Study on intelligent channel switching system based on transmission delay equalization method for differential protection communication

This paper presents an intelligent channel switching system based on transmission delay equalization for the differential protection communication in power systems. In modern power grid, unhealthy channel conditions always hinder the development of the differential protection. The delay equalization method can sum up benefit of every single channel and improve the performance of the whole multi-channel system. Besides, the channel switching system also includes other major techniques such as precise clock synchronization, adaptive communication protocol conversion, real-time estimation and decision of channel conditions. The system provides a way to switch seamlessly between multiplex channels. It is important and practical to make an intensive study on this technique for better performance of the protection communication.