Siberian geophysics developed equipment and the method of processing seismic records that monitors vibration generating units and other parts of the power plant, which should prevent the coincidence emitted by hydraulic vibration frequencies with the natural frequencies of structures and avoid accidents in the future, according to RIA Novosti director of the Geophysical Service (TOS) of CO RAS Victor Seleznev.
According to the scientist, the staff of the Geophysical Service RAS measured how the vibration of the second hydroelectric SSHGES over the last year, the month and the day before the accident. They came to the conclusion that his failure was gradual, and the reason was the PE match the natural frequency of vibration of the turbine cover with the one that created the hydraulic unit.
"Each unit HPP during emits vibrations of different frequencies, which can vary in amplitude, and thus there is a danger of the frequency of the units with their own vibrations of other parts of the dam. Important to prevent such a coincidence, because the load on the details of the resonance can amplify hundreds of times "- said Seleznev.
According to the source, the researchers plan to use a hundred sensors in different parts of the Sayano-Shushenskaya HPP and create an automated system that captures changes in the frequency of vibration and signals them before they become a real threat to the integrity of the equipment.
"Under the agreement with" RusHydro "we did spectrograms of seismic records at start of each of the units Sayano and now, with this data, we can control their changes, as well as state of the entire dam," — said Seleznev.
Geophysicist said that, according to an analysis of records seismic "Beacon Hill", strong vibration on the second unit HPP began five minutes before the accident and it was a harbinger. If it had been SSHGES monitoring system that monitors the vibrations increased, it could prevent an emergency, taking the necessary measures, including shutdown of the unit.
According Selezneva, sensors mounted on hydraulic units do not provide information about the interaction of vibrating elements with their environment. "The vibrations must be measured not only in units, but also in dozens of meters away from them, and the recognition of processed signals must be configured to allow for changes in the spectrum can be measured reliably moments gain fluctuations associated with the resonant excitation," — said the scientist.
Director of Technical Policy of JSC "RusHydro" Rasim Khaziakhmetov on scientific and technical council of the company on Tuesday stressed the need to develop a system for automatic monitoring SSHGES and said that development work on the installation and configuration of the system, together with experts "RusHydro" and the station , employees of GS SB RAS begin next year.
The accident at the country's largest hydropower station — SSHGES owned JSC "RusHydro", took place August 17, 2009. HPS has been stopped, killed 75 people. Now there is a recovery station. Russian Energy Ministry on the plan, hydropower should be fully restored by 2014.