[lo-ffm-mcl-20101014, 1, en_GB]
Figure 2-55 Effect of the measuring voltage failure
Monitoring the Phase Angle of the Positive Sequence Power
This monitoring function allows determining the direction of power flow. You can monitor the phase angle of
the complex power, and generate an indication when the power phasor is inside a settable segment.
One example of this application is the indication of capacitive reactive power. The monitoring indication can
then be used to control the overvoltage protection function. For this purpose, two angles must be set, as
shown in Figure 2-56 . In this example, φA = 200° and φB = 340° have been set.
If the measured phase angle φ(
S
1
) of the positive sequence power is innerhalb the area of the P-Q plane
delimited by the angles φA and φB, the indication
φ(PQ Pos. Seq.)
(No. 130) is output. The angles φA and
φB can be freely set in the range between 0° and 359°. The area starts at φA and extends in a mathematically
positive sense as far as the angle φB. A hysteresis of 2° is provided to prevent erroneous indications which
might emerge at the threshold limits.
[blindleistung-ind-kap-wlk040602, 1, en_GB]
Figure 2-56
Characteristic of the Positive Sequence System Phase Angle Monitoring
2.7.1.4
Functions
2.7 Monitoring Functions
138 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
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