不同含量谐波电流作用下变压器振动特性分析OA北大核心

The harmonic current flowing through the winding of transformer has a great influence on the vibration.On this basis,the influence of harmonic current on the vibration is studied emphatically.Through theoretical deriva-tion,the cause of the vibration harmonics of transformer winding are described from the aspect of electromagnetic ex-citation.The harmonic loading system of the transformer is set up,and the variation of vibration characteristics and the vibration characteristic parameters under the action of harmonic current with different contents are compared.Based on the vibration online vibration monitoring system,the variation of vibration characteristic parameters with time sequence,magnitude and sequence of current as well as the influence of harmonics on vibration are studied.The study results show that the harmonic current causes the winding vibration and the vibration harmonic content to increase,and the different vibration characteristic parameters have a certain correlation with the total distortion rate of the harmonic current.The influence of the magnitude of current and the total distortion rate of the harmonic must be taken into ac-count in the mechanical condition monitoring and fault diagnosis of the winding of transformer by the vibration method.