CHAPTER 2

Neighbouring TSOs shall exchange at least the following structural information related to the observability area: the regular topology of substations and other relevant data, by voltage level; technical data on transmission lines; technical data on transformers connecting the DSOs, SGUs which are demand facilities and generators' block-transformers of SGUs which are power generating facilities; the maximum and minimum active and reactive power of SGUs which are power generating modules; technical data on phase-shifting transformers; technical data on HVDC systems; technical data on reactors, capacitors and static volt-ampere reactive (VAR) compensators; and operational security limits defined by each TSO according to Article 25. To coordinate the protection of their transmission systems, neighbouring TSOs shall exchange the protection setpoints of the lines for which the contingencies are included as external contingencies in their contingency lists. To coordinate their operational security analysis and to establish the common grid model in accordance with Articles 67, 68, 69 and 70, each TSO shall exchange, with at least all other TSOs from the same synchronous area, at least the following data: the topology of the 220 kV and higher voltage transmission systems within its control area; a model or an equivalent of the transmission system with voltage below 220 kV with significant impact on its own transmission system; the thermal limits of the transmission system elements; and a realistic and accurate forecasted aggregate amount of injection and withdrawal, per primary energy source, at each node of the transmission system, for different time-frames. To coordinate the dynamic stability assessments pursuant to Article 38(2) and (4), and to carry them out, each TSO shall exchange with the other TSOs of the same synchronous area or of its relevant part the following data: data concerning SGUs which are power generating modules relating to, but not limited to: electrical parameters of the alternator suitable for the dynamic stability assessment, including total inertia; protection models; alternator and prime mover; step-up transformer description; minimum and maximum reactive power; voltage models and speed controller models; and prime movers models and excitation system models suitable for large disturbances; the data on type of regulation and voltage regulation range concerning tap changers, including the description of existing on-load tap changers, and the data on type of regulation and voltage regulation range concerning step-up and network transformers; and the data concerning HVDC systems and FACTS devices on the dynamic models of the system or the device and its associated regulation suitable for large disturbances. In accordance with Articles 18 and 19, each TSO shall exchange with the other TSOs of the same synchronous area the following data on the system state of its transmission system using the IT tool for real-time data exchange at pan-European level as provided by ENTSO for Electricity: frequency; frequency restoration control error; measured active power interchanges between LFC areas; aggregated generation infeed; system state in accordance with Article 18; setpoint of the load-frequency controller; and power interexchange via virtual tie-lines. Each TSO shall exchange with the other TSOs in its observability area the following data about its transmission system using real-time data exchanges between the TSOs' supervisory control and data acquisition (SCADA) systems and energy management systems: actual substation topology; active and reactive power in line bay, including transmission, distribution and lines connecting SGUs; active and reactive power in transformer bay, including transmission, distribution and SGUs connecting transformers; active and reactive power in power generating facility bay; regulating positions of transformers, including phase-shifting transformers; measured or estimated busbar voltage; reactive power in reactor and capacitor bay or from a static VAR compensator; and restrictions on active and reactive power supply capabilities with respect to the observability area. Each TSO shall have the right to request all TSOs from its observability area to provide real-time snapshots of state estimated data from that TSO's control area if that is relevant for the operational security of the transmission system of the requesting TSO.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-04 · Text as adopted (Official Journal); later amendments are not incorporated in this text.