Overview
The “Multipurpose filter (SMAIHPAC)” function block is arranged as a three- phase filter. It has very much the same user interface (e.g. inputs and outputs) as the standard pre-processing function block SMAI. However the main difference is that it can be used to extract any frequency component from the input signal. Thus it can, for example, be used to build sub-synchronous resonance protection for synchronous generator.
For more detailed information on “Multipurpose filter (SMAIHPAC)” function, refer to ABB, Relion 670 Series manuals.
To see other supported functions, click here.
Function Identification
| Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |
| Multipurpose filter | SMAIHPAC | – | – |
Signals & Setting Parameters
Function block
SMAIHPAC Input signals
| SMAIHPAC Input signals | |||
| Name | Type | Default | Description |
| G3P | GROUP SIGNAL | – | Analog input group from SMAI |
| BLOCK | BOOLEAN | 0 | Block of function |
SMAIHPAC Output signals
| 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 | |
SMAIHPAC Non group settings (basic)
| 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 |
Length of the filtering window
| Value for parameter FilterLength |
Used No of samples for calculation (fixed, independent from rated frequency) |
Corresponding length of the input waveform in miliseconds for 50Hz power system |
Corresponding length of the input waveform in miliseconds for 60Hz power system |
| 0.1 s | 128 = 27 | 128 ms | 107 ms |
| 0.2 s | 256 = 28 | 256 ms | 213 ms |
| 0.5 s | 512 = 29 | 512 ms | 427 ms |
| 1.0 s | 1024 = 210 | 1024 ms | 853 ms |
| 2.0 s | 2048 = 211 | 2048 ms | 1707 ms |
| 4.0 s | 4096 = 212 | 4096 ms | 3413 ms |
Pass frequency band due to FilterLength
| Value for parameter FilterLength | For 50Hz power system | For 60Hz power system |
| 0.1 s | +-22.5 Hz | +-27.0 Hz |
| 0.2 s | +-11.5 Hz | +-14.0 Hz |
| 0.5 s | +-6.0 Hz | +-7.2 Hz |
| 1.0 s | +-3.0 Hz | +-3.6 Hz |
| 2.0 s | +-1.5 Hz | +-1.8 Hz |
| 4.0 s | +-0.8 Hz | +-1.0 Hz |
Logics & highlights
Example of filter calculation (SetFrequency= 31.0 Hz , FilterLength= 1.0 s , OverLap = 75% , FreqBandWidth= 0.0 Hz)
