• Title, Summary, Keyword: Short line fault

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Development of Parallel Arc Fault Detector Using Ripple Voltage (리플전압을 이용한 병렬아크 사고 감지기 개발)

  • Choi, Jung-Kyu;Kwak, Dong-Kurl
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.5
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    • pp.453-456
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    • 2016
  • The major causes of electrical fire in low-voltage distribution lines are classified into short-circuit fault, overload fault, electric leakage, and electric contact failure. The special principal factor of the fire is electric arc or spark accompanied with such electric faults. This paper studies the development of an electric fire prevention system with detection and alarm of that in case of parallel arc fault occurrence in low-voltage distribution lines. The proposed system is designed on algorithm sensing the instantaneous voltage drop of line voltage at arc fault occurrence. The proposed detector has characteristics of high-speed operation responsibility and superior system reliability from composition using a large number of semiconductor devices. A new sensing control method that shows the detection of parallel arc fault is sensed to ripple voltage drop through a diode bridge full-wave rectifier at electrical accident occurrence. Some experimental tests of the proposed system also confirm the practicality and validity of the analytical results.

Analysis of Fault Current Limiting Characteristics According to Variation of Fault Current level in Integrated Three-Phase Flux-Lock Type Superconducting Fault Current Limiting (사고전류 변화에 따른 일체화된 삼상자속구속형 고온초전도 사고전류제한기의 사고전류 제한 특성 분석)

  • Han, Byoung-Sung;Park, Chung-Ryul;Du, Ho-Ik;Choi, Hyo-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.39-40
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    • 2007
  • The analysis of fault current limiting characteristics according to variation of fault current level in the integrated three-phase flux-lock type superconducting fault current limiter (SFCL), which consisted of three-phase flux-lock reactor wound on an iron core with the same turn's ratio between coil 1 and coil 2 for each single phase, was performed. To analyze the current limiting characteristics of this integrated three-phase flux-lock type SFCL, the short circuit experiments was carried out the various three-phase faults such as the single line-to-ground fault, the double line-to-ground fault, the triple line-to-ground fault. From the experimental results, the fault current limiting characteristic was improved according to increase of fault current level.

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Unbalanced line fault study for inductive disturbance analysis of distribution system (배전계통 유도장해 해석을 위한 불평형 선로 고장계산)

  • Ryu, J.H.;Kim, K.J.;Rhim, C.H.;Park, H.K.;Kim, T.K.;Kim, Y.H.;Choi, J.H.
    • Proceedings of the KIEE Conference
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    • pp.154-157
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    • 2003
  • The exicting short circuit analysis calculate the current with the balance system and unbalance fault impedance. That method deal with only bus fault with the consequence that line fault study is irrational. This paper propose the line fault, shunt unbalance and series unbalance analysis method using template concept that is one of advantages for OOP(Object-Oriented Programming). This method is possible to use for calculating inductive distrubance.

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A Study on the Transient Characteristics in 765kV Untransposed Transmission Systems (765kV 비연가 송전계통 과도 특성에 관한 고찰)

  • 안용진;강상희
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.7
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    • pp.397-404
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    • 2004
  • This paper describes a study of transient characteristics in 765kV untransposed transmission lines. As the 765(kV) system can carry bulk power, some severe fault on the system nay cause large system disturbance. The large shunt capacitance and small resistance of 765kv transmission line make various difficulties for its protection. These problems including current difference between sending and receiving terminals on normal power flow, low order harmonic current component in fault current and current transformer saturation due to the long DC time constant of the circuit etc. must be investigated and solved. The analysis of transient characteristics at sending terminal has been carried out for the single phase to ground fault and 3-phase short fault, etc. The load current, charging current in normal condition and line flows, fault current, THD(Total Harmonic Distortion) of harmonics, time constants have been analysed for the 765kV untransposed transmission line systems.

Development of Prevention Apparatus for Short-Circuit Faults Using the Line Voltage Drop of Neutral Wire (중성선 선로 전압강하를 이용한 단락사고 방지용 보호장치 개발)

  • Kwak, Dong-Kurl;Kim, Jin-Hwan;Lee, Bong-Seob
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.12
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    • pp.1953-1958
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    • 2012
  • The major causes of electrical fire are classified to short circuit fault, overload fault, electric leakage and electric contact failure. The occurrence factor of the fire is electric arc or spark accompanied with such electric faults, specially short circuit faults. Earth Leakage Circuit Breaker (ELB) and Molded_case Circuit Breaker (MCCB), that is, Residual Current Protective Devices (RCDs) used on low voltage distribution lines cut off earth leakage and overload, but the RCD can not cut off electric arc or spark to be a major factor of electrical fire. As the RCDs which are applied in low voltage distribution panel are prescribed to rated breaking time about 30ms(KS C 4613), the RCDs can't perceive to the periodic electric arc or spark of more short wavelength level. To improve such problem, this paper proposes a prevention apparatus using the line voltage drop of neutral wire and some semiconductor switching devices. Some experimental tests of the proposed apparatus confirm the validity of the analytical results.

