Electric field distribution and optimization of dry type transformer airway under lightning impluse
The 110 kV epoxy resin dry type transformer has the phenomenon of flashover in the airway on the high voltage side due to its high electric field intensity.The high voltage side coil of transformer was modeled and simulated by finite element simulation software in this paper,and the standard lightning impulse was applied to verify the lightning impulse.According to the simulation results,the causes of flashover were analyzed and the field strength distribution at the airway was optimized.The results show that the electric field distribution is improved by adding a specific medium to the corresponding area inside the epoxy resin.At the same time,by changing the relative dielectric constant and position of the medium,the maximum field strength at the airway is reduced by 8.75%under the restriction of field strength inside the transformer,which meets the field strength requirement of the high-voltage side airway of the dry-type transformer to inhibit flashover.
dry type transformerairwaylightning impulseelectric field distribution
万方数据
维普
