ABB RELION Series, Техническое руководство

Страница: 693 / 804

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 366 . 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-22014C0F-9FE2-4528-80BA-AEE2CD9813B8 V1 EN
Figure 366: 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 362 . 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 366 , 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 367 . Here, the "Swell + dip" variation type of Phase mode is
1MRS758755 A
Section 10
Power quality measurement functions
REC615 and RER615 687
Technical Manual