Grid connection point
P
Transformer
Inverter
with circuit-breaker
S
XFMR MV/LV
Equivalent grid impedance up to 25%
PE
PE
P
S
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.
Trafo
NOTE: The earthing is carried out in the outgoing
neutral point.(Dy5) – for more information see
Downloads - Application note "Grid Type and im-
pendance requirements …"
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.
Manual
Device description | 3
KACO blueplanet 110 TL3 KACO blueplanet 125 TL3
Page 11
EN-US
