Study on DeviceNet communication mechanism and its application in protection measurement and control

To fit in with the developing requirement of integrated functions of protection measurement, control and communication of protective relays,a protection measurement and control system based on DeviceNet fieldbus is designed.The communication mechanism of DeviceNet is studied and data trigger modes.communication connection,message types and other key technologies are analyzed.The object modeling and device description of the device are realized too.Results of network test,dynamic simulation and test in the field indicate that this system can accomplish all the communication tasks in real time and can make precise response to every kind of faults of the motor,transformer,line and capacitor.Moreover,this system has higher measurement precision and better control capability.