149
EN
Direct method - Ground conductor current measured using ammeter on the ground con-
ductor
The sum of the currents flowing to the ground conductor through the device insulation or
caused by the circuits in the device is displayed.
1 Measuring device
2 Inverter
8 Isolated setup of test piece
9 Measuring line
Examples of measuring the ground conductor current
Differential current method - Ground conductor current measured using an ammeter on
the N and L conductors
As with an FI switch, the currents between the outer conductor (L) and the neutral conduc-
tor (N) are compared using a converter. The difference is displayed.
1 Measuring device
2 Inverter
9 Measuring line
Examples of measuring the ground conductor current
NOTE! The inverter leakage current for the Fronius Primo can be as high as 5 mA
due to the topology:
- The Fronius Primo is a transformerless inverter. The leakage current meas-
urement also includes leakage currents unintentionally measured through
the solar modules.
- To determine the maximum leakage current of the Fronius Primo, the leak-
age currents of the solar modules must be calculated and deducted from the
measured value.
(For instructions on how to calculate the leakage current of the solar mod-
ules, see DOCUMENT Transformerless calculation).
PE
mA
L1
1
2
999
N
PE L1 N
8
PE L1
1
2
999
N
PE L1 N
mA
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