用低反射率光栅阵列实现智能复合电力电缆温度监测
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摘要
针对现有的电缆温度监测方法主要存在无法检测电缆内部温度和测温时易受到应力影响等缺点。针对此本文研究采用低反射率光栅(wFBG)阵列智能复合电力电缆温度监测技术,用于实时监测电缆内部及外部的温度分布情况。通过免应力光栅阵列,解决了复合电缆和光缆的过程中因光纤受力而影响光栅波长准确测量从而造成对温度的影响问题。系统通过检测wFBG波长漂移得到温度信息从而实现高灵敏度高空间分辨率的智能电缆的分布式温度在线监测。搭建了基于wFBG阵列的复合电力电缆实验系统,结果表明,该系统可以实现对电缆内部及外部温度的高精度、高空间分辨率分布式测量,电缆沿线空间分辨率达到10 cm,测温精度达到0.1℃。该低反射率光栅阵列智能复合电力电缆温度监测系统可以满足智能电网运行的实际需要。
This paper uses the temperature monitoring technology on intelligent composite electric cable to monitor the temperature of the electric cable in real time based on weak fiber Bragg grating(wFBG) array.Through two optical fibers in parallel connection,the monitoring of the internal and external temperatures of the electric cable can be realized and the influence of stress during temperature measurement can be avoided.The temperature signal is obtained by detecting wFBG wavelength drift to achieve high accuracy and high spatial resolution temperature measurement.The system is experimentally studied using the wFBG array.The results show that the system can achieve high accuracy,high sensitivity and high spatial resolution distributed measurement of the internal and external temperatures of the electric cable,and its spatial resolution is up to 10 cm,the measurement accuracy is 0.1 ℃.The temperature monitoring system of intelligent composite electric cable based on wFBG array can meet the actual needs of smart grid operation.
This paper uses the temperature monitoring technology on intelligent composite electric cable to monitor the temperature of the electric cable in real time based on weak fiber Bragg grating(wFBG) array.Through two optical fibers in parallel connection,the monitoring of the internal and external temperatures of the electric cable can be realized and the influence of stress during temperature measurement can be avoided.The temperature signal is obtained by detecting wFBG wavelength drift to achieve high accuracy and high spatial resolution temperature measurement.The system is experimentally studied using the wFBG array.The results show that the system can achieve high accuracy,high sensitivity and high spatial resolution distributed measurement of the internal and external temperatures of the electric cable,and its spatial resolution is up to 10 cm,the measurement accuracy is 0.1 ℃.The temperature monitoring system of intelligent composite electric cable based on wFBG array can meet the actual needs of smart grid operation.
引文
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[19] Ren L,Jia Z G,Li H N,et al.Design and experimental study on FBG hoop-strain sensor in pipeline monitoring[J].Optical Fiber Technology,2014,20(1):15-23.
[20] Kisa?a P,Ci?szczyk S.Method of simultaneous measurement of two direction force and temperature using FBG sensor head[J].Applied Optics,2015,54(10):2677-2687.
[2] GONG Tian-sen,TONG Fang-xuan.Design of temperature monitoring system based on Fiber Bragg grating sensor for high-voltage switch cabinet[J].Laser Journal,2014,(9):89-91.龚天森,仝芳轩.基于光纤光栅传感器高压开关柜温度监测系统设计[J].激光杂志,2014,(9):89-91.
[3] Xiang X,Tu P,Zhao J.Application of fiber Bragg grating sensor in temperature monitoring of power cable joints[C].International Conference on Electronics,Communications and Control.IEEE,2011,755-757.
[4] LI Jun,BIAN Chao,WU JUN.The optical fiber grating temperature on-line monitoring system of power cable[J].Jiangsu Electrical Engineering,2005,24(1):6-8.李军,卞超,吴珺.电力电缆光纤光栅测温在线监测系统[J].电力工程技术,2005,24(1):6-8.
[5] Qi Y B,Wu G F,Wang Y M.Optimum design of fiber Bragg grating real-time on-line temperature detecting sensor for power cable[J].Journal of Central South University,2011,42(11):3415-3420.
[6] XIE Ren-wei,ZHANG Xue-zhi,WANG Shuang,et al.Study on the influencing factors of fiber Bragg grating temperature sensor stability[J].Optoelectronics Lasers,2018,29(4):1005-0086.谢仁伟,张学智,王双,等.光纤光栅温度传感器稳定影响因素研究[J].光电子·激光,2018,29(4):1005-0086.
[7] Anqiang L,Yongqian L I,Jing L I,et al.Strain and temperature monitoring of 110 kV optical fiber composite submarine power cable based on Brillouin optical time domain reflectometer[J].High Voltage Engineering,2014,40(2):533-539.
[8] WANG Rui-wen.On-line temperature monitoring system of power cable based on ZigBee technology[J].Telecom Power Technology,2017,34(6):161-162.王瑞文.基于ZigBee技术的电力电缆温度在线监测系统[J].通信电源技术,2017,34(6):161-162.
[9] XU Chao, YAN Jia-yi, MAO Tian-qi, et al.Temperature monitoring and ampacity calculation for power cable based on incoherent OFDR distributed fiber sensors[J].Journal of Functional Materials & Devices,2017,(5):119-124.徐朝,严加义,毛天奇,等.基于非相干OFDR的分布式传感电力电缆温度在线监测和载流量计算[J].功能材料与器件学报,2017,(5):119-124.
[10] MA Xiao-chuan,ZHOU Zhen-an,LIU Ai-chun,et al.A high-sensitivity and stable fiber Bragg grating temperature sensor[J].Journal of Optoelectronics·Laser,2013,24(7):1245-1250.马晓川,周振安,刘爱春,等.高灵敏度稳定光纤光栅温度传感器的研究[J].光电子·激光,2013,24(7):1245-1250.
[11] Guo W,Li Y.Temperature and strain online monitoring system of power cable based on fiber Bragg grating[J].IEEE,2008,1-4.
[12] Dong,Archambault J L,et al.Single pulse Bragg gratings written during fibre drawing[J].Electronics Letters,1993,29(17):1577-1578.
[13] Askins C G,Putnam M A,Patrick H J,et al.Fibre strength unaffected by on-line writing of single-pulse Bragg gratings[J].Electronics Letters,1997,33(15):1333-1334.
[14] Lindner E,Schuster K,Rothhardt M.Trends and future of fiber Bragg grating sensing technologies:tailored draw tower gratings (DTGs)[C].Optical Sensing and Detection III.International Society for Optics and Photonics,2014,91410X.
[15] Lindner E,Mrbitz J,Chojetzki C,et al.Tailored draw tower fiber Bragg gratings for various sensing applications[J].Proc Spie,2012,8351(1):37.
[16] Grattan K T V,Sun T.Fiber optic sensor technology:an overview[J].Sensors & Actuators A Physical,2000,82(1):40-61.
[17] Zhang L,Qian J,Zhang Y,et al.On SDM/WDM FBG sensor net for shape detection of endoscope[C].IEEE International Conference Mechatronics and Automation.IEEE,2005,(4):1986-1991.
[18] Cooper D J,Coroy T,Smith P W.Time-division multiplexing of large serial fiber-optic Bragg grating sensor arrays[J].Applied Optics,2001,40(16):2643-2654.
[19] Ren L,Jia Z G,Li H N,et al.Design and experimental study on FBG hoop-strain sensor in pipeline monitoring[J].Optical Fiber Technology,2014,20(1):15-23.
[20] Kisa?a P,Ci?szczyk S.Method of simultaneous measurement of two direction force and temperature using FBG sensor head[J].Applied Optics,2015,54(10):2677-2687.