About How to measure the grounding resistance of photovoltaic bracket
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:.
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:.
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. This will identify which string has the ground fault.
By using emazys PV test equipment, which is based on gentle impedance measurement, ground faults at almost any level of isolation resistance may quickly be located. The test requires very little system understanding, and may be carried out as soon as the instrument operator is familiar with the basic concerns of PV testing.
The exact procedure is described in the following sections. Check the PV system for ground faults by measuring the voltage. If the voltage measurement was not successful, check the PV system via insulation resistance measurement for ground faults.
Using a digital multimeter (DMM), technicians should measure voltage from positive to negative, positive to ground, and negative to ground. The readings will return different values, which the technician can use in conjunction with the open-circuit voltage of each module to locate the ground fault.
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