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Fundamental research for applying post SF_6 gas insulation concept to electric power apparatus with low environmental load

后SF_6气体绝缘理念应用于低环境负荷电力设备的基础研究

基本信息

批准号：
13305019
负责人：
HIDAKA Kunihiko
金额：
$ 35.86万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13305019/
关键词：
gas insulation low environmental load SF_6 gas CF_3I gas air N_2 gas V-t characteristics cryogenic temperature 電力機器混合ガス絶縁破壊電圧 N_2混合ガス方形波パルス極低温窒素ガス極低温空気

项目摘要

We have newly introduced a steep-front square voltage generator, which realizes a rise time of 16 ns and a peak value of 200 kV, and investigate gaseous discharge characteristics in nanosecond range focusing the probability distributions of breakdown and sparkover voltage and time lag characteristics including VFTO problems.SF6 gas, which is the main insulating medium in most electrical power apparatuses, has high greenhouse effect and the substitute with lower environmental effect are expected. We have investigated the discharge characteristics of environmentally friendly gases such as SF6-N2 gas mixture, CF3I, Air and nitrogen gas.It is already known that the breakdown voltages in SF6-N2 gas mixtures have synergistic effect against the mixture ratio. We have clarified that the effect is established even in very short time range around 10 ns by using the steep-front square voltage generator. CF3I gas has 1.2 times as high dielectric strength as SF6 gas under the same condition. Although CF3I gas has a weak point that the liquefying temperature is rather high, it can be overcome by mixing with other gases to lower the partial pressure.Air and nitrogen gas, which has completely no influence on the environment, has about a third dielectric strength as compared to SF6 gas. It is, however, possible to increase the dielectric strength keeping the same pressure by cooling. At the liquid nitrogen temperature, the dielectric strength becomes 3.8 times higher than that of room temperature if keeping the same pressure. This is equivalent to SF6 gas at room temperature and the same pressure.

介绍了一种前沿陡峭的正方形电压发生器，该发生器的上升沿时间为16 ns，峰值为200 kV，研究了气体在纳秒范围内的放电特性，重点研究了击穿和闪络电压的概率分布以及包括VFTO问题在内的时间滞后特性。SF6气体作为大多数电力设备的主要绝缘介质，具有很高的温室效应，有望成为环境影响较小的替代品。我们研究了SF6-N2混合气体、CF3I、空气和氮气等环境友好气体的放电特性，已知SF6-N2混合气体中的击穿电压与混合比具有协同效应。我们已经阐明，即使在10 ns左右的很短的时间范围内，使用陡峭的正方形电压发生器也可以建立这种效应。在相同条件下，CF3I气体的介电强度是SF6气体的1.2倍。虽然CF3I气体具有液化温度较高的缺点，但可以通过与其他气体混合来降低分压来克服这一缺点。空气和氮气对环境完全没有影响，与SF6气体相比，其介电强度约为SF6气体的三分之一。然而，可以通过冷却来增加保持相同压力的介电强度。在液氮温度下，如果保持相同的压力，介电强度是室温的3.8倍。这相当于在室温和相同压力下的SF6气体。