ABB RELION 670 Series Technical Manual page 728

Section 12
System protection and control
Table 417: SMAIHPAC Output signals
Name
AI3P
AI1
AI2
AI3
AI4
12.1.5 Settings
Table 418: SMAIHPAC Non group settings (basic)
Name Values (Range)
ConnectionType Ph - Ph
Ph - N
SetFrequency 2.0 - 500.0
FreqBandWidth 0.0 - 60.0
FilterLength 0.1 s
0.2 s
0.5 s
1.0 s
2.0 s
4.0 s
OverLap 0 - 95
12.1.6 Operation principle
For all four analogue input signals into this filter (i.e. three phases and the residual quantity) the
input samples from the TRM module which are coming at rate of 20 samples per fundamental
system cycle are first stored. When enough samples are available in the internal memory, the
phasor values at set frequency defined by the setting parameter
following values are internally available for each of the calculated phasors:
• Magnitude
• Phase angle
• Exact frequency of the extracted signal
Note that the special filtering algorithm is used to extract these phasors. This algorithm is
different from the standard one-cycle Digital Fourier Filter typically used by the numerical IEDs.
This filter provides extremely good accuracy of measurement and excellent noise rejection, but at
the same time it has much slower response time. It is capable to extract phasor (i.e. magnitude,
phase angle and actual frequency) of any signal (e.g. 37,2Hz) present in the waveforms of the
connected CTs and/or VTs. The magnitude and the phase angle of this phasor are calculated with
722
Type Description
GROUP SIGNAL Analog input 3-phase group
GROUP SIGNAL Analog input 1
GROUP SIGNAL Analog input 2
GROUP SIGNAL Analog input 3
GROUP SIGNAL Analog input 4
Unit Step
- -
Hz 0.1
Hz 0.1
- -
% 5
Default Description
Ph - N Analogue input connection type
50.0 Desired frequency to be extracted by the
filter
0.0 Extra added frequency band around the
set frequency
1.0 s Approximate length of the filtering
window in seconds
20 Filtering window overlap between two
calculations in percent
SetFrequency are calculated. The
1MRK 502 066-UUS B
PID-3390-OUTPUTSIGNALS v7
GUID-5EA398AD-66E2-4240-8918-4332995CED11 v1
PID-3390-SETTINGS v7
GUID-262C1783-3A0A-46B6-99FC-1202AE8E7519 v2
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