Large Rectifier Device For Remote Maintenance System Realization

With maximization and complexity of the rectifiers, the fault diagnosis and maintenance of rectifiers become more and more complex. It also has more and more higher requirement, for the technical level of maintenance worker. Thus, it is important to apply in the remote maintenance technology, for improving operation efficiency and ensuring safe operation.The main research is as follows:1) A general design scheme of remote maintenance system in large rectifiers is proposed under the information integrated GPRS/SMS/Internet environment. In the local maintenance, the system is responsible for data collection, monitor and simple fault diagnosis based on C/S mode. In the remote maintenance, the system is responsible for data exchange, complex fault diagnosis, expert consultation, remote maintenance and management of equipments through the web server.2) An fault diagnosis and maintenance expert system is developed based on frame-rule hybrid knowledge representation, considering various kinds of faults with wide-ranging distribution existed in large capacity rectifiers. The frame work is used to represent designability and descriptive knowledge, the rule mode is used to represent process knowledge, and the mathematical mode is used to represent circuit fault knowledge. Binding of the knowledge representation and forward inference mechanism, Quick and high efficient fault diagnosis for rectifier are carried out by the expert system, and expert-level maintenance recommendations are suggested.3) For reducing maintenance costs in rectifiers and overcoming the flaw of system reliability neglected by Equal interval Preventive Maintenance (PM) models, A hybrid failure rate evolution rule was developed based on the concept of age reduction factor and failure rate increase factor to predict the evolution of the system reliability in different maintenance phases. Based on comprehensive consideration of major overhaul costs, minor overhaul costs, a sequential preventive maintenance model is proposed with the consideration of optimized maintenance schedule in a finite time horizon. By using optimization model to simulate, the periodic arrangement of optimal preventive maintenance is obtained, and the maintenance cost is lowest.4) A remote maintenance software is developed in large capacity rectifiers based on C/S mode and B/S mode. The part of C/S mode can configure equipment parameter, structure parameters, input/output parameters, protocol and on-line fault diagnosis and maintenance of rectifiers. The part of B/S mode can realize remote monitoring and fault recurrence of rectifiers. Customers can complete remote fault report and the maintenance of rectifiers, by using the software.