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When a malfunction occurs, feeding is
immediately interrupted and the solar
inverter disconnects from the grid by
triggering the grid relay.
The potential-free alarm relay is switched
(except for grid undervoltage L1).
In addition, the following protective
equipment in accordance with overvolt
-
age category III is provided on the grid
and on the solar generator side:
· Grid-side varistors
These protect the power semiconduc
-
tors in case of high-energy, short-term
voltage peaks in the grid and provide
for an energy reduction in reactor in
case of a grid disconnection.
· Generator-side varistors
Varistors offer protection against at
-
mospheric overvoltages (e.g. caused by
remote strikes during thunderstorms).
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