邓军,潘志城,周海滨,朱光亚
DENG Jun,PAN Zhicheng,ZHOU Haibin,ZHU Guangya

• 1:中国南方电网有限责任公司超高压输电公司电力科研院
• 2:四川大学电气工程学院

摘要(Abstract)：

高压直流套管因内外部因素引发的击穿放电及沿面闪络问题已严重威胁特高压直流输电工程的安全稳定运行。为研究直流套管胶浸纸绝缘在内外部多因素影响下的沿面放电特性，通过搭建直流套管胶浸纸绝缘试样沿面放电试验系统，分析了高压直流套管内部绝缘缺陷下的放电行为，探究了金属微粒附着、表面粗糙度、气压、试样尺寸及湿度对胶浸纸绝缘沿面放电的影响规律与作用机制。试验结果表明：金属微粒的存在、表面粗糙度的增加、湿度的升高及试样尺寸的增大均会显著降低闪络场强，而涂层与二次干燥可小幅改善绝缘性能。气固界面电场畸变和表面电荷积聚是影响沿面放电过程的关键因素，金属微粒的大小与位置、试样受潮、表面粗糙度的增加、气压降低均会使得表面电场发生严重畸变，加速沿面闪络的发生。该研究可为高压直流套管的绝缘优化设计与故障预警提供参考。
Breakdown discharges and surface flashover caused by internal and external factors in high-voltage directcurrent(HVDC) bushings have posed a serious threat to the safe and stable operation of ultra-high-voltage DC transmission projects. To investigate the surface discharge characteristics of resin-impregnated paper(RIP) insulation in DC bushings under the combined influence of multiple internal and external factors, a surface discharge test system for RIP insulation specimens was established. The discharge behavior associated with internal insulation defects in HVDC bushings was analyzed, and the influence laws and underlying mechanisms of metallic particle contamination, surface roughness, air pressure, specimen dimensions, and humidity on surface discharge of RIP insulation were systematically examined. Experimental results indicate that the presence of metallic particles, increased surface roughness, elevated humidity, and larger specimen dimensions all significantly reduce the surface flashover electric field strength, whereas surface coating and secondary drying can moderately improve insulation performance. Electric field distortion at the gas-solid interface and surface charge accumulation are identified as key factors governing the surface discharge process. The size and location of metallic particles, moisture ingress into the specimen, increased surface roughness, and reduced air pressure can all cause severe distortion of the surface electric field, thereby accelerating the occurrence of surface flashover. This study provides a useful reference for insulation optimization design and fault early warning of HVDC bushings.

关键词(KeyWords)： 高压直流套管;胶浸纸绝缘;多因素;沿面放电;影响机制
HVDC bushing;resin-impregnated paper;multiple factors;surface discharge;influence mechanism

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（52407187）;; 中国南方电网有限责任公司科技项目（CG0100022001866533）

作者(Author): 邓军,潘志城,周海滨,朱光亚
DENG Jun,PAN Zhicheng,ZHOU Haibin,ZHU Guangya

DOI: 10.19585/j.zjdl.202606012

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