Alstom delivers "world first" hydropower safety system

Tianjin Alstom Hydro has successfully delivered the world’s first self-closing electronic ring gate control system to the Ahai hydropower station in China, representing a major technical advance for the safety of the dam
In a statement, the French company said that the system supplied is a unique innovation that boasts the world’s first electronic ring gate control system with hydraulic synchronization – meaning that in an emergency, the system can close by itself, cutting the flow of water to stop the turbine.
The system is extremely reliable, offering easy operation and maintenance, high precision and outstanding safety compared with traditional ring gate systems. The process of model and product development, design, manufacture, assembly and testing took just 8.5 months and is the result of effective collaboration between Tianjin Alstom Hydro and the Alstom research and development centre in Grenoble, France.
The Ahai dam, owned by Yunnan Jinsha River Hydropower Co. Ltd, is currently under construction and comprises 5 × 400 MW Francis hydro turbine generator units, for which the five turbines are being supplied by Alstom under a contract worth EUR89m ($126m). The first unit will be commissioned in spring 2012.
With a diameter of 10 metres, a height of 2.6 metres and weighing 110 tonnes, the Ahai ring gate is the biggest one in the world.

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