ABB RED650, Applications Manual

Page: 241 / 454

A time extension delay, tExtended t1 , can be added to the dead time delay for the
first shot. It is intended to come into use if the communication channel for
permissive line protection is lost. In a case like this there can be a significant time
difference in fault clearance at the two line ends, where a longer auto reclosing
dead time can be useful. This time extension is controlled by the setting
Extended
t1 = On and the PLCLOST input. If this functionality is used the auto recloser start
must also be allowed from distance protection zone 2 time delayed trip. Time
extension delay is not possible to add to the three-phase high-speed auto reclosing
dead time,
t1 3PhHS .
12.2.2.6 Long trip signal
M12391-117 v4
In normal circumstances the auto recloser is started with a protection trip command
which resets quickly due to fault clearing. The user can set a maximum start pulse
duration
tLongStartInh . This start pulse duration time is controlled by setting
LongStartInhib .
When start pulse duration signal is longer than set maximum start pulse duration,
the auto reclosing sequence interrupts in the same way as for a signal to the
INHIBIT input.
12.2.2.7 Maximum number of reclosing shots
M12391-120 v7
The maximum number of auto reclosing shots in an auto reclosing cycle is selected
by the setting
NoOfShots . A maximum of five shots can be done. The type of auto
reclosing used at the first auto reclosing shot is set by the setting ARMode . The first
alternative is three-phase auto reclosing. The other alternatives include some
single-phase or two-phase auto reclosing. Usually there is no two-phase tripping
arranged, and then there will be no two-phase auto reclosing.
The decision for single- and three-phase trip is also made in the tripping logic
(SMPTTRC) function block where the setting
3 phase , 1ph/3Ph (or 1ph/2ph/3Ph )
is selected.
12.2.2.8
ARMode = 3ph, (normal setting for a three-phase shot)
M12391-124 v5
Three-phase auto reclosing, one to five shots according to the NoOfShots setting.
The prepare three-phase trip PREP3P output is always set (high). A trip operation
is made as a three-phase trip for all type of faults. The auto reclosing is as a three-
phase auto reclosing as in mode 1/2/3ph described below. All signals, blockings,
inhibits, timers, requirements and so on, are the same as in the example described
below.
12.2.2.9
ARMode = 1/2/3ph
M12391-127 v8
Single-phase, two-phase or three-phase auto reclosing first shot, followed by 3-
phase auto reclosing shots, if selected. Here, the auto recloser is assumed to be
"On" and "Ready". The circuit breaker is closed and the operation gear ready
1MRK 505 393-UEN B
Section 12
Control
Line differential protection RED650 2.2 IEC 235
Application manual