SF_(6)组分高精度分离、多通道持续测量技术优化与应用

Optimization and Application of High Precision Separation and Multi-channel Continuous Measurement Technology for SF_(6) Components

六氟化硫气体绝缘电力设备(SF_(6)设备)因其优秀的绝缘、灭弧性能以及占地少,可靠性高,安全,维护工作量小等诸多优点,得到广泛应用。SF_(6)设备在安装、运行过程中的诸多因素都可能导致设备出现绝缘缺陷,测量设备内SF_(6)气体中典型分解产物的含量是判断绝缘缺陷的最有效检测手段之一。为检测SF_(6)气体的分解产物,通常使用离线仪器对变电站的SF_(6)设备进行定期巡检,如SF_(6)分解产物测试仪、SF_(6)纯度测试仪,分解产物测试仪主要基于电化学检测原理测试气体体积分数,纯度测试仪主要基于热导法测试SF_(6)纯度值。这些方法的检测组分少、实时性差,通常在设备故障后才能检测到气体组分异常,无法提前预防设备潜伏性故障。而在线监测技术目前仅仅在气体密度、温度和湿度等方面得到了较为成熟的应用,至今没有一套成熟、稳定、可靠的分解产物在线监测技术能满足现场运行要求。文中提出一种SF_(6)气体分解产物的高精度分离、多通道持续测量的技术,解决了长时间监测过程中气体流量不稳定、单通道检测效率低、无法远程进行色谱取样分析等技术难题。与传统离线检测手段相比,该方法具备检测组分多、能够远程实时监控、长时间监控稳定性好、监测效率更高等优点,填补了气相色谱法在SF_(6)气体在线监测方面应用的不足。采用此方法,通过持续不间断监测SF_(6)设备中10余种特征气体组分的体积分数,可以准确、实时、高效地评估SF_(6)设备当前的绝缘缺陷状态。

Sulfur hexafluoride gas insulated power equipment(hereinafter referred to as SF_(6) equipment)has been widely used because of its excellent insulation,arc extinguishing performance,small footprint,high reliability,safety,small maintenance workload and many other advantages.Many factors may lead to insulation defects in SF_(6) equipment during installation and operation.Measuring the content of typical decomposition products in SF_(6) gas in the equipment is one of the most effective detection methods to judge insulation defects.In order to detect the decomposition products of SF_(6) gas,off-line instruments are usually used to conduct regular inspection of SF_(6) equipment in substations.This method has few detection components and poor real-time performance.Usually,the abnormal gas components can be detected after the equipment failure,so it can not prevent the latent failure of the equipment in advance.In this paper,a technology of high-precision separation and multi-channel continuous measurement of SF_(6)gas decomposition products is proposed,which solves the technical problems such as unstable gas flow,low efficiency of single channel detection and inability to remotely carry out chromatographic sampling and analysis in theprocess of long-time monitoring.Compared with the traditional off-line detection methods,this method has more de-tection components,remote real-time monitoring,good long-time monitoring stability and higher monitoring efficien-cy,which fills the deficiency of gas chromatography monitoring method in the field of SF_(6) gas on-line monitoring.By continuously monitoring the content of more than 10 characteristic gas components in SF_(6) equipment,the currentinsulation defect state of SF_(6) equipment can be evaluated accurately,real-time and efficiently.