Gösgen power plant

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Gösgen power plant
(plant renewed in 2000)
The power plant in 1947
The power plant in 1947
location
Gösgen power plant (plant renewed in 2000) (Canton of Solothurn)
Gösgen power plant (plant renewed in 2000)
Coordinates 640849  /  246592
country SwitzerlandSwitzerland Switzerland
Canton of SolothurnCanton of Solothurn Solothurn AargauKanton AargauKanton Aargau 
place Niedergösgen (headquarters location)
Waters Aare
Height upstream 391  m above sea level M.
power plant
owner Alpiq Holding
construction time 1913-1917
Start of operation 1917, renewed in 2000
Listed since Yes
technology
Bottleneck performance 49 megawatts
Average
height of fall 		15.7 m
Expansion flow 380 m³ / s
Standard work capacity 303 million kWh / year
Turbines 5 Kaplan turbines
Generators 4  three-phase current  50 Hz 1  traction current  16.7 Hz
Others
Website alpiq.com
was standing 2020

The Gösgen power station , formerly the Olten-Gösgen electricity station , is a run-of-river power station owned by Alpiq on the Aare in Switzerland that uses the river between Aarburg and Schönenwerd . The power plant's machine house is in Niedergösgen . The plant, which was commissioned in 1917, was the largest run-of-river power plant in Switzerland at the time. It was renewed in 2000.

location

The Gösgen power plant is shown on the Dufour map . Data status 1928

The power plant is located as a diversion plant on a four-kilometer-long works canal. The weir above Winznau causes a 6.3 km long damming that extends to the Aare bridge in Aarburg . Irrespective of the flow of the Aare, the stagnation level is constant at 391.3  m above sea level. M. held. From the bridge to the Klos above Olten, the border between the cantons of Solothurn and Aargau runs in the middle of the river, the rest of the power plant is on Solothurn soil, which is why the canton of Solothurn has a sovereign share of 93% and that of the canton of Aargau 7%. The machine house is located in Niedergösgen in the Mühledorf district. The water is returned 400 m above the Schönenwerd bridge. The entire stretch of the river used for energy generation is 14.8 km.

history

First power plant

Technical data old system
(up to 2000)
Bottleneck performance 40.5 megawatts
Average
height of fall 		15.7 m
Expansion flow 380 m³ / s
Standard work capacity 286 million kWh / year
Turbines 7 Francis turbines 7.4 MW 1  Kaplan turbine 8 MW
Generators 7  three-phase current  50 Hz 1  traction current  16 2 ⁄ 3  Hz
Others
was standing 1973

The power plant was built during the First World War and commissioned by Elektrizitätswerk Olten-Aarburg AG (EWOA) in 1917 . In the beginning there were six Francis turbines with spiral housings from Escher Wyss & Cie. set up, of which four were needed in operation. Two turbines were kept in reserve, two more turbine pits were still unused when operations began. Each turbine could deliver an output of 6500 to 1000 hp. The salient pole generators from Brown, Boveri & Cie. (BBC) generated three-phase alternating current with a frequency of 50 Hz. The generation of 40 Hz two-phase alternating current was planned at the beginning, for which two machine sets that could be switched between 40 Hz and 50 Hz were provided, but the EWOA network was still being used during the construction of the Gösgens power station changed to 50 Hz. The speed of the two switchable machine sets was 93.6 revolutions per minute in 50 Hz operation , the other 83.3. The generator terminal voltage was 8 kV.

Purchase contracts with other distribution networks existed right from the start. For example, 11 MW were transferred to the distribution network of the Ronchamp coal mines , which operated a thermal power plant that supplied the region around Belfort and Nancy with electricity. Furthermore, the service was given to the Lonza in Waldshut .

In 1923 the seventh Francis turbine was installed, in 1950 a Kaplan turbine was installed in the eighth and last turbine pit to generate traction current with a frequency of 16 2 ⁄ 3 Hz , which was renewed in 1990.

  • Old power plant

  • Cross section through the turbine house

  • Machine room around 1920

  • Generator runner during assembly ( BBC )

  • Francis turbine ( Escher Wyss & Cie. )

Renewal in the 1990s

In the 1990s, a concept was worked out how the power plant could be renewed and the output increased. Instead of the eight Francis turbines, five Kaplan turbines were installed. The water flow was improved by adding adapted suction pipes to the turbines and narrowing the headwater channel to the cross section used. The machine house was demolished for the conversion and then rebuilt in the same cubature.

The amount of water used and the water level of the overflow were not changed by the modernization of the system. The renovation cost about 200 million SFr. and increased the annual production from 286 million kWh to 303 million kWh . The last turbine in the old power plant was switched off in November 1999, and after a five-year renovation, the power plant was put back into operation in 2000. In 1962, a bulb turbine with an output of 240 kW was installed at the weir system in Winznau , which turbines the residual water released into the Aare bed.

Re-licensing

The existing concession expires in 2027. In connection with the renewal of the license, some adjustments to the systems are necessary. The amount of water to be added is to be increased so that annual production falls to 300 million kWh, while various ecological compensation measures are being implemented. The gates of the 90-year-old weir system are being renewed, the weir superstructure, which is no longer earthquake-proof , is being demolished. The doping power plant at the weir will be replaced. The new system will be equipped with a vertical Kaplan turbine and will no longer be integrated into the weir.

See also

Web links

Commons : Kraftwerk Gösgen  - Collection of images, videos and audio files

literature

  • Adolf Merz: 50 years of the Gösgen power plant: a historical review . 1967, doi : 10.5169 / SEALS-659271 .
  • AG Motor: The hydroelectric power plant "Gösgen" on the Aare of A.-G. "Olten-Aarburg electricity works" . In: Schweizerische Bauzeitung (SBZ) . tape 75 , 1920.

Individual evidence

  1. ↑ a b c d e Heinz Lätt: A lot is being built for the power supply . In: Oltner Neujahrsblätter . 1996, doi : 10.5169 / SEALS-659626 .
  2. ↑ a b Gösgen . In: Statistics of hydropower plants in Switzerland . January 1, 2020 ( admin.ch ).
  3. ↑ a b c Statistics of hydropower plants in Switzerland . January 1, 1914, p. 170–171 ( admin.ch ).
  4. ↑ SBZ. Part 13. p. 250
  5. ↑ Gösgen . In: Statistics of hydropower plants in Switzerland . January 1, 1928, p. 184-185 ( admin.ch ).
  6. ↑ Andreas Meier: Atel: new power plant technologies in Gösgen and Ruppoldingen . 2001, doi : 10.5169 / SEALS-660071 .
  7. ↑ Alpiq (Ed.): Renewal of the Gösgen power plant concession . April 2012 ( so.ch [PDF]).