the
Phase mode
setting is "Three Phase", the example case does not result in any
activation.
Figure 365: Single-phase interruption for the Phase mode value "Single Phase"
10.3.4.5 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 361
. 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
Figure 365
, 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 366
. 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.
1MRS758755 C
Power quality measurement functions
REC615 & RER615
Technical Manual
715
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