校验用变压器油标准气体计量模型及标准油配制研究

为检验变压器油中溶解气体在线监测装置测量数据的准确性,用标准油样对其进行校验已成为目前的主流方法。目前标准油配制方法主要为混合标准气法和单一标准气法,针对两方法相关数学模型,提出了其使用过程中的注意事项;比较两配油方法及其数学模型,单一标准气法优势较强。基于单一标准气法数学模型,改进了全自动标准油配制装置(全自动配油仪),并检验了改进后装置对变压器油溶解气体的配制结果。研究结果表明:改进后的全自动配油仪配油准确性高,配油误差在±10%以内,活塞式不锈钢油缸储油效果较好,标准油样浓度稳定性完全满足检验工作需求。

Study on Standard Gases Measurement Model and Standard Oil Preparation for Calibration of Transformer Oil

In order to test the accuracy of the on-line monitoring devices for dissolved gases in transformer oil, calibration with the standard oil has become the mainstream method. At present, there are mainly two standard oil preparation method, i.e., mixed standard gases method and single standard gas method. In this paper, precautions for application are proposed regarding the mathematical models related to the two methods,. From the comparison between the two preparation methods and the corresponding mathematical models, it is concluded that the single standard gas is more advantageous. Based on the mathematical model of single standard gas method, the automatic standard oil preparation device(automatic oil distribution instrument) is improved and tested through the preparation of the dissolved gases of transformer oil. The study results show that the improved automatic oil distribution instrument is of high accuracy with the oil preparation error of less than ±10%. The piston type stainless steel cylinder is proved to have better performance in oil storage. The concentration stability of the standard oil stored in this type of cylinder can completely meet the inspection requirements.