Figure 556: Simplified logic diagram of initiation lines
Each delayed initiation line has four different time settings:
Table 1005: Settings for delayed initiation lines
Setting name Description and purpose
Str x delay shot 1
Time delay for the DEL_INIT_x line, where
x is the number of the line 2, 3 or 4. Used for
shot 1.
Str x delay shot 2
Time delay for the DEL_INIT_x line, used
for shot 2.
Str x delay shot 3
Time delay for the DEL_INIT_x line, used
for shot 3.
Str x delay shot 4
Time delay for the DEL_INIT_x line, used
for shots 4 and 5. Optionally, can also be
used with SOTF.
9.4.6.5 Shot initiation from protection start signal
In it simplest, all auto-reclose shots are initiated by protection trips. As a result, all
trip times in the sequence are the same. This is why using protection trips may not
be the optimal solution. Using protection start signals instead of protection trips
for initiating shots shortens the trip times.
Example 1
When a two-shot-sequence is used, the start information from the
protection function is routed to the DEL_INIT 2 input and the operate
information to the INIT_2 input. The following conditions have to apply:
• protection operate time = 0.5s
•
Str 2 delay shot 1
= 0.05s
1MRS757644 H
Control functions
620 series
Technical Manual
1037
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