some examples how this parameter influence the calculation rate for the extracted
phasor:
•
when
OverLap
=0% the new phasor value is calculated only once per
FilterLength
•
when
OverLap
=50% the new phasor value is calculated two times per
FilterLength
•
when
OverLap
=75% the new phasor value is calculated four times per
FilterLength
•
when
OverLap
=90% the new phasor value is calculated ten times per
FilterLength
12.1.7
Filter calculation example
In the following Figure an example from an installation of this filter on a large, 50 Hz
turbo generator with a rating in excess of 1000 MVA is presented. In this installation
filter is used to measure the stator sub-synchronous resonance currents. For this
particular installation the following settings were used for the filter:
•
SetFrequency
= 31.0 Hz
•
FilterLength
= 1.0 s
•
OverLap
= 75%
•
FreqBandWidth
= 0.0 Hz
IEC13000178-2-en.vsd
A
B
C
IEC13000178 V3 EN
Figure 284:
Example of filter calculation
Section 12
1MRK502052-UEN B
System protection and control
600
Technical manual
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