CIRCUTOR AR6 Series - Manual (Page 40)

AR6 portable network analyzer
Page 40 of 69 User Manual
11.4.1 Events grouping in accordance with UNIPEDE criteria
- In three-phase systems a swell starts when the value U
RMS
of the voltage of one or more
phases exceeds the set-point for detecting an over-voltage (usually 110% of rated value); it
ends when the value U
RMS
for all the phases is less than or equal to the set-point minus the
configured hysteresis value (t0)
Fig.11-9.- Start and end of a swell in a three-phase system
- In three-phase systems a sag starts when the value U
RMS
of the voltage of one or more
phases is below the threshold for detecting sags (usually 90% of rated value); it ends when
the U
RMS
is greater than or equal to the threshold plus the configured hysteresis value (t1)
or if all phases are below the interruption level (usually 10% of rated value).
Fig.11-10.- Start and end of a sag in a three-phase system
- In three-phase systems an interruption starts when the value U
RMS
of the voltage of all the
phases is below the threshold for detecting interruptions (usually 10% of rated value); it
ends when the value URMS of any phase is greater than or equal to the threshold plus the
configured hysteresis value (t2).
Fig.11-11.- Start and end of an interruption in a three-phase system
In the values shown for the individual phases, the time shown refers to each event; no
grouping is done.
The available dynamic menu options for the UNIPEDE table screen are: