The filter time eliminates debounces and short disturbances on a binary input. The filter time is set for each binary input of the protection relay.
- 1
- t 0
- 2
- t 1
- 3
- Input signal
- 4
- Filtered input signal
- 5
- Filter time
At the beginning, the input signal is at the high state, the short low state is filtered and no input state change is detected. The low state starting from the time t 0 exceeds the filter time, which means that the change in the input state is detected and the time tag attached to the input change is t 0. The high state starting from t 1 is detected and the time tag t 1 is attached.
Each binary input has a filter time parameter "Input # filter", where # is the number of the binary input of the module in question (for example "Input 1 filter").
| Parameter | Values | Default |
|---|---|---|
| Input # filter time | 10...100 ms | 10 ms |