발전소용 4.16 ㎸급 차단기에서 감전사고 사례 분석

박남규 ( Nam Kyu Park ),송재용 ( Jae Yong Song ),김진표 ( Jin Pyo Kim ),고재모 ( Jae Mo Goh ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.4

This paper describes electric shock accidents on a 4.16 ㎸ class circuit breaker for power plant. Electric shock accidentsmostly involve damage of human life, in comparison with electrical fire, rate of human death tend to be higher in electric shock accidents. Specially, in a high voltage facilities rate of human death comprised about 43.7% by electric shock accidents. If electric shock accidentshappen in a 4.16 ㎸ class circuit breaker for power plant, then the power plant discontinue power production. Electric shock accidents ina power plant have a great ripple effect such as an electric power shortage. In this paper, we analyzed electric shock accidents on a 4.16 ㎸ class circuit breaker for power plant. From the analysis results, weconfirmed a cause of electric shock accidents on a 4.16 ㎸ class circuit breaker, it happened by defect of interlock equipment oroccurrence of breakdown between first feeder contactor and shielding plate. In order to reduce electric shock accidents on a 4.16 ㎸ classcircuit breaker, the power plant should consider improvement of interlock equipment and insulation of feeder contactor in circuit breaker.

발전소용 4.16 kV급 차단기에서 감전사고 사례 분석

박남규,송재용,김진표,고재모,Park, Nam-Kyu,Song, Jae-Yong,Kim, Jin-Pyo,Goh, Jae-Mo 한국안전학회 2014 한국안전학회지 Vol.29 No.4

This paper describes electric shock accidents on a 4.16 kV class circuit breaker for power plant. Electric shock accidents mostly involve damage of human life, in comparison with electrical fire, rate of human death tend to be higher in electric shock accidents. Specially, in a high voltage facilities rate of human death comprised about 43.7% by electric shock accidents. If electric shock accidents happen in a 4.16 kV class circuit breaker for power plant, then the power plant discontinue power production. Electric shock accidents in a power plant have a great ripple effect such as an electric power shortage. In this paper, we analyzed electric shock accidents on a 4.16 kV class circuit breaker for power plant. From the analysis results, we confirmed a cause of electric shock accidents on a 4.16 kV class circuit breaker, it happened by defect of interlock equipment or occurrence of breakdown between first feeder contactor and shielding plate. In order to reduce electric shock accidents on a 4.16 kV class circuit breaker, the power plant should consider improvement of interlock equipment and insulation of feeder contactor in circuit breaker.

Investigation of a Novel IGCT Module for DC Circuit Breaker

Qiang Yi,Yifei Wu,Yi Wu,Fei Yang,Zhihui Zhang,Chong Gao 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Power semiconductors for DC circuit breaker (DCCB) have attracted great attentions due to their fast and arc-less operation under full-range current-breaking. Since the robustness of Integrated Gate-Commutated Thyristor (IGCT) is the highest among all full-control power semiconductors, it becomes the perfect power semiconductor candidate for DC circuit breaker. In this paper, the principle and operation of hybrid circuit breaker are introduced. Technical analysis of full-control power semiconductor is conducted and IGCT is the best choice for HCB. Then, A novel power semiconductor circuit based on two IGCTs, diode-bridge, snubber-circuit and MOV is proposed and designed both topologically and structurally. The selection of full-control power semiconductor is discussed and fast recover diode must be used to ensure reliability. Furthermore, the internal current distribution is analyzed. Finally, a test of a single-stage IGCT module prototype demonstrates successful current-breaking at over 10kA and below 4kV, which is promising in the area of fault protection in future MVDC distribution system.

