变压器油微秒脉冲放电的电液效应

IF 4.4 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
High Voltage Pub Date : 2025-01-21 DOI:10.1049/hve2.12519
Hang Wang, Cheng Zhang, Zhuofei Wang, Shuai Zhang, Kaihang Guo, Tao Shao
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引用次数: 0

摘要

变压器油微秒脉冲放电的物理过程是研究超高压变压器故障初始力学的基础。然而,变压器油中的微秒级电液效应尚未得到研究。本文利用高速相机纹影系统研究了变压器油中微秒脉冲放电在针状电极间产生的激波和气泡。结果表明:当流光和第一激波同时存在时,0.1 mm油隙内的放电通道在9.50µs内形成;电极之间的气泡在随后的218.50µs内膨胀。然后,当观察到第二波激波时,气泡破裂。第一波和第二波的速度分别为1388.16 m/s和1465.46 m/s。随着间隙距离的增大,所有击穿电压、放电能量、机械能与总能量的比值均增大,击穿电流、容器壁加速度、冲击波速度均减小。结果表明,第一波激波是由微秒脉冲放电流产生的,第二波激波是由气泡坍塌引起的密度快速变化引起的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Electrohydraulic effect of microsecond pulsed discharge in transformer oils

Electrohydraulic effect of microsecond pulsed discharge in transformer oils

The physical process of microsecond pulsed discharge in transformer oil is the foundation for studying the initial mechanics of faults in ultra-high voltage transformers. However, the microsecond-scale electrohydraulic effect in transformer oil has not been investigated yet. In this paper, the shock wave and bubble generated by microsecond pulsed discharge in transformer oil between needle-needle electrodes are studied using a Schlieren system with a high-speed camera. The results show that the discharge channel in the 0.1 mm oil gap forms in 9.50 µs when the streamer and the first shock wave are observed. The bubble between electrodes expands in the subsequent 218.50 µs. Then, the bubble collapses when the second shock wave is observed. The velocities of the first and the second shock wave are 1388.16 and 1465.46 m/s, respectively. With the gap distance increase, all the breakdown voltage, the discharge energy, and the ratio of the mechanical energy to total energy increase, the breakdown current, the acceleration of the container wall, and the velocity of the shock wave decrease. It can be concluded that the first shock wave is generated by the streamer of microsecond pulsed discharge and the second shock wave is induced by the rapid density change due to the bubble collapsing.

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来源期刊
High Voltage
High Voltage Energy-Energy Engineering and Power Technology
CiteScore
9.60
自引率
27.30%
发文量
97
审稿时长
21 weeks
期刊介绍: High Voltage aims to attract original research papers and review articles. The scope covers high-voltage power engineering and high voltage applications, including experimental, computational (including simulation and modelling) and theoretical studies, which include: Electrical Insulation ● Outdoor, indoor, solid, liquid and gas insulation ● Transient voltages and overvoltage protection ● Nano-dielectrics and new insulation materials ● Condition monitoring and maintenance Discharge and plasmas, pulsed power ● Electrical discharge, plasma generation and applications ● Interactions of plasma with surfaces ● Pulsed power science and technology High-field effects ● Computation, measurements of Intensive Electromagnetic Field ● Electromagnetic compatibility ● Biomedical effects ● Environmental effects and protection High Voltage Engineering ● Design problems, testing and measuring techniques ● Equipment development and asset management ● Smart Grid, live line working ● AC/DC power electronics ● UHV power transmission Special Issues. Call for papers: Interface Charging Phenomena for Dielectric Materials - https://digital-library.theiet.org/files/HVE_CFP_ICP.pdf Emerging Materials For High Voltage Applications - https://digital-library.theiet.org/files/HVE_CFP_EMHVA.pdf
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