为了提高±1 100 kV特高压直流换流站外绝缘的安全性和可靠性，研究了±1 100 kV特高压直流支柱绝缘子的空气间隙外绝缘、污秽和机械强度等关键技术问题。根据±1 100 kV特高压直流支柱绝缘子技术参数，结合±800 kV特高压直流支柱绝缘子设计，提出了±1 100 kV特高压直流支柱绝缘子技术难题的解决方法，以期为±1 100 kV直流支柱绝缘子提供设计依据，为工程的建设和运行提供技术支撑。

In order to improve the safety and reliability of external insulation for ± 1 100 kV UHV DC converter station, this paper studied several key technologies of post insulator for ±1 100 kV UHV DC, such as air gap external insulation, pollution, mechanical strength and so on. According to the technical parameters of ±1 100 kV UHV DC post insulator, the solution for those technical problems was proposed, combined with the design of ±800 kV UHV DC post insulator. The results could provide design basis for ±1 100 kV UHV DC post insulator, and technical support for the project construction and operation.