Sunny Island 4500
Installation & Operating Instructions
BWRI45-13-EE0304
- 49 -
SMA Regelsysteme GmbH
3.4.5 Connection measure Generator / Mains Current and Voltage
If a generator (diesel, gas) is integrated into the island grid the diesel voltage must be
measured via the input “Generator / Mains sync. input” of the Sunny Island.
Most integrated generator-monitoring and -control features are not available until also
the generator current is fed to the Sunny Island via a current transformer. The meas-
urement is connected as shown in Fig. 3.8.
Sunny Island
L
N
k
k
L
L
X2:
1
2
3
4
N
L
+I
-I
1)
2)
G
L
N
PE
Generator /
Mains
Generator /
Mains
sync. input
current input
Fig. 3.8:
Connection of generator current and voltage measurement
1) Fuses for the protection of the generator voltage sensor cables, 2) Current transformer
Ensure sufficient fusing of the generator voltage sensor cables.
The cross-section of the cable leading from the current converter to
the inverter should be large enough to keep losses low (see also Fig.
3.9).
If the measuring circuit of the inverter is opened during operation
this can lead to overvoltages and destruction of the current con-
verter. The measuring circuit has therefore to be short-circuited at
the current converter.
