADE format of Omicron apparatus are included. We can see that the implemented fault locator identified all the test faults.

Bus-tie application scheme of 154 kV class SFCLs in Korean power systems

  • Lee, Seung-Ryul;Yoon, Jae-Young;Park, Jong-Young;Lee, Byong-Jun
    • Progress in Superconductivity and Cryogenics
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    • v.11 no.4
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    • pp.29-32
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    • 2009
  • This paper proposes the bus-tie application scheme of 154 kV SFCL (superconducting fault current limiter) in Korean power system. The reduced amount of fault current by SFCL is different by where the SFCL is installed. Therefore the inflow ratio of fault current (IRFC) is suggested to consider the effect of an SFCL's location. The proposed scheme was applied to the Korean Power System of 2010, and fault currents were calculated and analyzed with this coefficient. Simulations show that the location with high IRFC is adequate to install SFCL but more consideration of other things is required to determine the location and capacity of SFCL.

The Analysis of Protection -Characteristics and Fault-Locator Simulation on the Electrical Railway (교류전기철도 보호특성 해석 및 고장점표정 시뮬레이션)

  • 창상훈;이장무
    • Proceedings of the KSR Conference
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    • 1998.11a
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    • pp.262-269
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    • 1998
  • In case the fault occurs in AC power supply network, protective relaying system must selectively detect line-to-line/ground fault and immediately cut off the power flow into the fault location for guaranteeing the safety of people, electric vehicle and ground installation etc. It is the most important point in power system operation to minimize the fault duration by rapid trip scheme and accurate estimation of the fault location. In this paper, we analyze the load characteristics of each vehicle, perform the fault analysis of AC power supply network using AT current-ratio method. The result shows its usefulness.

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Algorithm for Detecting, Indentifying, Locating and Experience to Develop the Automate Faults Location in Radial Distribution System

  • Wattanasakpubal, Choowong;Bunyagul, Teratum
    • Journal of Electrical Engineering and Technology
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    • v.5 no.1
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    • pp.36-44
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    • 2010
  • This paper presents the design of an algorithm to detect, identify, and locate faults in radial distribution feeders of Provincial Electricity Authority (PEA). The algorithm consists of three major steps. First, the adaptive algorithm is applied to track/estimate the system electrical parameter, i.e. current phasor, voltage phasor, and impedance. Next process, the impedance rule base is used to detect and identify the type of fault. Finally, the current compensation technique and a geographic information system (GIS) are applied to evaluate a possible fault location. The paper also shows the results from field tests of the automate fault location and illustrates the effectiveness of the proposed fault location scheme.

An Exper System for Dignosis of Fault Location on Electric Power Distribution System (배전 계통에서의 고장점 진단 전문가 시스템 개발)

  • Jin, B.G.;Lee, D.S.;Lee, S.J.;Kang, S.H.;Choi, M.S.;Ahn, B.S.;Yoon, N.S.
    • Proceedings of the KIEE Conference
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    • 2001.05a
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    • pp.319-321
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    • 2001
  • When the fault occurred at distribution system, the restoration was late. There are 2 reasons The one is the error of fault location the other is multiple possible candidates of fault location. This paper presents two of new techniques for diagnosing fault regions. The proposed diagnosis scheme is capable of accurately identifying the location of fault upon its occurrence. based on the integration of information available from protective devices and measured load current change at the substation. In this paper expert system for real fault region is presented using these facts. Testing of the developed system using EMTP Simulation Model has demonstrated.

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A Pointer Forwarding Scheme for Fault-tolerant Location Management in Mobile Networks (이동망에서 결함 허용 위치 관리를 위한 포인터 포워밍 방법)

  • Lee, Kyung-Sook;Ha, Sook-Jeong;Chun, Sung-Kwang;Bae, Ihn-Han
    • The KIPS Transactions:PartC
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    • v.11C no.3
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    • pp.387-394
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    • 2004
  • One of the main challenges in personal communication services(PCS ) Is to locate many mobile terminals that nay move from place to place frequently. This kind of system operation is called location management. This task entails sophisticated signaling traffic and database queries. Several strategies have been proposed to improve the efficiency of location management. These strategies use location register databases to store the current locations of mobile terminals, and are vulnerable to failure of the location register databases. In this paper, we propose a fault-tolerant pointer forwarding scheme with distributed home location register in order to tolerate the failure of location registers. The performance of the proposed scheme is evaluated analytically by simulation, and Is compared with Biaz's bypass forwarding strategy and two-path forwarding strategy.

Application of Fault Location Method to Improve Protect-ability for Distributed Generations

  • Jang Sung-Il;Lee Duck-Su;Choi Jung-Hwan;Kang Yong-Cheol;Kang Sang-Hee;Kim Kwang-Ho;Park Yong-Up
    • Journal of Electrical Engineering and Technology
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    • v.1 no.2
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    • pp.137-144
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    • 2006
  • This paper proposes novel protection schemes for grid-connected distributed generation (DG) units using the fault location algorithm. The grid-connected DG would be influenced by abnormal distribution line conditions. Identification of the fault location for the distribution lines at the relaying point of DG helps solve the problems of the protection relays for DG. The proposed scheme first identifies fault locations using currents and voltages measured at DG and source impedance of distribution networks. Then the actual faulted feeder is identified, applying time-current characteristic curves (TCC) of overcurrent relay (OCR). The method considering the fault location and TCC of OCR might improve the performance of the conventional relays for DG. Test results show that the method prevents the superfluous operations of protection devices by discriminating the faulted feeder, whether it is a distribution line where DG is integrated or out of the line emanated from the substation to which the DGs are connected.

Modified Transmission Line Protection Scheme in the Presence of SCC

  • Naeini, Ehsan Mostaghimi;Vaseghi, Behrouz;Mahdavian, Mehdi
    • Journal of Electrical Engineering and Technology
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    • v.12 no.2
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    • pp.533-540
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    • 2017
  • Distance relay identifies the type and location of fault by measuring the transmission line impedance. However any other factors that cause miss calculating the measured impedance, makes the relay detect the fault in incorrect location or do not detect the fault at all. One of the important factors which directly changes the measured impedance by the relay is series capacitive compensation (SCC). Another factor that changes the calculated impedance by distance relay is fault resistance. This paper provides a method based on the combination of distance and differential protection. At first, faulty transmission line is detected according to the current data of buses. After that the fault location is calculated using the proposed algorithm on the transmission line. This algorithm is based on active power calculation of the buses. Fault resistance is calculated from the active powers and its effect will be deducted from calculated impedance by the algorithm. This method measures the voltage across SCC by phasor measurement units (PMUs) and transmits them to the relay location via communication channels. The transmitted signals are utilized to modify the voltage signal which is measured by the relay. Different operating modes of SCC and as well as different faults such as phase-to-phase and phase-to-ground faults are examined by simulations.