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Power supply
To be able to operate the relay needs a constant
module
supply of auxiliary energy. The power supply
module forms the voltages required by the
protection relay modules and the auxiliary relay
module. The module is located behind the
system front plate together with the output
relay module. The power supply module can
be withdrawn after removing the system front
plate .
The power supply module is a transformer
connected, i.e. galvanically isolated primary
and secondary side, flyback-type dc/dc
Fig. 6. Voltage levels of the power supply module.
A green LED indicator marked U
system front plate is illuminated when the
power supply module is in operation. The
supervision of the voltages supplying the
electronics is placed in the relay modules.
Should the secondary voltage deviate from its
rated value by more than 25 %, a self-
supervision alarm will follow. An alarm is also
received when the power supply module has
been removed from the relay case or when the
auxiliary power supply to the relay has been
interrupted.
There are two versions of power supply
modules available. The secondary sides of
1 A slow
Uaux
80...265 V ac & dc
18...80 V dc
converter. The primary side of the power supply
module is protected with a fuse, F1, located on
the PC-board of the module. The fuse size is
1 A (slow).
The power supply module forms the secondary
voltages required by the relay modules; i.e.
+24 V, ±12 V and +8 V. The output voltages
±12 V and +24 V are stabilized in the power
supply module, while the +5 V logic voltage
required by the relay modules is formed from
the +8 V by the stabilizers of the concerned
relay modules.
on the
both types have identical ratings, but the input
aux
voltage ranges vary.
Insulation test voltage between primary and
secondary side and the protective earth
2 kV, 50 Hz, 1 min.
Rated power P
Input voltage ranges of the auxiliary power
modules
- type SPGU 240A1
U
= 80...265 V dc or ac
aux
- type SPGU 48B2
U
= 18...80 V dc
aux
Unstabilized logics
+8V
voltage
+12V
Operation amplifier
voltage
-12V
Output relay coil
+24V
voltage
=15 W
n
B
9
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