电缆分布式光纤测温装置校验及温度补偿方法研究 *

doi:10.11985/2020.04.015

摘要/Abstract

摘要：

针对高压电缆分布式光纤测温装置无法系统化开展仪器校验与性能评估的问题,提出了一种电缆分布式光纤测温装置校验方法。基于该方法,研究开发了一套基于自动化温度控制与采集的智能校验平台,利用可编程的循环恒温水浴搭建了分布式光纤测温装置校验环境,同时对系统的温度测量准确度等主要技术指标进行校验。文中采用该校验平台对四台相同配置的电缆分布式光纤测温装置开展测温准确度校验,各台装置测温准确度均小于±1 ℃。通过改变环境温度获得了各台装置的温漂数据,采用三次拟合方法得到了各台装置在5~35 ℃范围内的温度补偿公式。应用温度补偿后,各台DTS装置平均误差下降36%,最大误差下降85%,四台装置测温结果的准确性和一致性明显提高,温漂最大误差对比环境稳定时下降约33%,测温数据稳定性更高。

关键词: 高压电缆, 分布式光纤测温, 在线监测, 温度补偿, 仪器校验, 性能评估

Abstract:

In view of the problem that the distributed optical fiber temperature measuring device of high voltage cable cannot systematically carry out instrument calibration and performance evaluation, a calibration method of distributed optical fiber temperature sensing device is proposed. Based on this method, an intelligent verification platform based on automatic temperature control and acquisition is developed by using a programmable constant temperature water bath for main technical indicator calibration, such as temperature measurement accuracy and so on. The calibration platform is used to test the temperature accuracy of four cable distributed optical fiber temperature sensing devices with the same configuration. The temperature measuring accuracy of each device is less than ±1 ℃. The temperature drift data of each device are obtained by changing the ambient temperature, and the temperature compensation formula of each device in the range of 5-35 ℃ is obtained by using cubic fit. After the application of temperature compensation, the average error of each DTS device decreases 36%, and the maximum error decreases 85%. The accuracy and consistency of the temperature measurement results of each device are significantly improved. The maximum temperature drift error decreases about 33% compared with in stable environment, and the stability of temperature measurement data is higher.

Key words: High voltage cable, distributed optical fiber temperature sensing, online monitoring, temperature compensation, instrument calibration, performance evaluation

中图分类号:

TM933

刘佳鑫, 郎业兴, 韦德福, 唐红. 电缆分布式光纤测温装置校验及温度补偿方法研究 ^*[J]. 电气工程学报, 2020, 15(4): 121-127.

LIU Jiaxin, LANG Yexing, WEI Defu, TANG Hong. Research on Calibration and Temperature Compensation of Distributed Optical Fiber Temperature Sensing Device for High Voltage Cable[J]. Journal of Electrical Engineering, 2020, 15(4): 121-127.

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序号	技术参数	技术指标要求值
1	温度测量准确度/℃	≤±1
2	空间分辨率/m	≤2
3	温度分辨率/℃	≤0.5
4	定位准确度/m	≤±1

DTS编号	水浴温度/℃	拟合参数
DTS编号	水浴温度/℃	a₀	a₁	a₂	a₃	拟合度
1#	20	17.775 42	0.149 12	-0.002 49	0.000 03	0.970 69
	40	37.339 74	0.252 21	-0.008 39	0.000 13	0.980 88
	60	57.329 71	0.257 50	-0.009 30	0.000 16	0.982 59
2#	20	17.854 01	0.164 35	-0.004 08	0.000 07	0.974 24
	40	37.555 49	0.208 76	-0.005 86	0.000 09	0.972 53
	60	57.964 11	0.153 04	-0.003 63	0.000 06	0.978 46
3#	20	18.130 44	0.152 09	-0.003 38	0.000 06	0.974 71
	40	37.607 30	0.239 30	-0.007 72	0.000 12	0.983 51
	60	58.018 59	0.160 44	-0.004 05	0.000 07	0.973 30
4#	20	17.452 06	0.215 23	-0.006 69	0.000 11	0.983 64
	40	37.886 40	0.140 44	-0.002 77	0.000 05	0.974 53
	60	57.359 58	0.228 74	-0.007 05	0.000 11	0.980 91