长期以来，油浸变压器油中的气体成分和含量的气相色谱分析法一直是判断变压器状态的重要手段。其原理是利用所采集的气体浓度的相对比值，推测出油或油纸绝缘所处的裂解条件。
(3)红外测温
红外热像是利用红外探测器接受被测目标的红外信号，经放大处理，转换成标准信号，然后通过电视屏或器显示红外热像图。当变压器引线接触不良、线圈导体接头虚焊、过负荷运行时都会引起导电回路局部过热，铁心多点接地也会引起铁心过热。
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