Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Reexamination Certificate
2011-05-17
2011-05-17
Patel, Dharti H (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
C361S042000, C361S044000
Reexamination Certificate
active
07944654
ABSTRACT:
A multi-pole circuit breaker for a power distribution system having multiple line conductors carrying AC currents that are out of phase with each other, and a common neutral conductor, comprises first and second current sensors, a ground fault detection circuit, and an arcing fault detection circuit. The first current sensor is adapted to be coupled to both of the line conductors and to the neutral conductor and produces a first output signal indicative of the resultant of the electrical currents flowing in the line and neutral conductors. The ground fault detection circuit receives the first output signal and produces a trip signal in response to the detection of a ground fault. The second current sensor comprises a coil wound on a toroidal core and is adapted to be coupled to both of the line conductors in a manner that the electrical currents in the line conductors flow in opposite directions inside the toroidal core, thus inducing in the coil a second output signal that is a function of the difference of the electrical currents in the line conductors. The arcing fault detection circuit receives the second output signal and includes a processor programmed to analyze the second output signal and produce a trip signal in response to the detection of an arcing fault.
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Gass Randall J.
Scott Gary W.
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