REFU REFUsol 100K - 3.8 Requirements for the Infrastructure

Technical Description 15
Requirements for the Infrastructure
REFUsol 100K
982059/02
2020-11
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Fig. 13: Grid-connected PV system with photovoltaic inverter
3.8 Requirements for the Infrastructure
The following points are to be considered when
planning the infrastructure:
∘ The REFUsol 100K can feed into the low-voltage grid
and the medium-voltage grid.
∘ The power supply line must be equipped with an ap-
propriate AC disconnecting device.
∘ The REFUsol 100K is not equipped with internal po-
tential isolation.
∘ If connected with the medium-voltage-grid, it must
be operated with electrically isolating transfor-
mers.
∘ The transfomer must be selected according to the
specific site of use and the relevant regulations
must be taken into account: Hazardous substances
1 Photovoltaik (PV) modules
2 Solar string combiner box
3 Photovoltaic inverter
4 AC protection (fuse switch disconnector or circuit breaker)
5 Grid protection
6 Isolation transformer is required for medium-voltage grid
7 Low or medium-voltage AC grid
Additional required
equipment
at low voltage
network
at medium vol-
tage network
DC load break switch
integrated
1)
integrated
1)
AC load break switch necessary necessary
Central grid protecti-
on device with section
switch
(VDE-AR-N 4105,
VDE-AR-N 4110)
necessary necessary
LV-/MV-Transformer not necessary necessary
1)
Local regulation might require an additional DC switch at a external DC
combiner box.