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주상변압기 적용을 위한 친환경 식물성절연유의 절연특성 연구
곽동순 한국안전학회 2010 한국안전학회지 Vol.25 No.6
In recent years, environmental concerns have been raised on the use of poorly biodegradable fluids in electrical apparatus in regions where spills from leaks and equipment failure could contaminate the surroundings. The vegetable insulation oils are highly biodegradable, have negligible effect on the environment, human health and ecosystem. Therefore, to assure their safe use in electrical power systems, it may require some processing and modification to improve some of their physical, chemical, thermal and electrical properties. This paper provides a comparative results of the electrical breakdown properties of several vegetable insulation oils and mineral oil to use as dielectric fluid in environmental-friendly pole transformer. Also, the electrical breakdown property of the Nomex and kraft insulation papers in vegetable insulation oil is examined.
곽동순,김상현,천현권,최재형 한국초전도.저온공학회 2006 한국초전도저온공학회논문지 Vol.8 No.2
A research on several characteristics such as volume breakdown and surface discharge of insulators for a termination of power transmission class HTS cable was performed. We investigated the surface discharge of glass fiber reinforced plastic (GFRP) under air, cryogenic nitrogen gas and nitrogen gas media. The breakdown characteristics of these media were studied. Experimental results revealed that flashover voltage greatly depends on pressure, temperature, the kinds of insulating media and voltages, but it is slightly affected by shape and material of electrode. The breakdown voltage of liquid nitrogen, cryogenic nitrogen gas and nitrogen gas deeply depends on the shape and dimension of electrode, kinds of voltages and pressure. Moreover, the breakdown voltage of cryogenic nitrogen gas and flashover voltage of GFRP in the cryogenic nitrogen gas is also influenced by temperature and vapour-mist density of the gas.
고온초전도 케이블의 절연파괴 특성에 미치는 Butt gap의 영향
곽동순,김영석,김해종,조전욱,김상현 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.3
For an electrical insulation design of HTS cable, it is important to understand the dielectric characteristics of insulation materials in L$N_2$ and the insulation type. Generally, the electrical insulation of HTS Cable is classified into two types of the composite insulation and solid insulation type. In this research, we selected the insulation paper/L$N_2$ composite insulation type for the electric insulation of a HTS cable, and studied electric insulation characteristics of synthetic Laminated Polypropylene Paper(LPP) in liquid nitrogen(L$N_2$) for the application to high temperature superconducting(HTS) cable. Furthermore, we compared the breakdown characteristics of the butt gap and bended mini-model cable. It is necessary to understand the winding parameter of insulation paper/LN2 composite insulation.
프랑스 고전 오르간음악 (1650-1790)의 연주법에 관한 연구
곽동순 연세대학교 음악연구소 1992 음악이론포럼 Vol.2 No.-
The organ, more than any other musical instrument, has assimilated numerous changes and experiments. A number of distinct national styles evolved throughout the history of organ music, spanning almost 2000 years. The classical French organ music, roughly between about 1650 and 1790, and the French organs of that period have developed a unique relationship. The musical textures were perfectly molded to the indigenous characteristics of specified combinations of stops. By 1650, French organ composers had accepted the new musical style which established registration practices for specific musical types on the organs whose specifications had become rather standardized throughout France. Organ music of this period in France became confined to forms which were used by all French organ composers of this period. Registration indications became titles for the pieces. It is fourtunate that many composers of this period wrote detailed instructions, perhaps the most thoroughgoing of any epoch, in the prefaces which they included in their collections of organ music. These instructions provide us with a valuable informations on the interpretation of their music. The organs of our country bear practically no resemblance to the French classical instruments. Therefore, the French organ music was seldom performed and studied. The purpose of this study is to understand the language of this particular style of organ and the performance practice of their music, apply this information to present day organs of our country and help the performers to express the composers' intentions fully in their performances. This study is consisted of observations on French classical organ building, organ music literature, performance practice(registration, Notes Ine´gales, articulation and ornamentation) and finally, an analysis of Francois Couperin's Messe a` l'usage des Convents, a typical work of the French classical organ music.