• Title, Summary, Keyword: Short line fault

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A Study on Advanced Fault Locating for Short Fault of a Double Circuit Transmission Line (병행 2회선 송전선로의 선간단락시 고장점 표정의 개선에 관한 연구)

  • Park, Yu-Yeong;Park, Chul-Won
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.30 no.1
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    • pp.28-37
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    • 2016
  • Fault locating is an important element to minimize the damage of power system. The computation error of fault locator may occur by the influence of the DC offset component during phasor extraction. In order to minimize the bad effects of DC offset component, this paper presents an improved fault location algorithm based on a DC offset removal filter for short fault in a double circuit transmission line. We have modeled a 154kV double circuit transmission line by the ATP software to demonstrate the effectiveness of the proposed fault locating algorithm. The line to line short faults were simulated and then collected simulation data was used. It can be seen that the error rate of fault locating estimation by the proposed algorithm decreases than the error rate of fault locating estimation by conventional algorithm.

A Study on the TRV(SLF) of Circuit Breakers According to Install Current Limit Reactors (345kV 고장전류 저감을 위한 한류리액터 설치시 차단기 TRV(근거리 고장시) 검토)

  • Park, H.S.;Kwak, J.S.;Ju, H.J.;Ryu, H.Y.;Han, S.O.
    • Proceedings of the KIEE Conference
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    • pp.371-373
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    • 2005
  • An enhancement for a transmission and substation equipment in power system make the system impedance to be lower. In principle, if the system impedance become low, system stability will be better, but the fault current become very higher. It is a very big problem for CB operating. As a fact of CB operating performance, high amplitude of the fault current may cause CB operation failure because of exceeding standard value in TRV. So we simulated TRV by using the EMTP. Generally there are two types of TRV in actual power system. One is short line fault, the other is bus terminal fault. In this paper, we simulated the TRv at short line fault as installed current limit reactors to reduce fault current in 345kV ultra-high voltage system. Short line fault is caused from single line fault in transmission line.

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Artificial line for short-line fault test (근거리선로고장전류 차단시험용 Artificial line)

  • Park, Seung-Jae;Rhyou, Hyeong-Kee;Kang, Young-Sik;Koh, Heui-Seog
    • Proceedings of the KIEE Conference
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    • pp.1783-1785
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    • 2001
  • With the 4-MJ synthetic testing facilities completed, KERI can perform the circuit breaker testing up to 420 kV, 50 kA ratings. The short-line fault test is one of the necessary test items which are required for the circuit breaker, and in order to perform the short-line fault test KERI(Korea Electrotechnology Institute) has used the "new artificial line" which has small dimension and is easy to generate the saw-tooth wave. This paper describes the following items of the new artificial line. -Description of 4-kinds of artificial lines and determination of the circuit parameter of artificial line. -TRV characteristics of saw-tooth waves for each circuit. -KERI's artificial line.

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Analysis on Reduction Method of Symmetrical Fault Current in a Power System with a SFCL applied into Neutral Line (전력계통의 중성선에 적용된 초전도한류기의 대칭고장전류 저감방안 분석)

  • Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.2
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    • pp.148-152
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    • 2010
  • The superconducting fault current limiter (SFCL) applied into the neural line of a power system, which can limit the unsymmetrical fault current from the single-line ground fault or the double-line ground fault, was reported to be the effective application location of the SFCL in a power system. However, the limiting operation for the symmetrical fault current like the triple line-ground fault is not effective because of properties of the balanced three-phase system. In this paper, the limiting method of the symmetrical fault current in a power system with a SFCL applied into neutral line was suggested. Through the short-circuit experiments of the three-phase fault types for the suggested method, the fault current limiting and recovery characteristics of the SFCL in the neutral line were analyzed and the effectiveness of the suggested method was described.

Bus-voltage Sag Suppressing and Fault Current Limiting Characteristics of the SFCL Due to its Application Location in a Power Distribution System

  • Kim, Jin-Seok;Lim, Sung-Hun;Kim, Jae-Chul
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1305-1309
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    • 2013
  • The application of the superconducting fault current limiter (SFCL) in a power distribution system is expected to contribute the voltage-sag suppression of the bus line as well as the fault-current reduction of the fault line. However, the application effects of the SFCL on the voltage sag of the bus line including the fault current are dependent on its application location in a power distribution system. In this paper, we investigated the fault current limiting and the voltage sag suppressing characteristics of the SFCL due to its application location such as the outgoing point of the feeder, the bus line, the neutral line and the 2nd side of the main transformer in a power distribution system, and analyzed the trace variations of the bus-voltage and fault-feeder current. The simulated power distribution system, which was composed of the universal power source, two transformers with the parallel connection and the impedance load banks connected with the 2nd side of the transformer through the power transmission lines, was constructed and the short-circuit tests for the constructed system were carried out. Through the analysis on the short-circuit tests for the simulated power distribution system with the SFCLs applied into its representative locations, the effects from the SFCL's application on the power distribution system were discussed from the viewpoints of both the suppression of the bus-voltage sag and the reduction of the fault current.

