ABB Relion 670 Series RES670, Technical Manual

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Table 197: 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 198: 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
Section 12
1MRK 511 365-UUS A
System protection and control
352 Phasor measurement unit RES670 2.1 ANSI
Technical manual