The paper analyses the on - line monitoring power transformer " s chromatogram of oil in the pingliang 110kv substation and investigation the status in quo of transformer insulation monitor based on chromatogram of transformer oil . after the analysis of deflection sources in routine chromatogram of oil test , the paper brings into effect successfully the equipment on the base of characteristic infiltrative film monitoring six gases dissolved in transformer oil in the pingliang substation 2 # transformer . through analyzing a great deal practical data , it is proved that the monitoring system is stable and reliable , and has the ability to show the transformer ' s running state 论文通过对平凉110kv变电站实施主变压器油色谱在线监测及目前国内外对变压器油色谱在线监测技术的现状分析，结合影响常规油色谱测量结果及误差来源分析，在平凉变电站2 #主变压器上成功实施了以渗透气体膜原理为基础的变压器油中六种溶解气体在线监测及诊断装置，通过大量运行数据分析，系统运行稳定，能正确反映变压器的实际运行情况，并有效抓住了变压器的一次故障，可作为状态维修的依据。
Following the analysis of domestic and oversea present development , it demonstrates the importance of on - line monitoring system , discusses the principle of chromatogram analysis , the relationship between oil solved gas and fault types and methodologies of fault diagnosis , and also , analyzes the error leaded by monitoring system , its sources and correspondent interference suppression measures . fault diagnosis is a new research project . this thesis demonstrates the principle and feasibility of fuzzy math hybrid evaluation method based on threshold diagnosis , spectrum diagnosis , artificial neural network and expert system 故障诊断系统是比较新的课题，本文在分析阈值诊断、人工神经网络、专家系统优缺点的基础上，运用模糊数学的方法结合三比值法对故障诊断系统进行了改进，全面分析论证了运用模糊数学综合评判的方法的原理、可行性，在此基础上，运用结构化编程的思路，设计出程序框图，编制成具体的诊断系统运用在变压器油色谱的在线监测装置中，通过具体事例说明该诊断系统能够比较准确的分析判断变压器故障。
