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Automatic reclosing function (AR)
IOM
INPUT
xx
xx
xx
xx
xx
xx
xx
xx
xx
xx
PROTECTION
>1
xxxx-TRIP
OVLD-TRIP
SOTF-TRIP
>1
ZM1--TRIP
SYRW-AUTO
)LJXUH 5HFRPPHQGDWLRQV IRU ,2VLJQDO FRQQHFWLRQV
6HWWLQJV
Number of reclosing attempts: 1 to 4 attempts can be chosen. In most cases 1 attempt is
sufficient as the majority of arcing faults will cease after the first reclosing shot. In pow-
er systems with many faults caused by other phenomena than lightning, for example
wind, it can be motivated with more than one reclosing attempt.
If a permissive channel is used between the line ends, and the availability of the com-
munication channel is considered to be low, extended dead time in case of loss of the
channel should be used.
Typical required dead time for three pole trip and reclosing is 400 ms. Different local
phenomena, such as moisture, salt, pollution, etc. can influence the required dead time.
The open time for the first auto-reclosing shot can be set three pole (t1).
AR01-
ON
BLOCKED
OFF
SETON
BLKON
INPROGR
BLOCKOFF
ACTIVE
INHIBIT
UNSUC
CBREADY
CBCLOSED
PLCLOST
CLOSECB
RESET
READY
START
STTHOL
TRSOTF
SYNC
WAIT
WFMASTER
IOM
OUTPUT
xx
xx
xx
xx
xx
xx
xx
xx
xx
xx
T1
T2
T3
T4
en02000573.vsd
&KDSWHU
&RQWURO
179
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