Long Trip Signal; Maximum Number Of Reclosing Shots; Armode = 3Ph, (Normal Setting For A Single 3 Phase Shot); Armode = 1/2/3Ph - ABB REB670 Applications Manual

1MRK 505 337-UUS -
12.2.2.6
12.2.2.7
12.2.2.8
12.2.2.9
Application manual
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.
An auto-reclosing open time extension delay, tExtended t1, can be added to the normal
shot 1 delay. It is intended to come into use if the communication channel for permissive
line protection is lost. In such a case there can be a significant time difference in fault
clearance at the two ends of the line. A longer "auto-reclosing open time" can then be
useful. This extension time is controlled by setting parameter Extended t1=On and the
input PLCLOST. If this function is used the autorecloser start must also be allowed from
distance protection Zone 2 time delayed trip.

Long trip signal

In normal circumstances the trip command resets quickly because of fault clearance. The
user can set a maximum trip pulse duration tTrip.If Extended t1=Off, a long trip signal
interrupts the reclosing sequence in the same way as a signal to input INHIBIT. If Extend
t1=On the long trip time inhibit is disabled and Extend t1 is used instead.

Maximum number of reclosing shots

The maximum number of reclosing shots in an auto-reclosing cycle is selected by the
setting parameter NoOfShots. The type of reclosing used at the first reclosing shot is set by
parameter ARMode. The first alternative is three-phase reclosing. The other alternatives
include some single-phase or two-phase reclosing. Usually there is no two-pole tripping
arranged, and then there will be no two-phase reclosing.
The decision for single and 3 phase trip is also made in the tripping logic (SMPTTRC ,94)
function block where the setting 3Ph, 1/3Ph (or1/2/3Ph) is selected.

ARMode = 3ph, (normal setting for a single 3 phase shot)

3-phase reclosing, one to five shots according to setting NoOfShots. The output Prepare
three-pole trip PREP3P is always set (high). A trip operation is made as a three-pole trip
at all types of fault. The reclosing is as a three-phase 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.

ARMode = 1/2/3ph

1-phase, 2-phase or 3-phase reclosing first shot, followed by 3-phase reclosing shots, if
selected. Here, the auto-reclosing function is assumed to be "On" and "Ready". The
breaker is closed and the operation gear ready (operating energy stored). Input RI (or
RI_HS) is received and sealed-in. The output READY is reset (set to false). Output
ACTIVE is set.
Section 12
Control
307