Auto-Reclosing Operation Disabled And Enabled - ABB REL650 Applications Manual

1MRK 506 334-UUS A
11.3.2.1
11.3.2.2
Application manual
• 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 autoreclose
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 trippingis 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 clear the fault.
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 Disabled and Enabled

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. In setting Operation=ExternalCtrl= Disabled and Enabled control is made by
input signal pulses, for example, from the control system or from the binary input (and
other systems).
When the function is set Enabled and operative (other conditions such as CB closed and
CB Ready are also fulfilled), the output SETON 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 tripping by line
protection by applying a signal to the input PICKUP. Starting signals can be either,
General Trip signals or, only the conditions for Differential, Distance protection Zone 1
Section 11
Control
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