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US 7,741,853 B2Granted
Differential-mode-current-sensing method and apparatus
AssigneeRockwell Automation Technologies, Inc.
InventorJohn Herman Blakely
Life of this patent
Estimating the term…
Abstract
Systems, methods, and devices are disclosed, including a ground-fault sensor that has a plurality of conductors each disposed one inside of another except for an outer conductor and a field sensor configured to sense an electric field, a magnetic field, or both. In some embodiments, the field sensor is disposed adjacent the outer conductor.
Claims25
A ground-fault sensor assembly comprising:
- an outer conductor having a longitudinal axis;
- a middle conductor disposed at least partially inside the outer conductor co-axially along the longitudinal axis;
- an inner conductor disposed at least partially inside both the outer conductor and the middle conductor co-axially along the longitudinal axis;
- and
- a transformer disposed adjacent the outer conductor.
2 more elements
A ground-fault sensor assembly comprising:
- an outer conductor having a longitudinal axis and configured to conduct a first phase in a three phase power;
- a middle conductor disposed at least partially inside the outer conductor co-axially along the longitudinal axis and configured to conduct a second phase in the three phase power;
- an inner conductor disposed at least partially inside both the outer conductor and the middle conductor co-axially along the longitudinal axis and configured to conduct a third phase in the three phase power;
- and
- a transformer disposed adjacent the outer conductor.
2 more elements
A ground-fault sensor assembly comprising:
- an outer conductor having a longitudinal axis and configured to conduct a first phase in a three phase power;
- a middle conductor disposed at least partially inside the outer conductor co-axially along the longitudinal axis and configured to conduct a second phase in the three phase power, wherein the outer conductor completely surrounds the middle conductor;
- an inner conductor disposed at least partially inside both the outer conductor and the middle conductor co-axially along the longitudinal axis and configured to conduct a third phase in the three phase power, wherein the middle conductor completely surrounds the inner conductor;
- and
- a transformer disposed adjacent the outer conductor.
2 more elements
Dependencies are inferred from the claim text.