基于磁—结构场耦合的干式直流电容器短路特性分析OA

Dry-type DC capacitors,as a key equipment in VSC-HVDC transmission system,are used widely in such important applications as filtering and voltage support.It is of great significance to ensure the long-term,safe and re-liable operation of dry-type DC capacitors.In case of external short-circuit fault in the capacitor,the rapidly in-creased short-circuit curren will flow through the internal busbar and result in great electrodynamic force,which easi-ly cause structural failure of the capacitor.In order to study the issue of capacitor withstanding short-circuit electrody-namic force under short-circuit current impact,in this paper a type of dry-type DC capacitor is taken as the research object,the short-circuit electrodynamic force distribution,deformation as well as stress of the capacitor under short-circuit conditions are calculated and analyzed based on calculation method of magnetic-structure field coupling.The results show that in case of external short-circuit fault,the maximum short circuit electrodynamic force of the capaci-tor reaches 10.8 kN.The deformation of the capacitor mainly occurs on the leading-out copper busbar and its sur-rounding areas,and the deformation approaching the middle part of the busbar is larger.The leading-out terminal shows an obvious downward squeezing trend.The research results in this paper provide theoretical reference for me-chanical strength check and structural optimization design of capacitor.