• Title, Summary, Keyword: Short line fault

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A Study on Fault of Multifunctional Battery Storage System interconnected with Distribution System (배전시스템에 연계된 다기능 전지전력저장시스템의 사고에 관한 연구)

  • Kim, Jae-Chul;Moon, Sun-Ho;Kim, In-Taek;Kim, Eung-Sang;Chu, Dong-Wook
    • Proceedings of the KIEE Conference
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    • pp.1244-1246
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    • 1998
  • This paper present a variety fault problem brought out with the multifunctional Battery Energy Storage System [MBESS] expected to be practical in the short future interconnected to power distribution system. Multifunctional BESS model and interconnection model to power system is simply configured, the problems of protection coordination and operation is studied. A line fault in the power distribution system are discussed such as line to ground and three phase fault in order to show the impact on power utilities, demand-side and BESS-side. In order to simulate a variable transient phenomenon due to 2 the BESS interconnection operation to power distribution system, in this paper, PSCAD/EMTDC simulation tools is used.

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Analysis on Fault Current Limiting and Bus-Voltage Sag Suppressing Characteristics of a Transformer Type Superconducting Fault Current Limiter (변압기형 초전도 한류기의 고장전류 제한 및 모선전압강하 억제특성 분석)

  • Park, Jin-Seol;Kang, Dae-Seung;Lim, Sung-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.1
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    • pp.113-117
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    • 2011
  • As one of the countermeasures to solve the increase of the fault current in a power system, the superconducting fault current limiter (SFCL) has been noticed together with the development of a various types of SFCL, which has accelerated the researches to apply a SFCL into a power system. Among the developed SFCLs, the transformer type SFCL is expected to be available for adjusting the voltage and the current ratings of the SFCL. In this paper, the fault current limiting and the bus line‘s voltage sag suppressing effect by the transformer type SFCL were investigated and the case without the transformer type SFCL was compared as well. Through the analysis on the results of the short-circuit tests, the fault current limiting and the bus-line voltage suppressing characteristics of the transformer type SFCL could be confirmed to be effectively performed.

Analysis of SLF Interruption Performance of Self-Blast Circuit Breaker by Means of CFD Calculation

  • Kim, Hong-Kyu;Chong, Jin-Kyo;Lee, Se-Hee
    • Journal of Electrical Engineering and Technology
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    • v.9 no.1
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    • pp.254-258
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    • 2014
  • This paper presents the performance analysis results of a short line fault interruption of a gas circuit breaker, particularly a self-blast type breaker. Hot gas flow analysis was carried out using a CFD calculation combined with the arc model and nozzle ablation model. To evaluate the interruption performance, the index function was defined using the pressure in the heating chamber and the density above the arc region. The simulation and test results showed that the gas flow field and suitable choice of an interruption performance index can be used to predict the interruption characteristics and provide guidelines for designing self-blast breakers with a higher interruption capability.

A Fault Detecting Scheme for Short-Circuited Turn in a Permanent Magnet Synchronous Motor through a Current Harmonic Monitoring (전류 고조파 관찰을 통한 영구자석 동기전동기의 권선 단락 고장 진단 기법)

  • Kim, Kyeong-Hwa;Gu, Bon-Gwan;Jung, In-Soung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.3
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    • pp.167-178
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    • 2010
  • To diagnose a stator winding fault caused by a short-circuited turn in a permanent magnet synchronous motor (PMSM), an on-line based fault detecting scheme during motor operation is presented. The proposed scheme is based on monitoring the second-order harmonic components in q-axis current obtained through the harmonic analysis and a winding fault is detected by comparing these components with those in normal conditions. The linear interpolation method is employed to determine harmonic data in arbitrary normal operating conditions. To verify the effectiveness of the proposed fault detecting scheme, a test motor to allow inter-turn short in the stator winding has been built. The entire control system including harmonic analysis algorithm and fault detecting algorithm is implemented using DSP TMS320F28335. The proposed scheme does not require any additional hardware and can effectively detect a fault during motor operation so long as the steady-state condition is satisfied.

The Study on Countermeasures of Electromagnetic Force by Three Phase Short-Circuit Test of Underground Transmission Cable (송전케이블 삼상단락 실증시험을 통한 전자력 대책방안 연구)

  • Kang, Ji-Won;Park, Hung-Sok;Yoon, Jong-Keon;Kim, Yang-Sang;Hong, Dong-Suk;Chang, Woo-Seog
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2342-2348
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    • 2009
  • Even though underground transmission cable is an essential transmission method to supply stable power for downtown and population center, the interaction of electromagnetic force by fault current is very large comparing to overhead transmission line due to restricted installation space such as tunnel, and close consideration is required for it. This paper presents countermeasures to reduce and release the effect of electromagnetic force with rope binding and installation of spacer and describes its efficacy through three phase short-circuit test, which will be utilized as basic materials for improvement and development of cleat, hanger, etc. to reduce and release effect of electromagnetic force in the future.

