160 kV耦合型机械式直流断路器的设计与应用

Design and Application of 160 kV Coupling Mechanical DC Circuit Breaker

南澳多终端柔性直流输电示范工程是世界上第一个多终端柔性直流输电系统,直流系统的故障电流上升快、幅值高且没有过零点,比交流系统故障电流更难中断,因此设计一个可靠的直流断路器是提高直流系统稳定性和可靠性的关键之一。介绍了南澳工程160 kV机械式直流断路器的原理、设计参数及具体的工程应用。

The Nan’ao Multi-Terminal Flexible HVDC demonstration project is the world’s first multi-terminal flexible HVDC system.Due to the fast rising speed,large amplitude and no zero-crossing point characteristics of DC fault current,the DC faults are more difficult do cut off than AC faults.Therefore,Therefore,designing a reliable DC circuit breaker is one of the keys to improving the stability and reliability of the DC system.In this study,the principle,design parameters and specific engineering applications of 160 kV mechanical DC circuit breakers for Nan’ao Project are introduced.