The measured signal must only meet the following requirements:
• Periodic waveform (sinusoidal) within the specied frequency range
• Continuous zero crossings
As long as the line on the primary or the secondary side in the environment of a frequency
converter fullls these requirements, the monitoring relays can also be operated upstream or
downstream of frequency converters. The required line quality can be ensured by using line
lters/sine-wave lters where applicable. Of course, the suitability of the relevant monitoring
relay for the monitored line frequencies must also be considered.
System overview
3.5 Overview of the functions
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 43
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