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2 Functions
Figure 2-62
Figure 2-63
Trajectory Continu-
The rate of change of the impedance vector is very important for the differentiation
ity and Monotony
between faults and power swing conditions. This is shown in Figure 2-63. During the
power swing the measured impedance from one sample to the next has a defined
change in R and X, referred to as dR(k) and dX(k). Important is also the fact that from
one sample to the next the difference is small: i.e. |dR(k) – dR(k+1)| < threshold.
During a fault entry there is a rapid change that will not cause the power swing function
to pick up.
170
Pickup characteristic of the power swing detection for the MHO characteristic
Impedance vector during power swing
7SD5 Manual
C53000-G1176-C169-1
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