K Locating Insulation Resistance Faults
If the ground impedance of a PV string connected to the inverter is too low, the
inverter generates a Low insulation resistance alarm.
The possible causes are as follows:
● A short circuit has occurred between the PV array and the ground.
● The ambient air of the PV array is damp and the insulation between the PV
array and the ground is poor.
After the Low insulation resistance alarm is reported by the inverter, insulation
resistance fault location is automatically triggered. If the fault location is
successful, the location information is displayed on the Alarm details screen of
the Low insulation resistance alarm on the FusionSolar app.
Log in to the FusionSolar app, choose Alarm > Active alarm, select Low
insulation resistance to enter the Alarm details screen.
Figure K-1 Alarm details
SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual K Locating Insulation Resistance Faults
Issue 18 (2024-03-10) Copyright © Huawei Technologies Co., Ltd. 125
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