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Appendix B – INFORMA PMD-A Functions
INFORMA PMD-A provides the following FR data types on which different types of sensors
can be configured.
FR Calculated
Quantity
Frequency
RMS
Fundamental/Full
Power
Sequence
components
amplitude
AC RMS /DC
Magnitude for
standalone
channels
Over: Applied on all FR parameters. If the computed value of the configured parameters
exceeds the "Over_Start -threshold calculated" value, then the event is triggered. If the
computed value of that configured parameter reduces below the "Over_Stop -threshold
calculated" value later, then the event is de-triggered. Corresponding logs and records are
generated.
Under: Applied on all FR parameters. If the computed value of the configured parameters
reduces below the "Under_Start -threshold calculated" value, then the event is triggered. If
the computed value of that configured parameter exceeds the "Under_Stop -threshold
calculated" value later, then the event is de-triggered. Corresponding logs and records are
generated.
Both: Applied on all FR parameters. If the computed value of the configured parameters
reduces below the "Under_Start -threshold calculated" values, OR exceeds the "Over_Start -
threshold calculated" value, then the event is triggered. If the computed value of that
configured parameter exceeds the "Under_Stop -threshold calculated" value, OR reduces
below the "Over_Stop -threshold calculated" value later, then the event is de-triggered.
Retriggering happens if the parameter value swings between Under to Over and vice-versa.
Corresponding logs and records are generated.
Power Swing: Applied on frequency and power values. The event is triggered when it
detects poorly dampened oscillations. It is de-triggered if normal condition resumes.
Dx/dt: Applied on RMS values of voltage and current, frequency, and power values. The
event is triggered when it detects magnitude variations. It is de-triggered if normal condition
resumes.
Over
Under
x
x
x
x
x
x
x
x
x
x
BOTH
x
x
x
x
x
182
Power
ROC (dx/dt)
Swing
x
x
-
x
x
x
-
-
-
-
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