가스보조식 이중행정 유압브레이커의 성능 최적화

류택직,장효환 사단법인 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.1

가스보조식 유압브레이커는 굴삭기에서 공급되는 유압에너지와 유압브레이커 상부에 있는 백헤드가스실의 공압에너지를 피스톤의 운동에너지로 변환하고, 변환된 운동에너지는 툴(tool)을 통하여 타격물에 전달되어 타격물을 파쇄하는 기계장치이다. 이중행정(dual stroke)유압브레이커는 긴 행정과 짧은 행정으로 구성되어 있으며, 긴 행정은 큰 타격에너지를 필요로 하는 단단한 지반에, 짧은 행정은 큰 타격수를 필요로 하는 무른 지반에 사용된다. 가스보조식 유압브레이커에 대한 연구는 상당수 진행되었지만, 체계적인 설계변수 민감도 해석과 이중행정을 고려한 성능향상에 대한 연구는 없는 실정이다. 본 연구에서는 가스보조식 이중행정 유압브레이커에 대하여 수학적 모델을 수립하고 AMESim을 이용한 시뮬레이션에 의해 성능을 해석하였으며, 실험을 통해 타당성을 검증하였다. 민감도해석을 통하여 유압브레이커의 설계변수들이 성능에 미치는 영향을 규명하고 주요 설계변수들을 추출하였다. Taguchi 방법을 적용하여 유압브레이커의 출력을 최대화하는 설계변수들의 최적값을 구하였고 기존설계와 성능을 비교하였다. A gas-assisted hydraulic breaker uses both hydraulic and pneumatic energies and the appropriate balance between them mostly effects its performance. Mathematical modeling of the breaker is established and verified by experiment. Through sensitivity analysis using AMESim, the key design parameters are selected, which mostly affect the performance of the breaker. Taguchi method is used to optimize the key design parameters to maximize the output power for long and short strokes through simulation. As the result, the output power as well as the impact energy are increased significantly compared with the existing design. The pressure pulsation in the supply line is reduced to a tolerable level and the dynamic characteristics of the piston displacement is also improved by the optimization.

가스보조식 이중행정 유압브레이커의 성능 최적화

류택직(Taek Jik Ryoo),장효환(Hyo Whan Chang) 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.1

A gas-assisted hydraulic breaker uses both hydraulic and pneumatic energies and the appropriate balance between them mostly effects its performance. Mathematical modeling of the breaker is established and verified by experiment. Through sensitivity analysis using AMESim, the key design parameters are selected, which mostly affect the performance of the breaker. Taguchi method is used to optimize the key design parameters to maximize the output power for long and short strokes through simulation. As the result, the output power as well as the impact energy are increased significantly compared with the existing design. The pressure pulsation in the supply line is reduced to a tolerable level and the dynamic characteristics of the piston displacement is also improved by the optimization.

New multi-port hybrid DC circuit breaker for DC power grids

Can Ding,Guang Pu,Kaiming Li,Yinbo Ji 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.3

In the field of fault isolation and clearance in flexible DC power grids, hybrid DC circuit breakers (HDCCB) have been widely used because of their advantages. However, their development is limited by high construction costs and inapplicability in some fault cases. In addition, adaptive reclosing capability is required for overhead DC lines with high fault probability. Therefore, this paper proposes a new type of multi-port hybrid DC circuit breaker (MP-HDCCB) with current limiting, breaking, and self-charging capabilities. The capacitor polarity reversal circuit is designed to reduce the influence of capacitor pre-charging on the normal operation of the system and to solve the problem of two consecutive line faults occurring in a short period of time. In addition, the circuit breaker can limit the current and break in the face of a single line fault, multiple line faults at the same time, and bus faults. It also has the ability of adaptive reclosing and normal operation of the line after a bus fault. Based on the proposed topology, a 500 kV four-terminal DC system is designed, and a model is established in PSCAD/EMTDC to verify the capabilities of the circuit breaker. Results show that the circuit breaker has adaptive reclosing capability and can realize fault current limiting and breaking under diff erent fault conditions.

