Automated Diagnosis of Insulation State for High-Frequency High-Voltage and High-Power Transformers
In the process of power equipment maintenance,the automatic diagnosis technology is used to check and maintain the transformer regularly to ensure the insulation performance and stability of the transformer.Therefore,the automatic diagnosis method of insulation state of high-frequency high-voltage and high-power transformer is proposed.Firstly,the simple circuit structure of transformer is constructed,and the winding DC resistance fault is concentrated on the three-phase imbalance coefficient,and its coefficient is corrected to extract the insulation state characteristics of high-frequency,high-voltage and high-power transformer.Secondly,the mapping function between qualitative state and quantitative index is constructed,and the insulation state grade of transformer is divided on the basis of this function.Finally,the correlation between each index and insulation state is calculated,and the maximum correlation value is calculated according to the maximum correlation standard of transformer insulation state,so as to diagnose the insulation state of high-power transformer.The experimental results show that the test results under the research method basically coincide with the residual voltage values of the oil-paper insulation samples set in the experiment.This method can accurately diagnose the insulation status of transformers.
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