(1 State Grid Zhejiang Electric Power Co.,Ltd. Hangzhou Yuhang District Power Supply Company, Hangzhou 311100, China;
2 State Grid Zhejiang Electric Power Co.,Ltd. Electric Power Research Institute, Hangzhou 310014, China;
3 State Grid Zhejiang Electric Power Co.,Ltd. Zhoushan Power Supply Company, Zhoushan 316021, China;
4 School of Intelligent Manufacturing, Taizhou University, Taizhou 318000, China)
Abstract: In complex outdoor working environments, especially on transmission lines in the southern coastal areas, due to factors such as contamination and creepage, high temperature and humidity, and aging of the sheath, some composite insulators have defects such as surface contamination, hardening and embrittlement of the umbrella skirt, and damage to the sheath. In this paper, based on two insulator breakdown events that occurred on adjacent towers of the same 110 kV transmission line, the line insulators were subject to appearance inspection, hydrophobicity test, salt density test, water diffusion test, tracking resistance test and profile inspection.The causes of discharge flashover and breakdown process of the composite insulators were analyzed. The results show that both composite insulators are in a coastal salt spray environment,the resistance of the sheath material to leakage tracking decreases. Under the action of surface leakage current, electrical erosion gradually occurs, damaging the sheath and exposing the core rod. With the passage of time, the defect length increases, eventually leading to breakdown. The operation and maintenance opinions for the subsequent composite insulators of coastal transmission lines were provided.
Key words: composite insulator; interface breakdown; discharge flashover; coastal transmission line; salt spray environment
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