Research on Over-voltage of the Articulated Phase Insulator on Overhead Contact System

An articulated phase insulator is a new type one suitable for locomotive running in high-speed,which can avoid the evident hard spots coming from device-type neutral sections.Now,articulated phase insulators have been applied in most of high-speed railway lines in the world.The paper introduces a 7-span articulated phase insulator,analyzes the causes of the over-voltages,calculates the over-voltage of the insulator,makes simulation of the over-voltage and provides a protection scheme of the over-voltage.