近红外激光光声变压器油溶解气分析技术研究

项目名称： 近红外激光光声变压器油溶解气分析技术研究

项目编号： No.51277021

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 电工技术

项目作者： 于清旭

作者单位： 大连理工大学

项目金额： 80万元

中文摘要： 为保障电网安全、可靠和经济地运行，需要对大型浸油变压器的健康状况进行连续的在线监测。变压器油中溶解气分析（DGA）是诊断变压器潜伏性故障最为有效的方法。本项目提出了一种新的激光光声DGA监测技术方案。通过集成近红外宽带可调谐光纤激光器、高性能光纤声波传感器和共振式光声池，结合波长扫描和频率调制技术构成的光声DGA监测系统，可以实现对多种变压器故障特征气体的同时测量，其中对乙炔的测量灵敏度预期可达到亚 ppb量级。此外该系统还具有气体传感单元的全光学感测、易于远距离遥测和无机械运动部件的特点， 因而从本质上解决了目前DGA 光声监测技术的易受电磁干扰和机械振动影响的问题。利用该系统的高灵敏度特点，提出了通过对变压器油中放电产物的测量，研究变压器早期故障演化规律和建立新的早期故障诊断判据的研究方案。本项目研究结果将为大型电力变压器故障的早期诊断和电网运行安全监测提供一种新的技术手段。

中文关键词： 近红外光声光谱分析；变压器在线监测；变压器油溶解气分析；多种气体测量；高灵敏度

英文摘要： Knowledge of the condition of transformers is essential for all electrical grids and on-line monitoring of critical transformers is increasingly vital. The information helps operators to manage their assets and make decisions on continuing operation, maintenance or replacement. Dissolved Gas-in-oil Analysis (DGA) is the most important test for condition assessment of transformers as it is a well established method of transformer diagnosis. Many transformer failures can be prevented through the correlation of DGA data to real events. A novel near infrared laser based photoacoustic (PA) DGA monitoring solution is proposed in this project. Instead of thermal radiation source and electric microphone used in traditional PA DGA monitors, a broadband tunable erbium doped fiber laser in tandem with a high output power fiber amplifier and an optical fiber microphone are applied in the new PA DGA monitoring system. Furthermore a wavelength scan and frequency modulation mechanism is used instead of an optical intensity modulation method. The new integration of these advanced techniques results in a significant improvement of the performances of the PA DAG monitor system. A sub-ppb level detectable concentration limit for C2H2 and sub-ppm to ppm level detectable limits for C2H4, CO, CO2 and H2O gases are expected. As the g

英文关键词： near infrared photoacoustic spectroscopy；transformer on-line mornitoring；dissolved gas-in-oil analysis；multi-gas meassurement；high sensitivity