ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS751802-MUM
REX 521
175
Protection Relay
Technical Reference Manual, Standard Configurations
10.1.2. 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. 10.1.2.-1 Connection diagram for the standard configuration M01
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.
10.1.3. 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 following protection functions can be implemented in the same way as in the
first application example (see Section 9.1. Outgoing feeder, Basic B01).
• Overcurrent protection
• Phase discontinuity protection
• Thermal overload protection
5
REX 521
0,2
v
100V
Uo
b
da
dn
A
N
FiveCT

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English