Abstract:

The current status of health management for low voltage circuit breakers is introduced.The correlation between contact voltage,breaking duration,breaking energy,and contact bounce with the electrical life of the contact system of molded case circuit breakers is analyzed.Through the accelerated aging test on flexible conductor,the thermal aging curve of flexible conductor is obtained by fitting the experimental data.Based on the measurement data of angular velocity and angular displacement of the main shaft on air circuit breaker,the research shows that the degree of contact wear loss can be calculated through relevant parameters,and the false closing condition can be distinguished in the meantime.The analysis of the experimental results indicates the research direction of low voltage electrical appliances health management at this stage to lay a solid foundation for the smart product and industrial internet platform design.

Key words: health management, fault prediction, sensor, electrical lifespan, temperature rise test