ANNEX IIISupplementary provisions
ANNEX III Voltage ranges referred to in Article 18 Synchronous Area Voltage Range Time period for operation Continental Europe 0,85 pu-1,118 pu Unlimited 1,118 pu-1,15 pu To be established by each relevant system operator, in coordination with the relevant TSO but not less than 20 minutes Nordic 0,90 pu-1,05 pu Unlimited 1,05 pu-1,10 pu 60 minutes Great Britain 0,90 pu-1,10 pu Unlimited Ireland and Northern Ireland 0,90 pu-1,118 pu Unlimited Baltic 0,85 pu-1,118 pu Unlimited 1,118 pu-1,15 pu 20 minutes Table 4 : Minimum time periods an HVDC system shall be capable of operating for voltages deviating from the reference 1 pu value at the connection points without disconnecting from the network. This table applies in case of pu voltage base values at or above 110 kV and up to (not including) 300 kV. Synchronous Area Voltage Range Time period for operation Continental Europe 0,85 pu-1,05 pu Unlimited 1,05 pu-1,0875 pu To be specified by each TSO, but not less than 60 minutes 1,0875 pu-1,10 pu 60 minutes Nordic 0,90 pu-1,05 pu Unlimited 1,05 pu-1,10 pu To be specified by each TSO, but not more than 60 minutes Great Britain 0,90 pu-1,05 pu Unlimited 1,05 pu-1,10 pu 15 minutes Ireland and Northern Ireland 0,90 pu-1,05 pu Unlimited Baltic 0,88 pu-1,097 pu Unlimited 1,097 pu-1,15 pu 20 minutes Table 5 : Minimum time periods an HVDC system shall be capable of operating for voltages deviating from the reference 1 pu value at the connection points without disconnecting from the network. This table applies in case of pu voltage base values from 300 kV to 400 kV (included).