Abstract
Insulator contamination directly threatens the safe and stable operation of the overhead line. Through spatial electric field monitoring, it is expected to realize insulator pollution condition monitoring and contamination flashover warning in a non-contact way. So in this paper, the spatial electric field distribution characteristics of 110 kV composite insulators are simulated, where the effects of different surface states and their discharge levels on the spatial electric field of insulators are analyzed. On this basis, a non-contact monitoring method for composite insulator pollution based on the spatial electric field is proposed. The results show that there are significant differences in the spatial electric field of the composite insulator among three conditions of clean, pollution layer wetting, and dry band arcing. With the increase of pollution layer wetting and dry band arcing, it would lead to an increase of the amplitude of the spatial electric field of the insulator. It is feasible to identify the degree of pollution layer wetting as well as dry band arcing of the insulator string, by fixed-point monitoring the spatial electric field signal at the cross-strand of d = 0.5 m and directly opposite the last three positions. Research results can provide references for the online monitoring of overhead line pollution insulators and its flashover warning.
Highlights
Compared with the traditional string of porcelain and glass insulators, composite insulators, with excellent electrical and mechanical properties, are widely accepted in high-voltage power transmission systems
It can be seen from the data in the table that under different contaminated insulator surface conditions, the change characteristics of the spatial electric field signal were more obvious than the leakage current
It is feasible to realize pollution flashover warning by monitoring the spatial electric field signal through a non-contact manner
Summary
Compared with the traditional string of porcelain and glass insulators, composite insulators, with excellent electrical and mechanical properties, are widely accepted in high-voltage power transmission systems. The authors in [20] simulated the microscopic development process of the local arc of the pollution flashover and proposed the influence of different pollution distribution conditions and the salt density conductivity of different pollution layers on the local potential and electric field distribution of composite insulators. The above research did not compare the electric field distribution characteristics of the insulators under different surface conditions in order to obtain the relationship between the changes of insulator spatial electric field and its surface pollution conditions, which can provide theoretical support for non-contact pollution insulator condition monitoring and the provision of a pollution flashover warning. The research results can provide a reference for non-contact monitoring and pollution flashover early warning of the external pollution insulation of the power system
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