Dead Time For Operating Modes With Tripping - Siemens 7SJ82 Manual

Figure 6-305 shows the tripping stage release for the 1st automatic reclosing cycle. With available automatic
reclosing functions, the tripping stage release typically occurs up to the expiration of the dead time. The cycle
number in this state is on 1. However, if the automatic reclosing cycle is set only for 1-phase
stage release will be reset to the beginning of the 1-phase dead time. This is necessary, since every additional
evolving fault that occurs within the dead time causes a 3-pole cut-off, and subsequently, the automatic
reclosing function can no longer take place.
[lo1awezk-170912-01.tif, 1, en_US]
Figure 6-305
The tripping stage release for higher automatic reclosing cycles is set to the beginning of the reclaim time for
rising edge close commands. Simultaneously, the cycle number is increased. The reset condition is identical to
the condition for the 1st automatic reclosing cycle. If the reduced dead time (RDT) mode is selected and no
additional reduced dead time occurs, the release of the 2nd cycle will be maintained, since it can be assumed
that the opposite end is open.
[lo2awezk-170912-01.tif, 1, en_US]
Figure 6-306
6.45.4.11

Dead Time for Operating Modes With Tripping

In the Dead time function block, that dead time which corresponds with the previous trip command is started.
After expiration of the dead time, the automatic reclosing function changes to the status Switch on.
Figure 6-307 shows the dead time logic.
There are the following time stages that can be set differently:
•
Dead time after 3-pole tripping
•
Dead time after evolving fault
Setting the parameter Dead time aft. 3-pole trip to ∞ (= invalid) avoids an automatic reclosing
after 3-pole tripping.
32 not for devices with only 3-phase tripping
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Stage Release for Protection Functions in the 1st Automatic Reclosing Cycle
Stage Release for Protection Functions Starting With the 2nd Automatic Reclosing Cycle
Protection and Automation Functions
6.45 Automatic Reclosing Function
32 , the tripping
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