Open AccessInfluence of fan‐shaped non‐uniform pollution on the electrical property of typical type HVDC insulator and insulation selection
Author(s) -
Zhang Dongdong,
Zhang Zhijin,
Jiang Xingliang,
Zhang Wei,
Zhao Jiayao,
Bi Maoqiang
Publication year - 2016
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2016.0279
Subject(s) - insulator (electricity) , arc flash , pollution , voltage , electric power transmission , high voltage , materials science , transmission line , environmental science , residual , composite material , electrical engineering , structural engineering , engineering , computer science , ecology , algorithm , biology
Affected by long‐term crosswind, insulator surface will get coated with fan‐shaped non‐uniform pollution, which lowers insulator flashover voltage as previous study revealed. In this study, a further research in specific to HVDC line insulation is presented. Taking typical dc insulator as the sample, its dc flashover performance under fan‐shaped non‐uniform pollution was tested. Then the influence of that kind non‐uniformity was investigated through analysing the pollution layer residual resistance, the flashover process and critical flashover voltage. Finally the relevant HVDC insulation selection was made. Research results indicate that: under fan‐shaped non‐uniform pollution, insulator flashover voltage ( U 50 ) gets impaired, and is more obviously impaired by ratio J of windward to leeward side salt deposit density (SDD) than leeward side area proportion T ; under various T and J , there is still an exponential relationship between U 50 and SDD; under fan‐shaped non‐uniform pollution the pollution layer residual resistance decreases, which theoretically promotes the arc propagation and flashover process, and thus finally lowers flashover voltage; for the transmission line in area with fan‐shaped non‐uniform pollution, adding insulator units to strengthen the withstand property are needed.