Auto-Reclosing Operation Off And On; Initiate Auto-Reclosing And Conditions For Initiation Of A Reclosing Cycle - ABB REB670 Applications Manual

1MRK 505 337-UUS -
12.2.2.1
12.2.2.2
Application manual
used as an alternative when the autorecloser is shared with another subsystem. This
provides a fail safe connection so that even a failure in the IED with the auto-recloser will
mean that the other sub-system will start a three-pole trip.
A permanent fault will cause the line protection to trip again when it recloses in an attempt
to energize the line.
The auto-reclosing function allows a number of parameters to be adjusted.
Examples:
• number of auto-reclosing shots
• auto-reclosing program
• auto-reclosing open times (dead time) for each shot

Auto-reclosing operation OFF and ON

Operation of the automatic reclosing can be set OFF and ON by a setting parameter and
by external control. Parameter Operation= Disabled, or Enabled sets the function OFF
and ON. With the settings Operation = Enabled and ExternalCtrl = Enabled , the control
is made by input signal pulses to the inputs ON and OFF, for example, from the control
system or from the binary input (and other systems).
When the function is set ON, the output SETON is set, and it become operative if other
conditions such as CB closed and CB Ready are also fulfilled, the output READY is
activated (high). When the function is ready to accept a reclosing start.

Initiate auto-reclosing and conditions for initiation of a reclosing cycle

The usual way to start a reclosing cycle, or sequence, is to start it at selective tripping by
line protection by applying a signal to the input RI. Starting signals can be either, General
Trip signals or, only the conditions for Differential, Distance protection Zone 1 and
Distance protection Aided trip. In some cases also Directional Ground fault function
Aided trip can be connected to start an Auto-Reclose attempt. If general trip is used to start
the auto- recloser it is important to block it from other functions that should not start a
reclosing sequence.
In cases where one wants to differentiate three-phase "auto-reclosing open time", ("dead
time") for different power system configuration or at tripping by different protection
stages, one can also use the input RI_HS (Initiate High-Speed Reclosing). When initiating
RI_HS, the auto-reclosing open time for three-phase shot 1, t1 3PhHS is used and the
closing is done without checking the synchrocheck condition.
A number of conditions need to be fulfilled for the start to be accepted and a new auto-
reclosing cycle to be started. They are linked to dedicated inputs. The inputs are:
Section 12
Control
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