Auto-Reclosing Operation Off And On; Initiate Auto-Reclosing And Conditions For Initiation Of A Reclosing Cycle - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
be the master and be connected to inhibit the other auto-recloser if it has started. This inhibit can
for example be done from Autorecloser for 3-phase operation(SMBRREC ,79) In progress.
When Single and/or three phase auto-reclosing is considered, there are a number of cases where
the tripping shall be three phase anyway. For example:
• Evolving fault where the fault during the dead-time spreads to another phase. The other two
phases must then be tripped and a three phase dead-time and auto-reclose initiated
• Permanent fault
• Fault during three phase dead-time
• Auto-reclose out of service or CB not ready for an auto-reclosing cycle
"Prepare three-pole tripping" is then used to switch the tripping to three-pole. This signal is
generated by the auto-recloser and connected to the trip function block and also connected
outside the IED through IO when a common auto-recloser is provided for two sub-systems. An
alternative signal "Prepare 1 Pole tripping" is also provided and can be 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
13.2.2.1

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
the settings
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.
13.2.2.2

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
Application manual
Operation = Disabled , or Enabled sets the function OFF and ON. With
Operation = Enabled and ExternalCtrl = Enabled , the control is made by input signal
Section 13
Control
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