2 Functions
48
7UM61 Manual
C53000-G1176-C127-3
Figure 2-7 Logic Diagram of I>> Stage with Direction Element
2.7.2 Setting Notes
General The high current stage I>> of the time overcurrent protection will only be effective and
available if address 113 O/C PROT. I>> is set to either directional or Non-
Directional on configuration. If the function is not needed it is set to Disabled.
If direction acquisition is used, make sure that the CT and VT sets are consistent.
High-current Stage
I>>
Address 1301 O/C I>> is used to switch the definite time I>> stage for phase currents
ON and OFF, or to block only the trip command (Block relay). The high-current
stage I>> (Parameter 1302 and its associated delay time T I>>, 1303) is used for
current grading with large impedances existing for example with transformers, motors
or generators. It is set in a way ensuring that it picks up for faults up to this impedance.
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