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고희석(Hee-Seog Koh),김성삼(Sung-Sam Kim),이현무(Hyun-Moo Lee),김주찬(Ju-Chan Kim),류희석(Hee-Suk Ryoo) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
This paper presents the result of survey of case study for Harmonics in electrical Installations of buildings. Recently, many power electronic equipments(power converter, computers, air conditioners electronic ballasts for fluorescent lamps and so on) are used in office buildings, and harmonic current from them influence the other equipments in a distribution line. Notably, voltage distortion or voltage harmonics may approach or exceed is allowable level in power distribution system. Individual electric power consumers and end-users and responsible for reducing current harmonics while companies or utilities are responsible for reducing voltage harmonics at the point of common coupling in distribution system. As for harmonics, which one of the electric power qualities, it becomes important to obtain harmonic voltage/current distribution of the power system precisely because the use of power electronic apparatus in increasing. However, there are some difficulties on evaluating the measured data in comparison with the simulated result. The primary cause was indentitied with the resonance of harmonics form many sources. To suppress harmonics in electrical installations of buildings, one of many methods suggest that resonance frequencies are controlled by modulating the capacities of high-voltage customer"s capacitors.
고희석(Hee-Seog Koh),최종규(Jong-Kyu Chol),류희석(Hee-Suk Ryoo),김주찬(Ju-Chan Kim) 한국조명·전기설비학회 2002 한국조명·전기설비학회 학술대회논문집 Vol.2002 No.-
For accuracy of an experiment, measure changing of grounding resistance by short period after construction and investigated the efficiency of grounding"s different methode of parallel connection. We could confirm on measurement"s accuracy error through comparing the theoretical value and measured value. Therefore, reduction ratio can be expected from execution measurement to receive a target resistance value. By the result, we could evaluate the method of rod grounding electrode"s proper execution.