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Technical Description
14
Requirements for the Infrastructure
REFUsol 50K-3T
982081 | 03 | 2021-03
3.3 Requirements for the Infrastructure
The following points are to be considered when
planning the infrastructure:
∘
The
REFUsol 50K-3T
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 50K-3T
is not equipped with internal po
-
tential isolation.
∘
If connected with the medium-voltage-grid, it must
be operated with electrically isolating transform
-
ers.
∘
The transfomer must be selected according to the
specific site of use and the relevant regulations
must be taken into account: Hazardous substances
ordinance, ordinance on installations for handling
substances hazardous to water, chemicals prohibi
-
tion ordinance, technical instructions for noise pro
-
tection, and regional building regulations.
∘
The
REFUsol 50K-3T
has 3 independent MPP track
-
ers. All PV modules connected to the same MPPT
should be of the same type and have the same ori
-
entation.
∘
When planning the system, selecting operating
equipment, installation, commissioning and com
-
Additional required
equipment
at low voltage
network
at medium
voltage net
-
work
DC load break switch integrated
1)
1)
Local regulation might require an additional DC switch at a external DC
combiner box.
integrated
1)
AC load break switch necessary
necessary
Central grid protec
-
tion device with sec
-
tion switch
(VDE-AR-N 4105,
VDE-AR-N 4110)
necessary
necessary
LV-/MV-Transformer not necessary
necessary
Specification of medium voltage transformer
Mains transformer according to EN 50588-1
Switching group
Dyn5 or Dyn11