• Title/Summary/Keyword: Main circuit breaker

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A Development of Intelligent Controller for Phase Control in Main Circuit Breaker (주회로차단기 투입전원 위상제어를 위한 지능형 제어기 개발)

  • Oh, Yong-Kuk;Kim, Jae-Won;Ryu, Joon-Hyoung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.11
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    • pp.755-761
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    • 2017
  • In railways powered by AC power, the main circuit breaker (MCB) is used for supplying the electric power to the catenary of the vehicle. Generally, the main circuit breaker is located between the pantograph and the main transformer, and the phase of the power applied to the vehicle changes according to the operation timing of the main circuit breaker. The operation of the main circuit breaker should be actively controlled according to the phase of the power source, since the phase of the power causes unintended transient states in the vehicle's electrical system in the form of an inrush current and surge voltage. However, the MCB has a delay time when it operates which is not constant. Therefore, an intelligent controller is needed to predict the operation delay time and control the opening and closing of the MCB.

Transient Characteristics by Transformer %Impedance at the time of Opening the Main Circuit Breaker on the Electric Railway Vehicle (전기철도차량 주변압기의 %임피던스에 따른 차단기 개폐시 과도특성 분석)

  • Chang, Sang-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.5
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    • pp.719-725
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    • 2014
  • Transient of Electric railway vehicle occurs when change to another state. The duration of the transient phenomenon only takes a few second. During this time is considered, the present of short circuit current and the normal state, the energy is present in the form of a magnetic field. Recognized by the vibration of the transient voltage or transient current at witch energy is present in the field. This paper is presented the result of transient characteristics by transformer % impedance at the time of opening and closing of the main circuit Breaker on the electric railway vehicle.

IGBT DC Circuit Breaker with Paralleled MOV for 1,800V DC Railway Applications (직류 철도용 MOV 병렬연결 1,800V급 IGBT 직류 고속차단기 연구)

  • Han, Moonseob;Lee, Chang-Mu;Kim, Ju-Rak;Chang, Sang-Hoon;Kim, In-Dong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.12
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    • pp.2109-2112
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    • 2016
  • The rate of rise of the fault current in DC grids is very high compared to AC grids because of the low line impedance of DC lines. In AC grids the arc of the circuit breaker under current interruption is extinguished by the zero current crossing which is provided naturally by the system. In DC grids the zero current crossing must be provided by the circuit breaker itself. Unlike AC girds, the magnetic energy of DC grids is stored in the system inductance. The DC circuit breaker must dissipate the stored energy. In addition the DC breaker must withstand the residual overvoltage after the current interruption. The main contents of this paper are to ${\cdot}$ Explain the theoretical background for the design of DC circuit breaker. ${\cdot}$ Develop the simulation model in PSIM of the real scaled DC circuit breaker for 1,800V DC railway. ${\cdot}$ Suggest design guidelines for the DC circuit breaker based on the experimental work, simulations and design process.

Design requirements for Generator Circuit Breaker (원자력발전소의 발전기차단기 설계요건 검토)

  • Chi, Mun-Goo;Han, Sung-Heum
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.371-373
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    • 2001
  • Main functions of Generator Circuit Breaker(GCB) is cut the generator off from the main transformers and the aux. transformers when plant trip or startup. In this paper, the design requirements For GCB of nuclear power plant is examined. NRC presented the area of review, acceptance criteria and review procedures of GCB in the SRP(Standard Review Plan). In Korea, APR1400 adapted the GCB in main power system.

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A Study on Estimation of Interrupting capability on Molded Case Circuit Breaker including Current Limiting Unit (2중 한류 구조를 갖는 배선용 차단기의 차단성능 평가 연구)

  • Kim, Yong-Gi;Song, Jung-Chun;Seo, Jung-Min
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.144-146
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    • 2002
  • The latest development flow of MCCB(Molded Case Circuit Breaker) is largely separated from which are high capability of interrupting compact of size and multi-ability in functions. As follow of development of industrial system. MCCB which are including communication function and having a ultimate interrupting capability is required in electrical system. to attain an effective limitation of the peak let-through current and the let-through energy, the arc has to move rapidly off the contacts and has to increase the arc voltage which mainly effect to interrupt. In this paper. we made high performance circuit breaker which including current limiting unit which is attached to the main which is simulated by CAE tool that are repulsion force and mechanical dynamics after that we tested and finally selected optimized for circuit breaker.

