ABB RELION REX640 Technical Manual page 1634

Section 10
Power quality measurement functions
1628
is the same as for dips, but the different limits for the signal magnitude and times and
the inherent operating zone change (here, Voltage swell set x > 1.0 xUn) are applied.
Voltage
xUref
1.40
Voltage swell set 1
Voltage swell set 2
Voltage swell set 3
1.00
0
VVa swell time 1
0
GUID-05D50636-FB6F-4703-AC93-DB8992D4EFA4 V1 EN
Figure 839: Voltage swell operational regions
For interruption, as shown in
duration limits for interruption classification. Now the event and counter type depends
only on variation duration time.
Voltage
xUref
1.00
Voltage Int set
0
VVa Int time 1
0
GUID-01C84F8A-B150-4BB6-88A0-DEA58128949A V1 EN
Figure 840: Interruption operating regions
Generally, no event detection is done if both the magnitude and duration requirements
are not fulfilled. For example, the dip event does not indicate if the TRMS voltage
magnitude remains between Voltage dip set 3 and Voltage dip set 2 for a period shorter
than VVa dip time 3 before rising back above Voltage dip set 3.
The event indication ends and possible detection is done when the TRMS voltage
returns above (for dip and interruption) or below (for swell) the activation-starting
limit. For example, after an instantaneous dip, the event indication when the voltage
magnitude exceeds Voltage dip set 1 is not detected (and recorded) immediately but
only if no longer dip indication for the same dip variation takes place and maximum
duration time for dip variation does not exceed before the signal magnitude rises
above Voltage dip set 3. There is a small hysteresis for all these limits to avoid the
oscillation of the output activation. No drop-off approach is applied here due to the
hysteresis.
Instantaneous
Momentary
swell
swell
VVa swell time 2 VVa swell time 3
Figure 840, there is only one magnitude limit but four
Temporary
Momentary
interruption interruption
interruption
VVa Int time 2
VVa Int time 3
1MRS759142 C
Maximum duration
Temporary
swell
swell
Time (ms)
VVa Dur Max
Sustained Maximum duration
interruption
Time (ms)
VVa Dur Max
Technical Manual
REX640