Balanced and Unbalanced Fault Analysis of Synchronous Generator (동기 발전기의 평형 및 불평형 고장해석)

  • Park, Cheol-Won;An, Jun-Yeong;Lee, Jong-Su;Lee, Sang-Seong;Sin, Myeong-Cheol
    • Proceedings of the KIEE Conference
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    • pp.402-404
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    • 2006
  • In this paper, we simulated transient-state under fault in stator windings of synchronous generator. The fault types are line to ground fault, line to line short fault, and three phase short fault. For fault analysis of generator system, the voltage equation of a synchronous machine using the two-axis theory was used. It can be used to analyze important features of faults and to develop enhanced protection methods.

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A Study on the Protection Wire Type Decision of Catenary System in the 350km/h High Speed Line (350km/h급 고속전차선로 보호선의 선종결정 기법에 관한 연구)

  • Lee, Hack-Pyo;Seo, Ki-Bum;Park, Jae-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.12
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    • pp.1818-1823
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    • 2015
  • In this paper, we analyzed the optimal configuration of protection wire that have been installed in the electric railway power supply system. Protection wires are to suppress the ground potential rise when the short circuit fault between contact wire-rail(C-F), and protect the electronics equipments(signalling and communication) that are facility the wayside. The role of protection wires must be feed back quickly the fault current to the substation when a short circuit fault occurs. In this paper, we proposed that only one line to install the protection wire. Comparing how to newly proposed and existing system, most of the performance is similar. The reason is that most of the current flowing in the protection wire near the location where the fault occurred. There is no problem even if in one line for human safe and the low impedance of the return circuit in dimension to ensure the safety of the facility during the fault. To ensure safety during an fault occurs, it is sufficient even by one line. But, In the protection wire of facilities planning it is necessary to design taking into account the potential utility.

Fault Diagnosis for Induction Motor Drive System (유도 전동기 구동 시스템의 고장진단)

  • Kim, Ho-Geun;Sul, Seung-Ki
    • Proceedings of the KIEE Conference
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    • pp.154-156
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    • 1993
  • In this paper, fault analysis using simulation method and fault diagnosis scheme are presented for induction motor drive system. Major faults such as inverter 'a' phase open fault, inverter 'a'-'b' phase short circuit fault and inverter 'a' phase ground fault are analyzed and simulated. On-line and off-line fault diagnosis systems are proposed.

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Enhanced Fault Location Algorithm for Short Faults of Transmission Line (1회선 송전선로 단락사고의 개선된 고장점 표정기법)

  • Lee, Kyung-Min;Park, Chul-Won
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.6
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    • pp.955-961
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    • 2016
  • Fault location estimation is an important element for rapid recovery of power system when fault occur in transmission line. In order to calculate line impedance, most of fault location algorithm uses by measuring relaying waveform using DFT. So if there is a calculation error due to the influence of phasor by DC offset component, due to large vibration by line impedance computation, abnormal and non-operation of fault locator can be issue. It is very important to implement the robust fault location algorithm that is not affected by DC offset component. This paper describes an enhanced fault location algorithm based on the DC offset elimination filter to minimize the effects of DC offset on a long transmission line. The proposed DC offset elimination filter has not need any erstwhile information. The phase angle delay of the proposed DC offset filter did not occurred and the gain error was not found. The enhanced fault location algorithm uses DFT filter as well as the proposed DC offset filter. The behavior of the proposed fault location algorithm using off-line simulation has been verified by data about several fault conditions generated by the ATP simulation program.

A Study on the Bypassing Device for Short-fault Current produced in Low Voltage Distributed Line (저압배전계통에서 발생한 단락전류의 Bypassing 장치에 관한 연구)

  • Youn, Y.J.;Kim, O.K.;Lee, S.H.;Han, S.O.
    • Proceedings of the KIEE Conference
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    • pp.976-978
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    • 1998
  • In this paper, we designed basic concept and structure of bypassing device which promoted the activity of low voltage line-fuse, when it perceived the too small short-fault current to activate line-fuse which located at the between secondary of pole transformer and home immediately. And we study displacement of bypass contact and electromagnetic force caused by the short-fault current by the basic experiment to understand the basic characteristic of bypassing movements.

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