• The Transactions of The Korean Institute of Electrical Engineers
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• v.67 no.12
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• pp.1735-1742
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• 2018

The number of electric railway failures will increase due to the external and internal effects of electric railroads. The grounding test with 25,000V is to artificially test the transmission voltage to ground, and it is possible to cause risks of electric shock and other equipment insulation damage in neighboring enclosure. In 2016, method of fault localization changed to low - voltage at 380V from artificially high- voltage in the grounding tests since opening of Seoul Metropolitan Express Railway; The method is more accurate and safer rather than the previous one because it gets more data from unlimited grounding tests. However, an electric current falls on the track section where the track branches and vehicle bases with many lines. To precisely detect a transitive phenomenon, it is necessary to continuously study and additionally install.

• Progress in Superconductivity and Cryogenics
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• v.10 no.1
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• pp.48-51
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• 2008

The standardization on superconducting application techniques has been focused only in testing method or material itself, but, recently, it is actively proceeded by superconducting technical committee(TC) of international electro technical commission(IEC). In this paper, the standardization organization and its necessary process is introduced and the standardization technique for 22.9kV, 50MVA HTS power cable is prescribed. Throughout this research, it is possible to take priorities on the standardization technique in HTS power cable application. And moreover it can also contributes to the commercialization of HTS power cable.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.365-368
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• 2010

Full Electric Vehicle needs regenerative braking system by it's limitation of energy storage capacity. In this study, we suggest the system trade-off strategy between regenerative braking system with ultra capacitor and vichile enegry efficency. Simulation with the UDDS scheduling show the relations of energy storage sizing, efficiency of regenerative braking system and ultra capacitor sizing.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.54-56
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• 2005

IT(Information Technology) 기법을 전력계통 해석에 적용하는 것은 필수요건이 되었다. 그러나 IT 기술의 발 빠른 진화에 따른 전력기술자들의 기술력 적용은 쉽지 않다. 이와 같은 기술력 격차를 보완하기 위해서는 전력계통 해석기술과 IT 기술을 융합하는 방안이 필요하다. 본 연구에서는 IT 기술을 최대한 활용하여 전력기술 개발에 사용할 수 있는 방안을 전력계통해석의 근간이 되는 전력조류 문제에 적용하여 그 가능성을 검토하였다. 그 결과 전력계통 해석을 IT 플랫폼 기반에서 쉽게 구현할 수 있었다. 이 결과를 바탕으로 IT 기술에 대해 별반 전문 지식이 없는 전력계통 기술자도 쉽게 IT 기술을 활용할 수 있을 뿐 아니라, 유지 보수 문제도 쉽게 해결될 수 있다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.113-114
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• 2015

본 논문에서는 Beacon을 이용한 교통 요금 자동결제 시스템을 제안한다. 제안된 시스템은 특별한 행위 없이 사용자의 대중교통 이용 여부를 정확히 판단하여 자동으로 결제를 처리하기 때문에 편리하게 서비스를 이용할 수 있다. 특히, 승하차 시스템을 설계하기 위하여 필요한 알고리즘과 데이터 처리 과정을 제안하고 그 파급효과를 분석한다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.369-370
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• 2007

Recently IT technology is applying to various technology developments, namely telecommunication, operation technology and even power technology. When it applies to power technology, we call it Power IT. Now Power IT turns a new technology trends. Considering this background, in order to apply the IT technology to electrical construction technology and related equipments, the present state of domestic electrical construction and related technology were investigated and examined. This paper presents what electrical construction technology can be changed by IT technology, and how to conceptually plan to develop it

• Journal of the Korean Society for information Management
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• v.11 no.1
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• pp.57-79
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• 1994

This study investgated citation pattems of publication by researchers in eledncal and electronics engineering in Korea. As sources to derive citation$ Koran Peridcals Index (KPI) and the INSPEC database were seleded, and some 235 articles indexed in KPI and 189 arbcles indexed in INSPEC yielded 3,414 citations. It Identhd the citation behavior of researchers in the field, compared citabn behavior by author affhation (government, universities, and industry/cnmprues), and compared the catation patterns exhibited by articles taken from Kroean and non- Korean publications. Based on the fin-, it was concluded that the citation analysis results could ydd helpful information for the provision of library and information center services and collection development. It a h provided recommendation for the mformation senrim in the field of electrical and electronics engineering.

• Electrical & Electronic Materials
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• v.10 no.5
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• pp.473-480
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• 1997

Surface passivation using glass powders results in good reliability for high voltage silicon power devices. In this paper Zinc borosilicate glass and Lead borosilicate glass were prepared for the purpose of passivating, and a deposition technique of glass films on the silicon surface by electrophoresis in which acetone is used as a suspension medium has been investigated. Their physical properties were compared using DTA, SEM, XRD, as a function of firing temperature, I can get the fine films of 22${\mu}{\textrm}{m}$ thickness with Lead borosilicate glass under 300 volts applied, 3 minutes and $700^{\circ}C$ firing temperature. Also I can get the fine films of 17${\mu}{\textrm}{m}$ thickness with Zinc borosilicate glass under same conditions. As a result of investigation of glass films from which glass layer was removed by placing it in HCl, it has been found that pre-firing and annealing play an important role to achieve uniform and fine glass deposition films. And also it was found that relative dielectric constant is independence of frequency.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.6
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• pp.271-277
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• 2003

It is important to control layer current distributions of coaxial multi-layer HTS cables, because a homogeneous layer current distribution decreases AC loss and can supply the largest operational current. We have extended the theory that treat the operational current more than the critical current by considering V-I nonlinear characteristics of HTS tapes including flux flow resistance and contacting resistance between the cable and terminals. It is important to investigate the current distribution under the condition of operational current more than the critical current of cable, because the cable has experiences of fault current. In order to verify the extended theory, we have fabricated a two layers cable with the same twisting layer pitch. It was observed that almost all the operational current less than the critical current flowed on the outer layer because of its lower inductance. In case of operational current more than critical currents of layers, the flux flow resistances affect strongly current waveform and thereby the currents of layers were determined by the flux flow resistances. And we investigated breakdown characteristics in $LN_{2}$/paper composite insulation system for the application to a HTS cable. In this experiment, we got some information out of that the electrical characteristics of the insulation materials depends on the condition of butt gap.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.10
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• pp.21-28
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• 2009

Power capacitor has been used to compensate for the low power factor of inductive load and to reduce harmonics generated by the power conversion device with reactor. Power quality is mainly referred to the voltage quality and it is very important for the stable operation of load. But if voltage rms is temporary changed, it acts on capacitor as an electrical stress. In this paper, we analyzed that capacitor can be given by voltage, current and capacity's variance under the sag and swell condition. If reactor is connected at capacitor, sag can be aside from the question. But it can act an amount of stress on capacitor in the swell region.