2.Digital Input To Initiate Auto-Reclosing Function; 3.Basic Angle Control By Digital Input - ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS 751802-MUM
10.3.6.2.
10.3.6.3.
Protection Relay
Technical Reference Manual, Standard Configurations
Digital input to initiate auto-reclosing function
If an external start or trip signal is available for initializing the auto-recloser, the
signal can be connected to a digital input of the relay. Set the digital input, in this
example DI7, for the "0->1 Ext. start" or "0->1 Ext. trip" in
Main menu\Configuration\Input signals\. Further, in
Main menu\Configuration\Input SWGRP\ the external initiation signal
is named as "0->1 External". The initiation method is chosen and in this example
Trip AR1 or Start AR1 can be used depending on the signal available and the
methods parametrized within the auto-recloser function.
The rest of the settings are made in the settings for the auto-recloser in the same way
as mentioned above.
Basic angle control by digital input
If an external control signal determined from the earthing situation of the network is
available, it can be used for changing the settings for the basic angle of the
directional earth-fault protection. The angle can be switched in between 0° and –90°.
The usage of basic angle control is useful when compensated network is set to 0°
and an isolated network is set to -90°.
In this example, the digital input DI8 is connected to the input signal BACTRL and
then routed to the BACTRL input of the directional earth-fault functions. The
BACTRL signal can be found in Main menu\Configuration\Input
Signals\BACTRL\ where the DI8 is selected. The checksum for the switchgroup
in Main menu\Configuration\Input SWGRP\BACTRL\ should be 3 in
order to change the angle on Io>-> and Io>>->. Please refer to the CD-ROM
Technical Descriptions of Functions (1MRS 750889-MCD) for more information
about the basic angle control.
REX 521
165