过热缺陷下少油设备的压力变化特性研究  

Study on Pressure Uariation Characteristics of Oil⁃minimum Equipment Under Overheat Defects

作　　者：贺兴容[1] 尹佳[2] 张国治 张燃[1] 陈凌[1] 张晓星[2] HE Xingrong;YIN Jia;ZHANG Guozhi;ZHANG Ran;CHEN Ling;ZHANG Xiaoxing(State Grid Sichuan Electric Power Company,Chengdu 610041,China;School of Electrical and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]国网四川省电力公司,成都610041 [2]武汉大学电气与自动化学院,武汉430072

出　　处：《高压电器》2021年第8期99-104,共6页High Voltage Apparatus

基　　金：国家电网公司科技项目(52199918000A)。

摘　　要：针对现有少油电力设备绝缘在线监测技术的不足,近年来,有学者提出了基于压力的少油设备在线监测技术。然而,目前并未有学者实验研究过热缺陷下少油设备内部压力变化特性。文中以110 kV油浸正立式电流互感器为试品,实验研究了过热温度分别为100、150、200、250、300℃时少油设备内部压力变化特性。结果表明:①轻度和低温过热缺陷引起的压力变化较小,50个小时内最大增量分别为1.33、1.65、2.01、2.51、2.70 kPa;②过热缺陷引起的压力变化呈指数形式增长,初始10 h,压力急剧上升,10~20 h压力缓慢上升,20 h之后压力基本保持不变;③过热点温度每上升50℃,50个小时内,压力最大值增大范围为几百Pa。同时理论分析指出了过热缺陷与放电缺陷引起的压力变化特性不同的3个原因。In view of insufficient dielectric online detection technology of existing minimum oil electrical equipment,in recent years,some scholars have proposed pressure⁃based online monitoring technology of minimum oil equipment.However,internal pressure variation characteristic of minimum oil equipment at overheat defect has not been experimentally studied by scholars.In this paper,110 kV oil immersed vertical currnt transformer is taken as prototype to study by experiment the internal pressure variation characteristic of minimum oil equipment at the tempera⁃ture of 100℃,150℃,200℃,250℃and 300℃respectively.It is shown by the result that①the pressure varia⁃tion by mild and low temperature overheat defects is small and the maximum increments in 50 hours is 1.33 kPa,1.65 kPa,2.01 kPa,2.51 kPa,and 2.70 kPa,respectively;②the pressure variation due to overheat defect shows expo⁃nential increase.In the initial 10 hours,the pressure rises sharply and gradually in 10~20 hours.The pressure re⁃mains basically unchanged after 20 hours.③The increase range the maximum pressure with 50 hours is several hun⁃dreds of Pascals at every 50℃rise in the temperature of the overheat spot.At the same time,three reasons with differ⁃ent pressure variation characteristic due to overheating and discharge defects are pointed out by theoretical analysis.

关 键 词：少油设备 过热缺陷 压力变化 

分 类 号：TM855[电气工程—高电压与绝缘技术]