The Condition Montoring And Fault Diagnosis Of Power Transformer

This thesis disusses the current states and the matter of the transformer condition monitoring and diagnosis fault.Afer analying that DGA can only reflect the fault type but can't confirm the fault location,part-discharging signal can realize fault location in theory but can't be carried out easily for the inconstant influence of circumstance,We present a method that conbinates the oli-gas and electric quanlities to monitor the transformer.Using on-line monitoring of oli-gas conform the fault type.Using on-line electric quanlities confirm the fault location.With this method,a fault diagnosis system and corresponding diangnosis flow are proprosed.The main work of this thesis consists of the following parts:1. After analying the current states of transformer on-line minitoring and diagnosis fault,presents a mothed that conbinates the oli-gas and electric quanlities to monitor the transformer.2. Prosprosing a tansformer winding model to judge whether the transformer has come into bing interturn short circuit and the degree of interturn short circuit,and providing an availability for condition monitoring of transformer that improves the accuracy of condition monitoring and fault diagnosis.3. The accuracy and invalidity of diagnosis of fault positions and fault characters of power transformer would be improved greately if reasoning and analyzing the operation records and oringnal datums of transformer.4. With this method,proproses a condition monitoring and fault diagnosis device and provides the realization of hardware and software based on the above principium.5. Some problems about the transition from time maintenance to condition based maintenance are discussed.