DIRECT CURRENT GROUND FAULT DETECTION DEVICE, METHOD FOR DETECTING GROUND FAULT OF DIRECT CURRENT CIRCUIT AND METHOD FOR SWITCHING DIRECT CURRENT POWER SOURCE

摘要

PROBLEM TO BE SOLVED: To detect ground fault in a plurality of direct current circuits and to switch direct current power sources uninterruptibly.

SOLUTION: A direct current ground fault detection device includes: a first terminal connected to one bus bar of a positive side bus bar and a negative side bus bar of a first direct current power source; a second terminal connected to the other bus bar of the positive side bus bar and the negative side bus bar of the first direct current power source; first and second voltage detection elements connected in series between the first terminal and the second terminal; a third terminal for connecting a connection point between the first voltage detection element and the second voltage detection element to the ground; a fourth terminal connected to one bus bar of a positive side bus bar and a negative side bus bar of a second direct current power source; a capacitor for capacitively coupling the first terminal and the fourth terminal; and a determination part for determining whether or not ground fault has occurred in the first direct current circuit including the first direct current power source or the second direct current circuit including the second direct current power source on the basis of at least one of the voltage detected by the first and second voltage detection elements and the current flowing between the connection point and the third terminal.

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