• 제목/요약/키워드: low-voltage circuit breaker

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저압용 IEC 차단기와 국내 차단기 혼용방안에 관한 연구 (The Study About Low Voltage Circuit Breaker Mix Method Between IEC Circuit Breaker and Domestic Circuit Breaker)

  • 정진수;김한상;한운기;김선구;박찬엄
    • 전기학회논문지
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    • 제61권6호
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    • pp.905-909
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    • 2012
  • Recent WTO/TBT agreement was adopted by the IEC domestic. For this reason, low voltage electrical equipment was many Confusion arises. Low voltage circuit was also one of these. The case of low voltage circuit, existing domestic circuit breakers and circuit breakers IEC curve differs from the behavior of each other. If low voltage circuit breaker wrong facility, circuit breaker malfunction may occur due to the large property damage. In this paper, to solve these problems domestic circuit breakers and circuit breaker operation IEC curves were analyzed. And, through experiments suggested compatible breaker way.

PPTC 소자를 사용한 저전압 직류차단기의 아크소호기술 (Arc Extinguishment for Low-voltage DC (LVDC) Circuit Breaker by PPTC Device)

  • 김용중;나재호;김효성
    • 전력전자학회논문지
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    • 제23권5호
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    • pp.299-304
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    • 2018
  • An ideal circuit breaker should supply electric power to loads without losses in a conduction state and completely isolate the load from the power source by providing insulation strength in a break state. Fault current is relatively easy to break in an Alternating Current (AC) circuit breaker because the AC current becomes zero at every half cycle. However, fault current in DC circuit breaker (DCCB) should be reduced by generating a high arc voltage at the breaker contact point. Large fire may occur if the DCCB does not take sufficient arc voltage and allows the continuous flow of the arc fault current with high temperature. A semiconductor circuit breaker with a power electronic device has many advantages. These advantages include quick breaking time, lack of arc generation, and lower noise than mechanical circuit breakers. However, a large load capacity cannot be applied because of large conduction loss. An extinguishing technology of DCCB with polymeric positive temperature coefficient (PPTC) device is proposed and evaluated through experiments in this study to take advantage of low conduction loss of mechanical circuit breaker and arcless breaking characteristic of semiconductor devices.

디지털 신호 처리 기반 저압 차단기용 전자식 계전기 개발 (A Development of Electronic Type Relay for Low Voltage Circuit Breaker based on Digital Signal Processing)

  • 박병철;손종만;송성근;신중린
    • 조명전기설비학회논문지
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    • 제27권5호
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    • pp.81-88
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    • 2013
  • A low voltage circuit breaker protects electrical equipments from over current and short faults of system by cutting the power supply. The breaker use a thermal magnetic type trip device from the past. In recent years, electronic type relays are applied due to useful functions and services. The purpose of this development is full digitalizing of relay functions of a low voltage breaker. It includes separation of current sensor from current transformer, digital signal processing, high speed relaying, and voltage measuring for power meter. The suggestions are tested and implemented by making prototype and testing its all relay functions.

가속 열화 시험에 따른 저압용 차단기의 물리적 특성에 관한 연구 (A Study on the Physical Characteristics of the Low-voltage Circuit Breaker Based on the Accelerated Degradation Test)

  • 강신동;김재호
    • 한국안전학회지
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    • 제37권6호
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    • pp.1-8
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    • 2022
  • This study analyzed the characteristics of insulation resistance and operating time based on an accelerated degradation test of a low-voltage circuit breaker. The experimental sample used a molded case circuit breaker (MCCB) and an earth leakage circuit breaker (ELCB). After measuring the insulation resistance of the circuit breakers, the leakage current was affected by an external rather than an internal structure. Furthermore, the insulation resistance of the circuit breakers with accelerated degradation was measured using a Megger insulation tester. In the accelerated degradation test, aging times of five, ten, 15, and 20 years were applied according to a temperature derived using the Arrhenius equation. Circuit breakers with an equivalent life of ten, 15, and 20 years had increased insulation resistance compared to those with less degradation time. In particular, the circuit breaker with an equivalent life of ten years had the highest insulation resistance. Component analysis of the circuit breaker manufactured through an accelerated degradation test confirmed that the timing of the increase in insulation resistance and the time of additive loss were the same. Finally, after analyzing the operating time of the circuit breakers with degradation, it was confirmed that the MCCB did not change, but the ELCB breaker failed.

