SF 6 Partial Discharge Decomposition Characteristics Under Different Lengths of Wire-Type Metal Particles in Direct Curr
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ORIGINAL ARTICLE
SF6 Partial Discharge Decomposition Characteristics Under Different Lengths of Wire‑Type Metal Particles in Direct Current Gas Insulated Equipment Gang Wei1 · Zhengqin Cao1 · Yongjian Zhou2 · Yichun Bai1 · Ding‑Wen Hu3 Received: 28 May 2020 / Revised: 24 August 2020 / Accepted: 28 November 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Aiming at the serious defects of wire-type free metal particles, which can cause severe partial discharge (PD) in Direct current (DC) gas-insulated equipment, the experiments on the influence of four lengths (3.0, 5.0, 7.0, and 9.0 mm) of wiretype free metal materials on S F6 decomposition under DC PD were conducted. The formation rules of four characteristic decomposition components, namely, C F4, SOF2, SO2F2 and SO2, under different lengths of wire-type free metal particles, were determined using gas chromatography. Results showed that the amounts of four kinds of SF6 DC PD characteristic decomposition components are proportional to the length of wire-type free metal particles. The long length of wire-type free metal particles increases the intensity of PD and the amount and effective generation rates of SF6 DC PD characteristic decomposition components. All these findings provide an experimental basis for the diagnosis of insulation defect types in SF6 DC gas insulated equipment. Keywords Partial discharge · Wire-type free metal particles · DC · SF6 decomposition characteristic
1 Introduction SF6 has been widely used in electrical equipment, such as gas-insulated switchgear (GIS) [1–4], due to its excellent arc extinguishing performance and insulation characteristics [5]. The increasingly important role of ultra-high-voltage DC in power grids [6] has raised the demand for DC gas-insulated equipment [7]. Pollutants of free metal particles are inevitably produced in the process of the production, transportation, installation, and operation of gas insulation equipment due to equipment vibration, mechanical friction, collision, and other factors. Under high voltage, these free metal particles will move continuously and produce partial discharge (PD), resulting in a remarkably reduction in the withstand voltage of equipment and even insulation accidents [8–11]. The * Zhengqin Cao [email protected] 1
College of Electrical Engineering, Chongqing University of Science and Technology, Chongqing, China
2
State Grid Tianjin Electric Power Company, Tianjin, China
3
State Grid Chongqing Electric Power Company, Chongqing, China
method of SF6 gas insulated equipment condition monitoring and fault diagnosis based on the decomposed components analysis (DCA)have the advantages of remaining unaffected by electromagnetic interference, simultaneous diagnosis of discharge and partial overheating faults, and has become a focus of research [12–17]. Aiming at the research of free metal particles in S F6 gas insulated equipment, Li et al. [6], [18, 19] explored the movement, PD characteristics and influence factors of free metal p
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