Siemens SIRIUS 3UG4 - Page 42

Function Monitoring relays
3UG45 3UG46
01 11 12 13 8 14 15 16 17 18 31 32 33 21 22 41 25 51
Monitoring for N conductor
failure
— — — — — — — ✓ — ✓ — — — — — — — —
Automatic direction of rotation
correction in the case of incorrect
phase sequence
— — — — — — — — ✓ ✓ — — — — — — — —
Power factor monitoring and current monitoring
Monitoring for undercurrent — — — — — — — — — — — — — 1p 1p 1p — —
Monitoring for overcurrent — — — — — — — — — — — — — 1p 1p 1p — —
Active current monitoring — — — — — — — — — — — — — — — ✓ — —
Apparent current monitoring — — — — — — — — — — — — — ✓ ✓ — — —
Power factor monitoring — — — — — — — — — — — — — — — ✓ — —
Fault current monitoring/insulation monitoring
Monitoring for fault current/
ground fault
— — — — — — — — — — — — — — — — ✓ —
Insulation monitoring — — — — ✓ — — — — — — — — — — — — —
Filling level monitoring
Monitoring for 󹪝lling level over‐
shoot / resistance overshoot
✓ — — — — — — — — — — — — — — — — —
Monitoring for 󹪝lling level under‐
shoot / resistance undershoot
✓ — — — — — — — — — — — — — — — — —
Speed monitoring
Monitoring for speed overshoot — — — — — — — — — — — — — — — — — ✓
Monitoring for speed undershoot — — — — — — — — — — — — — — — — — ✓
Rated control supply voltage
Self-powered, without auxiliary
voltage
— ✓ ✓ ✓ — ✓ ✓ ✓ ✓ ✓ — — ✓ — — ✓ — —
Externally powered, with auxili‐
ary voltage
✓ — — — ✓ — — — — — ✓ ✓ — ✓ ✓ — ✓ ✓
✓: Function available
1p: Monitoring is 1-phase
3p: Monitoring is 3-phase
— : Function not available
○: Function available with limitations
1)
Detection causes problems with regenerative power recovery.
2)
By monitoring the voltage thresholds.
True root mean square measurement (tRMS) / use with frequency converters:
The monitoring relays work with an electronic measuring method which calculates the actual
(e󹪜ective) value of a measured value (tRMS), regardless of whether the measured variable's
waveform is purely sinusoidal or distorted.
System overview
3.5 Overview of the functions
SIRIUS 3UG4 / 3RR2 monitoring relay
42 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005