Instruction manual
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AQ F3x0 Feeder protection IED
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Figure 3-1 Operation logic of the trip logic function.
The trip requirements can be programmed by the user. The aim of the decision logic is to
define a minimal impulse duration even if the protection functions detect a very short-time
fault.
3.3.2.1
Application example
Figure 3-2 Example picture where two I> TOC51 and I0> TOC51N trip signals are
connected to two trip logic function blocks.
In this example we have a transformer protection supervising phase and residual currents
on both sides of the transformer. So in this case the protection function trips have been
connected to their individual trip logic blocks (for high voltage side and low voltage side).
After connecting the trip signals into trip logic block the activation of trip contacts have to be
assigned. The trip assignment is done in Software configuration
→
Trip signals
→
Trip
assignment.
