介绍一种基于CAN总线的牵引变电站自动化系统通讯规约的设计，CAN通讯规约采用标准帧，报文采用主动发送和发送查询两种处理形式。该设计在城市轻轨与地铁牵引变电站中的应用表明：可实现间隔层和通讯处理层的数据快速、可靠的交换，提高牵引变电站的安全性和稳定性
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Abstract: This paper firstly presents a kind of design dealing with communicational protocol to the traction substation automation system based on CAN bus,and then comes up with the ideas that all frames of CAN communicational protocol should adopt the standard frame,and that messages be processed by two ways:sending initiatively and sending quiries.Subway and light rail application shows that the use of the CAN bus is possible to exchange data quickly and reliably between the layers of the middle and the communicational processing,hence to improve the safety and stability of traction substations. CAN总线 通讯规约所需积分：5
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