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1
1.1
1.2
1.3
1.4
140
Autorecloser (AR)
Autorecloser (AR)
Application
The majority of power line faults are transient in nature, i.e. they do not recur when the line is
re-energized following disconnection. The main purpose of the AR automatic reclosing function
is to automatically return power lines to service following their disconnection for fault condi-
tions.
To meet the different single, double or 1 and 1/2 circuit breaker arrangements, one, two, three,
or six identical AR function blocks may be provided within a single terminal. The actual number
of these function blocks that may be included within any given terminal depends on the type of
terminal. Therefore, the specific circuit breaker arrangements that can be catered for, or the num-
ber of bays of a specific arrangement that can be catered for, depends on the type of terminal.
Functionality
The AR function is a logical function built up from logical elements. It operates in conjunction
with the trip output signals from the line protection functions, the OK to close output signals
from the synchrocheck and energizing check function, and binary input signals. The binary input
signals can be for circuit breaker position/status or from other external protection functions.
Function block
AR01-
AR
ON
BLOCKED
OFF
SETON
BLKON
INPROGR
BLKOFF
ACTIVE
INHIBIT
UNSUC
RESET
READY
START
CLOSECB
T1
STTHOL
T2
TRSOTF
CBREADY
T3
CBCLOSED
T4
PLCLOST
WFMASTER
SYNC
WAIT
xx00000220.vsd
Figure 71:
AR Function block: Three phase
Logic diagram
Chapter 9
Control
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