• Title/Summary/Keyword: Current Circuit Breaker

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A Study on Arc Conductance of Puffer Type SF6 GCB at Current Zero Period (전류영점 영역에서 파퍼식 SF6 가스차단기의 아크 컨덕턴스에 관한 연구)

  • Chong, Jin-Kyo;Song, Ki-Dong;Lee, Woo-Young;Kim, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.328-332
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    • 2010
  • The SLF(Short Line Fault) breaking capability test for high voltage class $SF_6$ GCB(Gas Circuit Breaker) was conducted. Simplified LC resonant circuit test facility was used for SLF breaking test. During test, Test current was measured by Rogwski coil and arc voltage was measured by voltage divider. Arc conductance was calculated by using these test results before 200ns at current zero. Critical arc conductance value at rated voltage 145kV class is about 2.3mS regardless of breaking current magnitude and arc conductance value at rated voltage 170kV class is about 2.6mS.

Study on The Small-Gap Measuring System for Gas Velocity Measurement of $SF_6$ Gas Circuit Breaker ($SF_6$ 가스차단기에서 가스 속도측정을 위한 Small-Gap 측정시스템에 관한 연구)

  • Kim Hong-Kyu;Dong Song-Ki;Lee Woo-Young;Park Kyong-Yop;Chong Jin-Kyo
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.3
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    • pp.139-144
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    • 2005
  • [ $SF_6$ ] gas circuit breakers are widely used short circuit current interruption in EHV or UHV power system. For a $SF_6$ gas circuit breaker development, the $SF_6$ gas velocity measurement is necessary during $SF_6$ circuit breaker's trip operation. Small-gap flashover characteristics are used for this measurement. So, small-gap measuring system which will be used to develope GCB should be developed. This study shows the characteristic analysis and experimental results of small-gap measuring system.

A Study on A Hot Gas Velocity Measurement in GCB Using Small-Gap (Small-Gap을 이용한 가스차단기에서의 열가스 속도측정에 관한 연구)

  • Kim, Hong-Kyu;Song, Ki-Dong;Park, Kyong-Yop;Hong, Jung-Pyo;Chong, Jin-Kyo
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.3
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    • pp.155-158
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    • 2006
  • $SF_6$ gas circuit breakers we widely used for short circuit current interruption in EHV or UHV power system. For a $SF_6$ gas circuit breaker development, the hot gas velocity measurement is necessary during $SF_6$ gas circuit breaker's trip operation. Small-gap flashover characteristics are used for this hot gas velocity measurement. This study sho was the hot gas velocity measurement results during $SF_6$ gas circuit breaker' trip operation.

A Novel AC Solid-State Circuit Breaker with Reclosing and Rebreaking Capability

  • Kim, Jin-Young;Choi, Seung-Soo;Kim, In-Dong
    • Journal of Power Electronics
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    • v.15 no.4
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    • pp.1074-1084
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    • 2015
  • These days, the widespread use of sensitive loads and distributed generators makes the solid-state circuit breaker (SSCB) an essential component in power circuits to achieve a high power quality for AC Grids. In traditional AC SSCB using SCRs, some auxiliary mechanical devices are required to make the reclosing operation possible before fault recovery. However, the proposed AC SSCB can break quickly and then be reclosed without auxiliary mechanical devices even during the short-circuit fault. Moreover, its fault current breaking time is short and its SSCB reclosing operation is fast. This results in a reduction of the economic losses due to fault currents and power outages. Through simulations and experiments on short-circuit faults, the performance characteristics of the proposed AC SSCB are verified. A design guideline is also suggested to apply the proposed AC SSCB to various AC grids.

The Study of the Verification Test for Development of Contacts(50kA) of Making Switch and Back Up Breaker (대용량(50kA)의 Making Switch와 Back Up Breaker 접점 개발에 따른 검증시험의 연구)

  • Kim Sun-Koo;Kim Won-Man;La Dae-Ryeol;Roh Chang-Il;Lee Dong-Jun;Jung Heung-Soo
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.842-844
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    • 2004
  • The Back Up Breaker and Making Switch are very important equipments for the short circuit test facility, and contacts are the most important parts of the above switches. There are very many kind of contacts according to switches characteristic and should be done the verification test before use, especially development contacts. This study describes the class of switches, arc chute, material of whole contacts and essential test for verification. The essential test for verification are dielectric test, mechanical operation test, short-time withstand current test, load current breaking test, and short-circuit making current test etc.

