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
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。
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.
