Study on transient electric field of multi-layer composite insulation structure during polarity reversal

Abstract

Abstract Outgoing line device is an important structure of converter transformer. Multilayer composite insulation structure is widely used in the outgoing line device. Polarity reversal is special working state of converter transformer. In the process of polarity reversal, due to the influence of the space charge on the interface of composite insulation structure, there will be instantaneous high field strength, which threatens the normal operation of the outgoing line structure. In this paper, starting from the typical multi-layer composite insulation structure in the outgoing line device, the change rule of interface space charge and transient electric field in different polarity reversal time is analyzed under the condition of the equal temperature and temperature gradient. On this basis, the research object of the overall composite insulation structure of the outgoing line device is analyzed, and the change rule of the transient electric field in the process of polarity reversal is analyzed. The research in this paper can provide a theoretical basis for the development of the outgoing line structure of converter transformer.