Auto Reclosing Operation Off And On - ABB REC670 Applications Manual

1MRK 511 401-UUS A
14.2.2.1
Bay control REC670 2.2 ANSI
Application manual
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 recloser out of service or circuit breaker 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 dead times for each shot

Auto reclosing operation Off and On

Operation of the automatic recloser can be set to Off and On by a setting parameter or
by external control. The setting parameter Operation = Disabled, or Enabled sets the
function to Off or 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 a control system or by a control switch.
When the auto recloser is set On, the SETON output is set, and the auto recloser
becomes operative if other conditions such as circuit breaker is closed and circuit
breaker is ready are also fulfilled, the READY output is activated (high). Then the auto
recloser is ready to accept a start.
Section 14
Control
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