Comprehensive Transmission Plan Of Traction Substation Information

The traction substation, as the power pivot of the electrified railway, is very important to the entire railway system.Nowadays,majority traction substations add the "remote video" function to the traditional functions of remote control, measure, communication and dispatch. At present, as a result of limitation of the band width,each kind of information still separately transmits in the most traction substation. The remote video signals don't transmit through the telecontrol network but rather the private entryway. It is not suit to the railroad communication system. So, it is a tendency that the remote video and the motion signals transmit together.Because the development of railway system in deferent regions is imbalance, and new network technologies applied in railway system communication also is limited. So it still has many problems in fulfilling the demands of power system integrative information transmission, and the QoS operation of network is the first important problem. Flow control can excellently improve the QoS of integrative information transmission.Firstly, this paper generalizes an overview of the development and current status of the research on the transmission of informations, and thoroughly analyzes the QoS which exists in the railway power system. The ring-like correspondence network of comprehensive information transmission scheme is designed according to practical situation of power supply system of electrified railway. Based on the SPDNet digitized comprehensive transmission scheme, a distributed and hierarchical traction substation information network platform is constructed. After discussing some QoS realization methods, three plans are designed. The methods which set priority and take different bandwidth for different operations can assure the reliability of the plans. The test results show that the three plans can achieve comprehensive information transmission.