Auto-Reclosing Operation Off And On; Start Auto-Reclosing And Conditions For Start Of A Reclosing Cycle - ABB RELION 650 Series Applications Manual

1MRK 505 363-UEN A
• 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-phase tripping" is then used to switch the tripping to three-phase. 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 Phase 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-phase 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
12.2.2.1

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
settings
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.
12.2.2.2

Start auto-reclosing and conditions for start 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 START. 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 Earth 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 STARTHS (Start High-Speed Reclosing). When initiating STARTHS,
the auto-reclosing open time for three-phase shot 1,
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:
Application manual
Operation = Off , or On sets the function OFF and ON. With the
Operation = On and ExternalCtrl = On , the control is made by input signal pulses to
t1 3PhHS is used and the closing is done
Section 12
Control
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