1MRS751802-MUM
REX 521
191
Protection Relay
Technical Reference Manual, Standard Configurations
10.3.2. Measurement connections
The three-phase current, neutral current transformers and residual voltage
transformer are connected to the connector X1.1 on the rear panel. The rated currents
of the measuring input are 1 A and 5 A and additionally, for earth fault, 0.2 A and 1
A. The rated values for voltage are 100 V, 110 V, 115 V and 120 V.
Fig. 10.3.2.-1 Connection diagram for the standard configuration M02
The technical data of the current transformers and the voltage transformer are set via
the Relay Setting Tool or the local HMI. The settings can be found in
Main menu\Configuration\Meas. devices\.
Refer to
REX 521 Technical Reference Manual, General (see Section 1.5. Related
documents) for further information about how to set the rated currents and voltage.
10.3.3. Protection
All the necessary settings for the protection functions can be set via the Relay
Setting Tool or the local HMI. The settings can be found in
Main menu\Protection\.
The overcurrent, the phase discontinuity and thermal overload protection can be
implemented in the same way as in the first application example (see Section 9.1.
Outgoing feeder, Basic B01) and the directional earth fault protection as in the fifth
application example (seec Section 10.1. Outgoing feeder, Medium M01).
10.3.3.1. Auto-reclosure function
The auto-reclose function (O->I) enables different types of auto-reclosing. An auto-
reclose sequence is initiated either by a start signal or by a trip signal.
5
REX 521
0,2
v
100V
Uo
b
da
dn
A
N
FiveCTM02
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