• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1438-1439
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• 2007

저압기중차단기의 한류성능 분석 및 개선을 위해서는 ACB에서 발생하는 아크전압에 대한 정보가 필요하다. 그러나 아크의 비선형적 특성 때문에 이론적 접근에는 한계가 있으므로, 실험적 접근을 통해 아크전압을 계측하고 분석하였다. 고온고압하의 아크 발생 환경에서 소호그리드간의 아크전압을 측정하기 위해서 열적, 절연적 특성이 우수한 테플론 피복 케이블을 적용하였다. 소호그리드의 배치를 변화시켜 가면서 입출력 단자간 전압과 소호그리드간 전압을 측정하고 분석하였다. 이와 같은 연구를 통해 소호그리드의 아크전압상승 영향에 대한 기초적인 결과를 얻을 수 있었다.

• Journal of the Korean Society for Railway
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• v.19 no.2
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• pp.117-123
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• 2016

High speed circuit breakers(HSCB) interrupt the generated arc within the arc chute to turn off the electricity flowing through the main circuit to prevent ground faults. In order to explore the arc generated from the contactor operation, arc definition, establishment of arc interruption method, and analysis of magnetic driving force are required. In this paper, arc interruption capability has been estimated by exploring the difference in magnetic flux density of Lorenz forces using finite element analysis. In addition, since the number of grids and changes in the grid shape within the arc chute influence the formation of the inner magnetic field, its effects have been explored to enhance arc interruption capability. Assessment of interruption capability and analysis of grid shape, with rated operating current, are reported.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.456-457
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• 2007

ATCB의 구조 중 아크 소호부는 공기 중에 노출된 금속(그리드)이 일정한 간격을 두고 적층되어 있는 모양을 하고 있다. 아크 소호부의 주기능은 아크를 소호실 안쪽으로 유도하여(기중 차단방식) 여러 개의 짧은 아크로 분할시키며 아크를 냉각, 소멸시켜 전류 차단을 빠르게 하는 것이다. 아크를 구동시키는 소호살의 형상과 구조에 따라 아크의 구동력은 많은 차이를 보이게 된다. 여기서는 신개념의 자동절체 스위치인 ATCB(Automatic Transfer Circuit Breaker)의 그리드의 구조에 따라 아크 구동력을 비교하여 아크 소호부의 최적 형상과 절연구조를 설계, 모델링하였다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1330-1331
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• 2008

MCCB와 같은 저압차단기는 접점사이에서 발생한 아크를 금속의 소호그리드로 유입하여 아크를 소호하게 된다. 일반적으로 고장 전류 차단시에 저압차단기에서 발생한 아크는 고압.고열이므로 아크에너지에 의해 소호부의 압력이 크게 상승하게 되며 압력에 의해 아크의 거동은 큰 영향을 받게 되므로 아크 구동력의 증가를 위해서는 압력에 의해 아크거동이 어떠한 영향을 받는지에 대한 정보가 필요하다. 본 연구에서는 압력파의 영향을 명확하게 하고 다른 요소에 의한 영향을 배제하여 압력파와 아크거동간의 상호작용만을 실험하기 위해 시험용 소호부를 고안하여 시험용 소호부에서 아크의 압력과 거동을 측정.분석하여 아크거동과 압력파의 관계를 연구하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.6
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• pp.123-128
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• 2021

As the spread of DC power distribution systems increases, the occurrence of failures and fire accidents are also increasing. In particular, the ESS fire accident, which is a component of the smart grid, and the fire accident of the solar power system, which is a direct current system, are caused by problems in the electrical connection between system components as the supply of new and renewable energy rapidly increases and old facilities increase. An arc that can cause a direct fire by releasing the induced light and heat has been pointed out as one of the causes of fire. Therefore, the problem of such an arc defect is that it is impossible to block an arc accident in advance with the existing overcurrent circuit breaker and earth leakage circuit breaker. In this paper, we intend to develop a test equipment that satisfies international standardization and to develop a DC arc generator to protect against failure and fire caused by arcing.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.304-305
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• 2017

AC 그리드에 비해 DC 그리드는 전류의 영교차점이 없으므로 사고전류를 신속하게 차단하지 못 한다면 아크나 스파크에 의한 전기화재가 발생하여 큰 피해가 따른다. 본 연구에서는 신속한 차단과 전류 커패시터를 쉽게 충전할 수 있는 구조가 간단한 새로운 DC SSCB를 제안한다. 제안하는 DC SSCB는 단락사고를 모의하여 시뮬레이션 및 실험을 통해 동작특성을 검증한다. 본 논문에서 연구한 DC SSCB는 향후 DC 그리드 시스템의 설계 및 구현에 활용될 것으로 기대된다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.21 no.9
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• pp.42-49
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• 2022

An underground electric switch is a high-voltage switch used in distribution network systems for a reliable power supply. Many studies are being conducted to expand the switch to use an eco-friendly gas using dry air instead of SF6 gas to reduce greenhouse gas emissions. In this study, a flow analysis model was established to improve the performance of an eco-friendly gas switch. The results were compared and reviewed through experiments. For the optimal arc grid design applied to the switch, the flow characteristics based on the flow path configuration and the changes in arcing time for each configuration were compared. Flow analysis can predict the switch flow distribution, and a comparative review of the flow path configurations of various methods is possible.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.461-463
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• 2016

Information security and preservation of customer's data privacy are key factors for further wide spread adoption of microgrid (MG) technology. However, strong coupling between the operation cost of multi-microgrid (MMG) system and privacy of customer data makes it more challenging. A nested energy management system (EMS) has been proposed in this paper. The surplus/shortage information from the inner level MGs is included in processing the optimal operation of outer level MGs. This type of optimization ensures a layered privacy-preservation to customer at each MG level. The proposed EMS architecture is a better trade-off architecture between the operation cost of the MMG system and customer privacy-preservation at each level of MG.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.464-465
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• 2016

This paper analyzes the capabilities of multi-agent system (MAS) technology for the optimal multi-microgrids (MMGs) operation in grid-connected mode. In this system, communication among microgrids (MGs) is realized by developing a modified contract net protocol (MCNP) based on agent communication language (ACL) messages. Moreover, a two-stage mathematical model is proposed based on mixed integer linear programming (MILP) for local optimization in each MG, and global optimization in energy management system.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.6
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• pp.1069-1074
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• 2020

Since DC has no zero point, an arc occurs when the DC circuit breaker performs a shutdown operation. In this case, a fatal accident may occur in the circuit breaker or in the grid, depending on the magnitude of the arc. Therefore, the shutdown performance and the reliability of the circuit breaker are important in the commercialization of HVDC. In this study, a superconducting LC circuit breaker was proposed to improve the performance and the reliability of the DC circuit breaker. The superconducting LC circuit breaker applied a superconducting coil to the inductor of the existing LC circuit breaker. Other than limiting the initial fault current, it also creates a stable zero point in the event of a fault current. To verify this, simulation was performed through EMTDC/PSCAD. Furthermore, the superconducting LC circuit breaker was compared with the LC circuit breaker with a normal coil. As a result, it was found that the LC circuit breaker with the superconducting coil limited the initial fault current further by approximately 12 kA compared to the LC circuit breaker with a normal coil. This reduced the arc extinguish time by approximately 0.16 sec, thereby decreasing the elctrical power burden on the circuit breaker.