Analysis of Fault Current Limiting Characteristics According to Variation of Inductances in Separated Three-phase Flux-lock Type SFCL (분리된 삼상자속구속형 전류제한기의 인덕턴스 변화에 따른 전류제한 특성 분석)

  • Doo, Seung-Gyu;Du, Ho-Ik;Kim, Min-Ju;Park, Chung-Ryul;Kim, Yong-Jin;Lee, Dong-Hyeok;Han, Byoung-Sung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.22 no.6
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    • pp.522-525
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    • 2009
  • We investigated the fault current characteristics of the separates three-phase flux-lock type superconducting fault current limiter(SFCL) according to the variation of inductances. The single-phase flux-lock type SFCL consists of two coils. The primary coil is wound in parallel to the secondary coil on an iron core. And superconductor is series connected on secondary coil. Superconductor is using the YBCO coated conductor. The separated three-phase flux-lock type SFCL consists of single-phase flux-phase type SFCL in each phase. To analyze the current limiting characteristics of a three-phase flux-lock type SFCL, the short circuit experiments were carried out fault such as the triple line-to-ground fault. The experimental result shows that fault current limiting characteristics of additive polarity winding was better than subtractive polarity winding and when the inductances of coil 2 was lower, resistances of YBCO CC was more generated.

Analysis of fault characteristics in Catenary system for protection of AC feeding system (교류 급전시스템 보호를 위한 전차선로 고장특성 분석)

  • Jung, Ho-Sung;Park, Young;Kim, Joo-Rak;Kwon, Sam-Young;Park, Hyun-June
    • Proceedings of the KIEE Conference
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    • pp.1089-1090
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    • 2006
  • This paper analyzes impedance convergence characteristics and harmonics of electric locomotives operation and fault condition. To simulate the various fault and operation condition, AT feeding system and various locomotives are modeled using PSCAD/EMTDC. Analysis shows that impedance are converged into protection area in the case of short fault between catenary and rail or catenary and feeder line but in the case of disconnection fault, impedance is rater bigger so protective relay can't detect the fault. Therefore more analysis of overload and high impedance fault caused disconnection fault is needed.

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A New Distance Relaying Algorithm Immune to Mutual Coupling Effect and Reactance Effect for 765kV Untransposed Parallel Transmission Lines (상호결합효과와 리액턴스효과를 제거한 765kV 비연가 송전선로 보호용 거리계전 알고리즘)

  • Ahn Yong-Jin;Kang Sang-Hee
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.1
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    • pp.25-30
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    • 2005
  • An accurate digital distance relaying algorithm which is immune to mutual coupling effect and reactance effect of the fault resistance and the load current for the line faults in 765kV untransposed transmission lines is proposed. The algorithm can estimate adaptively the impedance to a fault point independent of the fault resistance. To compensate the magnitude and phase of the apparent impedance, this algorithm uses the angle of an impedance deviation vector. The impedance correction algorithm for phase-to-ground fault and phase-to-phase short fault use a voltage equation at fault point to compensate the fault current at fault point. A series of tests using EMTP output data in a 765kV untransposed transmission lines have proved the accuracy and effectiveness of the proposed algorithm.

Analysis of electric characteristics for extension power supply between different grounding railway distribution system (접지방식이 상이한 철도배전계통의 연장급전을 위한 전기적 특성분석)

  • Jung, Ho-Sung;Han, Moon-Seob;Lee, Chang-Mu;Kwon, Sam-Young;Park, Hyeun-Jun
    • Proceedings of the KSR Conference
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    • pp.736-741
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    • 2005
  • This paper presents electric characteristics analysis and safe configuration for extension power supply between existent 6.6kV ungrounded distribution system and establishment and improvement 22.9kV direct grounding distribution system. For this, we model 6.6kV ungrounded and 22.9kV direct grounding distribution system of urban underground, ground region. and rural electrical, unelectrical region using PSCAD/EMTDC and analyze voltage drop, charging current, ground and short fault through simulation. To analyze electric characteristics of extension power supply, we simulate extension power supply of overhead line of 6.6kV ungrounded system and underground line of 22.9kV direct grounding system of rural electrical region and propose operation condition for safe extension power supply through result of analysis. Characteristics of voltage drop, charging current, ground and short fault appear almost similarly with electrical characteristic of direct power supply. However, because unbalance of phases may cause relay's malfunction of ungrounded system and ground fault current of direct grounding system may demage facilities of ungrounded system, we propose safe system configuration such as impedance grounding system of neutral point.

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The Design of Lumped Constant Circuit for the Simulation of A Real 22.9 kV-y Distribution Line (22.9 kV-y 실긍장 배전선로 모의를 위한 집중정수회로의 설계)

  • Yun, Chul-Ho;Jeong, Yeong-Ho;Han, Yong-Huei
    • Proceedings of the KIEE Conference
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    • pp.1186-1188
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    • 1999
  • When we perform the test related to the power distribution system such as artificial fault test, protective coordination test, distribution automation test in short length test line, Lumped Constant Circuit, a kind of variable impedance, should be attached to the test line in order to make it equivalent to a real line in length electrically. In this paper we designed the positive sequence and zero sequence Lumped Constant Circuit with optimized inductor and resister for the modification of long, 16km, distribution line, when they are attached to the short, 4km, distribution test line.

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