3.3
Plant layout
Inverter
with circuit-breaker
String combiner with
DC isolator switch
*
Switch box
Inverter
with circuit-breaker
AC
AC
String combiner with
DC isolator switch
RS485
PV generator
PV generator
Fig. 6: Circuit diagram with a short or long supply cable to the inverter
Grid connection point
P
Transf.
Inverter
with circuit-breaker
S
XFMR MV/LV
Equivalent mains
impedance up to 25%
Fig. 7: Circuit diagram from the grid connection point to the inverter
Legend
Definition / Information about the connection
PV generator
The PV generator converts the radiant energy of sunlight
into electrical energy.
String combiner
A string combiner can be coupled to the KACO device so
that the DC lines can be combined.
*) If the supply cable from the PV generator to the device is
long, the string combiner can also be installed in the vicinity
of the PV generator.
An integrated DC isolator switch enables disconnection on
the DC-side.
Switch box
A switch box with integrated DC isolator switch enables dis-
connection from the inverter on the DC-side.
Inverter with circuit-breaker
The PV generator is connected to the device's DC connec-
tion.
Transformer
All three phases need to be set up on the medium-voltage
transformer or medium-voltage/high-voltage transformer.
In this case, the total impedance of the transformer stations
must be below 25%.
Grid connection point
The clean PV-current is made available at the grid connec-
tion point.
KACO blueplanet 87.0 TL3 KACO blueplanet 92.0 TL3 KACO blueplanet 110 TL3 KACO blueplanet 125 TL3
KACO blueplanet 137 TL3 KACO blueplanet 150 TL3
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EN-US
