CAPACITANCE REJECTING GROUND FAULT PROTECTING APPARATUS AND METHOD
First Claim
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1. A method of controlling a load in response to a ground fault condition, said method comprising the steps of:
- measuring a ground fault alternating current flowing from the load;
ascertaining a real part and an imaginary part of the ground fault alternating current; and
at least one of removing electrical power from the load and indicating the ground fault condition to a user if at least one of;
a magnitude of the real part exceeds a first predetermined threshold; and
a magnitude of the imaginary part exceeds a second predetermined threshold.
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Abstract
A method of controlling a load in response to a ground fault condition includes measuring a ground fault alternating current flowing from the load. A real part and an imaginary part of the ground fault alternating current is ascertained. Electrical power is removed from the load and/or the ground fault condition is indicated to a user if a magnitude of the real part exceeds a first predetermined threshold and/or a magnitude of the imaginary part exceeds a second predetermined threshold.
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Citations
20 Claims
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1. A method of controlling a load in response to a ground fault condition, said method comprising the steps of:
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measuring a ground fault alternating current flowing from the load;
ascertaining a real part and an imaginary part of the ground fault alternating current; and
at least one of removing electrical power from the load and indicating the ground fault condition to a user if at least one of;
a magnitude of the real part exceeds a first predetermined threshold; and
a magnitude of the imaginary part exceeds a second predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19)
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12. A ground fault circuit interrupter apparatus, said apparatus comprising:
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a ground fault current detector configured for measuring a ground fault current from a load and producing at least one ground fault signal indicative thereof, and an automatic control circuit connected to said ground fault current detector, said control circuit being configured for;
receiving said at least one ground fault signal;
ascertaining a real part and an imaginary part of the ground fault current dependent upon said at least one ground fault signal; and
at least one of removing electrical power from the load and indicating a ground fault condition if at least one of;
a magnitude of the real part exceeds a first predetermined threshold; and
a magnitude of the imaginary part exceeds a second predetermined threshold.
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20. A method of detecting a ground fault condition, said method comprising the steps of:
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making a plurality of ground fault current measurements, each said ground fault current measurement being made at a respective point in time;
calculating an average of said ground fault current measurements; and
comparing said average to a predetermined threshold value.
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Specification