Development of contact temperature online monitoring devices for mobile circuit breakers of air insulated high-voltage switchgears

In order to prevent the contacts of mobile circuit breakers of air insulated high-voltage switchgears from burning down due to bad contact,an online monitoring device for circuit breaker contact temperature and environmental humidity and temperature is developed based on technologies of information coding,modulation and demodulation,and wireless transmission.The device realizes its monitoring functions without decreasing the insulation level of the switchgear.With the device,a real-time data acquisition and monitoring system for circuit breaker's contact temperature increase can be formed.