Vetrino–Isaccea–Yuzhnoukrainsk powerline

An agreement to construct a 750 kV powerline from Ukraine through Romania to Bulgaria, together with the construction of the South Ukraine Nuclear Power Plant, was signed in Moscow in 1982 by the electrical industry ministers of the Soviet Union, Romania, and Bulgaria. Work on the powerline started in 1986 and was completed in 1988.^[1]

The powerline starts in Bulgaria at Vetrino (Suvorovo) substation near Varna and runs northward. In Dobrudja it crosses the border between Romania and Bulgaria and terminates at Isaccea substation in Romania. From there the line crosses the Danube River, which forms the border between Ukraine and Romania in a 938 metres long span on two 118 metres tall delta pylons situated east of Isaccea and runs then to Pivdennoukrainsk (formerly Yuzhnoukrainsk) substation situated just north of South Ukraine Nuclear Power Plant.

Hereby it crosses at least four times the border between Moldova and Ukraine. However, there is and was no branch to the power grid in Moldova, although it passes the Vulcăneşti substation.

The towers used are designed to carry a single circuit on a single level. Each conductor consists of a bundle of four wires. Nearly all suspension towers are portal pylons, most of them guyed, though several are free-standing. The free-standing portal pylons support the middle conductor on a V-shaped insulator, while the outer conductors, as in the guyed suspension towers, are supported by standard suspension insulators. For strain towers, triple structures are used; however, a fourth tower is required when there is little or no change in direction to maintain the necessary clearance between the outermost conductor and the tower. Transposition towers are also implemented as monopolar towers, requiring two additional towers.

The section between Vetrino and Isaccea is since the synchronisation of the Romanian power grid with that of Western Europe, which took after 6 years of trial operation finally take place in 2003 , operated with 400 kV. The section between Isaccea and Pivdennoukrainsk is since the synchronisation of the Romanian power grid with that of Western Europe not in use and scrapped in most parts.

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