SF_6因具有良好的绝缘效果而被广泛地应用于电力系统中。但同时,SF_6也是一种温室气体,随着环境问题日益恶化,人们迫切需要找到替代SF_6的绝缘气体。为此,通过实验研究了环境友好气体c-C_4F_8及c-C_4F_8/N_2混合气体替代SF_6的可行性。...SF_6因具有良好的绝缘效果而被广泛地应用于电力系统中。但同时,SF_6也是一种温室气体,随着环境问题日益恶化,人们迫切需要找到替代SF_6的绝缘气体。为此,通过实验研究了环境友好气体c-C_4F_8及c-C_4F_8/N_2混合气体替代SF_6的可行性。通过调节电极间隙(1~6 mm)和气压(150~350 k Pa),测量了气体在不同条件下的击穿电压及击穿电流波形,得到了气体的绝缘特性并与SF_6气体进行了对比分析。实验结果表明:纯净的c-C_4F_8气体的绝缘强度约为SF_6的1.3倍,体积比为1:1的c-C_4F_8/N_2混合气体的绝缘强度约为与SF_6的0.9倍。通过计算,c-C_4F_8/N_2混合气体的液化温度可以达到电力系统使用要求。考虑到c-C_4F_8气体对于环境的影响较小,使用c-C_4F_8/N_2混合气体作为替代SF_6的绝缘气体,有着良好的应用前景。展开更多
An improved Monte Carlo method was used to simulate the motion of electrons in c-C4F8 and SF6 gas mixtures for pulsed townsend discharge. The electron swarm parameters such as effective ionization coefficient, -↑α a...An improved Monte Carlo method was used to simulate the motion of electrons in c-C4F8 and SF6 gas mixtures for pulsed townsend discharge. The electron swarm parameters such as effective ionization coefficient, -↑α and drift velocity over the E/N range from 280～700 Td（1Td=10^-21 V·m^2） were calculated by employing a set of cross sections available in literature. From the variation cure of -↑α with SF6 partial pressure p, the limiting field （E/N）lim of gas mixture at different gas content was determined. It is found that the limiting field of c-C4F8 and SF6 gas mixture is higher than that of pure SF6 at any SF6 mixture ratio. Simulation results show excellent agreement with experiment data available in previous literature.展开更多
文摘SF_6因具有良好的绝缘效果而被广泛地应用于电力系统中。但同时,SF_6也是一种温室气体,随着环境问题日益恶化,人们迫切需要找到替代SF_6的绝缘气体。为此,通过实验研究了环境友好气体c-C_4F_8及c-C_4F_8/N_2混合气体替代SF_6的可行性。通过调节电极间隙(1~6 mm)和气压(150~350 k Pa),测量了气体在不同条件下的击穿电压及击穿电流波形,得到了气体的绝缘特性并与SF_6气体进行了对比分析。实验结果表明:纯净的c-C_4F_8气体的绝缘强度约为SF_6的1.3倍,体积比为1:1的c-C_4F_8/N_2混合气体的绝缘强度约为与SF_6的0.9倍。通过计算,c-C_4F_8/N_2混合气体的液化温度可以达到电力系统使用要求。考虑到c-C_4F_8气体对于环境的影响较小,使用c-C_4F_8/N_2混合气体作为替代SF_6的绝缘气体,有着良好的应用前景。
基金Supported by the Tai'an City Science and Technology Planning Program(No.2017NS0156)the High-School Scientific Research Development Program of Shandong Province(No.2016J16LL57)the Natural Scientific Foundation of Shandong Province(No.ZR2014CL011)~~
文摘An improved Monte Carlo method was used to simulate the motion of electrons in c-C4F8 and SF6 gas mixtures for pulsed townsend discharge. The electron swarm parameters such as effective ionization coefficient, -↑α and drift velocity over the E/N range from 280～700 Td（1Td=10^-21 V·m^2） were calculated by employing a set of cross sections available in literature. From the variation cure of -↑α with SF6 partial pressure p, the limiting field （E/N）lim of gas mixture at different gas content was determined. It is found that the limiting field of c-C4F8 and SF6 gas mixture is higher than that of pure SF6 at any SF6 mixture ratio. Simulation results show excellent agreement with experiment data available in previous literature.
