为有效解决输电线路风偏放电问题,对输电线路及金具进行绝缘包覆以提高放电击穿电压,仿真和试验研究了绝缘护套包覆对500 k V输电线路模拟杆塔中导线与塔身间空气间隙击穿特性的影响。试验过程中,对单导线及4分裂导线分别施加1 min 1.1...为有效解决输电线路风偏放电问题,对输电线路及金具进行绝缘包覆以提高放电击穿电压,仿真和试验研究了绝缘护套包覆对500 k V输电线路模拟杆塔中导线与塔身间空气间隙击穿特性的影响。试验过程中,对单导线及4分裂导线分别施加1 min 1.1倍工频相电压(318 k V),通过改变导线与杆塔间距研究不同间距下的耐压情况。仿真结果表明,导线包覆绝缘护套后,其表面最大场强随间距增大而降低;裸导线空气间隙击穿电压与间隙距离呈线性关系;单导线包覆绝缘护套后可缩短13.6%的间隙距离,4分裂导线包覆绝缘护套可缩短9.3%的间隙距离;击穿点均位于绝缘盒连接处,其原因是此处以室温硫化硅橡胶填补缝隙密封时施工密封不严。绝缘护套包覆导线及金具措施可有效提高输电线路导线与杆塔间空气间隙击穿特性,但应严格控制施工工艺以提高实际效果。展开更多
The SiO_2 nanoparticles were coated on the surface of graphene oxide(GO) by sol-gel method to get the SiO_2-G compound.The SiO_2-G was restored and oleophylically modified to prepare hydrophobic modified SiO_2-G(HM-Si...The SiO_2 nanoparticles were coated on the surface of graphene oxide(GO) by sol-gel method to get the SiO_2-G compound.The SiO_2-G was restored and oleophylically modified to prepare hydrophobic modified SiO_2-G(HM-SiO_2-G) which was subsequently added to silicone rubber matrix to prepare two-component room temperature vulcanized(RTV-2) thermal conductive silicone rubber. The morphology, chemical structure and dispersity of the modified graphene were characterized with SEM, FTIR, Raman, and XPS methods.In addition, the heat-resistance behavior, mechanical properties, thermal conductivity, and electrical conductivity of the RTV-2 silicone rubber were also studied systematically. The results showed that the SiO_2 nanoparticles were coated on graphene oxide successfully, and HM-SiO_2-G was uniformly dispersed in RTV-2 silicone rubber. The addition of HM-SiO_2-G could effectively improve the thermal stability, mechanical properties and thermal conductivity of RTV-2 silicone rubber and had no great influence on the electrical insulation performance.展开更多
文摘为有效解决输电线路风偏放电问题,对输电线路及金具进行绝缘包覆以提高放电击穿电压,仿真和试验研究了绝缘护套包覆对500 k V输电线路模拟杆塔中导线与塔身间空气间隙击穿特性的影响。试验过程中,对单导线及4分裂导线分别施加1 min 1.1倍工频相电压(318 k V),通过改变导线与杆塔间距研究不同间距下的耐压情况。仿真结果表明,导线包覆绝缘护套后,其表面最大场强随间距增大而降低;裸导线空气间隙击穿电压与间隙距离呈线性关系;单导线包覆绝缘护套后可缩短13.6%的间隙距离,4分裂导线包覆绝缘护套可缩短9.3%的间隙距离;击穿点均位于绝缘盒连接处,其原因是此处以室温硫化硅橡胶填补缝隙密封时施工密封不严。绝缘护套包覆导线及金具措施可有效提高输电线路导线与杆塔间空气间隙击穿特性,但应严格控制施工工艺以提高实际效果。
基金the Guangdong Province Science and Technology projects(No.2017A040402005)Guangdong Bureau of Quality and Technical Supervision Science and Technology projects(No.2017CT30)for financial support of this work
文摘The SiO_2 nanoparticles were coated on the surface of graphene oxide(GO) by sol-gel method to get the SiO_2-G compound.The SiO_2-G was restored and oleophylically modified to prepare hydrophobic modified SiO_2-G(HM-SiO_2-G) which was subsequently added to silicone rubber matrix to prepare two-component room temperature vulcanized(RTV-2) thermal conductive silicone rubber. The morphology, chemical structure and dispersity of the modified graphene were characterized with SEM, FTIR, Raman, and XPS methods.In addition, the heat-resistance behavior, mechanical properties, thermal conductivity, and electrical conductivity of the RTV-2 silicone rubber were also studied systematically. The results showed that the SiO_2 nanoparticles were coated on graphene oxide successfully, and HM-SiO_2-G was uniformly dispersed in RTV-2 silicone rubber. The addition of HM-SiO_2-G could effectively improve the thermal stability, mechanical properties and thermal conductivity of RTV-2 silicone rubber and had no great influence on the electrical insulation performance.
