Arc fault circuit protection device with asymmetrical transformer
First Claim
1. A protection device for an electrical circuit, comprising:
- an asymmetrical transformer for producing a signal in response to an arc fault in said circuit; and
an arc fault detector connected to said transformer which receives said signal.
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Abstract
A protection device for an electrical circuit includes an asymmetrical transformer for producing a signal in response to an arc fault in the circuit; and an arc fault detector connected to the transformer which receives the signal. The asymmetrical transformer preferably includes a primary winding of the asymmetrical transformer being formed by a hot conductor and a neutral conductor of the electrical circuit. An asymmetry of a symmetrical secondary winding is produced by placing an asymmetrical tap into the symmetrical secondary winding of the transformer. The tap receives an asymmetrical part of common mode core flux to produce the signal, while the symmetrical secondary winding receives full common mode flux but in equal and opposite directions so as not to produce a signal.
60 Citations
15 Claims
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1. A protection device for an electrical circuit, comprising:
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an asymmetrical transformer for producing a signal in response to an arc fault in said circuit; and
an arc fault detector connected to said transformer which receives said signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
a primary winding of said asymmetrical transformer being formed by a hot conductor and a neutral conductor of said electrical circuit;
a symmetrical secondary winding of said transformer;
wherein an asymmetry of said symmetrical secondary winding is produced by placing an asymmetrical tap into said symmetrical secondary winding of said transformer, such that said tap receives an asymmetrical part of common mode transformer core flux to produce said signal, whereas said symmetrical secondary winding receives full common mode flux but in substantially equal and opposite directions so as not to produce a signal.
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12. A protection device according to claim 11, wherein said transformer produces a second signal in response to a ground fault in said electrical circuit.
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13. A protection device according to claim 12, further comprising a ground fault detector which receives said second signal.
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14. A protection device according to claim 11, wherein symmetrical secondary winding connects to a ground fault detector.
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15. A protection device according to claim 11, wherein an arc fault detector is connected to one end of said asymmetry of said symmetrical secondary winding.
Specification