The external insulation properties of bushings are more complicated compared with those of ordinary insulators. In order to study the influence and its mechanism of vertical electric field on the bushing structure pollution flashover

a simulation platform was established. In accordance with the occurrance of a bushing pollution flashover accident in indonesia

first

the process and causes of this accident were analyzed

and the properties of pollution flashover in this accident were summarized. Secondly

bushing samples based on real bushing were designed and the crucial parameters were verified. Then the samples in the presence or absence of vertical electric fields were tested using an artificial pollution test method. The properties and comparison in the presence or absence of vertical electric field samples were obtained under different equivalent salt deposit density and creepage length

and the real-time voltage-current waveforms was recorded. Lastly

a model of transformation of pollution flashover to slide flashover fitting strong vertical electric field structure characteristics was established. This model fits well with the phenomena in both actual accident and lab experiments.