Abstract: An online monitor is provided including a sensor to measure current through a circuit breaker trip coil, and a processor configured to sample reference samples from the sensor during a first tripping sequence to generate a reference trip coil current signature waveform (“TCCSW”), compute a reference sample value for each reference sample, and add the reference sample values corresponding to a reference area to determine a reference area value. The processor is further configured to respond to detection of a second tripping sequence by sampling measured samples from the sensor to generate a measured TCCSW, computing a measured sample value for each measured sample, adding the measured sample values corresponding to a measured area to determine a measured area value, and determine whether a difference percentage between the reference area value and the measured area value exceeds an alarm limit.

Abstract: A circuit breaker monitoring system may monitor both at least one gas characteristic of a gas surrounding the circuit breaker and at least one fault arc energy characteristic. The monitored characteristics may be used to forecast maintenance events. The monitored characteristics may be used to control the operation of the circuit breaker.

Abstract: An apparatus for generating a signal representing one of the density and the pressure of gas within a high voltage circuit breaker based on a dial position of a pressure switch includes a clip configured to mechanically couple to the dial, the clip including a magnet, and lens assembled into the switch between the switch housing and an outer component of the switch. The lens includes a sensor positioned within a cavity of the lens in alignment with the clip magnet to detect the position of the pressure switch dial from a magnetic orientation of the magnet, and circuitry for converting the detected position into an electric signal.

Abstract: A circuit breaker monitoring system may monitor both at least one gas characteristic of a gas surrounding the circuit breaker and at least one fault arc energy characteristic. The monitored characteristics may be used to forecast maintenance events. The monitored characteristics may be used to control the operation of the circuit breaker.