Note
Use shielded, twisted, and grounded cables for transformer connecting cables with a length of
more than 10 m.
13.2.5.3 Potential for optimization
Potential for optimization in the event of extremely high currents, false tripping due to high
starting currents or in environments with high EMC interference
1. Extend the ON-delay time to fade out fault currents measured during motor startup.
2. Extend the tripping delay time to prevent false tripping due to EMC interference.
3. Select a residual current transformer with a larger internal diameter. The reduced magnetic
eld strength that passes through the transformer due to the extended distance between
power cables and transformer reduces the measuring accuracy but also the susceptibility to
interference.
Accessories
13.2 Accessories for 3UG4 monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
254 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
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