Current sensing apparatus
First Claim
1. A current sensing apparatus suitable for sensing the amount of A.C. current flowing in one pair of wires of a power feeder cable, comprising:
- (a) a magnetically permeable core means concentrating the magnetic field lines of flux occurring between said pair of wires generated by a current flowing in said pair of wires of said power feeder cable by centrally disposing said core means between said pair of wires, said core means including;
(i) at least two pole means, and(ii) air gap means, said air gap means being disposed between said pole means and sufficiently large to receive said pair of feeder cable wires therebetween; and
(b) a single coil means disposed upon said core means for generating an induced voltage in response to said current flow in said pair of wires.
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Accused Products
Abstract
A current sensing apparatus suitable for sensing the amount of current flowing in a power feeder cable without the necessity for any ohmic connection between the meter and the circuit being measured that does not require separation of the wires in a cable and in fact utilizes both current carrying wires simultaneously includes a magnetically permeable core suitable for concentrating the magnetic fields generated by the current flowing in the pair of wires and includes a single coil disposed upon the core. The core includes a pair of poles which are placed proximate to the feeder cable and the coil yields an induced output voltage proportionate to the current flowing in the feeder cable and may be held in position on the feeder cable with the aid of a resilient member which permits ready removal of the sensing apparatus.
36 Citations
21 Claims
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1. A current sensing apparatus suitable for sensing the amount of A.C. current flowing in one pair of wires of a power feeder cable, comprising:
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(a) a magnetically permeable core means concentrating the magnetic field lines of flux occurring between said pair of wires generated by a current flowing in said pair of wires of said power feeder cable by centrally disposing said core means between said pair of wires, said core means including; (i) at least two pole means, and (ii) air gap means, said air gap means being disposed between said pole means and sufficiently large to receive said pair of feeder cable wires therebetween; and (b) a single coil means disposed upon said core means for generating an induced voltage in response to said current flow in said pair of wires. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of determining the amount of A.C. current flowing in a pair of wires of a feeder cable, comprising the steps of:
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(a) providing a current sensing apparatus having a magnetically permeable core means including a single coil means disposed on said core means, said core means having at least two pole piece means, said pole piece means, (i) extending in one plane, (ii) being transversely to other portions of said said core means, (iii) being sufficiently spaced apart to receive said feeder cable; (b) palcing one of said pole piece means of said current sensing apparatus above and one pole piece means below said feeder cable with said pole piece means extending longitudinally along said feeder cable and centrally disposed between said pair of wires for concentrating magnetic lines of flux generated by said current flowing in said pair of wires; and (c) connecting said coil means to a device capable of measuring a voltage induced in said coil means; and (d) converting said voltage to a current reading.
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Specification