Ground fault circuit interrupter and method
First Claim
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1. A ground fault circuit interrupter having a single current transformer and self test capabilities, comprising:
- a state machine that performs one or more self-test functions; and
one or more detectors coupled to the state machine, wherein the state machine and the one or more detectors operate in response to a signal from the single current transformer of the ground fault circuit interrupter having the single current transformer;
a silicon controlled rectifier test circuit coupled to the state machine;
a ground fault test circuit coupled to the state machine, wherein the ground fault test circuit interrupts current flow in the single current transformer in response to the signal from the single current transformer indicating another fault condition, and wherein the ground fault test circuit includes a first switch connected to a neutral conductor and a second switch connected to a line conductor, the ground fault circuit test circuit configured to open and close the first switch and the second switch.
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Abstract
A ground fault interrupter circuit and a method for operating a ground fault interrupter that includes configuring the ground fault interrupter to perform a plurality of self tests. The ground fault interrupter may be configured to perform a ground fault self test, a grounded-neutral self test, and a trip circuit self test.
42 Citations
21 Claims
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1. A ground fault circuit interrupter having a single current transformer and self test capabilities, comprising:
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a state machine that performs one or more self-test functions; and one or more detectors coupled to the state machine, wherein the state machine and the one or more detectors operate in response to a signal from the single current transformer of the ground fault circuit interrupter having the single current transformer; a silicon controlled rectifier test circuit coupled to the state machine; a ground fault test circuit coupled to the state machine, wherein the ground fault test circuit interrupts current flow in the single current transformer in response to the signal from the single current transformer indicating another fault condition, and wherein the ground fault test circuit includes a first switch connected to a neutral conductor and a second switch connected to a line conductor, the ground fault circuit test circuit configured to open and close the first switch and the second switch. - View Dependent Claims (2, 3, 4, 5)
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6. A method for self testing a ground fault circuit interrupter having a single current transformer, comprising:
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monitoring a plurality of input signals to the ground fault circuit interrupter in response to a current flowing through the single current transformer of the ground fault circuit interrupter; performing a differential self test in response to a first input signal of the plurality of input signals; opening a set of contacts to terminate a flow of the current through the single current transformer in response to the first input signal indicating that the ground fault circuit interrupter has failed the differential self test; performing a grounded-neutral self test in response to a second input signal of the plurality of input signals; opening a set of contacts to terminate a flow of the current through the single current transformer in response to the first input signal indicating that the ground fault circuit interrupter has failed the grounded-neutral self test; performing a trip circuit self test in response to a third input signal of the plurality of input signals; and opening a first switch or a second switch to terminate a flow of the current through the single current transformer in response to the first input signal indicating that the trip circuit interrupter has failed the trip circuit self test. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for operating a ground fault circuit interrupter having one current transformer comprising:
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performing a plurality of self tests in the ground fault interrupter in response to a current signal from the one current transformer of the ground fault circuit interrupter; opening a set of contacts to terminate a flow of a current through the one current transformer in response to one or more of the self tests indicating that the ground fault circuit interrupter has failed. - View Dependent Claims (19, 20, 21)
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Specification