The appropriate group ( U/I or P/Q/S ) of average maxs/mins is affected by single clearing only ! Each group
must be cleared individually.
If the instrument is locked, the clearing is not possible.
2.4 Full Spectrum Values P/Q/PF & Fundamental Harmonic Values
Pfh / Qfh / cos φ
As standard, active and reactive powers (and therefore power factor) are evaluated from full spectrum of harmonic
components of both voltage and current.
Sometimes (for example for power factor compensation system checking), it is useful to know fundamental harmonic part of
these quantities too. Such quantities are marked Pfh, Qfh, cos φ.
As you can see on the navigation chart you can navigate from
the full spectrum values branch
with the
key further right
into
the fundamental harmonic values branch
and vice versa. To distinguish actual displayed branch, the
H
symbol is
displayed for the fundamental harmonic branch.
Exception : Actual values only of fundamental harmonic power factor –
the cos φ
– are evaluated (no average values
available). Next, this fundamental harmonic power factor can be expressed not only as
cos φ
, but as
tan φ
or
φ
too,
depending on setting of parameter 09.
2.5 Fundamental Harmonic Power Factor Formats cosφ / tanφ / φ
The fundamental harmonic power factor can be expressed not only as cos φ, but as tan φ or φ too, depending on setting of
parameter 09.
For outright specification of the quadrant, the power factor of the fundamental harmonic component is accompanied with two
attributes :
•
a sign (
+
or
-
), which indicates polarity of appropriate active power
•
a symbol
or
, which indicates the power factor character
At the following figures there are examples of three-phase fundamental power factor presentations :
Fundamental Harmonic Power Factor Formats