• 제목/요약/키워드: Current Circuit Breaker

검색결과 370건 처리시간 0.021초

Feasibility Study of Superconducting Fault Current Limiter Application to Korean Power System

  • Kim, Hak-Man;Kim, Jong-Yul
    • 한국초전도ㆍ저온공학회논문지
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    • 제5권1호
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    • pp.103-106
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    • 2003
  • The short circuit current problem is one of the operational problems that need to be solved by power system engineers in Korea. It is an important issue in the Seoul metropolitan area especially because of highly meshed configuration. Currently, it is regulated by changing 154 kV system configuration from loop connection to radial system, by splitting of the bus where load balance can be achieved, and by upgrading circuit breaker rating. A development project for 154 kV/2 KA SFCL application to 154 kV transmission system after 2010 is proceeding. In this paper, a feasibility study of superconducting fault current limiter (SFCL) is carried out in Seoul metropolitan area to find out the effects of its application and feasibility. This study shows that it can reduce fault current considerably, and as it can minimize the upgrading of circuit breaker rating, the economic potential of SFCL is evaluated positively.

$SF_6$ 가스차단기의 소전류 차단성능 해석 (Analysis of Small Current Interruption Performance for $SF_6$ Gas Circuit Breaker)

  • 김홍규;송기동;정진교;오연호;박경엽
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제55권10호
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    • pp.528-533
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    • 2006
  • To analyze the small current interruption performance for the gas circuit breakers, the gas density and electric field intensity should be calculated. In this paper, the FVFLIC method is used for the gas flow analysis and the FEM for the electric field analysis. Then, the dielectric withstanding voltage is evaluated by the empirical formulation or Streamer theory. By comparing the calculated dielectric strength with the test result, it is found that both methods show good prediction capability for the small current interruption performance. Especially, when both methods predict the same interrupting performance, the prediction is in accordance with the experimental result.

신소호구조가 차단성능에 미치는 영향

  • 김길수;이승수;임기조;강성화
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 추계학술대회 논문집
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    • pp.227-227
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    • 2009
  • To prevent such accidents, molded case circuit breakers with improved short-circuit current interrupting capacity are needed. This paper is focused on understanding the interrupting capability with respect to double contact structure and puffer assisted self quenching that are based on the shape of the contact system in the current molded case circuit breaker. The new arc quenching structure for increasing the interrupting capacity of molded case circuit breakers is investigated by simulation and experiment.

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단락시험 회로의 시정수 조정에 의한 투입전류 제한법 (Limiting method of short-circuit making current by controlling the time constant of dc component)

  • 박승재;류형기;강영식;고희석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 A
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    • pp.466-468
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    • 2002
  • In order to newly define and specify the performance and the testing method of the high-voltage circuit breaker, IEC 62271-100 was published in May, 2001 and took place of IEC 60056 which had been used since 1987. This new standard intensifies the requirement and the test method of the circuit breaker and also domestic manufacturer makes progress the new product development. And, KERI also goes on the build-up project of short-circuit testing facilities for fulfilling the testing method requirements in new IEC 62271-100. This paper introduce the limiting method of short-circuit making current by controlling the time constant of dc component.

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자기회로의 위상학적 상사성을 이용한 전류제한기 구조에 관한 연구 (The Research for a Structure of Current Limiter using a Phasic Similitude of Magnetic Circuit)

  • 지근양;민경일;이수원;장봉환;문영현
    • 전기학회논문지
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    • 제58권11호
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    • pp.2128-2135
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    • 2009
  • In this paper, current limiter using a magnetic switching which is based on magnetic flux change in the case of fault is proposed. This current limiter consists of iron-core and three parts of coils. One is the primary coil connected to the power system. Another is the secondary coil wound to the opposite direction of the primary coil's winding. The other is the secondary of the secondary coil which is a movable copper plate winding and located below the secondary coil. In the normal state, the magnetic flux produced in the primary and secondary coils flows to the opposite directions each other and becomes to be canceled out. Therefore the voltages induced between the coils are zero. In the case of a fault, at the moment of a fault occurrence recognition, the switch connected to a secondary coil is opened and the secondary of the secondary coil is pulled out to the outside of the iron-core. Then, magnetic flux becomes to flow through the iron-core. Accordingly, the voltage is induced between the both ends of the primary coil and makes the current reduced. Therefore it is possible to cut off the circuit breaker easily with the proposed current limiter. This paper analyzes the current limiting effects and the detailed results are given.

