基于BOTDA的分布式光纤在线温度监控技术研究

Distributed Optical Fiber In-service Thermometric Research Based on BOTDA

主要介绍基于BOTDA(Brilouin Optical Time-Domain Analysis)的分布式光纤测温系统应用于高压输电海缆温度在线监控的可行性,简要介绍了该技术的基本原理和特点。应用分布式光纤测温系统对110kV光电复合海缆进行测试,考察了仪器的测温精度、响应时间及运行可靠性等性能,试验结果说明该技术温度误差小、响应时间短、运行可靠且能实现长距离大范围测温,可有效应用于电缆温度在线监控,为实现导体温度的预警和实时计算在安全温度条件下(交联聚乙烯一般90℃)的载流量提供依据。

This paper introduces the technology of distributed optical fiber temperature measurement system based on BOTDA, which is applied in high voltage submarine transmission cable live temperature monitoring, of which features and function principles are given. Applying distributed optical fiber temperature measurement system in 110kV photoelectric compound submarine cable test, to inspect the instrument of temperature measurement in accuracy, reliability, response time and operational performance, test results show that the temperature error of the technology is small, response time is short, running is reliable, achieving a wide range and long distance of temperature measurement, the technology can be effectively applied in the cable temperature in-service monitoring, this technology provides basis to achieve early warning of conductor temperature abnormity and real-time calculating of carrying capacity in safe temperature.