• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.1991-1993
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• 2004

가스절연개폐장치에서 발생하는 사고를 예방하기 위해서는 방전 위치 및 방전원인을 방전신호로부터 유추하는 것이 핵심 기술이다. 본 논문에서는 다양한 방전원에 대한 신호 유형을 정리하고 방전원별 특성을 추출하여 실제 부분방전 발생시 방전원을 쉽게 유추할 수 있도록 하였다.

• Proceedings of the KIEE Conference
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• 2004.11d
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• pp.59-62
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• 2004

가스절연개폐장치에서 발생하는 고장을 조기에 예방하기 위해서는 방전신호를 분석하여 방전을 일으키는 결함을 유추하는 것이 핵심 기술이다. 본 논문에서는 UHF 대역에서 알고 있는 결함에 의한 방전신호를 측정하여 다양한 가시화 방법으로 방전유형을 분류, 정리함으로써 미지의 방전신호로부터 방전원인을 추정할 수 있도록 하였다.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.1843-1845
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• 2000

GIS(Gas insulated switchgear)내부에서 발생한 부분방전 신호를 검출 할 수 있는 UHF(Ultra-high frequency) 부분방전 검출 센서를 345 kV GIS의 AC 내전압 시험에 적용하였다. 부분방전 센서를 적용한 상태에서 각 상별로, bus별로 나누어 계통 최고전압의 1.0 p.u, 1.5 p.u, 1.73 p.u 전압을 단계적으로 인가하였으며 간헐적으로 부분방전 신호가 검출됨을 확인하였다. 간헐적인 부분방전 신호는 GIS 내부에 있던 이물질에서 약한 방전이 시작되고 인가전압을 높임에 따라 방전의 강도가 증가하다 소멸되었다. 방전을 일으킨 이물질이 모두 증발되었거나 위치 변화에 의해 방전이 소멸된 것으로 판단된다.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2208-2210
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• 2005

전문적인 지식이 없는 UHF 부분방전 측정장치 사용자를 위해 자동으로 측정된 신호로부터 GIS 내부의 결함을 추론할 수 있는 신경망회로 엔진을 연구하였다. 측정된 방전신호로부터 적절한 변수들을 계산하고 이를 신경망회로를 이용하여 미리 분류한 GIS 결함들 중 가장 유사한 결함을 자동으로 표현하는 기능을 엔진이 가지도록 하였다. 특히 본 엔진은 3상 일괄형 GIS나 GIS의 전압 위상에 동기되지 않은 부분방전 측정시스템에도 방전 원인을 잘 추론함을 실험을 통하여 확인하였다.

• Proceedings of the KIEE Conference
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• 2003.07c
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• pp.1618-1619
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• 2003

개방형 스페이서(barrier)가 적용된 가스 절연개폐장치(GIS)에 외장형 부분방전(PD) 센서를 적용 하고 센서장착부, 인근 스페이서 또는 부싱으로 유입되는 광대역 잡음신호의 투과율을 10 - 2000 MHz의 극초단파 영역에서 측정하였다. 또한 간단한 금속 차폐체에 의한 잡음신호의 감쇄효과도 측정 하였다. 스페이서 또는 부싱을 통하여 인근센서에 유입되는 잡음의 크기는 차폐시와 대비하여 약 25 dB 증가하였다.

• Proceedings of the KIEE Conference
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• summer
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• pp.107-109
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• 2004

It is very important to operate a power system safely. An fault may causes the cascading outages in power system. Use of systematic, precise definitions related to the outages is essential for meaningful exchange of data. Moreover, it is necessary that specific instructions for reporting outages is developed. This paper presents the outage management for a power system. The outage managements of the many utilities are researched, which include the definition, classification, index and report of outage. Finally, the outage management standard is proposed, and the necessity and structure of KERC(Korean Electric Reliability Council) are presented

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.63 no.3
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• pp.131-137
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• 2014

It is expected that there will be delay of scheduled transmission network reinforcement and huge investment of renewable energy resources in Korea. As transmission capacity expansion delayed, supplying power to Seoul metropolitan area will not be increased as scheduled. In addition, uncertain renewable energy out of Seoul metropolitan area can cause transmission congestion in the future power system. These two combining effects will make the difference in locational marginal prices(LMP) and congestion costs increase. In that sense, this paper will analyze how much the congestion costs for Korea power system are incurred in the future power system. Most of previous approaches to analyze the congestion costs for electric power system are based on the optimal power flow model which cannot deal with hourly variation of power system. However, this study attempted to perform the analysis using market simulation model(M-Core) which has the capability of analyzing the hourly power generation cost and power transmission capacity, and market prices by region. As a result, we can estimate the congestion costs of future power system considering the uncertainty of renewable energy and transmission capacity.

• New & Renewable Energy
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• v.6 no.2
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• pp.19-26
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• 2010

Experiences in wind farm operation are very limited in Korea, and the foundation for setting standards in power system connection is weak. Therefore, connection and operation standards for wind farms in other countries must be reviewed and power system operation criteria need to be established in order to set up connection standards and optimal operation plans according to the Jeju power system. In this study, reactive power control characteristics of a wind farm were analyzed using a wind farm model of the Jeju power system to propose power system connection operation standards for wind generation within the Jeju power system. Also, change in characteristics of the power system for the application of each reactive power control standard was confirmed, and the results were verified through trial tests arm was analyzed.

• Journal of Electrical Engineering and Technology
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• v.1 no.1
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• pp.28-34
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• 2006

Recently, in accordance with the development of IT technology, it is prevalent for power quality monitors to be connected to each other via networks and share their data because such networks provide system-wide insights to customers concerning power quality. Those systems can alarm and display power quality events for the convenience of customers. However, if a power quality event occurs, it is difficult for customers to determine its cause and solution because the systems do not provide appropriate power quality diagnosis functions. The power quality management system presented in this paper has been developed to provide customers with various power quality diagnosis functions so that they can cope well with power quality problems with the right measure in the right place. This paper presents the structure and functions of the developed power quality management system and shows some results of the power diagnosis functions.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.421-423
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• 2003

To prevent fault effect in supply of electric power distribution system and plan stable operation of electric power system, must control magnitude of fault current. Although there are various kinds of method to solvethis, approached from super conductivity Fault Current Limiter application viewpoint among them. High Temperature Superconductor-Fault Current Limiter (HTS-FCL) development is progressing according to HTS technology development, and system application is tried. For actual system application of such super conductivity FCL, so that can reflect special quality of actuality supply of electric power distribution system just as it is in this treatise supply of electric power system by two modelling do. Also, by simulation of HTS-FCL action and protection coordination with another equipment appliances, verified the effectiveness in supply of electric power system applying itself super conductivity FCL EMTDC dynamic characteristic model that is develope.