介绍了新型变压器油色谱在线监测系统的关键技术。带微孔的聚四氟乙烯膜使渗透速度大大提高，仅用两天时间可完成油气分离；带延迟毛细管的复合色谱柱达到了理想的分离度；新型热线型气敏传感器灵敏且对数线性度好；整套装置的分布式控制技术工作可靠、体积小、易维护。-Introduced a new type of transformer oil chromatography-line monitoring system of key technologies. With microporous PTFE membrane so that the seepage rate greatly increased, just two days to complete the separation of oil and gas　with delayed capillary column of the composite reached a satisfactory degree of separation　new hotline-based gas sensor sensitive to the number and linearity　package devices reliable distributed control technology, small size, easy to maintain.