Energinet.dk’s operations centre at Erritsö has the right to initiate less than 100 MW of manual emergency power on Great Bält without advance notice. If the emergency power is more than 100 MW, notification and approval shall take place between the staff of Energinet.dk’s operations centre at Erritsö and SvK-VHI at Network Control at Sundbyberg. Stopping of ramping Stopping of ramping represents regulating measures which are initiated automatically when the frequency in the network in Eastern or Western Denmark exceeds the established limits. Stopping of ramping is used to avoid a frequency deviation from the nominal frequency. System protection The activation criteria for emergency power and stopping of ramping can be frequency and voltage or those measured via telecommunications on the basis of a supplied signal. In the event of activation, any ongoing normal regulation will be interrupted. Activation beyond the agreed limits and regulation back to plan can only take place following approval by and between the staff of Energinet.dk’s operations centre at Erritsö and SvK-VHI at Network Control at Sundbyberg. (See also Appendix 5 System protection.) System services Manual reserves The purchases of manual reserves are decreased by 300 MW in Western Denmark under normal circumstances, and approximately 600 MW of manual reserves are maintained in Eastern Denmark. In situations where the outcome from the spot market has resulted in a flow in excess of 300 MW from east to west on Great Belt, Energinet.dk assesses whether there is a need for up to 300 MW of manual reserves in Western Denmark in the afternoon, in other words after the spot market has closed. When Great Belt is out of operation, manual reserves are purchased to Western Denmark for dimensioning faults. Intraday market Available capacity remaining after the spot market is allocated to Elbas.
Energinet.dk’s operations centre at Erritsö has the right to initiate less than 100 MW of manual emergency power on Great Bält without advance notice. If the emergency power is more than 100 MW, notification and approval shall take place between the staff of Energinet.dk’s operations centre at Erritsö and SvK-VHI at Network Control at Sundbyberg. Stopping of ramping Stopping of ramping represents regulating measures which are initiated automatically when the frequency in the network in Eastern or Western Denmark exceeds the established limits. Stopping of ramping is used to avoid a frequency deviation from the nominal frequency. System protection The activation criteria for emergency power and stopping of ramping can be frequency and voltage or those measured via telecommunications on the basis of a supplied signal. In the event of activation, any ongoing normal regulation will be interrupted. Activation beyond the agreed limits and regulation back to plan can only take place following approval by and between the staff of Energinet.dk’s operations centre at Erritsö and SvK-VHI at Network Control at Sundbyberg. (See also Appendix 5 System protection.) System services Manual reserves The purchases of manual reserves are decreased by 300 MW in Western Denmark under normal circumstances, and approximately 600 MW of manual reserves are maintained in Eastern Denmark. In situations where the outcome from the spot market has resulted in a flow in excess of 300 MW from east to west on Great Belt, Energinet.dk assesses whether there is a need for up to 300 MW of manual reserves in Western Denmark in the afternoon, in other words after the spot market has closed. When Great Belt is out of operation, manual reserves are purchased to Western Denmark for dimensioning faults. Intraday market Available capacity remaining after the spot market is allocated to Elbas.