METHODS AND APPARATUS FOR OPERATING AN ELECTRONIC TRIP DEVICE
First Claim
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1. An electronic trip device comprising:
- a test signal generator coupled to at least one of a line conductor and a neutral conductor and configured to create a test signal; and
a leakage current detection circuit configured to compare a current in the line conductor and a current in the neutral conductor, the leakage current detection circuit configured to generate an error signal if the test signal is not detected.
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Abstract
An electronic trip device is described that includes a test signal generator coupled to at least one of a line conductor and a neutral conductor and configured to create a test signal. The electronic trip device also includes a leakage current detection circuit configured to compare a current in the line conductor and a current in the neutral conductor, the leakage current detection circuit configured to output an error signal if the test signal is not detected.
47 Citations
20 Claims
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1. An electronic trip device comprising:
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a test signal generator coupled to at least one of a line conductor and a neutral conductor and configured to create a test signal; and a leakage current detection circuit configured to compare a current in the line conductor and a current in the neutral conductor, the leakage current detection circuit configured to generate an error signal if the test signal is not detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating an electronic trip device coupled within an electric circuit that includes a line conductor and a neutral conductor, said method comprising:
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creating a test signal within at least one of the line conductor and the neutral conductor; measuring a current flow within the electric circuit; and generating an error signal if the test signal is not detected in the measured current flow. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification