ABB Relion 670 Series Applications Manual page 299

1MRK 511 401-UUS F
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
14.2.2.1 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
With the settings
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
operative if other conditions such as circuit breaker is closed and circuit breaker is ready are also
fulfilled, the
14.2.2.2 Initiate auto reclosing and conditions for start of a reclosing cycle
The usual way to start an auto reclosing cycle, or sequence, is to start it at selective tripping by
line protection by applying a signal to the
signals or, only the conditions for differential, distance protection zone 1 and distance protection
aided trip. In some cases also directional ground fault protection 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 an auto reclosing sequence.
In cases where one wants to differentiate three-phase auto reclosing dead time, for different
power system configuration or at tripping by different protection stages, one can also use the
RI_HS input (initiate high-speed reclosing). When initiating RI_HS , the auto reclosing dead time for
three-phase shot 1,
condition.
Bay control REC670
Application manual
Operation = Disabled , or Enabled sets the function to Off or On.
Operation = Enabled and ExternalCtrl = Enabled , the control is made by input
READY output is activated (high). Then the auto recloser is ready to accept a start.
t1 3PhHS is used and the closing is done without checking the synchrocheck
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SETON output is set, and the auto recloser becomes
RI input. Starting signals can be either, general trip
Section 14
Control
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