Control Of The Auto Reclosing Dead Time For Shot 1 - ABB REC670 Applications Manual

1MRK 511 401-UUS A
14.2.2.5
14.2.2.6
Bay control REC670 2.2 ANSI
Application manual
• Tripping from delayed distance protection zones
• Tripping from back-up protection functions
• Tripping from breaker failure function
• Intertrip received from remote end circuit breaker failure function
• Busbar protection tripping
Depending of the starting principle (general trip or only instantaneous trip) adopted
above the delayed and back-up zones might not be required. Breaker failure trip local
and remote must however always be connected.

Control of the auto reclosing dead time for shot 1

Up to four different time settings can be used for the first shot, and one extension time.
There are separate settings for single-, two- and three-phase auto reclosing dead time,
t1 1Ph, t1 2Ph, t1 3Ph. If no particular input signal is applied, and an auto reclosing
program with single-phase auto reclosing is selected, the auto reclosing dead time t1
1Ph will be used. If one of the TR2P or TR3P inputs is activated in connection with the
start, the auto reclosing dead time for two-phase or three-phase auto reclosing is used.
There is also a separate time setting facility for three-phase high-speed auto reclosing
without synchrocheck, t1 3PhHS, available for use when required. It is activated by the
RI_HS input.
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.
Long trip signal
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.
Section 14
Control
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