| Motor is the most widely used dynamic equipment in all fields. In the past, because the capacity of each motor is not very large, the importance of motor relay protection is not concerned seriously and the protective device often refuse to act and thus lead to the motor to be destroyed. In the past, in order to ensure the motor to operate safely, the workers were required to check the and maintain the equipment regularly. But this man-made method not only costs a great deal of manpower, material and financial resources but also unable to ensure to detect and fix the faults in time. So the important power device must be equipped with the operation state measurement and protective device.In recent years, with the development of computer technology and automation control theory, microcomputer-based relay protection device has come into being.Compared with traditional protective devices, this new type of protective devices has the powerful function of logical analyses and data treatment, easy to fulfill network management and other advantages, and has become the main direction of development of motor protection device.In this paper, the design of motor protection system of an intelligent motor controller and communication of the system is discussed.The main contents are included in this paper:1) The development and future of motor protection system;2) Quite a comprehensive discussion and analysis to frequently occurred troubles of the motor is provided;3) The hardware design and software design of the motor protection system based on AT89C52 are introduced;4) VB is adopted to develop the soft of communication between system and upper position machine based Modbus protocol.5) The problem of disturbance has been discussed. The methods of anti-disturbance are raised and applied,6) Give the summarization to the paper and indicate the drawback and the improvement.
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