Plant Layout - Kaco blueplanet 92.0 TL3 US Manual

3 | Device description
3.3

Plant layout

PV generator
String combiner with
DC isolator switch
Fig. 6: Circuit diagram with a short or long supply cable to the inverter
P
PE
S
Fig. 7: Circuit diagram from the grid connection point to the inverter
Legend
PV generator
String combiner
Switch box
Inverter with circuit-breaker
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 ..."
Grid connection point
Page 14
PV generator
*
Grid connection point
P
S
PE
Definition / Information about the connection
The PV generator converts the radiant energy of sunlight
into electrical energy.
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.
A switch box with integrated DC isolator switch enables dis-
connection from the inverter on the DC-side.
The PV generator is connected to the device's DC connec-
tion.
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%.
The clean PV-current is made available at the grid connec-
tion point.
KACO blueplanet 92.0 TL3 US KACO blueplanet 110 TL3 US KACO blueplanet 125 TL3 US
Manual
String combiner with DC
isolator switch
RS485
Switch box
Transformer
XFMR MV/LV
Equivalent grid impedance up to
25%
Inverter
with circuit-breaker
Inverter
with circuit-breaker
AC
Inverter
with circuit-breaker
AC