The energy Ministry called the cause of significant disruption to power grids in Siberia

© Fotolia / ѕеап824Линии power. Archival photoThe energy Ministry called the cause of significant disruption to power grids in Siberia© Fotolia / sean824

Large-scale power outages in Siberia on Tuesday occurred due to improper operation of an emergency control system for Bratsk hydroelectric power station «Irkutskenergo» and subsequent errors in automation one of the substations, the message of the Ministry of energy.

Earlier Tuesday, the situational and analytical center of the Ministry of energy reported that in Siberia at 11: 43 MSK began to power outages. Passed out seven power units of the Boguchanskaya HPP, there was a full load dump stations from 2025 MW to zero without loss of their own needs. Also disconnected the second power unit of Berezovskaya GRES with the capacity of 800 MW, has been shut down load at three aluminium smelters of RUSAL — Bratsk, Irkutsk and Krasnoyarsk and the Irkutsk aviation plant at 2590 MW. There have also been outages in power grids «MES Siberia and MES of Western Siberia» (the branches of FGC UES).

The outage occurred at three power plants: Nazarovskaya GRES (reducing load by 300 MW), the Krasnoyarsk hydroelectric power station (reducing the burden on 1320 MW) and Ust-Ilimsk hydroelectric power station (reducing the load on 1060 MW). Without electricity remained part of the household consumers in the Krasnoyarsk region, the Kemerovo region, Zabaikalsky Krai and the Republic of Buryatia — circa 265,2 thousands of people. At 15.08 GMT electricity was restored to consumers in full.

«At 11.43 on Brotherly hydroelectric power station emergency automation devices incorrectly formed and implemented the power of the Irkutsk power supply system control of load shedding in the amount of about 800 MW, including the Irkutsk aluminium smelter and 750 MW. After work emergency control Bratsk hydroelectric power station … (and by having ed.), the excess of parameters of electric mode of the integrated power system of Siberia additionally worked wrong device for emergency control for the 500 kV lake with the action to shut off the load at the Bratsk aluminium plant in the amount of about 650 MW. The result of the consistent malfunctioning of the emergency control device for the Bratsk hydroelectric power station and 500 kV Ozernaya was the cascade development of the accident», — reported the Ministry of energy.