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Review for verification of capacitive current performance by using synthetic testing method (합성시험법을 이용한 진상소전류 성능검증에 관한 고찰)

  • Park, Seung-Jae;Kim, Yong-Sik;Park, Yong-Hwan;Kim, Maeng-Hyun;Koh, Heui-Seog
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.466-467
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    • 2006
  • Several synthetic testing methods have widely been used for the performance evaluation of ultra high-voltage circuit breaker. Among these synthetic method, in the paper, capacitance switching testing method which can meet the test requirements and increase the testing capacity has been proposed. This method is made up of two separated sources of short-circuit generator for current source and L-C resonance circuit for voltage source. By using this method, KERI will perform the performance evaluation of capacitive current switching performance for the 800kV GCB(Gas Circuit Breaker).

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Circuit Interruption Performance Evaluation of $SF_6$ GIS Based Results of Cold Flow and Electrical Field Analysis ($SF_6$ 가스절연개폐기의 냉가스유동해석과 전계해석을 기초로 한 차단성능평가)

  • Bae, Dong-Jin;Song, Tae-Hun;Choi, Young-Chan;Lee, Ki-Ju;Kim, Ik-Mo;Kang, J.H.
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.89-91
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    • 1999
  • The performance of circuit interruption of $SF_6$ puffer cylinder type gas circuit breaker(GCB) has been evaluated from the results of electrical insulation strength which is depend on material property, such as $SF_6$ gas density in circuit breaker tank. In order to determine circuit breaker dimension in the safety criteria. electrical field analysis has been done by finite element method. Gas density of concerned area in the circuit breaker has been calculated. In order to predict small current break performance, Electrical field analysis result must be calculated based the results of density from cold flow dynamics. The proposed method has been carried out and evaluated for 362kV class high voltage GIS.

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Safely Improving Method to Zero-Harmonics Current with 4-Pole Low Voltage Circuit Breaker Equipped N-phase Trip Device (4극 저압차단기 N상 Trip장치를 사용한 영상고조파 안전성 개선방안)

  • Ki, Che-Ouk;Kim, Ju-Chul;Choi, Chang-Kyu
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.05a
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    • pp.458-461
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    • 2009
  • In 3-phase 4 wire system, appearance of the $3^{rd}$ harmonic current by increasing non-liner load is the one of causes overheating neutral wire of power line, and apparatus. So it is necessary to protect power-factor decreasing by the $3^{rd}$ harmonic, and electric power apparatus, and line safely, in this study, power system accidents caused by the $3^{rd}$ harmonic were investigated, then harmonic components analysis and unbalanced load analysis got accomplished. As result, we proposed the method to protect the power line and apparatus from over-current of neutral line by using the most economic 4-pole low voltage circuit breaker.

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Interrupting Test of Molded Case Circuit Breaker with Strong Driving Magnetic Force (강자계 구동형 460V/225A/50kA 배선용 차단기 대전력 차단성능평가)

  • Choi, Y.K.
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.36-38
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    • 2002
  • Low voltage circuit breakers which interrupt rapidly and raise the reliability of power supply are widly used in power distribution systems. In the paper, it was investigated how much Interrupting capability was improved by correcting the shape of the contact system in molded case circuit breaker(below MCCB), Prior to the interrupting testing, it was necessary for the optimum design to analyze magnetic forces on the contact system, generated by current and flux density. This paper presents both our compuational analysis and test results contact system in MCCB.

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The Operating Characteristic Analysis of PM-type Magnetic Circuit Breaker (영구자석형 차단기 조작기의 동작 특성 해석)

  • Jun, Hee-Deuk;Woo, Kyung-Il;Kim, Byung-Taek;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2000.11b
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    • pp.253-255
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    • 2000
  • This paper describes the operating characteristic analysis of PM-type magnetic circuit breaker for electromagnetic field, electric circuit and mechanical motion problems. Transient calculations based up 2D finite element magnetic field solution including non-linearity of materials. Change of dynamic characteristic from eddy current in mover is quantified from FEM analysis.

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