ABB REL650 Technical Manual page 370

Section 11
Control
364
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 and the PLCLOST input. The logic for control of extended dead time is shown in
Figure177 and Figure 181. Time extension delay is not possible to add to the three-
phase high-speed auto reclosing dead time, t1 3PhHS.
Extended t1
PLCLOST
AND
initiate
start
IEC16000155 V1 EN-US
Figure 177: Control of extended dead time
Shots 2 to 5 are all three-phase shots and have only one corresponding time setting
each, t2 3Ph, t3 3Ph, t4 3Ph and t5 3Ph.
Starting auto reclosing
When a start is applied to the auto function, it status will change from "ready"
status to "in progress" status. When the dead time has expired, the close command
is issued and the reclaim time is started and the "in progress" status will change to
"reclaim time" status.
The usual way to start a reclosing sequence, is to start it when a selective line
protection tripping has occurred, by applying a signal to the START input. If the
auto reclosing mode with only three-phase reclosing is selected, activation of the
START input will start the three-phase dead timer. When alternatively the START
input signal is applied, and an auto reclosing mode with single-phase reclosing is
selected, the auto reclosing dead time for single-phase is used. However if one of
the TR2P or TR3P inputs is activated in connection with the START input, the auto
reclosing dead time for two-phase or three-phase auto reclosing is used. The
STARTHS input (start high-speed reclosing) can also be used to start a separate,
high-speed three-phase dead time in which case the synchrocheck condition will be
bypassed.
To start a new auto reclosing cycle, a number of conditions of input signals need to
be fulfilled. The inputs are:
AND
OR
AND
IEC16000155-1-en.vsdx
Line distance protection REL650 2.2 IEC
1MRK 506 382-UEN A
extendTime
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Technical manual