Table 339:
SMAIHPAC Output signals
Name
Type
Description
AI3P
GROUP SIGNAL
Analog input 3-phase group
AI1
GROUP SIGNAL
Analog input 1
AI2
GROUP SIGNAL
Analog input 2
AI3
GROUP SIGNAL
Analog input 3
AI4
GROUP SIGNAL
Analog input 4
12.1.5
Settings
Table 340:
SMAIHPAC Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
ConnectionType
Ph - Ph
Ph - N
-
-
Ph - N
Analogue input connection type
SetFrequency
2.0 - 500.0
Hz
0.1
50.0
Desired frequency to be extracted by the
filter
FreqBandWidth
0.0 - 60.0
Hz
0.1
0.0
Extra added frequency band around the
set frequency
FilterLength
0.1 s
0.2 s
0.5 s
1.0 s
2.0 s
4.0 s
-
-
1.0 s
Approximate length of the filtering window
in seconds
OverLap
0 - 95
%
5
20
Filtering window overlap between two
calculations in percent
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
SetFrequency
are calculated. The 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
Section 12
1MRK502052-UEN B
System protection and control
596
Technical manual
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