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식물성 절연유와 광유가 사용된 유입변압기의 온도분포 특성
안정식(Jung-Sik An),심명섭(Meoung-Seop Shim),정중일(Joong-Il Jung),김남렬(Nam-Ryul Kim),허창수(Chang-Su Huh) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Most transformer use insulating and cooling fluids derived from petroleum crude oil, but mineral oil is 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. Three transformers for the test are designed with 10㎸A, 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. Temperature of vegetable oil transformers was similar to temperature of mineral oil transformer in the same design at 80% load and above.
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.
가속 열 열화에 따른 환경친화형 변압기 절연물의 전기적-기계적 특성 분석
심명섭(Myeong-Seop Shim),안정식(Jung-Sik An),최순호(Sun-Ho Choi),정중일(Jung-Il Jeong),이태호(Tae-Ho Lee),허창수(Chang-Su Huh) 대한전기학회 2010 전기학회논문지 Vol.59 No.10
Aging of transformer insulating material in natural ester insulating oil is compared to that in conventional transformer oil. Aging of insulating paper and insulating oil have been studied by performing accelerated thermal aging test. Sealed aging test vessels containing cooper, laminated core, Kraft paper and insulating oil(natural oil or mineral oil) were aged at 140℃ for 500, 1000, 1500 and 2000 hours. Insulating oils after aging are investigated with total acid number, breakdown voltage and viscosity. Also, degradation of insulating paper after aging is determined using breakdown voltage and mechanical strength. Accelerated aging studies demonstrate a slower aging rate for natural ester insulating oil compared to the rate for conventional mineral oil.
심명섭(Meoung-Seop Shim),안정식(Jung-Sik An),최순호(Sun-Ho Choi),정중일(Joong-Il Jung),김남렬,허창수(Chang-Su Huh) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Aging of transformer insulating material in natural ester insulating oil is compared to that in conventional transformer oil. Aging of insulating paper and insulating oil have been studied by performing accelerated thermal aging test. Sealed aging test vessels containing cooper, laminated core, Kraft paper and insulating oil(natural oil or mineral oil) were aged at 140℃ for 500, 1000, 1500 hours. Degradation of insulating paper after aging is determined using mechanical strength. Also, insulating oils after aging are investigated with breakdown voltage. Accelerated aging studies demonstrate a slower aging rate for natural ester insulating oil compared to the rate for conventional mineral oil.
준평등전계에서 SF?/CF₄ 혼합가스의 절연 파괴 전압 및 임계전계 특성
이병택(Byung-Taek Lee),황청호(Cheong-Ho Hwang),안정식(Jung-Sik An),허창수(Chang-Su Huh) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
SF? is the most commonly used insulating gas in electrical systems. But In these days SF? mixtures and alternative gas has been studied because of global warming. so although many studies have been carried out about binary gas mixtures with SF?, few studies were presented about breakdown characteristics of SF?/CF₄ mixtures. At present study the breakdown characteristics of SF?/CF₄ mixtures in quasi-uniform field was performed. This experiments were carried out under AC voltages. The rod-rod electrode was used with 5 ㎜ gap distance. The mixture of SF?/CF4 containing 20%,50%,70% of SF? were compared with pure SF? and CF₄ gas and gas pressure ranged from 0.1 to 0.5 ㎫. The show that the breakdown voltages of gas were linearly increased according to the pressure in quasi-uniform field. For breakdown vlotage values of (E/P)<SUB>crit</SUB> are important. Because If values of (E/P) is a little more than (E/P)<SUB>crit</SUB>, electrons rapidly increase and streamer discharge gernerates. Through this experiments values of (E/P)<SUB>crit</SUB> are found to vary with the ratio of SF?/CF₄ mixture according to the following relationship.
열화된 식물성 절연유의 벤조트리아졸과 온도의 유동대전 영향
최순호(Sun-Ho Choi),심명섭(Meoung-Seop Shim),안정식(Jung-Sik An),정중일(Joong-Il Jung),서유진(Yu-Jin Seo),허창수(Chang-Su Huh) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
In this paper, the experiments about streaming electrification of mineral and vegetable oils in transformers was performed. The effects that temperature, quantity of Benzotriazole (anti-electrification agent), degree of aging affect streaming electrificaton were investigated. The type of series electrification system was selected to make its analysis easy. Mineral oils represented a maximum value at 40℃ and Vegetable oils did at 60℃. Variations of the streaming electrification by quantity of Benzotriazole were similar regardless of a sort of oils. The effects of aging time of oils were small.