CHAPTER 6: SETPOINTS S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–139
Autorecloser (79)
The automatic recloser is intended for use on single three-pole tripping breaker
applications. Up to four reclosing “shots” can be programmed with independent set of
protection elements for initiation, and individual dead time prior to each subsequent shot.
A typical example for selection of individual set of overcurrent protection elements for
initiation is the selection of instantaneous overcurrent protections for the first AR initiation,
and selection of time overcurrent protections after the first reclose. This would provide
longer time before the breaker opens, and allow the fuses to burn off, if the fault is still
present.
NOTE:
To synchronize the Reclose function with the breaker status feedback, it is recommended
that a debounce of 2 cycles is used, regardless of whether the breaker status is detected
using one or both contacts.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH: SETPOINTS > S4 CONTROLS > AUTORECLOSE > AR SETUP
AR FUNCTION
Range: Disabled, Enabled
Default: Disabled
For details see Common setpoints
.
NUMBER OF SHOTS
Range: 1 to 4, step 1
Default: 1
The maximum number of reclosures that will be attempted before AR Not Ready.
DEAD TIME SHOT 1 to 4
Range: 0.1 to 600.0 s, step 0.1 s
Default: 1.0 s
This setting specifies the dead time delay before each reclosure. Four time delay
settings are to be configured and used to time out before the first, second, third, or
fourth breaker reclosure.
RST N/READY TIME
Range: 0.1 to 600.0 s, step 0.1 s
Default: 10 s
This setting specifies the reset AR Not Ready time. Upon breaker close, the timer times
out, and resets the AR lockout.
INCOMP SEQ TIME
Range: 0.1 to 600.0 s, step 0.1 s
Default: 5.0 s
This timer is used to set the maximum time interval allowed for single reclosure shot. The
timer starts timing out for both situations: upon AR initiate to open the breaker, where
the breaker doesn’t open, or whenever breaker reclose command is issued, where the
breaker doesn’t close. Upon incomplete sequence time expiry, the AR goes into AR Not
Ready mode.
RESET TIME
Range: 0.1 to 600.0 s, step 0.1 s
Default: 5.0 s
This time is used to reset the AR into AR ready mode after successful reclosure. If no
breaker tripping occurs within the reset time, the AR shot counter is reset.
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