Development of a Novel Circuit Breaker Closing Resistance Instrument

A novel circuit breaker closing resistance instrument is designed in this paper. Super capacitor was used as test power source, and a digit signal processor as microcontroller, moreover AD526 and LM324 were used for signal amplifying and filtering. On-chip Analog-Digital converter was used to acquire voltage data. Closing resistance, loop resistance, and pre-insertion time can be measured in one closure using the instrument. Experiment results show the instrument's high precision and high reliability. Besides, the instrument is very practical and easy to use in field.