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인덕턴스의 국가 표준 확입을 위한 막스웰-윈 브릿지 연구 개발
이래덕,도재홍,김창석,Lee, Rae-Deok,Do, Jae-Hong,Kim, Chang-Seok 대한전자공학회 1983 전자공학회지 Vol.20 No.4
It is very difficult to measure inductance more accurately than 0.1% by the general AC bridges. A Maxwell-Wien bridge system has been developed for establishment and propagation of the national inductance standards. In results of its capability analysis, the accuracy of this bridge system was obtained up to ${\pm}$200 ppm for the present. 일반적인 교류 브릿지를 이용하여 인덕턴스를 0.1% 이상의 정확도로 측정한다는 것은 대단히 어려운 일이다. 따라서 인덕턱스의 표준을 설정하고 이에 대한 표준 공급을 가능케하기 위해서 막스웰 ―윈 브릿지 시스템을 개발하였다. 브릿지 시스템의 성능을 분석한 결과, 현재 ±200ppm의 정확도로 인덕턴스의 측정이 가능케 되었다.
크로스 커패시턴스를 이용한 발전기 고정자 권선 절연물 흡습 측정 센서
배용채(Yong-Chae Bae),김희수(Hee-Soo Kim),이두영(Doo-Young Lee),이욱륜(Wook-Ryun Lee),이래덕(Rae-Deok Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.10
The mechanical integrity of generator stator windings is one of the critical point because the electric power is generated and conducted to power system through these windings. To cool down the heat emitted from generator winding during its operation, a majority of generators use de-mineralized water characterized by high cooling efficiency. Contrary to such the excellent cooling efficiency, however, the damaged bar insulations attributed to the absorption of cooling water in the generator stator winding lead to highly time- and cost consuming efforts as well as to service deterioration due to unexpected forced outage of generator. It is described that the new design of water absorption sensor using cross capacitance for generator in power plant in order to increase the reliability of water absorption diagnostics for generator stator bar insulation.