About How to find the DC grounding of photovoltaic panels
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 .
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 .
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.
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