User Manual

Parameters
3UG4 / 3RR2 monitoring relays
Manual, 02/2013, NEB927043002000/RS-AA/002
357
Fault current monitoring
If fault current monitoring has been activated (I >> = yes) and the total current of the load
currents at terminals 1L1 / 2T1, 3L2 / 4T2 and 5L3 / 6T3 rises above the permissible
threshold (S00: 1.5 A / S0: 4 A), the ON-delay time onDel, the tripping delay time Del, and
the restart delay time RsDel are stopped and both the CO contact and the semiconductor
output change their switching state immediately (≤ 200 ms).
Indication on the display: I >>
= yes
Nominal fault current of the summation current transformer
The 3UL22 summation current transformers differ in size (size of the let-through opening)
and within each size by different nominal currents for which the summation current
transformers are rated.
For the 3UG4624 fault current monitoring relay to be able to indicate the real fault current,
the nominal fault current IΔn of the connected summation current transformer must be set.
Possible indications on the display: IΔn
Phase sequence monitoring
If phase sequence monitoring has been activated and the load currents exhibit the wrong
phase sequence, the CO contact and the semiconductor output will change their switching
status immediately (≤ 200 ms).
Possible indications on the display: