Power feed control device
First Claim
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1. A power feed control device comprising:
- a feed line connected between an external power supply and a load;
a switching device inserted in the feed line, said switching device being configured to make and break the feed line;
a zero-phase-sequence current transformer through which the feed line is passed, said zero-phase-sequence current transformer being configured to detect an unbalanced current in the feed line; and
a voltage detection circuit connected with the feed line between the load and a combination of the switching device and the zero-phase-sequence current transformer, said voltage detection circuit being configured to detect voltage of the feed line,wherein a branch line from the voltage detection circuit is inserted in the zero-phase-sequence current transformer in the direction from the load side to the external power supply side.
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Abstract
A branch wire L5 from the voltage detection circuit 14 is inserted in the zero-phase-sequence current transformer ZCT in the direction from the load side to the external power supply side. For this configuration, the zero-phase-sequence current transformer ZCT is to detect unbalance of the sum of current flowing in the first and second conductive wires L1, L2 and the current flowing in the branch wire L5. Therefore, the present invention can accurately detect occurrence of electrical leakage.
8 Citations
8 Claims
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1. A power feed control device comprising:
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a feed line connected between an external power supply and a load; a switching device inserted in the feed line, said switching device being configured to make and break the feed line; a zero-phase-sequence current transformer through which the feed line is passed, said zero-phase-sequence current transformer being configured to detect an unbalanced current in the feed line; and a voltage detection circuit connected with the feed line between the load and a combination of the switching device and the zero-phase-sequence current transformer, said voltage detection circuit being configured to detect voltage of the feed line, wherein a branch line from the voltage detection circuit is inserted in the zero-phase-sequence current transformer in the direction from the load side to the external power supply side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification