thumb|PSK-300A and PS-400A (U400A) [[Insulator (electrical)|disc suspension insulators used on 1150 kV powerlines in comparison with common U70BL insulator]]
The Ekibastuz–Kokshetau high-voltage line is an alternating current electrical power transmission line in Kazakhstan from Ekibastuz to Kokshetau. It was the first commercially used power line in the world which operated at 1,150 kV, the highest transmission line voltage in the world. It is a part of the Itatsk (Sharypovo)–Barnaul–Ekibastuz–Kokshetau–Kostanay–Chelyabinsk (Siberia–Kazakhstan–Urals) transmission system, which was designed to transfer electricity from Siberia and Kazakhstan to industrial regions in the Urals.
Designated as power line number 1101, it runs from Ekibastuz to Kokshetau. It is mounted on transmission towers with an average height of . The weight of the conductors between the spans is approximately 50 tons. With a voltage of 1,150 kV, the line had a maximum transfer capacity of 5,500 MW.
The whole length of the Siberia–Kazakhstan–Urals line is , of which is located in Kazakhstan and the rest is located in Russia.
On 24 March 1977, the Central Committee of the Communist Party of the Soviet Union and the Council of Ministers of the Soviet Union took a decision to construct the Ekibastuz–Centre (Tambov) 1,500 kV direct current line. This line was put under construction but never finished. In 1998, the Siberia–Urals line was extended from Barnaul to Itatsk.
Sites
{| class="wikitable sortable"
! Name || Coordinates
|-
| Chelyabinsk ||
|-
| Kostanay||
|-
| Kokshetau ||
|-
| Ekibastuz ||
|-
| Barnaul ||
|-
| Sharypovo ||
|}
References
Bibliography
- Research Institute of Development Assistance (Japan), Regional cooperation in central Asia : focusing on infrastructure development, The Overseas Economic Cooperation Fund, Japan, Research Papers No. 27, July 1998 .