Measurement Connections; Protection; 1.Auto-Reclosure Function - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
10.3.2.
10.3.3.
10.3.3.1.
160
Protection Relay
Technical Reference Manual, Standard Configurations

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. The
rated values for voltage are 100 V, 110 V, 115 V and 120 V.
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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\.
Please refer to Technical Reference Manual, General (1MRS 751108-MUM) for
further information about how to set the rated currents and voltage.

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 (chapter 9.1.) and
the directional earth-fault protection as in the fifth application example
(chapter ).
Auto-reclosure function
The auto-reclose function (0->1) enables different types of auto-reclosing. An auto-
reclose sequence is initiated either by a start signal or by a trip signal.
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REX 521