How to measure the pv grounding of photovoltaic inverter
Disconnect the DC switch of each PV string connected to the inverter, and use a multi-meter to measure the voltage of the PV+ to ground and PV- to ground of each string.
Disconnect the DC switch of each PV string connected to the inverter, and use a multi-meter to measure the voltage of the PV+ to ground and PV- to ground of each string.
To determine the source of a ground fault:Ensure the inverter is isolated from the array by removing the positive and negative conductors;Close the DC disconnect to put a live voltage on the conductors;Measure the voltage between the positive and negative conductors to determine the open circuit voltage of the array; andMeasure positive to ground and negative to ground.
How to test energized DC PV string circuits with ground faultsUnderstand expected values before you begin Before testing to identify the location of a ground fault, you need to know what measurement values to expect — specifically voltage. De-energize and lockout/tagout (LOTO) where you're working . Inspect the PV array visually . Test for current on each string first, then open fuse holders . Test PV string voltage .
Connect the positive and negative output connectors of a PV string to a branch cable, and use an insulation resistance tester to test the insulation resistance of the PV string cable to the ground:.
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