수변전설비에서 접점 불량에 따른 열 및 전계 분포 해석

김기준,Kim, Ki-Joon 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5

Although there are existing Residual Current Protective Device (RCD) including detect electric leakage and elements such as short circuit and surge, the occurrence of incidents caused by electric faults, including fire, are still constant. The purpose of this study is to analyze the causes of accidents through the electric field distribution in the interpretation of the fault contact breaker. Simulation results by the arc fault has shown the convergence of temperature and electric field to the defect. Through their simulation results, the main cause of erosion phenomena in circuit breaker bar is the electric arc by concentration of electric field not due to dissolve by temperature.

직류전원을 이용한 배전급 차단기의 등가 3상 합성투입시험법

박병락(Byung-Rak Park),조만영(Man-Yong Jo),김진석(Jin-Seok Kim),신희상(Hee-Sang Shin),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.7

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[㎸] 31.5[㎄]. 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[㎸] 40[㎸], which satisfies the IEC Standard.

저가형 대기전력 차단장치 개발

이상윤,Lee, Sang-Yun 한국융합신호처리학회 2015 융합신호처리학회 논문지 (JISPS) Vol.16 No.3

가정 및 사무실의 전기/전자 기기가 내부 혹은 외부로부터 주 기능 수행을 위한 명령을 기다리고 있는 상태에서 소모되는 대기전력을 차단할 수 있는 장치를 저가로 개발하였다. 대기전력을 줄이기 위한 노력이 선진국들뿐만 아니라 국제적 차원에서 경주되고 있다. 우리나라도 가구당 전자/전기기기 보유대수가 증가되는 추세에 따른 대기전력이 점차 증가하고 있어 전기 에너지 낭비의 큰 요인이 되고 있다. 기존의 대기전력 차단장치는 그 장치 자체의 소비전력이 크고, 구조가 복잡하여 사용 의미를 퇴색시키는 문제점을 안고 있다. 본 논문에서는 기존 제품의 이러한 문제점을 보완시키고 대기전력을 완전히 차단하는 저가형 대기전력 차단장치를 제안한다. 그리고 제안한 대기전력 차단장치를 누전차단기와 콘센트에 적용하여 회로를 설계 및 구현하고 실험을 통하여 그 우수성을 확인하였다. A device which could cut off the consumption of standby power by electric or electronic devices at homes and offices while waiting for a command to carry out the main functions from the inside or the outside was developed at a low price. Efforts to save standby power have been made on a global scale as well as by advanced countries. The consumption of standby power in South Korea is also increasing gradually due to increasing trend in the number of electronic and electric devices per household, becoming a major factor for waste of electric energy. The previous standby power cutoff devices themselves have high electric energy consumption and complicated structures, making the purpose less meaningful. Therefore, a low-priced standby power cutoff device is suggested in this study, which compensates such problems and cuts off the consumption of standby power completely. The circuit of the suggested standby power cutoff device was designed and implemented by applying it to an earth leakage breaker and an (electrical) outlet. Experimental results show its superiority.

A Study on the Application of SFCL on 22.9 ㎸ Bus Tie for Parallel Operation of Power Main Transformers in a Power Distribution System

온민귀(Min-Gwi On),김명후(Myoung-Hoo Kim),김진석(Jin-Seok Kim),유일경(Il-Kyoung You),임성훈(Sung-Hun Lim),김재철(Jae-Chul Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.1

This paper analyzed the application of Superconducting Fault Current Limiter (SFCL) on 22.9 [㎸] bus tie in a power distribution system. Commonly, the parallel operations of power main transformers offer a lot of merits. However, when a fault occurs in the parallel operation of power main transformer, the fault currents might exceed the interruption capacity of existing protective devices. To resolve this problem, thus, the SFCL has been studied as the fascinating device. In case that, Particularly, the SFCL could be installed to parallel operation of various power main transformers in power distribution system of the Korea Electric Power Corporation (KEPCO) on 22.9 [㎸] bus tie, the effect of the resistance of SFCL could reduce the increased fault currents and meet the interruption capacity of existing protective devices by them. Therefore, we analyzed the effect of application and proposed the proper impedance of the R-type SFCL on 22.9 [㎸] bus tie in a power distribution system using PSCAD/EMTDC.