摘要
光纤(extrinsic fabry-perot interferometric,EFPI)传感器是基于Fabry-Perot光学干涉原理来检测局放超声信号的一种传感器,具有灵敏度高、抗电磁干扰等优点,广泛应用于电气设备局部放电的检测。该文提出了一种采用内置式光纤EFPI传感器来检测GIS中局放超声信号的方法,利用有限元法对GIS内部SF6中超声信号的传播特性进行了仿真和试验研究。发现当超声信号经过第一个隔板式盆式绝缘子后,衰减度已经达到近90%,当GIS内采用支撑式盆式绝缘子时,局放超声信号的衰减情况则接近于其在单纯SF6气体内传播时的衰减情况。通过光纤EFPI传感器在GIS中距离检测特性的研究,发现不同距离的传感器所测到的局放信号幅值衰减由快到慢,与仿真中的信号衰减规律接近。通过对比光纤EFPI传感器和压电传感器的检测效果,证实光纤EFPI传感器的灵敏度明显高于压电传感器。
Based on the Fabry-Perot optical interference principle,the optical fiber EFPI sensor is used to detect PD ultrasonic signals.It has the advantages of high sensitivity and antielectromagnetic interference,and is widely used in the detection of PD in electrical equipment.This paper presents a method to detect local ultrasonic signals in the GIS by using a built-in fiber-optic EFPI sensor.The propagation characteristics of ultrasonic signals in SF6 in the GIS are simulated and experimentally studied by using the finite element method.It is found that when the ultrasonic signal passes through the first diaphragm basin insulator,the attenuation degree reaches about 90%.When the supported basin insulator is used in the GIS,the attenuation of the PD ultrasonic signal is close to that in the pure SF6 gas in propagation.Through the research on the distance detection characteristics of the optical fiber EFPI sensor,it is found that the amplitude attenuation of PD signal measured by different distance sensors are from fast to slow,which is close to the signal attenuation law in simulation.Comparing the detection effect of the EFPI and PZT sensors,we find that the sensitivity of the EFPI sensor is significantly higher than that of the PZT sensor.
作者
王赞
郑理威
陈忠贤
隋浩冉
高超飞
王伟
WANG Zan;ZHENG Liwei;CHEN Zhongxian;SUI Haoran;GAO Chaofei;WANG Wei(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;School of Automation,Beijing Information Science&Technology University,Beijing 100192,China)
出处
《电网与清洁能源》
北大核心
2022年第2期67-75,共9页
Power System and Clean Energy
基金
国家自然科学基金(51577063)。
