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평등전계에서 SF<sub>6</sub>/CF<sub>4</sub> 혼합가스의 AC절연내력 특성
황청호,박신우,김남렬,허창수,Hwang, Chung-Ho,Park, Woo-Shin,Kim, Nam-Ryul,Huh, Chang-Su 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.4
The excellent dielectric properties of $SF_6$(sulfur hexafluoride) have lead to its wide range of application in the field of high voltage insulation. Because there has been some recent concern regarding the environmental impacts of $SF_6$ binary gas mixtures, with $SF_6$ as the main component, have been the subject of active research. Scientists have long been interested in the possible use of gaseous fluorocarbons, including $CF_4$ (Carton Tetrafluoride), in high voltage applications due to their inert character and high dielectric strength. This paper presents experimental results concerning the AC breakdown characteristics lot various mixtures of $SF_6/CF_4$ in a test chamber and 25.8 kV GIS (Gas Insulation Switchgear) at practical pressures (0.1-04 MPa) and gap lengths (0.5 mm, 1 mm) in a test chamber. In the result, it was observed that an increase in the dielectric strength is attained through the addition of $SF_6$ to $CF_4$. It is possible to make an environment friendly gas insulation material while maintaining the dielectric strength by combing $SF_6$ and $CF_4$ which generates a lower level of the "global warming" effect.
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.
불평등 전계에서 표준 뇌 임펄스 전압의 SF. /CF₄ 혼합 가스의 절연 내력
허창수(Chang-Su Huh),성허경(Heo-Gyung Sung),박신우(Shin-Woo Park),황청호(Cheong-Ho Hwang),김남렬(Nam-Ryul Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
In these days SF. mixtures and alternative gas have been studied because of global warming and liquefying at low temperature and high pressure. At present work the breakdown characteristics of SF. /CF₄ mixture in non-uniform field was performed. The experiments were carried out under positive and negative standard lightning impulse (SLI) voltages. The point-plane electrode was used with 3 ㎜ gap distance in the test chamber. The SF. /CF₄ mixture which contain 20% of SF. was compared with pure SF. and CF₄ gas. Experimental gas pressure ranged from 0.1 to 0.4 ㎫. The breakdown voltage under negative SLI is higher than the breakdown voltage under positive voltage. And the breakdown voltage of SF. 20%, CF₄ 80% mixture is similar to that of pure SF. .