220 kV line Lehrte – Borken
The 220 kV line Lehrte – Borken is or was a high-voltage overhead line for two three-phase circuits with 220 kV operating voltage. It was built by PreussenElektra at the end of the 1920s , went into operation in 1931 and connected the Borken power plant with the Lehrte substation , one of the central nodes of the supply network at the time.
The section south of Sandershausen to Borken has already been dismantled, the remaining section from Lehrte to Sandershausen is now operated by Tennet TSO .
Design
The original masts carry two circuits in a Danube mast arrangement and an earth wire on the top of the mast . With their low overall height and the flat, but wide-spreading crossbars , they have a strangely compact appearance for current habits. The conductors are designed as single conductors.
The section from Sandershausen to Borken was dismantled at the end of the 1980s and the substation in Borken was converted to 380 kV. Most of the section from Lehrte to the Sandershausen substation near Kassel is still in operation in its original state, only individual masts have been replaced by more modern constructions during renovations.
course
The line begins at the Lehrte substation 2 km southeast of the Hanover-East motorway junction . It initially runs south, turns west at the level of the Hanover-Süd motorway triangle , crosses the A 7 there and reaches the Leine valley south of Laatzen , which is initially crossed on portal masts in a boggy area.
The line swings back south and generally follows the B 3 up the Leine valley west of the river, past Marienburg Castle and the town of Elze , and reaches the Godenau substation north of Alfeld .
From Godenau to the south, the route continues up the Leinetal, initially connecting the Erzhausen pumped storage power plant with a 5.2 km long branch line . From here the line leads directly south to Einbeck , the western parts of which it spans, and thus cuts a loop of the line through Kreiensen . The Ahlsburg and the town Moringen be bypassed to the east and the substation Hardegsen reached.
At Holtensen the A 7 is crossed again, to which the line then runs parallel for a few kilometers, past Göttingen. In this section is the Rosdorf substation, to which the line was subsequently connected with two new guy masts . To the south of the Göttingen-Ost service station, the line leaves the Leine valley and leads over the A 7 almost in a straight line to the southwest over a ridge. West of Hedemünden , the A 7 is first crossed again and then the steep and deep valley of the Werra is spanned a little above the railway and motorway Werra valley bridges with two large portal masts. The span is 430 m wide with a large slack and is also crossed by the parallel 110 kV traction power line on the high-speed line from Hanover to Würzburg .
The south-westerly direction will be maintained until the point north of Heiligenrode is reached at which the line originally continuing to Borken was subsequently connected to the Sandershausen substation after being dismantled . For this purpose, a 700 m long new line branching off at right angles was created from the last original pylon, on which the line crosses the A 7 for the fifth time directly in front of the substation.
The part of Lehrte – Sandershausen still existing in 2020 is 140 km long.
meaning
The line was planned as a busbar in the PreussenElektra transmission network to enable the exchange of energy between the Borken power plant and the Affoldern hydropower plant, which was completed in 1929, with the greater Hanover area. With the Lehrte substation , the network operator's most important node was created. The 176 km long line at the time was initially operated with a voltage of 100 kV for the time being.
Besides the north-south line to the west and the Empire busbar in the East this line was about the third north-south axis of the emerging German also high voltage - electricity grid thought. Therefore, when it was built, consideration was given to extending it later in the south to the Kelsterbach substation and in the north to Hamburg . This would have enabled a connection on the one hand to the north-south line of RWE and on the other hand to the network of Norwegian hydropower plants and thus overall more economical operation with demand-based exchange of electrical power. However, this expansion was not implemented.
After the Reichsammelschiene at the zone border (state border Thuringia / Bavaria) was dismantled by the Soviet Union as a reparation in the course of the division of Germany , the rest of the Bavarian 220 kV network was cut off and thus isolated. In order to maintain the interconnected operation of PreussenElektra with the Bavarian high-voltage network, the 220 kV line Ludersheim – Aschaffenburg – Borken was built until 1949 and connected to the Lehrte – Borken line. A connection to Kelsterbach was established via Aschaffenburg, which also connected RWE .
Dismantling
The dismantling of the line between Godenau and Sandershausen in favor of the new 380 kV Wahle – Mecklar line, to which the Erzhausen pumped storage plant will also be connected, is planned for 2021. It should begin after the Wahle-Mecklar replacement line has gone into operation. The southernmost section from Sandershausen to Borken has already been replaced by a new 380 kV line. The line between Lehrte and Godenau will continue to exist.
gallery
Characteristic mast picture of the first generation of the original line, here near Göttingen.
Second generation mast near Hanover, these masts are a bit more robust.
Detail of the conductor suspension.
The line next to the A 7 near Göttingen. In the center of the picture and behind them to the left there are still original masts, the others are newer constructions.
Renewed mast near Göttingen, based on the original picture.
Portal mast of the Werra valley crossing (north side), a dirt road leads between the legs. Behind a mast of the crossing traction power line.
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Individual evidence
- ↑ Hans Witte: The concentration in the German electricity industry . Dissertation, Springer-Verlag Berlin Heidelberg 1932, p. 17
- ^ H. Kirchhoff: Company form and sales policy of the power supply . Published by Julius Springer, Berlin 1933, p. 88
- ↑ Network expansion in Lower Saxony is progressing: TenneT starts building the important north-south connection between Wahle and Mecklar . Press release from Tennet. Retrieved March 29, 2018.
