Study On Application Of Multi-Characteristic Vectors On-Line Monitoring In Transformer Of Gezhouba Power Station

Power transformer on-line monitoring is presently the research hotspot in the area of high-voltage insulation measurement and diagnosis. Before the transformer insulation fault, it most has a certain period of fault development and various signs of pre-performance of equipments' electrical, physical, chemical and other characteristics which have small gradual changes, such as partial discharge, oil-dissolved gas overproof, core earthing current abnormal . The paper based on partial discharge, oil-dissolved gas and core earthing current multi-characteristics vectors the transformer on-line monitoring and analysis for early detection of failure to prevent the further expansion of fault has a major role in, greatly improved the diagnosis of transformer insulating the timeliness and accuracy.Bases on multi-characteristics vectors on-line monitoring system application in transformer insulation, the paper analysed on-line monitoring principle and method of transformer partial discharge, oil-dissolved gas and the core earthing current; discussed the principle of high frequency current sensor and tested the characteristics. The paper adoped the related functions of the frequency domain to identify periodic interference in transformer partial discharge on-line monitoring system, and designed of the IIR grid-shaped notch filter to inhibit it. A fuel gas sensor and the oil-gas separation membranes excellent performance is analyzed.Finally, the paper analysed Gezhouba Power Station 251 B transformer insulation on-line monitoring system practical operation, on-site monitoring and diagnosis results show that: the whole system runs stable, safe and reliable, the testing data have a certain accuracy, which can complete the partial discharge, gas chromatography, core earthing current collection, analysis, query and other functions, it is satisfied with the demand of engineer application.