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Breaking test of UHV circuit breaker by ANSI/IEEE standard (ANSI/IEEE를 적용한 초고압 차단기의 차단시험)

  • Park, Seung-Jae;Rhyou, Hyeong-Kee;Kang, Young-Sik;Koh, Heui-Seog
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.467-469
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    • 2003
  • IEC(International Electrotechnical Commission) 62271-100 has been adopted for the design test of circuit breaker which is used as the main protecting device of power system. But, it is also necessary to separately receive the testing certificate in accordance with ANSI/IEEE standard for getting into the american market. Up to now, several domestic companies have completed the ANSI/IEEE testing in medium circuit breaker of distribution system, but they recently started the ANSI/IEEE testing in ultra high-voltage class of transmission and substation system. This paper introduces the testing techniques and its results for the making and breaking performance of 145kV, 40kA $SF_6$ gas circuit breaker which was firstly performed in KERI(Korea Electrotechnology Institute) by the ANSI/IEEE standard.

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A Development of Software about Short-circuit Calculation and Protective-coordination (고장계산 및 보호협조 판정 소프트웨어 개발)

  • Park, S.C.;Choe, J.H.;Seo, J.M.
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.159-162
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    • 2002
  • A software, called touch-one, is developed about the determination of short-circuit values and protective co-ordination in power system. The used solution algorithm reviewed intensively, and the protective co-ordination determination technique presented by using the circuit-breaker's current-limitation characteristic. The protective coordination concerns the behaviour of two devices placed in series in an electrical network, with a short-circuit downstream circuit-breaker. It has two basic principles: First, discrimination which is an increasing requirement of low voltage electrical distribution systems. Second, which is less well known: cascading, which consists of installing a device, whose breaking capacity is less than the three-phase short-circuit current at its terminals and helped by main circuit-breaker. With this software, we can construct a electric-power system which is reliable and economic according to user's purpose.

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The Protective Co-ordination between Low-Voltage Circuit-Breaker (저압차단기기의 보호협조)

  • Park, S.C.;Oh, J.S.;Lee, B.W.;Ryu, M.J.;Seo, J.M.
    • Proceedings of the KIEE Conference
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    • 2001.11b
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    • pp.340-343
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    • 2001
  • In an electrical network, electrical power are transmitted by a various of protection, isolation and control electric circuit devices. This thesis deals with the protection function between circuit-breakers. The protective coordination concerns the behaviour of two devices placed in series in an electrical network, with a short-circuit downstream circuit-breaker. It has two basic principles: First, discrimination which is an increasing requirement of low voltage electrical distribution systems. Second, which is less well known: cascading, which consists of installing a device, whose breaking capacity is less than the three-phase short-circuit current at its terminals and helped by main circuit-breaker. The important advantage of cascading is to be able to install at a branch circuit-breaker of a lesser performance without endangering the safety of the installation for more economical usage. To determine and guarantee co-ordination between two circuit breakers, it is necessary to carry out a theoretical approach, first, and then confirm the results by means of standard tests. This is illustrated in appendix A of IEC 947-2.

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Development on the fiber-reinforced materials for low-voltage circuit breakers(I) (저압 배선용 차단기용 섬유강화 복합재료 개발(I))

  • Lee, Chang-R.;Song, Tae-H.;Kim, Jin-S.;Kim, Duck-J.;Lee, Doo-H.;Lee, Kwan-H.
    • Proceedings of the KIEE Conference
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    • 2002.11a
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    • pp.127-129
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    • 2002
  • A new type of fiber-reinforced polymeric materials for the main body and the arc chamber of the low-voltage circuit breakers was developed. The tensile and the flectional strength of the three kinds of thermoplastic resins for the cover of MCCBs(Molded case circuit breakers) increase much higher than those made of BMC that has been used. In a high current-breaking test, an experimental MCCB with the new insulating material showed no-cracks on the bodies.

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Parametric Study and Optimized Thermal Design of a High-Voltage Vacuum Circuit Breaker (고압진공차단기의 정격전류상승을 위한 GAE해석)

  • Ahn, Heui-Sub;Lee, Jong-Chul;Choi, Jong-Ung;Oh, Il-Sung
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.39-42
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    • 2002
  • In this study, the computational heat transfer of the high-voltage vacuum circuit breaker was investigated. Higher normal current-ratings and stabilized thermal characteristics become more important in existing circuit breakers in order to satisfy market needs. Increases in current-ratings have an even greater effect on the Joule heating in the main circuit of the breakers. The thermal design must account for this increase in heat produced for the breaker to meet various temperature-rise limits set by industry standards. We are studying to enhance the normal current-ratings without major frame change of our present production models. As the method used in this research, we performed the computational analysis using the commercial Package, ICEPAK. We could get optimized thermal design suitable for 25% upgraded normal current-ratings through parametric study.

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