Three/Single-Phase Selection Variation Examples - ABB RELION REX640 Technical Manual

Section 10
Power quality measurement functions
10.3.5.5
1630
The duration measurement module measures the voltage variation duration of each
phase voltage separately when the Phase mode setting is "Single Phase". The phase
variation durations are independent. However, when the Phase mode setting is "Three
Phase", voltage variation may start only when all the monitored phases are active. An
example of variation duration when Phase mode is "Single Phase" can be seen in
Figure 841. The voltage variation in the example is detected as an interruption for the
phase B and a dip for the phase A, and also the variation durations are interpreted as
independent U_B and U_A durations. In case of single-phase interruption, the DIPST
output is active when either ST_A or ST_B is active. The measured variation
durations are the times measured between the activation of the ST_A or ST_B outputs
and deactivation of the ST_A or ST_B outputs. When the Phase mode setting is
"Three Phase", the example case does not result in any activation.
GUID-7F92C5E5-CD19-410D-BC6C-D47150C9743B V1 EN
Figure 841: Single-phase interruption for the Phase mode value "Single Phase"

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
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
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
Figure 841, when there is a dip indicated in
842. Here, the "Swell + dip" variation type of Phase mode is
1MRS759142 C
Figure 837. When the
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