Multistage power supply switching method and system

The invention provides a multi-stage power supply switching method and system, and the method employs a quick circuit breaker, achieves the information interaction between upper and lower stage power supply switching devices and between the power supply switching devices and the quick circuit breaker based on a 100M Ethernet, and completes the synchronous starting strategy of the upper and lower stage power supply switching devices. The success rate of quick switching of the power supply switching device is improved, and the operation reliability of an enterprise power grid is improved on the whole. 本申请提供一种多级电源切换方法和系统，通过采用快速断路器、基于百兆以太网实现上下级电源切换装置间以及电源切换装置和快速断路器之间的信息交互机制，完成上下级电源切换装置同步启动策略等，提高了电源切换装置快速切换的成功率，总体上提高了企业电网的运行的可靠性。