E Locating Insulation Resistance Faults - Huawei SUN2000-2KTL-L1 User Manual

SUN2000-(2KTL-5KTL)-L1
User Manual
E
If the ground resistance of a PV string connected to a solar inverter is too low, the solar
inverter generates a Low Insulation Resistance alarm.
The possible causes are as follows:
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To locate the fault, connect each PV strings to a solar inverter, power on and check the solar
inverter, and locate the fault based on the alarm information reported by the FusionSolar app.
If a system is not configured with any optimizer, skip the corresponding operations. Perform
the following steps to locate an insulation resistance fault:
Step 1 Power off a solar inverter. For details, see
Step 2 Connect each PV string to the solar inverter and power on the solar inverter. For details, see
6.2 System
Step 3 Log in to the FusionSolar app and choose My > Device Commissioning. On the Device
Commissioning screen, connect and log in to the solar inverter, and access the Alarm
management screen. Check whether the Low Insulation Resistance alarm is reported.
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Issue 01 (2020-04-17)
Locating Insulation Resistance Faults
A short circuit occurs 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.
Power-On.
If the Low Insulation Resistance alarm is not reported one minute after the solar
inverter is powered on, go to
a check.
If a Low Insulation Resistance alarm is still reported one minute after the solar inverter
is powered on, check the percentage for possible short-circuit positions on the Alarm
details page and go to
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8.1 System
Step 2 to connect another PV string to the solar inverter for
Step 4.

E Locating Insulation Resistance Faults

Power-Off.
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