Open AccessInfluence of pollution chemical components on AC flashover performance of various types of insulators
Author(s) -
Yang Zhongyi,
Jiang Xingliang,
Han Xingbo,
Zhang Zhijin,
Hu Jianlin
Publication year - 2019
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve.2018.5083
Subject(s) - arc flash , insulator (electricity) , silicone rubber , materials science , pollution , composite material , contamination , dissolution , natural rubber , chemical engineering , engineering , ecology , biology
The pollution on insulators is composed of various chemical components, which threaten the stability of external insulation. However, the existing insulation designs have not taken this issue into consideration. This work aimed to study the influence of pollution chemical components on flashover performance of insulators with various materials. Flashover tests of porcelain, glass and silicone rubber insulators polluted by eight types of common contaminants were conducted. Based on the test data, the influence of chemical components and their solubility on equivalent salt deposit density (ESDD) and insulator flashover performance were analysed; and the electrical properties of different types of insulators were compared. Results show that the ESDD contribution rate changes with chemical components. The dissolution characteristic has a significant influence on the measurement of ESDD; slightly soluble contaminants need to be considered separately. The corresponding insulator flashover gradient for ions can be summarised as Cl − < NO 3 − < SO 4 2− , K + < Na + , NH 4 + < Ca 2+ . For a glass insulator, the flashover gradient is 4.9–17.0% higher than that of a porcelain insulator. For a silicone rubber insulator, this gap reaches 14.6–24.4 and 83.3–90% for freely soluble pollution and CaSO 4 , respectively, this phenomenon can be explained by the combined action of the slightly soluble character of CaSO 4 and hydrophobicity transference of silicone rubber.