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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 pickup 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 the maximum duration time for
dip variation is not exceeded 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.
Consequently, only one event detection and recording of the same variation type can take
place for one voltage variation, so the longest indicated variation of each variation type is
detected. Furthermore, it is possible that another instantaneous dip event replaces the one
already indicated if the magnitude again undershoots
Voltage dip set 1
for the set time after
the first detection and the signal magnitude or time requirement is again fulfilled. Another
possibility is that if the time condition is not fulfilled for an instantaneous dip detection but
the signal rises above
Voltage dip set 1
, the already elapsed time is included in the
momentary dip timer. Especially the interruption time is included in the dip time. If the
signal does not exceed
Voltage dip set 2
before the timer
VVa dip time 2
has elapsed when
the momentary dip timer is also started after the magnitude undershooting
Voltage dip set
2
, the momentary dip event instead is detected. Consequently, the same dip occurrence
with a changing variation depth can result in several dip event indications but only one
detection. For example, if the magnitude has undershot
Voltage dip set 1
but remained
above
Voltage Intr set
for a shorter time than the value of
VVa dip time 1
but the signal rises
between
Voltage dip set 1
and
Voltage dip set 2
so that the total duration of the dip
activation is longer than
VVa dip time 2
and the maximum time is not overshot, this is
detected as a momentary dip even though a short instantaneous dip period has been
included. In text, the terms "deeper" and "higher" are used for referring to dip or
interruption.
Although examples are given for dip events, the same rules can be applied to the swell and
interruption functionality too. For swell indication, "deeper" means that the signal rises
even more and "higher" means that the signal magnitude becomes lower respectively.
The adjustable voltage thresholds adhere to the relationships:
VVa dip time 1
≤
VVa dip time 2
≤
VVa dip time 3
.
VVa swell time 1
≤
VVa swell time 2
≤
VVa swell time 3
.
VVa Int time 1
≤
VVa Int time 2
≤
VVa Int time 3
.
There is a validation functionality built-in function that checks the relationship adherence
so that if
VVa x time 1
is set higher than
VVa x time 2
or
VVa x time 3
,
VVa x time 2
and
VVa
x time 3
are set equal to the new
VVa x time 1
. If
VVa x time 2
is set higher than
VVa x time 3
,
VVa x time 3
is set to the new
VVa x time 2
. If
VVa x time 2
is set lower than
VVa x time 1
,
1MAC059074-MB A
Section 10
Power quality measurement functions
615 series ANSI
1047
Technical Manual
Summary of Contents for Relion 615 series
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