Methods and apparatus for continuous ground fault self test
First Claim
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1. A ground fault detection device comprising:
- a sense coil to detect current in a line conductor and a neutral conductor, the sense coil comprising a winding influenced by a current difference between the line conductor and the neutral conductor;
a current bypass to facilitate a continuous current imbalance during both halves of a power-line cycle which is detected by the sense coil; and
a ground fault detector circuit to detect at least one of the continuous current imbalance in the sense coil or a ground fault current imbalance wherein the ground fault detector circuit utilizes the current in the current bypass for operating power and to continuously test proper operation of the entire ground fault detection device.
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Abstract
Methods and apparatus for continuous ground fault self-test are disclosed. An example ground fault detection device includes a sense coil to detect current in a line conductor and a neutral conductor, the sense coil comprising a winding influenced by a current difference between the line conductor and the neutral conductor. The example ground fault detection device also includes a current bypass to facilitate a continuous current imbalance detected by the sense coil, and a ground fault detector circuit to detect at least one of the continuous current imbalance in the sense coil or a ground fault current imbalance.
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9 Claims
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1. A ground fault detection device comprising:
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a sense coil to detect current in a line conductor and a neutral conductor, the sense coil comprising a winding influenced by a current difference between the line conductor and the neutral conductor; a current bypass to facilitate a continuous current imbalance during both halves of a power-line cycle which is detected by the sense coil; and a ground fault detector circuit to detect at least one of the continuous current imbalance in the sense coil or a ground fault current imbalance wherein the ground fault detector circuit utilizes the current in the current bypass for operating power and to continuously test proper operation of the entire ground fault detection device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification