标准摘要
[中文适用范围]: 本国际标准化文件涉及从电力变压器的气体收集继电器中采集游离气体的技术。描述了三种采集游离气体的方法。从油浸式设备(如电力和仪用变压器、电抗器、套管、充油电缆和油浸式罐型电容器)中采集油样技术不再包含在此标准中,而是在 IEC 60475:2011 的 4.2 节中描述。在分析溶解在油中的气体之前,首先将其从油中提取出来。描述了三种基本方法:一种使用真空提取(Toepler 法和部分脱气法),另一种通过载气鼓泡通过油样样品来置换溶解气体(吹扫法),最后一种是通过油样与少量载气之间的气体分配(顶空法)。提取后的气体通过气相色谱法进行定量分析;描述了一种分析方法。来自气体收集继电器的游离气体在无需预处理的情况下进行分析。确保气体提取和分析设备(作为一个单一系统)性能的首选方法是,对实验室制备的含有已知浓度气体的油样(“油中气体标准”)进行脱气,并定量分析提取出的气体。描述了两种制备油中气体标准的方法。对于色谱仪的日常校准检查,使用含有各气体组分合适已知量的标准气体混合物是方便的,其比例应与从变压器油中提取的常见气体比例相似。所描述的技术既考虑了工厂验收测试中特有的问题(此时油中的气体含量通常很低),也考虑了现场监测设备施加的问题(此时样本运输可能通过非加压空运,且电厂与检测实验室之间可能存在巨大的环境温度差异)。 [外文原描述]: IEC 60567:2011 deals with the techniques for sampling free gases from gas-collecting relays from power transformers. Three methods of sampling free gases are described. The techniques described take account, on the one hand, of the problems peculiar to analyses associated with acceptance testing in the factory, where gas contents of oil are generally very low and, on the other hand, of the problems imposed by monitoring equipment in the field, where transport of samples may be by un-pressurized air freight and where considerable differences in ambient temperature may exist between the plant and the examining laboratory. Since the publication of the previous edition, CIGRE TF.D1.01.15 has made progress in several areas of dissolved gas analysis (DGA). These advances are included in this fourth edition.
英文名称Oil-filled electrical equipment - Sampling of gases and analysis of free and dissolved gases - Guidance