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Page 10
3.2.6
Inverter grid parameter setting: frequency protection
Tap ‘Grid Frequency Protection, the next page will display the parameters.
There are three threshold level for the over-frequency and underfrequency protection. The first threshold means the
smallest range, and the third threshold means the largest range.
All thresholds need to follow the principles as below:
1.
The first maximum threshold ≤ The second maximum threshold ≤ The
third maximum threshold
2.
The first minimum threshold ≥ The second minimum threshold ≥ The third minimum threshold
3.
The first threshold tripping time ≤ The second threshold tripping time ≤ The third threshold tripping time
Fig. 20: Grid frequency protection
