面向变压器内部状态监测的"便利贴式"磁场取能装置功率特性分析与优化OA

With the increase of electricity load,problems such as internal vibration and heating,partial discharge,and winding inter turn short circuit often occur in transformer substations.Real time monitoring of the internal status of transformers has become inevitable.However,the internal space of transformers is limited,and traditional battery powered monitoring terminals have a short lifespan and are difficult to replace.The existing electromagnetic field energy harvesting devices have a large volume and lack installation conditions.Therefore,this article focuses on the working scenario of transformer windings being wound tightly against the magnetic core on one side,and solves the problem of traditional CT type magnetic field energy harvesting devices requiring looped current conductors for energy harvesting.A simple"convenience stick"magnetic field energy harvesting device structure is proposed.In order to improve the energy harvesting power characteristics,clarify the key influencing factors and design directions,a multi-layer stacked magnetic flux calculation method is proposed,and an accurate power characteristic calculation model is constructed to analyze the impact of different turns and winding methods of the energy harvesting device on the energy harvesting power.Simultaneously considering the changes in the position of the energy harvesting device caused by installation and transformer vibration,this study explores the attenuation characteristics of the energy harvesting output power under deflection conditions,and proposes an optimal turn number configuration strategy for high degree of freedom energy harvesting power.The"sticky note"magnetic field energy harvesting device designed in this article can ensure stable power supply to the monitoring terminal and achieve real-time monitoring and alarm of the internal status of the transformer.