Two-Terminal Numerical Algorithm for Single-Phase Arcing Fault Detection and Fault Location Estimation Based on the Spectral Information

  • Kim, Hyun-Houng;Lee, Chan-Joo;Park, Jong-Bae;Shin, Joong-Rin;Jeong, Sang-Yun
    • Journal of Electrical Engineering and Technology
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    • v.3 no.4
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    • pp.460-467
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    • 2008
  • This paper presents a new numerical algorithm for the fault location estimation and arcing fault detection when a single-phase arcing ground fault occurs on a transmission line. The proposed algorithm derived in the spectrum domain is based on the synchronized voltage and current samples measured from the PMUs(Phasor Measurement Units) installed at both ends of the transmission lines. In this paper, the algorithm uses DFT(Discrete Fourier Transform) for estimation. The algorithm uses a short data window for real-time transmission line protection. Also, from the calculated arc voltage amplitude, a decision can be made whether the fault is permanent or transient. The proposed algorithm is tested through computer simulation to show its effectiveness.

Application of Fault Current Limiter in 22.9kV KEPCO power distribution line (22.9kV 지중선로용 한류기 한전 실계통 시범적용)

  • Kim, Min Jee;Park, Kyungwon;Ahn, Kil-Young;Kim, Young-keun
    • Proceedings of the KIEE Conference
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    • pp.1034-1035
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    • 2015
  • Watertight 25.8 kV/600 A/12.5 kA fault current limiters (FCLs) have successfully installed in five areas (Incheon, Seoul, Gyeong-gi, Daejeon, Suwon) on KEPCO power distribution line for the purpose of commercial demonstrations. The fault current limiting operation of this FCL, which includes functions of sensing, commutation, and reduction of fault currents, is perfectly completed within 1 cycle immediately after fault occurs. The performance of FCL was verified by short circuit test, impedance test, insulation test, temperature-rise test, and control test, etc at PT&T in LS industrial systems, which is the official certification institute in Korea. In 2013, and also the FCL field test was performed in order to test the protection coordination between conventional relays and FCL, on the 1.5 kA and 5.0 kA faults, which were made by connecting the Artificial Fault Generator (AFG) to the distribution line in test grid at KEPCO Power Testing Center. The next step of this project is to check the FCL conditions caused by real external environment, and acquire the various data from five regions installed with FCL. In this paper, we intend to explain the FCL specifications and performance characteristics, and check the expected effect by application of FCL to power distribution line based on the power system analysis of an application site.

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Study on Improvement of Overcurernt Relay (OCR)'s Operation Due to Application of Superconducting Fault Current Limiter (SFCL) in Power Distribution System with a Dispersed Generation (분산전원이 도입된 배전계통에 초전도한류기 적용에 따른 과전류계전기 동작향상 연구)

  • Lim, Seung-Taek;Lim, Sung-Hun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.2
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    • pp.300-304
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    • 2017
  • Due to the introduction of various types of dispersed generations (DGs) with larger capacity in a power distribution system, the short-circuit current is expected to be increased, which more requires for the effective fault current limiting methods. As one of the promising countermeasures, the superconducting fault current limiter (SFCL) has been noticed. However, the decreased fault current by SFCL affects the operation of the overcurrent relay (OCR), representative protective device in a power distribution system. In this paper, the operation of the overcurrent relay due to the application of a SFCL in a power distribution system with DG linked by its bus line was analysed through the short-circuit tests. To analyze the effect of the SFCL application in a power distribution system with DG, the experimental simulated circuits were designed and the short-circuit tests for the power distributed system assembled with the DG, the OCR and the SFCL were carried out. Through the analysis on the short-circuit tests, the application of the SFCL in a power distribution system with DG could be confirmed to be contributed to the operational improvement of overcurrent relay.

Identification of Arcing Fault and Development of An Adaptive Reclosing Technique about Arcing Ground Fault (아크지락사고에 대한 사고 판별 및 적응 재폐로 기법)

  • Kim, H.H.;Choo, S.H.;Chae, M.S.;Park, J.B.;Shin, J.R.
    • Proceedings of the KIEE Conference
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    • pp.354-356
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    • 2006
  • This paper presents a new one-terminal numerical algorithm for fault location estimation and for faults recognition. The proposed algorithm are derived for the case of most frequent single-phase line to ground fault in the time domain. The arc voltage wave shape is modeled numerically on the basis of a great number of arc voltage records obtained by transient recorder. From the calculated arc voltage amplitude it can make a decision whether the fault is permanent of transient. In this paper the algorithm uses a very short data window and enables fast fault detection and classification for real-time transmission line protection. To test the validity of the proposed algorithm the Electro-Magnetic Transient Program(EMTP/ATP) is used.

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Developement of On-Line System for Vibration Signal Analysis (진동신호 분석을 위한 On-Line 시스템 개발)

  • Kim, O.S.;Rim, S.J.;Kim, Y.S.;Lee, Y.G.;Kim, J.C.;Chung, C.S.;Chung, S.J.
    • Proceedings of the KIEE Conference
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    • pp.616-619
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    • 1995
  • This paper describes developement of on-line system for vibration signal analysis. In the power system, the main reason of transformer fault is due to a large amount of current by a short-circuit and a ground-fault. The electromagnetic force caused by fault-current deforms transformer windings and results in vibration pattern change. Therefore if the continuous on-line vibration monitoring on transformer is performed, an incipient failure can be detected. The developed system is composed of data acquisition devices, user interface program, signal processing program, diagnosis and trend analysis program, self diagnosis program and communication program.

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