Lehrte-Ahlten substation
| Lehrte substation | ||
|---|---|---|
.jpg) Substation, in the foreground a 110 kV line built around 1930, in the background several 220 kV pylons |
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| Data | ||
| place | Taught - Ahlten | |
| Client | Prussia Electric | |
| Construction year | 1920s | |
| Coordinates | 52 ° 22 '46.8 " N , 9 ° 55' 2.4" E | |
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The Lehrte-Ahlten substation is a large substation in the Lehrte district of Ahlten , east of Hanover . It was built by PreußenElektra in the early 1920s as one of the first systems in the 220 kV network and is now owned by the transmission network operator TenneT TSO . It is still an important hub in the German network; The operations center and one of the network operator's two switching lines for the northwest German power grid are located on the site .
history
The substation was built in the 1920s as part of the construction of the German 220 kV network. This was mainly driven by the two power supply companies RWE and PreußenElektra. Numerous coal-fired power plants in the Rhenish-Westphalian area and hydropower plants in the Alps and the low mountain ranges went into operation during this time. Due to the increasing generation of energy and the greater distances from the power plants to the large consumers, the step to operate the lines with a higher voltage had become necessary.
A 220 kV basic network planned as early as the early 1920s was to consist of several north-south routes and a cross-connection between the coal regions in the Rhineland, Westphalia and central Germany. The Lehrte substation was intended to be the intersection of these two axes. The north-south axis was supposed to transport the energy of the Norwegian hydropower plants coming from Hamburg and be connected to the north-south line of the RWE near Frankfurt am Main in the south .
Between 1929 and 1932 the Waldeck pumped storage power plant was built on the Edersee in Hesse . The Borken power plant , which went into operation in 1923 and is located just a few kilometers to the east, was also expanded due to the increased demand for energy. So far, the supraregional power grid in the PreußenElektra concession area, i.e. southern Lower Saxony, large parts of Hesse and the east of North Rhine-Westphalia , has mainly been operated by 60 kV lines. Since this voltage level was no longer sufficient, a 176 km long 220 kV line was built from Edersee via the switchgear of the Borken power station to Lehrte in 1929 . The northern and southern extensions were no longer tackled.
Between the Gersteinwerk in Hamm and the substation Peter Hagen - Bierde the built VEW in 1930 a 220 kV line, which continued from there to the substation Lehrte. This created a direct 220 kV connection between PreußenElektra and RWE for the first time.
The Harbke power station was connected to Lehrte in 1935 by a 220 kV line. The line connection from Lehrte via the Central German lignite mining area to Austria , which was planned as early as 1930 and which was to connect the hydropower plants in the Alpine region, was carried out during the National Socialist era by the then empire-owned electrical works from 1939 to 1941. It runs on masts of identical construction as the Lehrte – Harbke line.
Another 220 kV line from the pre-war period runs from Lehrte to Hallendorf near Braunschweig on masts of the same construction as the line to Borken. This line was to be converted to high-voltage direct current during the war (see below).
HVDC test facility
In 1944, an 80 kV high-voltage direct current transmission line was set up between the substation and Misburg . It served as a test object to improve the reserve power balance between two three-phase networks without increasing the short-circuit power. In addition, the Nazi regime was interested in detaining the electricity supply through underground power distribution. The system had an output of 16 MW at 80 kV and a five-kilometer cable route. Another transfer from Lehrte to Hallendorf with 150 MW and 300 kV was planned.
In contrast to other HVDC lines in which mercury vapor , hot cathode valves or semiconductors were used to direct the current, this system used electric arc converters according to E. Marx . These are based on erasable spark gaps , the extinguishing principle of which is based on blowing compressed air using special nozzle arrangements. The plant never reached the projected 16 MW output, but rather a maximum of 12 MW, but could be operated for several days in a row. This made it the world's first grid-connected HVDC system, with a significant transmission capacity in temporary continuous operation based on converters . The facility was destroyed by a bombing raid on Misburg on June 18, 1944 during World War II.
today
The system is still in operation today with 110 and 220 kV and is an important hub in the Hanover region . The Mehrum and Landesbergen power plants and the city of Hanover are connected to the substation via several 220 kV lines . The 220 kV lines to Braunschweig and Borken also still exist and run on the original masts from the 1920s. The line to Bierde was dismantled many years ago. The line to Harbke ends today at Salzgitter.
Connected connections
All circuits leading away from the substation are designed as overhead lines . The following connections exist or have existed:
| Network operator | tension | Power circle -No. |
Destination / station | Construction year | Dismantling | Cardinal direction |
Remarks |
|---|---|---|---|---|---|---|---|
 TenneT TSO |
220 kV | 2001 | Borken power plant | 1929 | partly replaced by 380 kV circuits | south | Originally passed to the west of Höver and Bemerode , these masts were then used for the line to the Gersteinwerk and new ones were erected east of Höver. See also the main article on the 220 kV line Lehrte – Borken . |
| Gersteinwerk | 1930 | Around 2005 | |||||
| 2024 | Braunschweig via UW Wahle near Vechelde | 1930 | Both systems are interconnected to form a circuit | ||||
| 2026 | Mehrum power plant | 1935 | Masts identical in construction to the Reich busbar , formerly to the Harbke power station | ||||
| 2008 | Landesbergen power plant | 1962 | North | One circuit operated at 110 kV | |||
| 110 kV | 1075 | Uelzen | 1930 | east | |||
| 1019 | Taught | 1960s | |||||
| 1164 | Hanover-West | 1950 | south | ||||
| 1011 | Sighted | 1967 | |||||
| 1016 | Hanover North | 1960s | west | ||||
| 55 kV | Misburg | before 1929 | Around 2005 | south | Formerly to Kassel | ||
| Oldau barrage | Around 2005 | east | From the beginning of 2000 initially only to Burgdorf | ||||
| 80 kV HVDC | Misburg | 1944 | After 1945 | west |
Individual evidence
- ↑ TenneT TSO GmbH company brochure. (PDF; 1.8 MB) Retrieved November 10, 2016 .
- ^ H. Kirchhoff: Company form and sales policy of the power supply . Published by Julius Springer, Berlin 1933, p. 88
- ^ A b Hans Witte: The concentration in the German electricity industry . Dissertation, Springer-Verlag, Berlin Heidelberg 1932, p. 17
- ↑ William dancers: steel poles for overhead power lines: Calculation and examples . Springer-Verlag Berlin Göttingen Heidelberg 1952, p. 22
- ↑ Dietrich Oeding, Bernd R. Oswald: Electrical power plants and networks . Springer-Verlag, Berlin Heidelberg 1978, p. 886
- ↑ Manfred Beyer, Wolfram Boeck, Klaus Möller, Walter Zaengl: High voltage technology: Theoretical and practical basics . Springer-Verlag, Berlin Heidelberg 1986, p. 3
- ↑ a b Dieter Kind: Erwin Marx and his contribution to the development of high-voltage direct current transmission from 1930 to 1945 , Braunschweig 2013, urn: nbn: de: gbv: 084-13041515485
- ^ Karl Baudisch: Energy transfer with high direct current, high voltage . Springer-Verlag, Berlin Heidelberg 1950, p. 292 ff.
