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친환경 고전압 전력기기 개발을 위한 GN₂의 절연특성 분석
방승민(Seungmin Bang),이온유(Onyou Lee),김준일(Junil Kim),강종오(Jong O Kang),이홍석(Hongseok Lee),고태국(Taekuk Ko),강형구(Hyoungku Kang) 대한전기학회 2014 전기학회논문지 P Vol.63 No.4
The environmental pollution caused by green-house gases such as GN₂ has been becoming the main issue of industrial society. As a part of these efforts, 180 countries signed the Kyoto Protocol in 1997 to cut back on their green-house gas emissions [1]. Therefore, a study on the dielectric characteristics of the GN₂ is important for designing a eco-friendly high voltage apparatuses. In this paper, to develop an electrically reliable, stable, and eco-friendly high voltage apparatus, the breakdown voltage and partial discharge inception voltage characteristics in GN₂ considering utilization factors are studied for the establishment of insulation design criteria of an high voltage apparatus. Dielectric experiments are performed by using several kinds of sphere-plane electrode systems made of stainless steel. Also, the dielectric characteristics of the GN₂ are analyzed by using a Finite Elements Method ( FEM ) according to various field utilization factors. The results are expected to be applicable to designing the high voltage apparatuses using GN₂ as an insulation gas.
A Study on the Armature Reaction in a Superconducting Fluxpump
Ko,Taekuk,Oh,Yunsang 연세대학교 산업기술연구소 1989 논문집 Vol.21 No.1
The effective-inductance of a superconducting fluxpump is responsible for the drop of output voltage from the pump. The magnitude of this effect refered to as the "armature reaction" has been studied in this paper. It is shown that this reaction is a function of the current generated, the speed of rotation, and the shape of the magnetic poles used in the excitation of the pump. A few suggestions have been given for the construction of pumps with reduced armature reaction.