Method and apparatus for differentially sensing ground fault and individual phases
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United States of America Patent
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Jun 18, 2002
Grant Date -
N/A
app pub date -
Nov 5, 1999
filing date -
Nov 5, 1999
priority date (Note) -
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Abstract
An apparatus (110) (FIG. 1) for differentially sensing a ground fault in a power distribution circuit is configured to route a plurality of power signals, the power signals when summed resulting in a zero sum signal. The apparatus (110) includes a circuit element (e.g., a resistor) (128), first and second current transformers (CTs) (112, 114, 116), and a routing circuit (118). The first and second current transformers (112, 114, 116) are configured to sense first and second power signals and to generate first and second sense signals representative of the first and second power signals, respectively. The routing circuit (118) is configured to receive the first and second sense signals to provide a residual signal across the circuit element (128).
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