ABB RELION REX640, Техническое руководство, Страница: 1837 / 1960

the
Phase mode setting is "Three Phase", the example case does not result in any
activation.
Figure 973: Single-phase interruption for the Phase mode value "Single Phase"
10.3.5.5 Three/single-phase selection variation examples
The provided rules always apply for single-phase (
Phase mode is "Single Phase")
power systems. However, for three-phase power systems (where
Phase mode is
"Three Phase"), it is required that all the phases have to be activated before the
activation of the
START
output. Interruption event indication requires all three
phases to undershoot Voltage Int set simultaneously, as shown in Figure 969 . When
the requirement for interruption for "Three Phase" is no longer fulfilled, variation is
indicated as a dip as long as all phases are active.
In case of a single-phase interruption of
Chapter 10.3.5.4 Duration measurement ,
when there is a dip indicated in another phase but the third phase is not active,
there is no variation indication start when Phase mode is "Three Phase". In this case,
only the Phase Mode value "Single Phase" results in the
ST_B
interruption and the
ST_A
dip.
It is also possible that there are simultaneously a dip in one phase and a swell
in other phases. The functionality of the corresponding event indication with one
inactive phase is shown in
Figure 974
. Here, the "Swell + dip" variation type of
Phase
mode is "Single Phase". For the selection "Three Phase" of Phase mode, no event
indication or any activation takes place due to a non-active phase.
1MRS759142 F Power quality measurement functions
REX640
Technical Manual
1837