Finstertalspeicher
The power plant group Silz the Tyrolean Hydropower AG is a location of Innsbruck in Silz west plant from the group of pumped storage power plants for the production of peak load, which consists of the two reservoirs Finstertal and Längental as well as the power plants Kühtai and Silz. About streams into memory Längental transported water can be pumped in a power plant Kühtai in the higher memory Finstertal, making it gains altitude energy that can be harnessed to the main demand periods again by transferred water into the store first Längental and then through the rock massif lines is routed with a vertical drop of over 1250 meters in the power plant Silz where it drives turbines at high speed.
- 3.1 power plant Kühtai
- 3.2 power plant Silz
- 3.3 Data
History
With the increasing energy needs of Europe in the 1970s and the use of numerous nuclear power plants, the problem of storing the generated electric current to times of the day weaker demand came on, since those power plants are used to generate base-load and can not be shut down within a short time. Looking for a suitable location for a power plant that takes into account these aspects, the choice fell on the Inn Valley, as here follow on flat land along the Inn Alpine massifs with a significant height difference. In 1977 began the construction of the power plant group and the establishment of the dams, 1978 began the construction of Bach versions which conduct water from the catchment area into the memory Längental what could be started with the damming of the two reservoirs in late 1979. After a one year period of trial operation, the power plant group Silz by the position of the Talkraftwerkes in the field of Silz and the location of the catchment area, which is located mostly on the territory of the village of Sellrain, got her double name running since 1 October 1981 officially in full operation. When commissioning presented Silz the most powerful pumped storage power plant in Europe dar.
Reservoirs
Memory Finstertal
The reservoir Finstertal is located at an altitude of 2300 meters above sea level and has a capacity of 60 million m³. On its territory occupied before damming two smaller, naturally formed lakes that lay on a rocky basin, which has the required aptitude for taking such large amounts of water. For the embankment of the dam with a height of 149 meters and a crest length of 650 meters, 4.5 million m³ of rock were used, which came completely out of the area of today's reservoir. The dam is sealed by an inner core made of asphalt concrete. Since this method had not yet been realized for the construction point of such size, the engineers installed measuring devices 700, still check the behavior of the dam.
Memory Längental
The reservoir Längental, often referred to as temporary storage Längental, located 400 meters below the memory Finstertal and plays in the power plant group Silz a central role in the intermediate memory, the recording volume amounts to only one-twentieth of the memory Finstertal, open the stream versions of 13 mountain streams which supply the reservoir continuously with feed. The lake contained water can be initiated as necessary either pumped to the storage in the reservoir Finstertal or for generating energy to power plant Silz. The construction material for the 45 -meter-high dam was largely recovered by excavation of the tunnel system that connects the various parts of the power plant group together.
Power plants
Power plant Kühtai
The upper of the two power plants in the power plant group Silz situated at an altitude of 1900 meters above sea level on the southeastern shore of the memory Längental. Since a water extraction and imports to avoid cavitation must be made well below the lake level, the power plant Kühtai is designed as a shaft power plant, which means that the components are arranged vertically and the majority of the cylindrical power plant building is located underground. This has a diameter of 30 meters at a depth of 82 meters. Through the manhole construction, it is also possible to remove the rotor and stator by a gantry crane or incorporated. In the plant, two Francis turbines are installed, which can be used both as a pump and as generators, either to pump the water obtained from the catchment area into the memory Finstertal or recirculate precisely that water again to obtain electrical power. Both turbines can handle in pump operation per second, a quantity of water of 66m ², with which the memory Längental could theoretically be completely emptied in under 13 hours.
The generated electricity is passed through high-voltage lines to the valley and there fed either in the Austrian electricity grid or in the Central European grid. From the power station there Silz the power plant Kühtai is controlled and monitored, so that the power plant Kühtai staff do not necessarily have to be present.
Power plant Silz
The power plant Silz is the main stage of the power plant group Silz dar. It lies at the foot of the mountain at an altitude of 643 meters above the sea level. The technical components are also applied here underground, where the hall of the power station building only used for the maintenance of the two generators. In addition to the power plant is a factory building, where carried out to control all systems of the power plant group, and an outdoor switchyard to feed the electricity produced in power plant group into the power grid.
The water needed relates the power plant Silz from the reservoir Längental, from which a slightly inclined pressure tunnel branches off to follow a case, plug in which the water is brought with drop height of 1258 meters on his final velocity and then passed through an overflow into the Inn.
The power plant has two Silz Pelton Pelton turbines which convert the energy of the incident at 500 km / h water with a total capacity of 500 MW in electricity. The turbines are equipped with 23 cups, in the impinging jets of six water and produces a rotor speed of 500 revolutions per minute., Where high forces make a particularly strong foundation of reinforced concrete necessary, resting on gravel 15 meters from the Inn.