Entirety of technical, organisational and calculatory measures for permanently securing the electricity and capacity balance in the electricity supply system; includes timetable management, measurement data management and offsetting management.
System comprising a number of power lines and the necessary auxiliary equipment and facilities for the transmission and distribution of electricity. This term does not apply to power lines that cover a limited area for local distribution, e.g. on industrial sites or inside buildings.
Auxiliary services required for the safe operation of networks. These services include system co-ordination, balance management, primary control, self-contained start and independent operation capability of generators, maintenance of voltage level (including idle component), operational measurement and compensation of active current losses.
Electricity network (grid) used for transporting electricity over large distances inside the country, and for connection to networks outside the country. Normally operated at 220/380 kV. Components of a transmission network include: a) transmission lines and pylons; b) coupling transformers, switching systems, measurement, control and communication equipment; c) installations used jointly with other network levels, most of which are used in association with the transmission network or without which it would not be possible to operate the transmission network safely and efficiently; d) switching fields before the transformer at the point of transition to another network level or to a power plant.