The working group in the Electric Technology Research Association (ETRA) in Japan has reviewed the actual status of conventional diagnosis by DGA in Japan and overseas. Various findings from the review are presented in this paper. (1) The required limits of detection and precision for gas-in-oil analysis are provided. (2) By classifying characteristic gases (C/sub 2/H/sub 2/, C/sub 2/H/sub 4/) which are present at the time of internal faults in a transformer and non-characteristic gases, three levels i.e., "Warning I", "Warning II" and "Trouble" are set as judgment criteria. (3) Graphical representations of diagnostic chart determined for discharge by overheating, partial discharge and arc discharge by using the ratio of gases. (4) Other conventional, diagnostic methods by specific gases are also reviewed.
展开▼
机译：日本电气技术研究协会（ETRA）的工作组审查了DGA在日本和海外进行的常规诊断的实际状况。本文介绍了本次审查的各种发现。 （1）提供了油中气体分析的检测极限和精密度。 （2）通过对在变压器内部故障时存在的特征气体（C / sub 2 / H / sub 2 /，C / sub 2 / H / sub 4 /）和非特征气体进行分类，分为三个等级即，将“警告I”，“警告II”和“故障”设置为判断标准。 （3）诊断图表的图形表示，该图表通过使用气体比例确定是通过过热，局部放电和电弧放电进行放电。 （4）还回顾了其他针对特定气体的常规诊断方法。
展开▼
