【作者】 冯波；

【导师】 张晓星； 周倩；

【作者基本信息】 重庆大学 ， 电气工程， 2012， 硕士

【摘要】 变压器油中溶解气体是表征电力变压器早期潜伏性故障的重要特征量，实时分析油中溶解气体的组分和比例，判断变压器潜伏性故障的类型、程度及发展趋势，对确保变压器稳定、可靠、安全运行具有重要意义。针对目前变压器油中溶解气体检测方法存在的不足，即气相色谱法不适合连续的现场监测以及一些在线监测装置对油中溶解气体的检测存在交叉干扰的情况，提出用红外激光气体传感器用于变压器油中溶解气体的检测，并对C2H2的检测进行实验论证。红外激光气体传感器因在灵敏度、吸收选择性以及动态检测方面显示出其独特的优势，因而在变压器油中溶解气体在线监测方面具有广阔的应用前景。首先，论文阐述了目前国内外变压器油中溶解气体检测技术以及红外激光气体传感器的研究现状，在此基础上选取变压器油中乙炔为研究对象。基于气体比尔-朗伯定律以及气体分子红外吸收光谱理论，设计并成功搭建红外激光气体传感系统检测实验平台，在红外激光气体传感系统核心部件吸收气室的设计之中提出一种串联反射镜组透射式气室的设计方案，并完成红外激光气体传感系统中光源、温度控制器、半导体激光器驱动器、光电探测器等配套器件的选型。其次，对DFB LD光源的光谱特性(包括输出波长与控制电流、输出波长与注入电流、DFB LD工作波长的确定)以及光路传输损耗进行研究。选择乙炔的特征吸收谱线为研究对象，利用Javahawks软件仿真分析了温度、压强等因素对其吸收截面、峰值吸收系数以及谱线半高宽的影响。最后，利用搭建的红外激光气体传感系统检测实验平台对C2H2气体进行检测，实验研究表明：在不发生气体饱和吸收即在能够检测C2H2气体的浓度范围内，当检测波长恒定时，吸光度与检测气体浓度之间近似遵循线型关系，并且得到在不同波长检测时吸光度与气体浓度之间的关系符合HITRAN系列数据库所提供的参考结果，对检测结果进行了讨论和分析，最后提出基于最小二乘法对C2H2气体进行定量分析的方法，验证了用红外激光气体传感器检测变压器油中C2H2的可行性。更多还原

【Abstract】 Gas dissolved in transformer oil is one of the important characteristic quantitieswhich reflect the early discharge faults of transformers. Timely detection of gasesdissolved in insulating oils is an effective method to predict the potential inner faultsand the development of electrical equipment for early diagnosis, and so it is importantfor safe operation of transformers. In view of current gases dissolved in transformer oilare the shortcomings of the test method, namely gas chromatography is not suitable forcontinuous monitoring and some on-line monitoring device for the dissolved gasdetection presence of the cross of interference, proposes the use of spectrum absorptiontype optical fiber sensor used in gas of transformer fault detection, and on the testing ofthe experiment of C2H2argument. Laser infrared detection technology for the sensitivity,absorb selective and dynamic test showed its unique advantage, so the gases dissolvedin transformer oil online monitoring has wide application prospects.First, both at home and abroad, this paper expounds the gases dissolved intransformer oil detection technology and spectrum absorption type optical fiber sensorresearch situation of gas, and based on choose in transformer oil acetylene as theresearch object. Based on the gas beer-Lambert law and gas molecules absorb infraredspectrum theory, design and build optical fiber sensing system successfully gas testingexperiment platform, the optical fiber sensing system core components of the design ofthe gas chamber absorbs put forward a lens in the series of the group of transmission ofthe gas chamber design scheme, and complete the optical fiber sensing system in light,temperature controller, laser drives, photoelectric detector and other supporting deviceof selection.Second, DFB LD the spectral characteristics light sources (including outputwavelength and control current, output wavelength and into the current, DFB LD workto determine the wavelength) and the light path transmission loss for research. Choosethe absorption spectrum characteristics of acetylene line as the research object, usingJavahawks software simulation analysis factors such as temperature, pressure on theabsorption section, and the peak value absorption coefficient and spectral lines and ahalf high width influence.Finally, using the optical fiber sensing system set up gas detection experiments todetect C2H2gas platform, the results show that not happen in gas absorption is saturated in can detect C2H2gas concentration range, when detected wavelength constant,absorbency and the concentration of the gas detection approximate linear relationshipbetween follow, and get in different wavelength detection spectrophotometry and whenthe concentration of the gas with the relationship between the HITRAN series providedin the database which reference results, the detection results discussed and analyzed,and finally put forward based on least square method of C2H2gas the quantitativeanalysis method, and the performance parameters of sensor detailed analysis.更多还原