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배전용 변압기에서의 고온열화와 열 사이클 열화에 따른 식물유와 광유의 특성 분석
안정식(Jung-Sik An),최순호(Sun-Ho Choi),방정주(Jeong-Ju Bang),정중일(Joong-Il Jung),허창수(Chang-Su Huh) 대한전기학회 2011 전기학회논문지 Vol.60 No.6
Most transformers use insulating and cooling fluids derived from petroleum crude oil, but mineral oil has some possibility of environmental pollution and fire with explosion. vegetable oil fluids extracted from seed has superior biodegradation and fire-resistant properties including an exceptionally high fire point enhancing fire safety. In this study, it is aimed at the practicality of substituting natural ester dielectric fluid for mineral oil in liquid insulation system of transformers. As a rise in coil winding temperature has a direct influence on transformer life time, it is important to evaluate the temperature rise of coil winding in vegetable oil in comparison with mineral oil. Four transformers for the test are designed with 10KVA, 13.2㎸, one phase unit. The temperature are directly measured in insulating oil of these transformers with the two sorts of natural ester and mineral oil dielectric fluid respectively. Experiment for aging carry out two means. First means remained 120℃ that transformer of mineral oil were operated at 185% load. Second means is that insulating oils of two natural ester and mineral oil were aged by thermal cycles repeating from 30℃ to 120℃. For the heating, Transformers were operated at 185% load. For the cooling, cooling system was operated in the chamber. Samples were analyzed at 42, 63, 93, 143, 190, 240 300cycles. Analysis contents are dielectric strength, total acid value. Mineral oils compared results of first means with results of second means. And compared two sort natural esters respectively with mineral oil in second means.
절연 가스에 따른 초고속 Marx generator의 상승 시간 특성
두진석(Jin-Suk Doo),방정주(Jung-Ju Bang),김광용(Kwang-Yong Kim),황선묵(Sun-Mook Hwang),서유진(Yu-Jin Seo),허창수(Chang-Su Huh) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Recently, there has been considerable interest in electromagnetic pulse (EMP) source for no lethal directed energy weaponry applications. The compactness of the Marx generator, coupled with its ability to be powered by battery technology, makes it a viable handled impulse source. The marx generator has 2 stages. Each stage was constructed one charging capacitor, two electrodes and one charging resistor. A inductance structure is used in order to improve the switching performances fo the whole generator. The experiments of rise time in pure gas and mixtures of gases were described. The experimental results show that the rise time characteristics of the marx generator can be controlled through varying insulation gas.
고출력 임펄스 전압 측정을 위한 수저항 분압기 특성 연구
두진석(Jin-Suk Doo),한승문(Seung-moon),방정주(Jung-Ju Bang),장동관,이예나(Ye-Na Lee),허창수(Chang-Su Huh) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Accurate high voltage measurements are required by the electric power industry for instrumentation, metering, and testing applications. Similarly, there is a need for accurate measurements of high voltages in pulsed power machines to monitor and optimize machine operation. High-voltage, low-inductance resistor are commonly employed as fast voltage-divider probes, charging-trigger resistors in Marx generator, dummy loads for pulsed power systems, absorbers of reflected pulses, and energy dumps. Aqueous solution resistors have a number of advantage as compared to resistors of other type. Aqueous solution resistors are technically superior to wirewound, film, and composition resistors and less expensive than ceramic resistors.