Research on Transient Over-Voltages of High-Speed Train Passing Articulated Split-Section Insulator

The electromagnetic transient processes generated as a high-speed train (HST) passes the articulated split-section insulator cause over-voltages on the train roof and train body (TB), and thereby, an adverse effect is exerted on the electronic equipment. By this view, this article focuses on identifying the root causes and influencing factors pertinent to over-voltages. To begin with, the state-space analysis method is adopted to examine the probability and characteristics of arcing. Subsequently, the integrated vehicle-grid models associated with the split-section arcing are established to precisely simulate the over-voltage phenomenon in the independent transient processes of entering and leaving the insulator. The obtained results indicate that the hazardous over-voltages can be easily produced, and the behaviors of surges on the TB are very similar to that in the processes of rising and dropping pantograph. The influences of different variables, including the feeder phase, vehicle speed, lifting height, TB grounding pattern, and other HST’s simultaneous arcing impacts, are further revealed to discuss possible over-voltage suppression measures.