The research on electrical life test condition of relay with electromotor load

This paper presents research on the condition of voltage and current when the relay, loaded with an AC single-phase asynchronous motor (SPAYM), turns on and off. According to the arc model and equivalent model of SPAYM during its operation, the dynamic changing process of voltage across the contacts and loop current (when the relay turns on and off) are theoretically analysed and simulated by means of a computer. Furthermore, the conclusions are compared with the actual measured results. The electrical life test condition of relay is consequently obtained from this. Finally, a computer control test device is presented.