Research Project on the Gas Insulation Using a Gas Mixture

使用气体混合物进行气体绝缘的研究项目

• 批准号: 11450112
• 负责人: TAKUMA Tadasu
• 金额: $ 9.47万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450112/
• 关键词: gas insulation; SF_6 (sulphurhexafluoride); fluorocarbon gas; gas mixture; discharge characteristics; global warming effect; electric power equipment; substation equipment

SF_6 is widely used in important electric power systems such as gas-insulated switchgear (GIS). Recently, however, very high global warming potential (GWP) of SF_6 gas has become a very serious problem. This research project has proposed the "non-SF_6 (or SF_6-less) gas insulation" by substituting a gas mixture with PFC (perfluorocarbon) for SF_6. We have principally investigated the possibility of applying a gas mixture consisting of c-C_4F_8 (perfluorocyclobutan) and N_2 or CO_2.(1) We have derived the expression for the release rate or loss rate at the liquefaction recovery process of a gas mixture containing an electronegative gas. By applying this derivation, we have made clear that the release rate of c-C_4F_8 from c-C_4F_8 /N_2 is much lower than that of SF_6 from SF_6/N_2 at the same mixing ratio.(2) We have studied the insulation characteristics of c-C_4F_8 /N_2(or CO_2) in various conditions, and compared them with those of pure SF_6 and SF_6/N_2. Main experimental conditions … More are as follows :Gas pressure : 0.1〜0.4MPaApplied voltage : dc, 60Hz ac, lightning impulseMixingraito : 0, 5, 10, 20,100 %(vol %) of an electronegative gasIt has been shown that compared with SF_6/N_2, gas mixtures containing c-C_4F_8 have reasonably good insulation ability under quasi-homogeneous electric field conditions.Nonlinearity, or synergism, in discharge voltage relative to mixing ratio, increases with Pd (gas pressure x gap length) for gas mixtures containing c-C_4F_8.(3) Under extremely inhomogeneous conditions simulating sharp conducting particles in practice, the gas mixtures with c-C_4F_8 show almost equivalent insulation characteristics compared with SF_6/N_2. The ac sparkover voltage of c-C_4F_8 /N_2 is even higher at a pressure above 0.3MPa than that of pure SF_6.(4) We estimate that by applying a gas mixture with c-C_4F_8 having the insulation strength, comparable to pure SF_6, the GWP (global warming potential) can be reduced to less 10%. This value is about a half of the GWP in the case SF_6/N_2 is applied at the same mixing ratio. Less

SF_6广泛应用于气体绝缘开关(GIS)等重要电力系统。然而，近年来，SF_6气体极高的全球变暖潜势(GWP)已成为一个非常严重的问题。本研究项目提出了用PFC(全氟化碳)替代SF_6气体的“非SF_6(或无SF_6)气体绝缘”。我们主要研究了C-C_4F_8(全氟环丁烷)和N_2或CO_2混合气体应用的可能性。(1)推导了含有电负性气体的混合气体在液化恢复过程中的释放率或损失率的表达式。(2)研究了c-C_4F_8/N_2(或CO_2)在不同条件下的绝缘特性，并与纯SF_6和SF_6/N_2的绝缘特性进行了比较。主要实验条件…实验结果表明，与SF_6/N_2相比，含有C-C_4F_8的混合气体在准均匀电场条件下具有较好的绝缘能力。对于含有C-C_4F_8的混合气体，其放电电压相对于混合比的非线性或协同性随Pd(气体压力x间隙长度)的增加而增加。(3)在实际应用中，在模拟尖锐导电粒子的极不均匀条件下，与SF_6/N_2混合气体相比，C-C_4F_8混合气体表现出与SF_6/N_2基本相同的绝缘特性。在0.3 Mpa以上的压力下，C-C_4F_8/N_2的交流闪络电压甚至比纯SF_6的交流闪络电压还要高。(4)我们估计，采用具有与纯SF_6相当的绝缘强度的c-C_4F_8混合气体，可以将全球变暖潜势降低到10%以下。在SF_6/N_2混合比相同的情况下，该值约为GWP的一半。较少

项目成果

宅間 董: "混合ガスの火花電圧実験式"放電研究(放電学会誌). 44・1-2. 87-92 (2001)

Takuma Takuma：“混合气体的火花电压的实验公式”放电研究（放电学会杂志）44・1-2（2001）。

S. Hamada: "Possibility of gas mixtures containing c-C_4F_8 as a SF_6 substitute in gas insulation"Symp. on Gaseous Dielectrics IX. 301-306 (2001)

S. Hamada：“含有 c-C_4F_8 的气体混合物作为气体绝缘中的 SF_6 替代品的可能性”Symp。

O. Yamamoto: "Applying a gas mixture containing c-C_4F_8 as an insulation medium"IEEE Trans. on Dielectrics and Electrical, Insulation. Vol.8, No. 6. 1075-1081 (2001)

O. Yamamoto：“应用含有 c-C_4F_8 的气体混合物作为绝缘介质”IEEE Trans。

H.Yamada: "AC sparkover characteristics of gas mixtures containing c-C_4F_8"Proc. of 10th Asian Conf. on Electrical Discharge (ACED). 10・1. A114-1-A114-4 (2000)

H.Yamada：“含有 c-C_4F_8 的气体混合物的交流火花特性”第 10 届亚洲放电会议 (ACED) 10・1 (2000)。

H.Yamada: "AC Sparkover Characteristics of Gas Mixtures Containing c-C_4F_8"Proc. of 10th Asian Conf. on Electrical Discharge (ACED) . 10・1. A-114,1-4 (2000)

H.Yamada：“含有 c-C_4F_8 的气体混合物的交流火花放电特性”第 10 届亚洲放电会议 (ACED) 10・1 (2000)。