phase reclosing is selected, the auto-reclosing open time
t1 1Ph
will be used. If one of the
inputs TR2P or TR3P is activated in connection with the start, the auto-reclosing open time for
two-phase or three-phase 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 STARTHS 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=O
n and the input PLCLOST. If this
function is used the autorecloser start must also be allowed from distance protection Zone 2
time delayed trip.
13.2.2.6 Long trip signal
M12391-117 v3
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.
13.2.2.7 Maximum number of reclosing shots
M12391-120 v6
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-phase 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) function
block where the setting
3Ph, 1/3Ph (or1/2/3Ph)
is selected.
13.2.2.8
ARMode
=
3ph,
(normal setting for a single 3 phase shot)
M12391-124 v4
3-phase reclosing, one to five shots according to setting
NoOfShots
. The output Prepare
three-phase trip PREP3P is always set (high). A trip operation is made as a three-phase 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.
13.2.2.9
ARMode
=
1/2/3ph
M12391-127 v7
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 START (or STARTHS) is
received and sealed-in. The output READY is reset (set to false). Output ACTIVE is set.
• If inputs TR2P is low and TR3P is low (1-phase trip): The timer for 1-phase reclosing open
time is started and the output 1PT1 (1-phase reclosing in progress) is activated. It can be
used to suppress pole disagreement and earth-fault protection trip during the 1-phase
open interval.
• If TR2P is high and TR3P is low (2-phase trip): The timer for 2-phase reclosing open time is
started and the output 2PT1 (2-phase reclosing in progress) is activated.
• If TR3P is high (3-phase trip): The timer for 3-phase auto-reclosing open time,
t1 3Ph
is
started and output 3PT1 (3-phase auto-reclosing shot 1 in progress) is set.
• If STARTHS is high (3-phase trip): The timer for 3-phase auto-reclosing open time, t1
3PhHS is started and output 3PT1 (3-phase auto-reclosing shot 1 in progress) is set.
1MRK 511 358-UEN A Section 13
Control
243
Application manual
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