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Figure 3 can experience small variations for frequencies that are not the fundamental and its harmonics, as the
measure varies for these frequencies. As an example, we can see in figure 4 how a relay measure varies when it is
set to 50 Hz, and it is being applied 60 Hz.
1,2
1
0,8
0,6
0,4
0,2
0
0
This case will never occur for the fundamental frequency and its harmonics, where the filter gain is always 1 and 0
respectively.
GEK-106273L
ANNEX 5 HARMONIC FILTERING
MEASURE
15
30
SAMPLES
MIF Digital Feeder Protection
45
60
Figure 4
75
90
15-3
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