비접지 분로 콘덴서 뱅크의 투입제어방식에 대한 시뮬레이션 검증 (Verification of Controlled Closing Method for Unearthed Shunt Capacitor Banks by Simulation)

  • 이우영;박경엽;정진교;김희진
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제52권9호
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    • pp.448-453
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    • 2003
  • In this paper the controlled closing algorithm of the circuit breaker for isolated capacitor banks is proposed. The characteristics of circuit breakers such as RDDS(rate of decrease of dielectric strength) and a mechanical operating tolerance should be also taken into account to locate contact touch instants around voltage zero. The analysis results on the voltages across circuit breaker terminals upon closing operation play an important roles to describe the suggested method. The simulations carried out in order to verify the performance of this method show that the closing instants obtained from the proposed method provide a good suppression effect on the closing transients for both single and back-to-back capacitor banks.

460[V]/400[A]/85[kA] 배선용 차단기의 아크런너 변형을 통한 차단성능 향상 (Improvement of Short Circuit Performance in 460[V]/400{A]/85(kA] Molded Case Circuit Breakers)

  • 이승수;허준;윤재훈;강성화;임기조
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 하계학술대회 논문집
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    • pp.394-394
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    • 2009
  • Owing to the increasing number of intelligent homes(or called Smart home), the corresponding cost is much higher. Low voltage circuit breakers are widely used in the intelligent homes to interrupt fault current rapidly and to assure the reliability of the power supply. The distribution of magnetic field induced by arc current in the contact system of molded case circuit breaker(hereafter MCCB) depends on the shape, arrangement, and kinds of material of arc runner. This paper is focused on understanding the interrupting capability, more specifically of the arc runner, based on the shape of the contact system in the current MCCB. The magnetic driving force was calculated by using the flux densities induced by the arc current, which are obtained by three-dimensional finite element method. There is a need to assure that the optimum design required to analyze the electromagnetic forces of the contact system generated by current and the flux density be present. This is paper present our computational analysis on contact system in MCCB.

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Arc Fault Circuit Interruption Design

  • Kang, C.S.
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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    • pp.384-386
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    • 2006
  • In this paper, arc current controller is designed for the interruption of arc fault current which is occurred in the low voltage network. Arc in electrical network have the characteristics of low current, high impedance and high frequency. Conventional controller does not have the arc current interrupt function. Hence, arc current controller is designed for the interruption of arc fault current.

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직류철도 급전계통의 안전성 향상을 위한 차단기 동작 최적 설정의 실험적 고찰 (An Experimental Study on Operation Setting Optimization of Circuit Breaker for Improving Safety on DC Railroad Feeder System)

  • 이재봉;정노건;김재문
    • 전기학회논문지
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    • 제65권3호
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    • pp.526-531
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    • 2016
  • This paper presents an experimental study on the optimal settings for the selected DC fault relay (50F) to improve the operating performance for the high-speed circuit breaker on DC feeding system which ensure safety within rolling stock maintenance depot. In this study, current supplied to overhead contact wire was calculated on 1 ms interval to analyze the correction values of DC fault selective relay for the operation of current supply cutout. Particularly, standards for the accurate detection of accidents between an electric railway vehicle and the electric power facilities are shown by investigating the optimal correction values for detection of fault current, and the results indicated that it takes about 213 ms for the DC fault selective relay(50F) to fully open. In the future, the correction values of DC fault selective relay suggested in this paper will be used as the reference values of protective relay for the safe operation of DC electric railroad system such as urban railway.

Analysis of Operating Characteristics of PM-Type Magnetic Circuit Breaker

  • Jun, Hee-Deuk;Woo, Kyung-Il;Kwon, Byung-Il
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • 제3B권2호
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    • pp.74-78
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    • 2003
  • This paper describes the operating characteristic analysis of the PM-type linear oscillatory actuator used as a magnetic circuit breaker for the electromagnetic field, electric circuit, and mechanical motion problems. Transient calculations are based upon a 2D finite element magnetic field solution including non-linearity of materials. Changes of the dynamic characteristics from the eddy current in the plunger are quantified from finite element analysis. A new laminated model is proposed to decrease the eddy current effect.