Pollution flashover performance of RTV coatings with partial damage. (October 2020)

• Record Type: Journal Article
• Authors: Li, Zong; Yin, Fanghui; Cao, Bin; Wang, Liming; Shao, Shichao; Farzaneh, Masoud
• Is Part Of: International journal of electrical power & energy systems. Volume 121(2020)
• Publication Date: 2020-10
• Subjects: Pollution flashover -- RTV coatings -- Partial damage -- Effective path; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2020.106102
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: The damage of location and lateral length have little influence on the flashover. The damage of longitudinal length was the major factor on the flashover. The "effective path" can be used to easily analyse the effect of multiple damages. The flashover voltage was in a linear relationship with the "effective path". Abstract: Under conditions of high temperature, high humidity, and strong ultraviolet radiation, RTV coating on the insulators may get aged, powdered and even peeled off. The physical damage of the RTV coating on the insulator surface can result in a reduction in the pollution flashover performance. Therefore, this study investigated the influence of location, lateral length, and longitudinal length of the damage on the pollution flashover voltage of RTV-coated insulators. From the experimental results, it was found that the longitudinal length of the damage along the creepage distance direction was the most influential factor on the pollution flashover voltage. According to the flashover voltage function obtained by fitting, the concept of "effective path" distance was proposed. This concept can be used to analyse the influence of multiple damages on the pollution flashover voltage. To validate the analysis, verification experiments were performed using typical industrial insulator. The results showed that the pollution flashover voltage of the insulator was also in a linear relationship with the proposed "effective path" distance, which confirmed the mechanism analysis.