2062

Low Insulation Resistance

Major

1

1. A short circuit has occurred between the PV array and the ground.
2. The ambient air of the PV array is damp and the insulation between the PV array and the ground is poor.

2

1. The battery rack is short-circuited to the ground.
2. The battery rack is in a humid environment and the insulation between the circuit and ground is poor.

1

1. Set Insulation resistance protection to the minimum value and restart the inverter.
2. Check that the PE cable of the device is correctly connected.
3. Check the output-to-ground impedance of the PV array. If a short circuit or inadequate insulation is detected, rectify it.

2

Send a shutdown command to devices connected to the same DC bus. Start insulation impedance detection for the battery rack to locate the fault. After the fault is located, perform the following operations:

1. Check the battery rack-to-ground impedance. If a short circuit or inadequate insulation is found, rectify it.
2. Check that the PE cable of the device is correctly connected.
3. If the impedance is lower than the specified protection threshold in rainy and cloudy days, change the Insulation resistance protection threshold setting.