초록 ▼

A system to detect arcing faults in an electrical distribution system with a line conductor connected to a utility power transformer. The system monitors the rate of change of electrical current in the line conductor and produces a signal which represents the rate of change. The system produces a pu

A system to detect arcing faults in an electrical distribution system with a line conductor connected to a utility power transformer. The system monitors the rate of change of electrical current in the line conductor and produces a signal which represents the rate of change. The system produces a pulse each time the rate-of-change signal exceeds a selected threshold, filters the rate-of-change signal and/or the pulses to substantially eliminate a signal or pulse which represents changes in the electrical current outside a selected frequency range, monitors the remaining pulses to detect when the number of pulses that occur within a selected time interval exceeds a predetermined threshold, and generates an arc-fault-detection signal in response to the occurrence of a number of pulses which exceed the threshold within the selected time interval.

대표청구항 ▼

[What is claimed is:] [1.]monitoring the electrical signal on the line conductor in each of the branch circuits for the occurrence of an arcing fault;disconnecting the load from the power source in response to the occurrence of an arcing fault in any of said branch circuits; andblocking signals orig

[What is claimed is:] [1.]monitoring the electrical signal on the line conductor in each of the branch circuits for the occurrence of an arcing fault;disconnecting the load from the power source in response to the occurrence of an arcing fault in any of said branch circuits; andblocking signals originating from noisy loads and likely to be mistaken for arcing faults, from said sensor.