http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
DC계통의 고장발생시 변압기와 초전도체의 결합 및 위치에 따른 고장전류 특성 분석
구희석(Hui-Seok Gu),안준재(Jun Jae An),여서현(Seo Hyun Yeo),오현주(Hyun Ju Oh),김종철(Jong Cheol Kim),최정훈(Jung-Hoon Choi),김춘성(Chun Sung Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
DC 계통 내 고장발생시 효과적인 전류 제한 및 차단을 위해 기존에 변압기와 초전도체를 결합한 DC 차단기를 제안하였다. 이에 본 논문에서는 향후 마이크로그리드 및 분산전원의 연계 및 적용을 위해 고장발생 시스템을 모의하여 효과적인 제한과 차단 시스템을 적용하고자 변압기와 초전도체의 결합 위치에 따른 고장전류 특성을 분석하였다.
Hui-Seok Gu(구희석),Sang-Yong Park(박상용),Hyo-Sang Choi(최효상) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
This study proposes two types of current-limiting DC circuit breakers coupled with a superconductor. The first superconductive DC circuit breaker limits the size of the fault current by quenching the superconductor when a fault occurs. Then the limited fault current is blocked by the DC circuit breaker. The second transformer-type superconductive DC circuit breaker limits the fault current and performs blocking operation through the impedance characteristics of the transformer and the quench characteristics of the superconductor. This study analyzes the blocking characteristics of the two types of current-limiting DC circuit breakers. The blocking performance, current limiting rate, and power sharing ratio of the breakers were analyzed using the same simulation conditions for each type of breaker. The simulation results showed that the transformer-type superconductivity DC circuit breaker has the highest fault current limiting rate. Furthermore, the superconductive DC circuit breaker completed the fault current blocking operation the fastest. Finally, it was verified that the applied power burden to the superconductor is lowest at the transformer-type superconductive DC circuit breaker.
Hui-Seok Gu(구희석),Sang-Yong Park(박상용),Hye-Won Choi(최혜원),Hyo-Sang Choi(최효상) 대한전기학회 2021 전기학회논문지 Vol.70 No.6
DC cutoff must be completed within a few ms. Therefore, this paper derives the optimal superconducting wire winding method for efficient current limiting and fast execution of the blocking operation. First, the electromagnetic field characteristics of the superconducting wire according to the winding type were analyzed using the Maxwell program. After that, the EMTDC/PSCAD program was used to analyze the DC blocking performance according to the winding type. Based on the simulation results, as a result of the DC cut-off experiment for each winding type, the spiral type superconductor has a higher resistance rise curve than the helical type, so it is possible to limit the current efficiently by up to 4.01%. In addition, as the magnetic field characteristics are high, the quench of the superconductor operates quickly and the operation time of the circuit breaker is shortened by 0.19 ms, so it can be confirmed that the blocking completion time is also reduced by 0.25 ms.