• 한국전자통신학회논문지
• /
• 제17권3호
• /
• pp.441-448
• /
• 2022

배전분야 전력계통에 적용되는 보호기기류는 변전소 차단기, 배전선로의 리클로저, 최소 전류 용량 회로, 고장구간 차단기 등이 있다. 이들은 부분 정전이나 대규모 사고를 방지하고 선로의 순간고장 또는 영구고장 발생 시 정상 계통이 건전성을 유지할 수 있도록 광역 정전 파급을 방지한다. 그러나 사고가 발생할 경우 변전소 차단기와 배전선로 보호기기 간의 보호협조 미비로 인하여 광역 정전을 초래할 수 있다. 더 좋은 전력시스템의 건전성을 확보하기 위하여 1주기(16ms) 이내로 동작하는 차단기를 개발할 필요성이 요구된다. 본 연구에서는 친환경 가스절연 방식의 고속도 차단기를 개발하였으며, IEC 62271-111 표준에 기반한 시험에서 우수한 결과를 얻었다. 이 기기는 고장구간을 정확하고 빠르고 신속하게 분리하여 광역 정전 예방에 기여할 것으로 기대된다.

• 조명전기설비학회논문지
• /
• 제25권7호
• /
• pp.105-113
• /
• 2011

The study about three-phase synthetic making test using DC power has been performed in order to increase the making test capacity on Vacuum Circuit Breaker. And, it made possible to solve the limitations that short-circuit testing facilities can not fulfill the testing requirements of VCB exceeding three-phase 36[kV] 31.5[kA]. By using DC power and high speed spark-gap switch, this method made the equivalence with the pre-arc that occurred during the making process under the fault condition of power system. As results, KERI(Korea Electrotechnology Research Institute) could have capacity to carry out type test for VCB under three-phase 52[kV] 40[kV], which satisfies the IEC Standard.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제54권3호
• /
• pp.139-144
• /
• 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.

• 수산해양기술연구
• /
• 제14권2호
• /
• pp.89-95
• /
• 1978

A SCR static breaker was studied on the Resistive and inductive load, then on the overload break circuit using operational Amplifier. In this paper, the principal circuit required for forced commutation was voltage commutation by the introduction of a parallel Capacitor. The results obtained are follows; 1. In thecondition that the tima constant of R-C circuit is larger than the turn off time of SCR, the breaker has low transient phenomena and no recovery vol age. 2. By using OP Amplifier on the load circuit, overcurrent trip point will be able to adjust to the wide range of over current. 3. In the over current qrcuit, the power loss was reduced remarkably.

• 산업기술연구
• /
• 제35권
• /
• pp.41-45
• /
• 2015

This paper presents a development of the ELB (Electronic Leakage Breaker) based on a reduction of standby power dissipation as with maintaining conventional performance. In order to minimize the standby power consumption of the conventional circuit, we analyze the cause of 0.3W dissipation of the circuit. By employing the TR-triggered circuit to secure the standby power of 0.10W after testing and evaluation while CRD inserted circuit showed the performance of 0.17W levels. Implementing SMPS IC and TNR device circuit was designed and showed of its power to less than 0.06W. Developed ELB is expected much standby power savings in large power distributor or heavy users.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제55권3호
• /
• pp.155-158
• /
• 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.

• 대한전기학회논문지
• /
• 제39권1호
• /
• pp.10-15
• /
• 1990

본 논문에서는 전력계통에 발생할 수 있는 3상단락 고장전류 계산에 있어서 등가 임피던스를 효율적으로 계산하는 알고리즘을 제시하고, 확률적으로 고장전류 분포를 해석하여 차단기 용량을 선정하는 방법을 제시한다. 즉, 고장점에 따른 모선 어드미턴스 변화분을 계산 하므로서 고장등가 임피던스를 계산하고 특정선로의 고장점을 변화시키며 3상단락 고장전류의 확률적 분포를 해석하여 적정용량의 차단기를 선정하는 방법을 제시하였다. 제시한 알고리즘으로 IEEE-6 모선 계통과 IEEE-30모선계통에 적용하여 효용성을 입증하였고 확륙적 고장전류 해석 방법은 적정 차단기 용량을 선정함으로써 설비 투자비면에서 경제적임을 입증하였다.

• Journal of Power Electronics
• /
• 제15권4호
• /
• pp.1074-1084
• /
• 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.

• Journal of Electrical Engineering and Technology
• /
• 제9권1호
• /
• pp.254-258
• /
• 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.

• 전기학회논문지
• /
• 제58권7호
• /
• pp.1321-1328
• /
• 2009

In this paper, an electromagnetic force driving actuator (EMFA) and three-link mechanism are proposed as a driving mechanism and connection device for low voltage air circuit breaker (ACB). As the result of dynamic characteristic analysis, the actuator and link mechanism are designed from the simulation and manufactured. The magneitc field of the EMFA is analyzed using the finite element method (FEM). The dynamic characteristic analysis with calculation of the circuit equation and kinetical equation is performed by the time difference method (TDM). Also, the result of the analysis is verified through the experiment of the fabrication model. In this paper, the EMFA size is smaller than the actuator for high voltage circuit breaker. Thus, the dynamic characteristic is analyzed with end-winding inductance that is calculated by the same method which is applied on the circle type end-winding of motors. The designed model for 1600 ampere-frame ACB and the three-link mechanism for connecting contact part with actuating part are manufactured. It is confirmed that the three-link mechanism is possible for improving the circuit breaker efficiency and reducing the size of the EMFA. It is proved that the improved 2-D analysis is more accurate than established method.