5.6 AUTORECLOSE MODES
The device can provide Single-phase and/or Three-phase Autoreclose. The Autoreclose mode is configured by the
AR Mode setting in the AUTORECLOSE column. You can choose from:
● Single-phase (AR 1P)
● Three-phase (AR 3P)
● Single-phase and Three-phase (AR 1/3P)
● Controlled by commands from DDB signals that must be mapped to opto-isolated inputs in the PSL (AR
Opto).
Single-phase Autoreclosing is permitted only for the first shot of an Autoreclose cycle. In a multi-shot Autoreclose
cycle the second and subsequent trips will always be three-phase.
For multi-phase faults, you can use the Multi Phase AR setting in the AUTORECLOSE column to configure the
following options:
● Allow Autoreclose for all fault types (Allow Autoclose)
● Block Autoreclose for 2-phase and 3-phase faults (BAR 2 and 3 ph)
● Block Autoreclose for 3-phase faults (BAR 3 Phase)
5.6.1
SINGLE-PHASE AND THREE-PHASE AUTORECLOSE
This section applies to dual-CB devices. Where there are signals and settings for each of the two circuit breakers,
only the first CB (CB1) is shown, to improve clarity and save repetition. Where settings and signals include "CB1",
there is a "CB2" equivalent.
Single-phase Autoreclose Only
If single-phase Autoreclose is enabled, the logic allows only a single shot Autoreclose. For a single-phase fault, the
single phase dead timer SP AR Dead Time starts, and the DDB signal CB1 AR 1p Inprog is asserted, which indicates
that single-phase Autoreclose is in progress. In this case, for a multi-phase fault the logic triggers a three-phase
trip and goes to lockout.
Three-phase Autoreclose Only
During three-phase Autoreclose, for any fault, the three-phase dead timers: 3P AR DT Shot 1, 3P AR DT Shot 2, 3P
AR DT Shot 3 and 3P AR DT Shot 4 are started and the DDB signal is CB1 AR 3p InProg is asserted, which indicates
that three-phase Autoreclose is in progress.
If three-phase only Autoreclose is enabled, the logic forces a three-phase trip by setting the DDB signal AR Force
CB1 3P for any single-phase fault.
Single-phase and Three-phase Autoreclose
With single-phase and three-phase Autoreclose enabled then, if the first fault is a single-phase fault the single-
phase dead time SP AR Dead Time is started and the single-phase Autoreclose in progress signal is asserted. If the
first fault is a multi-phase fault the three phase dead timer 3P AR DT Shot 1 is started and the three-phase
Autoreclose in progress signal is asserted. If set to allow more than one reclose (AR Shots > 1) then any subsequent
faults are converted to three-phase trips by setting the force three-pole tripping signal. The three-phase dead
times 3P AR DT Shot 2, 3P AR DT Shot 3 and 3P AR DT Shot 4 (Dead Times 2, 3, 4) are started for the 2nd, 3rd and
4th trips (shots) respectively. The DDB signal CB1 AR 3p InProg is asserted. If a single-phase fault evolves to a
multi-phase fault during the single-phase dead time (SP AR Dead Time), single-phase Autoreclose is stopped. The
single-phase Autoreclose in progress signal is reset, the three-phase Autoreclose in progress signal is set, and the
three-phase dead timer 3P AR DT Shot 1 is started.
P446SV Chapter 11 - Autoreclose
P446SV-TM-EN-1 295
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