Reliability Analysis of A Novel On-line Maintenance Switchgear Under Transient Impulse

• Published in: Procedia computer science Vol. 191; pp. 397 - 404
• Main Authors: Wang, Wei, Zeng, Guo-wei, Tang, Qi, Wu, Kun-tai, Huang, Qi-heng, Ma, Wen-yu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2021
• Subjects: Lightning surge strike; On-line maintenance; Switchgear; Switching progress; Transient impulse; Lightning surge strike; Switchgear; On-line maintenance; Switching progress; Transient impulse
• ISSN: 1877-0509; 1877-0509
• DOI: 10.1016/j.procs.2021.07.050

To improve the efficiency of switchgear maintenance, a double-action switchgear is presented to realize the purpose of on-line maintenance in this paper. And to check the reliability and safety of the novel design, a research about the insulation performance of the new design switchgear under two different impulse action is carried out. The two different impulse phenomena refer the switching process of the double-action switchgear and the lighting impulse respectively. The switchgear conversion equivalent circuit is established to analyze the transient process of the switching and the mechanism of lightning surge strike on the switchgear is analyzed as well. Based on these, an 3D electric field model is established to calculate the distribution of electric field under switchgear transient condition and the lightning impulse condition respectively. The results show that when the new switchgear operates under the condition of the maximum overvoltage during the switching progress, the maximum field strength is 4.35×105V/m, which is less than the air breakdown field strength. Under the extreme conditions of lightning surge strike, the maximum field strength in the main switchgear and stand-by switchgear is 1.415×107V/m and 5.093×106V/m respectively, where the breakdown may occur. Lightning arresters is quite necessary to be adopted to protect the new switchgear.