高电压技术2011，Vol.37Issue(8)：1924-1929,6.
油纸绝缘系统中含高水分绝缘纸板的沿面爬电特性
Creepage Discharge Performance of High Moisture Pressboard in Oil-paper Insulation System
摘要
Abstract
High moisture in pressboard may be a predominant factor causing creepage discharge failure in power transformer. To research the creepage discharge performance of high moisture pressboard, possible high moisture in pressboard of power transformer was analyzed according to Oommen paper-oil moisture equilibrium curves, and a creepage discharge simulation and test setup and measurement system were established, which were consisted of creepage discharge model, test tank, Zhongfen 2000 A gas-phase chromatographic instrument, and DST-4 partial discharge detector. Moreover, a creepage discharge model was constructed by 25 cm-long pressboard between plate electrode and ball electrode. When the moisture of pressboard reached 7% in creepage discharge process, the appar- ent discharge magnitude and dissolved gases in oil were measured. The results show that moisture of part pressboard may reach to 7% when oil） moisture is 30× 10^-6, and the inception electric field strength of ereepage diseharge is on- ly about 0.3 kV/cm which is much lower than available electric field strength of transformer; creepage discharge ap- pears at small oil gap in high voltage and ground electrode firstiy and its apparent discharge magnitude is about 20000 pC; creepage discharge is intermittent and even stops at some time; bright are and lots of bubbles can be ob- served; dissolved gases contents generated by creepage discharge are very high, especially H2, CO and Cz Hz.关键词
变压器/纸板/水分质量分数/爬电/溶解气体/白斑Key words
power transformer/pressboard/moisture/ereepage/dissolved gases/white mark分类
信息技术与安全科学引用本文复制引用
王伟,周冰,徐剑峰,汪鑫,陈明,李成榕..油纸绝缘系统中含高水分绝缘纸板的沿面爬电特性[J].高电压技术,2011,37(8):1924-1929,6.基金项目
国家重点基金研究发展计划（973计划）（2009CB724508）. （）
