2.10 Automatic Reclosure Function (optional)
141
7SD610 Manual
C53000-G1176-C145-4
For the functions which are to start the auto-reclosure function, the corresponding
address is set to YES, for the others to NO. The other functions cannot start the auto-
matic reclosure because reclosure is of little use here.
Forced three-pole
trip
If a blocking of the auto-reclosure occurs during the dead time of a 1-pole cycle without
a previous 3-pole trip command, the breaker remains open at one pole. With address
3430 AR TRIP 3pole it is possible to determine that the tripping logic of the device
issues a three-pole trip command in this case (pole discrepancy prevention for the CB
poles). Set this address to YES if the CB can be tripped single-pole and if it has no pole
discrepancy protection. Nevertheless, the device pre-empts the pole discrepancy su-
pervision of the CB because the forced three-pole trip of the device is immediately ini-
tiated as soon as the reclosure is blocked following a single-pole trip or if the CB aux-
iliary contacts report an implausible breaker state (see also Section 2.10 at margin
heading „Processing the circuit breaker auxiliary contacts“). The forced three-pole trip
is also activated when only three-pole cycles are allowed, but a single-pole trip is sig-
nalled externally via a binary input.
The forced three-pole trip is unnecessary if only a common three-pole control of the
CB is possible.
Dead line check /
reduced dead time
Under address 3431 the dead line check can be switched active. It presupposes that
voltage transformers are installed on the line side of the feeder and connected to the
device. If this is not the case or the function is not used, set DLC / RDT = WITHOUT.
DLC / RDT = DLC means that the dead line check of the line voltage is used. This
only enables reclosure after it becomes apparent that the line is dead. In this case, the
phase-earth voltage limit is set in address 3441 U-dead< below which the line is con-
sidered voltage-free (disconnected). The setting is applied in Volts secondary. This
value can be entered as a primary value when parameterising with a PC and DIGSI.
Address 3438 T U-stable determines the measuring time available for determining
the no-voltage condition. Address 3440 is irrelevant here.
Adaptive dead time
(ADT)
When operating with adaptive dead time, it must be ensured in advance that one end
per line operates with defined dead times and has an infeed. The other (or the others
in multi-branch lines) may operate with adaptive dead time. It is essential that the
voltage transformers are located on the line side of the circuit breaker. Details about
this function can be found in Section 2.10 at margin heading „Adaptive Dead Time
(ADT) and Close Command-transfer (Remote-CLOSE)“.
For the line end with defined dead times the number of desired reclose cycles must be
set during the configuration of the protective functions (Section 2.1.1) in address 133
Auto Reclose. Additionally, the intertrip command of the differential protection
should be activated (see Section 2.4, address 1301 I-TRIP SEND = YES). For the
devices operating with adaptive dead time, address 133 Auto Reclose must have
been set to ADT during the configuration of the protective functions (Section 2.1.1).
Only the parameters described below are interrogated in the latter case. No settings
are then made for the individual reclosure cycles.
Address 3420 AR WITH DIFF, i.e. with differential protection
Address 3421 AR w/ SOTF-O/C, i.e. with high-current switch-onto-fault function
Address 3423 AR WITH I.TRIP, i.e. with permissive underreach transfer trip
(PUTT)
Address 3424 AR w/ DTT, i.e. with direct transfer trip
Address 3425 AR w/ BackUpO/C, i.e. with time overcurrent protection
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