On the insulation resistance in high-power free-field grid-connected photovoltaic plants
In this paper, the authors discuss the crucial aspects of the insulation resistance testing of PV installations. This test verifies the integrity of wiring systems, and can be used to detect or prevent damages to wiring and ground faults. The insulation resistance test measures the resistance between ungrounded circuits and ground, under the application of high-voltage. Baseline insulation resistance can be compared to measurements over time to assess degradation of PV arrays or conductors.