【作者】 卢宇；

【导师】 陈荣； 吴允平；

【作者基本信息】 福建师范大学 ， 光学工程， 2009， 硕士

【摘要】 SF6气体具有优异的绝缘和灭弧特性,已广泛应用于电力系统的高压断路器、变压器等设备中。然而,当发生SF6气体泄漏时,会大大降低气体的绝缘和灭弧能力,给电力设备的安全运行带来严重隐患,也会给操作人员带来危险。为此,我国《电业安全工作规程》特别规定,在相关场所必须安装SF6气体和氧气检测报警装置。早期对于六氟化硫的泄漏主要采用皂水查漏、手持检漏仪等检测方法,属于非在线检测,存在主观性大、不够精确等问题；上世纪九十年代末期到本新世纪初,逐渐发展出紫外线电离型、高频振荡无极电离型、电子捕获型和铂丝热电子发射型及负电晕放电型等在线检漏仪器,但在实际使用中仍存在泄漏部位定位性能差、检测误差随环境变化大和定量检测困难等不足；美国EPRI开发的GasVueTG230激光摄像仪,可以在相对较远距离就能发现泄漏的具体部位,但该激光发生器体积较大且重、其成像范围必须大于3m才能达到较高的图像分辨率、对于一些没有背景的设备,某些泄漏点是无法检测出来的。本论文根据目前SF6检测技术研究的不足,分析了SF6气体对C02激光强吸收的特性,设计了基于C02激光技术的SF6气体检漏系统。给出了系统的设计方案,详细阐述了远程监控中心、现场数据控制中心、光机电控制系统、SF6光学分析系统、温度湿度检测终端、H2S气体、S02气体等衍生物质浓度检测终端的设计。系统实现了对SF6气体等环境参量进行实时在线检测、综合分析、预警的功能,克服传统的SF6的测量方法所引起设备老化快、误报警率高的问题是新一代电力安全监控系统。论文的最后,总结了本课题所研究的内容,提出了本课题进一步研究的方向。更多还原

【Abstract】 SF6 has been widely used in power system such as high-voltage circuit breakers, transformers etc. for its excellent insulative and arc extinguishable characteristics. But these characteristics will change when SF6 leaks; it would bring problems to equipment safety and take dangerous to operator. "Working Regulation of Electrical Safety" prescribes that SF6 and O2 detecting device must be installed in high voltage substations.In the early days, SOAP water and handheld leak detector used to detect SF6 leaks were not online testing methods. The conclusion is made by user and the result is also not accurate. From the late 1990s to the beginning of this century, new online detecting methods such as UV ionization, high-frequency oscillatory non-electrode ionization, e-capturing, platinum hot electron emission and corona discharge have been gradually developed. But some poor performance is still found such as difficulty in finding leak position; trouble in insufficient quantitative testing and detecting errors caused by environmental changes. Laser Imager GasVueTG230 which is developed by ERPI Co. of American can locate the specific parts of the leak position in a relatively long distance, but the device is still not suitable for SF6 leak detecting. The first reason is its clumpsy; the second is that the imaging range must be larger than 3 meters in order to get a better image resolution; the third is that the leak point without background cannot be checked out by this device.This paper first points out the shortage of current studies on SF6 detection technology, and at the same time analyzes the characteristics that the CO2 laser can be largely absorbed by SF6 gas. The conclusion of using a new SF6 leak detecting system applying CO2 laser is drawn. The system design scheme is proposed. The design of remote monitoring center, data control center, optical and electrical control system, SF6 optical analysis system, temperature and humidity testing terminal, derivatives such as H2S and SO2 concentration measurement terminal are described in detail. The system avoids the shortage of device aging fast and high false alarm rate which stay on the old system. It can on-line detect environmental parameters in real time, the detect result can also be comprehensively analyzed to make early warning. It is a new generation of electricity safety monitoring system.Finally, this paper summarizes the research contents and puts forward a further study direction on the topic.更多还原