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Yuanji CAI (蔡元纪), Yonggang GUAN (关永刚), Weidong LIU (刘卫东). Statistical characteristics of transient enclosure voltage in ultra-high-voltage gas-insulated switchgear[J]. Plasma Science and Technology, 2017, 19(6): 64011-064011. DOI: 10.1088/2058-6272/aa65c7
Citation: Yuanji CAI (蔡元纪), Yonggang GUAN (关永刚), Weidong LIU (刘卫东). Statistical characteristics of transient enclosure voltage in ultra-high-voltage gas-insulated switchgear[J]. Plasma Science and Technology, 2017, 19(6): 64011-064011. DOI: 10.1088/2058-6272/aa65c7

Statistical characteristics of transient enclosure voltage in ultra-high-voltage gas-insulated switchgear

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  • Transient enclosure voltage (TEV), which is a phenomenon induced by the inner dielectric breakdown of SF6 during disconnector operations in a gas-insulated switchgear (GIS), may cause issues relating to shock hazard and electromagnetic interference to secondary equipment.This is a critical factor regarding the electromagnetic compatibility of ultra-high-voltage (UHV)substations. In this paper, the statistical characteristics of TEV at UHV level are collected from field experiments, and are analyzed and compared to those from a repeated strike process. The TEV waveforms during disconnector operations are recorded by a self-developed measurement system first. Then, statistical characteristics, such as the pulse number, duration of pulses,frequency components, magnitude and single pulse duration, are extracted. The transmission line theory is introduced to analyze the TEV and is validated by the experimental results. Finally,the relationship between the TEV and the repeated strike process is analyzed. This proves that the pulse voltage of the TEV is proportional to the corresponding breakdown voltage. The results contribute to the definition of the standard testing waveform of the TEV, and can aid the protection of electronic devices in substations by minimizing the threat of this phenomenon.
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