User Manual

System overview
3.5 Overview of the functions
3UG4 / 3RR2 monitoring relays
Manual, 02/2013, NEB927043002000/RS-AA/002
35
Monitoring relays
3UG45 3UG46
Function
01 11 12 13 8 14 15 16 17 18 31 32 33 21 22 41 24 25 51
Rated control and supply voltage
Self-powered, without auxiliary
voltage
— ✓ ✓ ✓ —✓ ✓ ✓ ✓ ✓ — — ✓ — — ✓ — — —
Externally powered, with
auxiliary 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)
The monitoring relays work with an electronic measuring method which calculates the actual
(effective) value of a measured value (tRMS), regardless of whether the measured variable's
waveform is purely sinusoidal or distorted.
The measured signal must only meet the following requirements:
● Periodic waveform (sinusoidal) within the specified frequency range
● Continuous zero crossings