Asynchronous Motor Integrated Intelligent Protection Device Developed

The motor is the source of power, therefore, it is important to protect the motor reliably and effectively. This thesis discusses the development of the advanced intelligent protection equipment for the asynchronous motor. The protection equipment makes the over-current value, zero-phase-sequence component, negative-phase-sequence component and so on as protection criterions ,in protection theory ; it reali7es the intelligent fault diagnosis based on the expert system; it makes Intel powerfull6-bit microprocessor 80C196MC as the core ,~ith which the lattice LCD is linked, in hardware. It has the follow characters: display in Chinese, operation ~~駎h menu-guided software, storage of fault data for fault recording, fault diagnosis, parameter setting simple and flexible, perfect protection functions and so on. Furthermore, a kind of Field Bus -桟AN Bus which has high reliability, simple framework and convenient programming functions, is applying to the motor protection equipment. Then we can build the motor protection network by CAN bus. A industiy PC is used as the network server, and all the protection equipments are used as network nodes. In this way, we really realize the automatic conlrol, the centralized control and the intelligent self disposal functions of the motor protection.