Mechanism and Experimental Study on Insulation Defect Discharge of Transmission Line

2019 4th Asia Conference on Power and Electrical Engineering

能源学;电工学

Liu, Zhenyao^1 ; Gao, Song^2 ; Jiang, Haibo^3 ; Guo, Rong^1 ; Kang, Yubin^1 ; Chen, Xuan^1

State Grid Jiangsu Electric Power Company Maintenance Branch, Nanjing

211102, China^1

State Grid Jiangsu Electric Power Company Electric Power Research Institute, Nanjing

211102, China^2

State Grid Jiangsu Electric Power Co., Ltd, Nanjing

211102, China^3

关键词: Discharge characteristics;    Flashover faults;    Floating discharges;    High-frequency current;    High-frequency discharges;    Insulation defects;    Laboratory environment;    Pollution discharges;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/486/1/012128/pdf
DOI  :  10.1088/1757-899X/486/1/012128

来源: IOP

【 摘 要 】

Common faults on transmission lines, such as insulator pollution flashover, trees flashover, string breakage failure of insulator will undergo a period of discharge before the occurrence of flashover, which is called insulation defect discharge. In this paper, the process of discharge such as floating discharge, insulator pollution discharge and tree discharge is simulated in the laboratory environment and the high frequency current waveform is monitored. The results show that insulation defect discharge will maintain a long period of time and will not immediately form a flashover fault, in addition, a great deal of high frequency discharge current pulses will be generated during this period. The discharge characteristics and the discharge pulses generated by different type of insulation defect discharge are quite different. Frequency of floating discharge current waveform are very high, while the pulse cluster of pollution discharge is dense, and the current waveform generated by tree discharge has notable dispersity. With the degree of discharge increasing, the parameters such as pulse repetition rate and discharge amount are gradually increasing.