167Maintenance
EN
8.13 Verification of ground leakage
In the presence of anomalies or report of ground fault (where provided), there may be a ground leakage
from the PV generator (DC side).
To check this, measure the voltage between the positive pole and ground and between the negative pole
(of the PV generator) and ground using a voltmeter whose input accepts a voltage sufficient for the
dimensions of the photovoltaic generator.
8.13.1 Behaviour of a system without leakage
Due to the capacitive effect of the PV generator, during the first moments that the voltmeter is connected
between one of the two poles and ground, it will measure a voltage of about Voc/2, which will tend to
stabilize to around 0V if there is no ground leakage, as shown in the graph below:
Voc
V
t
+Vs
-Vs
NOTE – D The internal resistance of the voltmeter tends to zero the voltage present on the PV
generator due to the capacitive effect.
How to make the measurement:
Volt
(+)
(-)
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