SMY133-SMY134-SMP133 Operating Manual
For outright specification of the quadrant, the power factor of the fundamental harmonic component –
cos φ
– is expressed according to the graph with two attributes :
•
a sign
(
+
or
-
), which indicates polarity of active power
•
a character
(
L
or
C
), which indicates the power factor character ( the polarity of reactive
power relative to the active power )
Voltage and current unbalance evaluation is based on negative/positive sequences of voltage and
current fundamental harmonic components :
Voltage unbalance :
unb
U
=
voltage negative sequence
voltage positive sequence
∗
100 %
Current unbalance :
unb
I
=
current negative sequence
current positive sequence
∗
100 %
Current negative sequence angle :
φnsI
All of angle values are expressed in degrees in range [ -180.0 ÷ +179.9 ].
4.3.1.5 Temperature
Both the internal temperature
Ti
and the external temperature
Te
(at selected models only) are
measured and updated each approx. 10 seconds.
4.3.1.6 “ The Fixscan” Mode
The instrument is primarily designed to measure distribution networks with the nominal frequency of
50 or 60 Hz. Sampling, processing, and aggregation of a measured signal when setting the f
NOM
parameter to one of these two values is described above and corresponds to the standards specified
in technical parameters.
However, there are other applications, such as:
•
networks with f
NOM
= 400 Hz
26
Fig. 4.20 : Identification of consumption- supply and the character of reactive power according to
phase difference
Ir+
Ia+
S
Q
P
Ir-
Ia-
quadrant I
active power import
reactive power import
power factor inductive (L) character
quadrant II
active power export
reactive power import
power factor capacitive (C) character
quadrant IV
active power import
reactive power export
power factor capacitive (C) character
quadrant III
active power export
reactive power export
power factor inductive (L) character
