Manual 37259C
SPM-D11 - Synchronizing Unit
Page 12/79
© Woodward
Measuring Inputs
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Voltage
NOTE
The SPM-D11 can only operate (monitor) one synchronization point (one power circuit breaker), due to
the 1-power-circuit-breaker configuration. The measured voltage at terminals 23/24 is the voltage refer-
ence point for the synchronization at terminals 20/21. The synchronization reference voltage can be the
mains or busbar voltage.
NOTE
There are generally three variations for connection of the measuring circuit voltage:
c
Direct connection to a low voltage system
d
Connection to medium voltage via two-phase isolated transformer (e. g. in the case of a
delta connection)
e
Connection to medium voltage via single- phase isolated transformer (e. g. Y-connection).
The SPM-D11 may be connected to L1/L2 or L1/N. Regardless of what connection is used, the genera-
tor and mains/busbar must always be connected identically. Correct measured values can be achieved
for three-phase and single-phase systems if the SPM-D11 is configured accordingly (refer to CTs (Cur-
rent Transformer) on page 42).
Generator
Generator
voltage
0
20
21
G
L2
L1
1
2
3
MCB
L2
L1
L3
N
GCB
Figure 3-5: Measuring inputs - Generator
Note:
Connection corresponding to the mains configuration (see wiring diagram)
Terminal Measurement
Description
A
max
Connection of the measuring circuit voltage corresponding to the variant
c
,
d
or
e
20
Generator voltage L1
2.5 mm²
21
Generator voltage L2
2.5 mm²
0
direct or
Transformer
../100 V
Reference point: N-terminal of the low voltage system or
star point of the voltage transducer (measuring reference
point);
Æ
do not connect in delta connection installations
Solder.lug
