操作冲击电压及其叠加工频电应力下油纸绝缘尖端放电及燃弧特性研究  

Point discharge and arc characteristics of oil-pressboard insulation under switching impulse voltage and superimposing power frequency electrical stress

作　　者：吴经锋 王文森 丁彬 张璐 韩彦华 李祎 李斯盟 WU Jingfeng;WANG Wensen;DING Bin;ZHANG Lu;HAN Yanhua;LI Yi;LI Simeng(Electric Power Research Insititute of Shaanxi Electric Power Company SGCC,Xi'an 710100,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China;School of Physics&Information Technology,Shaanxi Normal University,Xi'an 710119,China)

机构地区：[1]国网陕西省电力有限公司电力科学研究院,陕西西安710100 [2]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [3]陕西师范大学物理学与信息技术学院,陕西西安710119

出　　处：《绝缘材料》2023年第1期34-44,共11页Insulating Materials

基　　金：国家自然科学基金资助项目(52007148);国网陕西省电力公司科技项目(5226KY20001A)。

摘　　要：具有油纸绝缘绕组结构的关键电力设备在投运时容易出现乙炔超标问题,进而产生局部放电和燃弧现象。为此,本文研究操作冲击电压及其叠加工频电应力下油纸绝缘的尖端放电及燃弧特性,对比分析不同尖端缺陷的放电与燃弧特性,讨论冲击电压与工频电压叠加相位的影响。结果表明:含有纸板的缺陷模型击穿后的燃弧过程可分为高频重燃弧阶段、稳定燃弧阶段、电压恢复前的重燃阶段,其中高频重燃弧阶段具有较高的燃弧频次与较低的恢复电压;操作冲击电压下,纯油隙缺陷模型出现多次击穿,油纸复合绝缘缺陷模型出现纸板直接击穿和油纸先后击穿,且缺陷模型的类型会影响放电特性及燃弧规律;叠加相位则是通过影响电应力幅值来影响放电特性与燃弧规律。The key power equipment with the oil-pressboard insulation winding structure is prone to appear the problem of acetylene content exceeding the standard when putting into operation, and then partial discharge and arcing phenomena are produced. Therefore, the point discharge and arcing characteristics of oil-pressboard insulation were studied under switching impulse voltage and superimposing power frequency electrical stress. The discharge and arcing characteristics of different point defects were compared and analyzed, and the influence of the superimposed phase of impulse voltage and power frequency voltage was discussed. The results show that the arcing process of the defect model containing pressboard after breakdown can divide into high-frequency re-arcing stage, stable arcing stage, and re-arcing stage before the voltage restored. Among them, the high-frequency re-arcing stage has higher arcing frequency and lower recovery voltage. Under the switching impulse voltage, the pure oil gap defect model shows multiple breakdown, and the oil-pressboard composite insulation defect model shows that the pressboard breakdown directly and the oil pressboard breakdown successively, and the defect model type affects the discharge characteristics and arcing rule. The superposition phase affects the discharge characteristics and arcing law by affecting the electrical stress magnitude.

关 键 词：重燃弧 局部放电 操作冲击电压 电抗器 变压器 

分 类 号：TM855[电气工程—高电压与绝缘技术]