应用于高压电缆的光纤分布式温度传感新技术

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Application of Distributed Temperature Sensing Technolo gy in High Voltage Cable

陈 军  李永丽

（天津大学电气与自动化工程学院，天津 300072）

CHEN Jun，LI Yongli

（<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />School of Electrical Engineering and Automation，Tianjin University，Tianjin 300072，China）

Abstract

　　The technology of distributed temperature sensing is a novel technique surveying the real time distribution of spatial temperature pattern.This technology is b ased on the propagation characteristic of laser spreading in optical fiber. The distributed temperature of the field along the fiber can be continuously measure d by this technology.This paper introduces the thermometric fundamentals of the sensing technology and its application in detecting the interior temperature of high?voltage cable. In addition，the research indicates that the assemblage mod e of fiber can influence the thermometric accuracy.

　　Key words：high voltage cable；optical fiber；DTS；OTDR

　　一、前言

　　分布式温度传感（DTS：distributed temperature sensing）技术是一种用于实时测量空间温度场分布的传感技术。该技术利用光时域反射（OTDR：optical time domain re flectometry）原理、激光喇曼光谱原理，经波分复用器、光电检测器等对采集的温度信息进行放大并将温度信息实时地计算出来。目前，国外（主要是英国、日本等国）已利用激光喇曼光谱效应研制出分布式光纤温度传感器产品，而国内也在积极 地开展这方面的研究工作，现已研制成功基于分布式光纤温度传感原理的一系列产品，可广泛应用在航空航天、石油测井、电力、冶金、煤矿等领域中。国内把分布式光纤温度传感技术引入电力系统电缆测温的研究工作只是刚刚开始。