3.3
System layout
KWh
KWh
PE
PV generator
PV generator
Inverter with
DC isolator switch* &)
circuit-breaker
Load
Reference counter
Feed-in meter
Grid connection point
Line protection
Line protection
Selective
main switch
Selective
main switch
Inverter with
DC isolator switch* &)
circuit-breaker
Requirement for
Transformer XFMR MV/LV
Fig. 5:
Circuit diagram of a system with two inverters
Key
Definition / information on the connection
PV generator
The PV generator converts the radiant energy of sunlight
into electrical energy.
Inverter with circuit-breaker
The PV generator is connected to the device's DC connec-
tion.
Line protection
The circuit breaker is an overcurrent protection device.
Feed-in meter
The feed-in meter is to be specified and installed by the
power supply company. Some power supply companies also
allow the installation of your own calibrated meters.
Selective main switch
The selective main switch is to be specified by the power
supply company.
Reference counter
The reference counter is to be specified and installed by the
power supply company. This measures the amount of en-
ergy drawn.
Transformer
NOTE:
The earthing is carried out in the outgoing
neutral point. (Dy5)
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.
DC isolator switch
Use the DC isolator switch to disconnect the device from
the PV generator.
Manual
Description of the device | 3
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