Voltage swell set 3
Voltage swell set 2
Voltage swell set 1
Voltage
xUref
Time (ms)
0
0
VVa Dur MaxVVa swell time 3VVa swell time 1 VVa swell time 2
1.40
Instantaneous
swell
Temporary
swell
Momentary
swell
Maximum duration
swell
1.00
GUID-7F23358A-5B42-4F5B-8F12-B157208C8945 V1 EN
Figure 416: Voltage swell operational regions
For interruption, as shown in Figure 417, there is only one magnitude limit but four
duration limits for interruption classification. Now the event and counter type
depends only on variation duration time.
Voltage Int set
Voltage
xUref
Time (ms)
0
0
VVa Dur Max
VVa Int time 3
VVa Int time 1 VVa Int time 2
1.00
Momentary
interruption
Sustained
interruption
Temporary
interruption
Maximum duration
interruption
GUID-AA022CA2-4CBF-49A1-B710-AB602F8C8343 V1 EN
Figure 417: 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.
1YHT530004D05 D Section 10
Power quality measurement functions
615 series 777
Technical Manual
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