DGA中三比值缺码研究初探

Preliminary study of undefined three-ratio code in DGA

三比值法的011编码没有给出对应的故障类型。在收集整理油中溶解气体分析(DGA)数据的基础上,将011编码的数据与编码空间中相邻的4个编码数据进行对比分析。分析发现,故障气体含量的对数值之间存在线性关系,进而利用线性回归和假设检验的方法对线性关系进行了研究。研究表明,甲烷、乙烷、乙烯的气体含量之间存在较明显的线性关系,而氢气与烃类气体含量的线性关系略微偏弱。利用线性分析的结果,并结合故障气体含量,对011编码所反映的故障类型从定性的角度进行了初步探讨。

The fault type of three-ratio code 011 is not defined,aiming at which,the DGA（Dissolved Gas Analysis） data are collected and sorted out,and the data related to code 011 and its four adjacent codes in code space are analyzed and compared. Results show the relationship between the logarithms of fault gas contents is linear. Further research on the relationship by the linear regression and hypothesis test shows that,the linear relationship among methane,ethane and ethylene is obvious while that between hydrogen and hydrocarbon is less obvious. The fault type of code 011 is preliminarily and qualitatively discussed based on the content of fault gases and the results of linearity analysis.