Ranna pumped storage power plant
| Ranna pumped storage power plant | ||
|---|---|---|
 |
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| location | ||
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| Coordinates | 48 ° 29 '25 " N , 13 ° 45' 3" E | |
| country |
 Austria
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| Waters | Danube , Rannatal reservoir | |
| power plant | ||
| owner | Energy AG | |
| Start of operation | 1925 | |
| technology | ||
| Bottleneck performance | 19 megawatts | |
| Average height of fall |
Francis turbines: 202 m Pelton turbine: 170 m Kaplan turbine: 10 m |
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| Expansion flow | 12 m³ / s | |
| Standard work capacity | 47.7 million kWh / year | |
| Turbines | 3 Francis turbines , 1 Kaplan turbine , 1 Pelton turbine | |
| Generators | 3 synchronous generators, 1 synchronous motor generator, 1 asynchronous generator | |
| Others | ||
The Ranna pumped storage power plant is a pumped storage power plant on the Ranna River in Upper Austria and is located directly on the Danube . It uses the dammed Ranna River, which flows into the Danube not far from the power station. When it went into operation in 1925, it was one of the oldest power plants in the Mühlviertel .
As a pumped storage power plant, it is capable of in off-peak periods to pump water from the river Danube in the higher Rannatalspeicher which if necessary to peak load periods drives in the reverse direction of the turbines, and thus generates electric power.
history
Between 1923 and 1925, the Stern & Hafferl company built a power plant with a simple weir to contain the Ranna. The total bottleneck capacity at that time was 5.8 MW.
From 1947 to 1954, the Oberösterreichische Kraftwerke AG (today Energie AG Oberösterreich ) carried out extensive expansion . The Rannatalsperre was built and the existing power plant expanded into a pumped storage power plant. The power plant output was almost tripled.
On February 1, 1962, the water tunnel above the power plant broke, and around 10,000 m³ of water fell down the slope. The result was mudslides and damage to a neighboring farm. Since the pressure tunnel had to be repaired again, there was a prolonged outage of power generation. There was only minor property damage to the power plant building itself.
The reservoir had to be completely emptied at the end of August 2004 due to necessary maintenance work on the technical facilities of the dam. A scheduled temporary relocation of the fish population took place. As part of the revision, a new closure flap was installed in the bottom outlet, and the dam and the water tunnel were checked.
Until the beginning of 2012, the power station served as one of four regional control centers from which the Partenstein power station was also controlled. Today the Ranna power plant, like all hydropower plants operated by Energie AG, is controlled from the "hydropower control center" in Gmunden .
Rannatalsperre
The Rannatalsperre was built during the expansion of the power station in the narrowly cut valley of the Ranna in order to be able to collect the pumped water from the Danube. It is a weight-arched wall 45 m high and 125 m long, which also serves as a single-lane bridge for road traffic between the communities of Neustift and Pfarrkirchen . The top of the wall has eight fields for flood relief in the old bed of the Ranna. There is a bottom outlet at the deepest point of the dam .
The elongated Rannastausee extends south of the town of Oberkappel over a length of about 3.5 km and has a storage volume of 2.35 million m³. The Höllbach, a tributary of the Ranna on the left bank, is also fed back into the reservoir via a slope pipe. This is about 1 km long and flows into the lake on the east side of the dam. Due to the pumped storage operation, the water level fluctuates by up to 20 m.
The Rannastausee is known to anglers for its diversity of over 30 species of fish. Thanks to the pumped storage operation, Danube fish also get into the reservoir. The fishing water is divided between Energie AG on the left bank and Gasthof Süss on the right bank.
Several hiking trails lead around the lake, through the Rannatal nature reserve below the dam, and along the Höllbach line. The Konzingersteg also allows you to cross the reservoir at about half its length.
Water tunnels and penstocks
From the intake structure on the western shore of the reservoir, where the water inlet is preceded by yet a fine screen including cleaning system, as well as a butterfly valve, a 3.6 km long underground pressure tunnel leads with 2.0 m diameter to the surge tank above the power station.
From there, two parallel steel pressure pipelines run down the slope of the Danube valley to the power station building.
The first line with a diameter of 1.2 m and a length of 381 m is riveted and dates back to 1925. It carries the process water to the two older turbines.
The second line with a diameter of 1.6 m and a length of 409 m is welded and was put into operation when the power plant was expanded. It leads the process water to the third turbine or the pump water from the storage pump in the direction of the reservoir.
Power plant buildings and machine sets
The power station building is located on the Danube in the district of Kramesau, 2.5 km above the Ranna confluence with the Danube.
- Machine set I and II: The two older twin Francis spiral turbines , each 3950 kW, each drive a three-phase synchronous generator. They are from 1925.
- Machine set III: A Francis spiral turbine with an output of 13,174 kW and a three-phase synchronous generator . In the pumping mode, this generator drives the adjacent storage pump as a motor, which pumps 6000 liters of water per second over a height of 190 m back up into the reservoir.
- Machine set IV: A Kaplan turbine with an output of 900 kW and a three-phase synchronous generator serves as a back-up system and uses the remaining head to the Danube.
- Cooling water unit: A Pelton turbine with 20 kW output and a three-phase asynchronous generator .
In addition, the feeder pump is installed in a separate building directly on the Danube, which pumps the Danube water to the storage pump.
Substation and grid connection
The power station's substation is an important power supply hub. In addition to the 110 kV high voltage network , the power plant is also connected to the regional 30 kV medium voltage network. The open-air switchgear is located to the east of the power plant building . From here, perform three 110 kV lines to the power plant Partenstein , the transformer station in Rohrbach , as well as Passau to the local substation and power plant Kachlet .
Web links
Individual evidence
- ↑ http://members.aon.at/hofkirchnerzeitgeschichte/1962.htm ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ Chronicle of the FF Oberkappel. (PDF; 1.5 MB) Retrieved September 5, 2013 .
- ↑ Energy AG Press Release: home sweep Rannafische , Walter Czetsch, Linz 29 April, 2005
- ↑ Ranna fish find a new home. Retrieved September 5, 2013 .
- ↑ Central command post for the control of all hydropower plants in Gmunden. (No longer available online.) Energie AG Upper Austria, January 4, 2012, archived from the original on November 12, 2013 ; Retrieved September 5, 2013 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Technology in the Ranna power plant. (PDF; 459 kB) Energie AG Oberösterreich, June 2005, accessed on September 5, 2013 .
- ↑ Angling and fishing in the Ranna reservoir & river section. Association for the Promotion of Angelsportes eV, accessed on September 5, 2013 .
- ↑ Fishing - Gasthof Süss Oberkappel. Gasthof Johannes Süss, accessed on September 5, 2013 .
- ↑ Fischwasser Ranna and Rannastausee. Upper Austria Tourism, accessed on September 5, 2013 .
