Test Condition Of Relay With Electromotor Load And Computer-Controlled Test Device

As a kind of typical controlling apparatus, the relay is widely used in many control systems. The relay test is the main means of testing the relay's quality. In all test, the electric life is one of most important test. Through the electrical life testing of relay, not only the index of relay's electrical life can be obtained, but the main causes of failures of relay can be found, an important basis can be provided for product design.Along with the increase in the area of application relay, higher and higher demands will be raised on the technical indicators of relay. It's the foundation to study the work performances of relay in the various load conditions and determine accurate test conditions for developing high-performance test equipment and test research. Through continuous technological innovation, in-depth study of various relay failures and the real reasons for the failures, to increase intelligent and common of test equipment, is an important focus in the overseas and domestic investigative fields.In this theme, the main tasks are performed in the following aspects.The contact electrical mathematical model was established from the arc theory angle. Through the dynamic analysis of the typical single-phase double value capacity asynchronous motor, established the mathematical model. The test condition of relay controlling this kind of load was gotten through the simulation and actual survey. Based on the energy invariable principle, the computational method of the start experiment current duration was elaborated.The failure level of relay contact directly related to arcing time and energy released with the arc. With typical low-power DC motor as a load, the measurement technology of arcing time and energy released with the arc was explored. Hardware and software design for contact arc acquisition ard was introduced, using TMS320F2812 as core. The research on arc characteristics, is of great significance to improving the performance of electric life test equipment and electric life prediction research.Based on the test conditions of electric life, test device of relay electric life with electromotor load has been developed with industrial PC as a center. The hardware design of the simulated load device, computer monitoring and controlling of relay electric life test device was introduced. In terms of software, testing program design in LabVIEW environment was realized, and testing program in DOS environment was preserved as a choice.