- 391 -
Note: In the FL, user should verify the direction between the FL function and the other
protection function. For example, if Forward is set for the scheme switch [FL-Dir],
user should set Forward for the respective scheme switches [Z*S-DIR], [Z*G-DIR]
and [OC*-DIR]. If contradiction is found, the FL does not operate. For further
information, see section 2.32.6(iii).
Trigger signal for FL calculation
Figure 2.32-6 shows trigger signals for FL calculation. Result signals
1
from the respective
protection functions are summarized by logic “OR”, which provides the trigger signal.
Result signal of ZS function
Result signal of ZG function
Result signal of OC function
Result signal of DIF function
Trigger signal
for calculation
Trigger signal
for calculation
Figure 2.32-6 Calculation trigger from functions and PLC
1
Note: The result signals can start the FL calculation, but the result signals are not the same as the
operation signals of
Figure 2.32-5.
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