标题：Experimental Study of Multiple-Reignition Features of Secondary Arcs on EHV/UHV Transmission Lines
作者：Liu, Hongshun; Li, Runchang; He, Dongxin; Wei, Jianchun; Li, Qingquan
作者机构：[Liu, Hongshun; Li, Runchang; He, Dongxin; Wei, Jianchun; Li, Qingquan] Shandong Univ, Shandong Prov Key Lab UHV Transmiss Technol & Equ, Sch Elect En 更多
通讯作者：Liu, Hongshun;Liu, HS
通讯作者地址：[Liu, HS]Shandong Univ, Shandong Prov Key Lab UHV Transmiss Technol & Equ, Sch Elect Engn, Jinan 250061, Shandong, Peoples R China.
来源：IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
关键词：Extinction mechanism; multiple-reignition feature; secondary arc;; single-phase-to-ground fault; volt-ampere characteristic
摘要：When a single-phase-to-ground fault occurs in a power system, a secondary arc will normally be generated at the fault position after the fault phase has been interrupted. A detailed investigation of multiple-reignition features of secondary arcs on extra-high-voltage/ultra-highvoltage transmission lines is, therefore, very important. In this paper, an experimental setup for generating a secondary arc across a transmission-line insulator string is presented, and both the discharge waveforms and images are synchronously recorded. According to the properties of the discharge waveforms, the discharge process is divided into two stages and each stage is analyzed. The evolution of the volt-ampere characteristic and the resistance-current curve of the secondary arc is found to exhibit hysteresis during the discharge process. Multiple-reignition images of the secondary arcs are converted into binary images using image threshold processing. The arc length and breakdown voltage are discussed in association with the discharge images. Morphological changes in the secondary arc during a single discharge process are analyzed in terms of self-magnetic compression theory, and the extinction mechanism of the arc discharge is discussed on the basis of two theoretical approaches.