DC FEEDER PROTECTION SYSTEM
First Claim
1. A direct current feeder protection system comprising:
- a first conductor;
a second conductor;
a third conductor;
a fourth conductor;
a fifth conductor;
a sixth conductor;
a first current sensor structured to sense first current flowing in the first conductor;
a second current sensor structured to sense second current flowing in the second conductor;
a third current sensor structured to sense third current flowing in the third conductor;
a fourth current sensor structured to sense fourth current flowing in the fourth conductor;
four circuit interrupters structured to interrupt currents flowing in the first, second, third and fourth conductors; and
a processor cooperating with said first, second, third and fourth current sensors to input said sensed first, second, third and fourth currents, respectively, and to output a number of commands to said four circuit interrupters, said processor comprising a routine structured to detect a number of;
a directional current fault of said sensed first, second, third or fourth currents, a differential current fault of said sensed first and third currents or said sensed second and fourth currents, and a residual current fault of said sensed first and second currents or said sensed third and fourth currents, and to responsively output said number of commands,wherein the first, fifth and third conductors are electrically connected in series with two of said four circuit interrupters, andwherein the second, sixth and fourth conductors are electrically connected in series with the other two of said four circuit interrupters.
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Accused Products
Abstract
A direct current feeder protection system includes six conductors, four current sensors sensing four currents flowing in four of the conductors, four circuit interrupters interrupting currents flowing in the four conductors, and a processor cooperating with the current sensors to input four sensed currents, and to output a number of commands to the circuit interrupters. The processor includes a routine detecting a number of: a directional current fault of the sensed currents, a differential current fault of the sensed first and third currents or the sensed second and fourth currents, and a residual current fault of the sensed first and second currents or the sensed third and fourth currents, and to responsively output the commands. The first, fifth and third conductors are electrically connected in series with two of the circuit interrupters, and the second, sixth and fourth conductors are electrically connected in series with the other circuit interrupters.
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Citations
21 Claims
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1. A direct current feeder protection system comprising:
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a first conductor; a second conductor; a third conductor; a fourth conductor; a fifth conductor; a sixth conductor; a first current sensor structured to sense first current flowing in the first conductor; a second current sensor structured to sense second current flowing in the second conductor; a third current sensor structured to sense third current flowing in the third conductor; a fourth current sensor structured to sense fourth current flowing in the fourth conductor; four circuit interrupters structured to interrupt currents flowing in the first, second, third and fourth conductors; and a processor cooperating with said first, second, third and fourth current sensors to input said sensed first, second, third and fourth currents, respectively, and to output a number of commands to said four circuit interrupters, said processor comprising a routine structured to detect a number of;
a directional current fault of said sensed first, second, third or fourth currents, a differential current fault of said sensed first and third currents or said sensed second and fourth currents, and a residual current fault of said sensed first and second currents or said sensed third and fourth currents, and to responsively output said number of commands,wherein the first, fifth and third conductors are electrically connected in series with two of said four circuit interrupters, and wherein the second, sixth and fourth conductors are electrically connected in series with the other two of said four circuit interrupters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A direct current feeder protection system for use with a combiner box and an inverter, said direct current feeder protection system comprising:
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a first conductor; a second conductor; a third conductor; a fourth conductor; a fifth conductor; a sixth conductor; a first current sensor structured to sense first current flowing in the first conductor from the combiner box; a second current sensor structured to sense second current flowing in the second conductor to the combiner box; a first two-pole circuit interrupter structured to interrupt currents flowing in the first and second conductors; a third current sensor structured to sense third current flowing in the third conductor to the inverter; a fourth current sensor structured to sense fourth current flowing in the fourth conductor from the inverter; a second two-pole circuit interrupter structured to interrupt currents flowing in the third and fourth conductors; and a processor cooperating with said first, second, third and fourth current sensors to input said sensed first, second, third and fourth currents, respectively, and to output a number of commands to said first and second two-pole circuit interrupters, said processor comprising a routine structured to detect a number of;
a directional current fault of said sensed first, second, third or fourth currents, a differential current fault of said sensed first and third currents or said sensed second and fourth currents, and a residual current fault of said sensed first and second currents or said sensed third and fourth currents, and to responsively output said number of commands,wherein the first, fifth and third conductors are electrically connected in series with a first pole of each of said first and second two-pole circuit interrupters, and wherein the second, sixth and fourth conductors are electrically connected in series with a second pole of each of said first and second two-pole circuit interrupters. - View Dependent Claims (20, 21)
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Specification