Variation Validation - ABB RELION REX640 Technical Manual

1MRS759142 C
10.3.5.3
REX640
Technical Manual
The activation of the BLOCK input resets the function and outputs.

Variation validation

The validation criterion for voltage variation is that the measured total variation
duration is between the set minimum and maximum durations (Either one of VVa dip
time 1, VVa swell time 1 or VVa Int time 1, depending on the variation type, and VVa
Dur Max). The maximum variation duration setting is the same for all variation types.
Figure 838 shows voltage dip operational regions. In
swell/Int set is drawn, whereas in this figure there are three sub-limits for the dip
operation. When Voltage dip set 3 is undershot, the corresponding ST_x and also the
DIPST outputs are activated. When the TRMS voltage magnitude remains between
Voltage dip set 2 and Voltage dip set 1 for a period longer than VVa dip time 2 (shorter
time than VVa dip time 3), a momentary dip event is detected. Furthermore, if the
signal magnitude stays between the limits longer than VVa dip time 3 (shorter time
than VVa Dur max), a temporary dip event is detected. If the voltage remains below
Voltage dip set 1 for a period longer than VVa dip time 1 but a shorter time than VVa
dip time 2, an instantaneous dip event is detected.
For an event detection, the OPERATE output is always activated for one task cycle.
The corresponding counter and only one of them (INSTDIPCNT, MOMDIPCNT or
TEMPDIPCNT) is increased by one. If the dip limit undershooting duration is shorter
than VVa dip time 1, VVa swell time 1 or VVa Int time 1, the event is not detected at all,
and if the duration is longer than VVa Dur Max, MAXDURDIPCNT is increased by
one but no event detection resulting in the activation of the OPERATE output and
recording data update takes place. These counters are available through the monitored
data view on the LHMI or through tools via communications. There are no phase-
segregated counters but all the variation detections are registered to a common time/
magnitude-classified counter type. Consequently, a simultaneous multiphase event,
that is, the variation-type event detection time moment is exactly the same for two or
more phases, is counted only once also for single-phase power systems.
Voltage
xUref
1.00
Voltage dip set 3
Voltage dip set 2
Voltage dip set 1
0
VVa dip time 1
0
GUID-129A31C9-0C5C-4A3D-AFCC-8B42880E63DE V1 EN
Figure 838: Voltage dip operational regions
In Figure 839, the corresponding limits regarding the swell operation are provided
with the inherent magnitude limit order difference. The swell functionality principle
Power quality measurement functions
Momentary
dip
Instantaneous
dip
VVa dip time 2 VVa dip time 3
Section 10
Figure 837, only one voltage dip/
Temporary Maximum duration
dip dip
Time (ms)
VVa Dur Max
1627