Autoranging faulted circuit indicator
First Claim
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1. A fault indicator comprising:
- sensing means for sensing current in a cable;
reset means responsive to said sensing means for producing a reset indication in response to a minimum current;
trip means responsive to said sensing means for producing a trip indication in response to the current exceeding a selected trip value; and
selecting means in said trip means for sensing the average value of the current and selecting a trip value as a predetermined multiple of the average value.
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Abstract
The disclosed fault indicator which senses current in a cable, resets in response to a minimum current and trips when the current exceeds a predetermined multiple above the average value of the current. A trip circuit senses the average value by periodic current sampling or by continuous current averaging. Maximum and minimum trip setting limit the excursion of the multiple of the average value.
64 Citations
18 Claims
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1. A fault indicator comprising:
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sensing means for sensing current in a cable; reset means responsive to said sensing means for producing a reset indication in response to a minimum current; trip means responsive to said sensing means for producing a trip indication in response to the current exceeding a selected trip value; and selecting means in said trip means for sensing the average value of the current and selecting a trip value as a predetermined multiple of the average value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power distribution system, comprising:
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a plurality of cables; a circuit breaker connecting said cables to a power source; a plurality of fault indicators coupled to said cables; each of said fault indicators including sensing means for sensing current in the cables; each of said fault indicators including reset means responsive to said sensing means for producing a reset indication in response to a minimum current; each of said fault indicators including trip means responsive to said sensing means for producing a trip indication in response to the current exceeding a selected trip value; and each of said fault indicators including selecting means in said trip means for sensing the average value of the current and selecting a trip value as a predetermined multiple of the average value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification