空间电荷对油纸绝缘体击穿强度和沿面闪络的影响(英文)  

Effects of Space Charge on Breakdown Strength and Creeping Flashover in Oil-Paper Insulation

作　　者：周远翔[1] 孙清华[1] 李光范[2] 王云杉[1] 姜鑫鑫[1] 仇宇舟[1] 李金忠[2] 王宁华[2] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2009年第15期76-79,共4页Power System Technology

基　　金：Supported by National Natural Science Foundation of China (NSFC)(50438070);Program for New Century Excellent Talents in University of China (NCET-04-0095);Ph.D. Programs Foundation of Ministry of Education of China (200800030040)~~

摘　　要：换流变压器是直流输电工程的核心设备之一,其结构和工作状况比传统交流变压器更为复杂。针对换流变压器的特点,设计了相应的试验装置,初步对油纸绝缘中的体击穿和沿面闪络进行了试验研究。试验结果表明,极性反转现象同样存在于油纸绝缘系统中。即在直流电压下油纸绝缘中积聚的空间电荷畸变了周围的电场,导致油纸绝缘的直流击穿强度发生改变。同时,对油纸绝缘进行的沿面闪络试验表明,空间电荷的存在同样会影响油纸绝缘的沿面闪络。通过对上述试验结果进行讨论,发现传统交流变压器的设计理论和经验已不能满足换流变压器的要求,在换流变压器设计和制造中应给予空间电荷问题足够的关注。As one of the most important apparatuses used in HVDC transmission, converter transformer has complex structures and operates in an inclement circumstance. Therefore, more knowledge about the behavior of its insulating systems is required. In this paper, experiments were designed according to the operating state of converter transformers, and processes of breakdown and creeping flashover in oil-paper insulation were studied. The results show that, polarity reversal effect exists in oil-paper insulation systems. In other words, space charge accumulated under DC electrical field has impacts on DC breakdown process of oil-paper insulation systems. Moreover, these experiments show that space charge could also affect the creeping flashover significantly. At the end, it is concluded that theory and experience in designing traditional AC transformers cannot meet the needs of converter transformer any longer, and more attention should be paid on space charge effect during design and manufacture of converter transformers.

关 键 词：体击穿 换流变压器 沿面闪络 油纸绝缘 空间电荷 

分 类 号：TM7[电气工程—电力系统及自动化]