| Frequency range | Time period for operation |
|---|---|
| 47,0 Hz-47,5 Hz | 60 seconds |
| 47,5 Hz-48,5 Hz | To be specified by each relevant TSO, but longer than established times for generation and demand according to Regulation (EU) 2016/631 and Regulation (EU) 2016/1388 respectively, and longer than for DC-connected PPMs according to Article 39 |
| 48,5 Hz-49,0 Hz | To be specified by each relevant TSO, but longer than established times for generation and demand according to Regulation (EU) 2016/631 and Regulation (EU) 2016/1388 respectively, and longer than for DC-connected PPMs according to Article 39 |
| 49,0 Hz-51,0 Hz | Unlimited |
| 51,0 Hz-51,5 Hz | To be specified by each relevant TSO, but longer than established times for generation and demand according to Regulation (EU) 2016/631 and Regulation (EU) 2016/1388 respectively, and longer than for DC-connected PPMs according to Article 39 |
| 51,5 Hz-52,0 Hz | To be specified by each relevant TSO, but longer than for DC-connected PPMs according to Article 39 |
Table 1: Minimum time periods an HVDC system shall be able to operate for different frequencies deviating from a nominal value without disconnecting from the network.