IEC13000178-2-en.vsd
A
B
C
IEC13000178 V3 EN
Figure 122:
Example of filter calculation
The data shown in the Figure comes from the comtrade file captured by the IED. The
following traces are presented in this Figure.
a) Waveforms of the stator three-phase currents given in primary kA.
b) RMS value of the sub-synchronous resonance current extracted by the filter in primary
amperes.
c) Frequency of the extracted sub-synchronous resonance current provided by the filter in
Hz.
Note the very narrow scale on the y-axle for b) and c). Such small scale as well indicates
with which precision and consistency the filter calculates the phasor magnitude and
frequency of the extracted stator sub-synchronous current component.
The following can be observed in the Figure:
•
The stator total RMS current value is around 33 kA primary.
•
The measured magnitude of the sub-synchronous current is around 173 A primary
(that is, 0.5% of the fundamental 50 Hz component).
•
The frequency of this sub-synchronous current component is 31.24 Hz.
1MRK 511 365-UUS A
Section 12
System protection and control
Phasor measurement unit RES670 2.1 ANSI
357
Technical manual
Содержание Relion 670 Series RES670
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