아크사고 발생 시 전압 왜형파를 이용한 아크차단기 개발 (Development of Arc Fault Circuit Interrupter Using the Distorted Voltage Wave in Electric Arc Faults)

  • 곽동걸
    • 전기학회논문지
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    • 제62권6호
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    • pp.876-880
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    • 2013
  • The major causes of electrical fire are classified to short circuit fault, overload fault, electric leakage and electric contact failure. The principal factor of the fire is electric arc or spark accompanied with such electric 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 30[ms] (KS C 4613), the RCDs can't perceive to the periodic electric arc or spark of more short wavelength level. To improve such problems, this paper studies on an arc fault circuit interrupter (AFCI) using the distorted voltage wave in electric arc faults. The proposed voltage sensing type AFCI is an electrical fire prevention apparatus of new conception that operates a circuit breaker with sensing the instantaneous voltage drop of line voltage at electrical faults occurrence. The proposed AFCI is composed of control circuit topology using some semiconductor switching devices. Some experimental tests of the proposed AFCI confirm practicality and the validity of the analytical results.

IEC규격에 의한 고장전류해석 및 차단기용량선정 (The short-circuit calculation and circuit breaker selection as IEC standard)

  • 이경호
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2007년도 춘계학술대회 논문집
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    • pp.433-436
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    • 2007
  • This paper analyzes how to calculate the three phase short-circuit currents for ac electrical system and select the high & low voltage circuit breaker based on IEC60609, IEC60056 and IEC60947-2 standards. We proposed the multiplying factor considering system time constant and circuit breaker rating to select circuit breaker accurately.

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IEC 60909에 의한 삼상 고장계산 (Three-phase Fault Calculation by IEC 60909)

  • 손석금
    • 전기학회논문지P
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    • 제63권1호
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    • pp.12-18
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    • 2014
  • This paper analyzes how to calculate the three phase short circuit current calculation procedures used in the IEC 60909 short circuit. It presented the new procedure of the fault current for the interrupting capacity of the circuit breaker. This procedure is applied to the future power system and calculates the fault current. Power demands are increased because of the growth of the economy for this reason, the fault current of the power system is largely increased and the fault current procedure for the proper interrupting capacity calculation of the existing or the new circuit breaker is essential. How to calculate the three phase short circuit current for ac electrical system and select the high voltage and low voltage circuit breaker based on IEC 60909 standards.

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

  • 이창용;송태헌;김진수;김덕중;이두희;이관희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기물성,응용부문
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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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저압차단기기의 보호협조 (The Protective Co-ordination between Low-Voltage Circuit-Breaker)

  • 박성찬;오준식;이방욱;유만종;서정민
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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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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제어케이블의 설치기법 개선에 의한 배전자동화용 개폐기의 EMC 성능 향상 (EMC Performance Improvement of Distribution Automation Circuit-Breaker by Modified Installing Method of Control Cable)

  • 김언석;김재철
    • 조명전기설비학회논문지
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    • 제17권5호
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    • pp.60-67
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    • 2003
  • 본 논문에서는 개폐기의 EMC 성능 개선방안을 연구하였다. 개폐기와 제어함은 멀티 제어 케이블로 연결되었다. 또한 각 장치에는 많은 제어 케이블이 설치되었다. 이들 제어 케이블은 전자부품과 직접 연결된다. 그러므로 제어 케이블은 EMC 성능 향상에 중요한 요소이다. EMC 성능 개선방안으로 제어 케이블과 나란히 병렬접지도체 (Parallel Grinding Conductor, PGC) 설치를 제안하였다. 또한 개폐기 내에 설치된 전압 변성기의 2차 케이력은 차폐 케이블을 사용하고, 차폐의 양단을 접지하는 것을 제안하였다. 개선방안 적용 후 개폐기의 EMC성능이 향상되었음을 확인하였다.