Study on operation voltage monitoring and electrothermal coupling simulation of electric multiple unit (EMU) roof arrester

The roof arrester of electric multiple units (EMU) can efficiently limit the overvoltage, and ensure safe operation EMU electrical equipment. In process high-speed operation, traction power supply system is often affected by overvoltage. addition, explosion accidents occasionally occur. this paper, on-line voltage measurement developed. By analysing a large number waveforms, abnormal divided into three categories: over-phase voltage, high harmonic steep impulse characteristics waveforms are then summarised. electrothermal coupling simulation model developed, current response temperature distribution under calculated. impact energy on studied applying triangular wave to model. Finally, some suggestions proposed for maintenance arrester.