GROUND FAULT DETECTION DEVICE, GROUND FAULT DETECTION METHOD, SOLAR ENERGY SYSTEM, AND GROUND FAULT DETECTION PROGRAM

摘要

A first predetermined point O1 of a photovoltaic circuit 110 insulated with respect to a ground G is grounded to the ground G by a first electrical ground path 21 A, a first direct current voltage value V1 is applied to the first measurement point O1 by a first direct current power supply 23A, and a first current value I1 flowing in the first electrical ground path 21 A is measured in this state. Further, a second predetermined point 02 of the photovoltaic circuit 110 insulated with respect to the ground G is grounded to the ground G by a second electrical ground path 21B, a second direct current voltage value V 2 different from the first direct current voltage value V 1 is applied to the second predetermined point 02 by a second direct current power supply 23B, and a second current value I 2 flowing in the second electrical ground path 21B is measured in this state. Also, a ground fault is detected based on the first and second measured current values I 1 and I 2 .