Distribution and influence factors of electric field in high-voltage power capacitor

Power capacitor works in series or parallel acts as a role of reactive power compensation and filtration in high-voltage power transmission. Once one capacitor is damaged, the whole unit even the entire system would fail to work. The breakdown parts of power capacitor component are generally occurred in the area where the electric field intensity is concentrated, so the electric field distribution of component needs to be calculated accurately. In this study, according to the inner structure of power capacitor component, the numerical simulation of inner electric field is carried on, and the electric field distribution characteristics are obtained. The factors that affect the electric field, such as, the medium material, electrode thickness and medium thickness are researched. Specially, the electric field distribution at component edge is given, and the relationship between voltage and medium breakdown field intensity is discussed. The results provide a theoretical basis for the design and operation of power capacitor.