Investigation into alternative solutions for HVDC station post insulators

In the design of HVDC stations, it is often necessary to look into possible alternative solutions for HVDC outdoor insulation which can lead to a reduction in the required insulator length and, at the same time, provide reliable pollution performance. Some laboratory investigations related to this subject are presented in this paper. Four well designed insulator shed profiles were tested. The effectiveness of booster sheds was tested under fog conditions. The insulator with its semiconducting glaze was tested in cold fog. The performances of the silicone grease and RTV coatings were compared under rain conditions