摘要
对变压器绝缘进行有效的局部放电在线监测,可及时发现变压器的绝缘缺陷,确保整个电力系统的安全运行。本文采用光纤超声传感器对油中局部放电超声信号在油、绝缘纸板、钢板、绝缘纸-钢板组合介质以及铜线圈中传播时,超声波衰减情况、传播速度和波形变化进行了试验研究,结果表明:超声波在油、绝缘纸、钢板以及组合介质中传播时信号强度会衰减,但波形不会变化;铜线圈对超声波影响最大,不仅衰减严重,速度减小,而且波形也会发生畸变。最后在实体变压器中进行了实际测量,取得较好的检测效果。
It is of great value to detect Partial Discharge （PD）in transformer insulation sensitively on-line,to discov-er insulation defect in time,and to ensure the safety of the whole power system.In this paper,the ultrasonic attenua-tion,propagation velocity and waveform changes of PD is tested in oil-paper insulation through oil,insulation paper, steel,paper-steel composite medium and copper wire by using fiber-optic ultrasonic sensor.The results show that sig-nal intensity of ultrasonic wave in oil,insulation paper,steel and composite medium can be attenuated,while the wave shape doesn’t change.It also can be seen from results that the influence of copper wire is the most serious,which can not only decrease the intensity and speed of ultrasonic wave, but also distort the ultrasonic wave.In the end,the actual measurement is carried out in the solid transformer,which obtains better detection effect.
作者
张春燕
张映月
滕俊
盛吉
商超
王伟
ZHANG Chunyan ZHANG Yingyue TENG Jun SHENG Ji SHANG Chao WANG Wei(Yangzhou Power Supply Company, Yangzhou 225000, China North China Electric Power University, Beijing 102206, China)
出处
《现代电力》
北大核心
2016年第6期56-63,共8页
Modern Electric Power
基金
国家自然科学基金项目(51577063)
关键词
变压器
超声波
油纸绝缘
光纤超声传感器
transformer
ultrasonic wave
oil-paper insula-tion
fiber-optic ultrasonic sensor
