GKK Etzenricht
The dc short - coupling ( GKK ) Etzenricht was one of the former Bayern AG ( now TenneT TSO GmbH ) in 1970 taken from 1993 to 1995 on the site in operation and operated in the following period extended substation Etzenricht HVDC short coupling for coupling the German and the Czech electricity grid. She worked with a DC voltage of 160 kV and had a maximum transmission power of 600 megawatts.
Construction
The two converters in a 13-meter- high hall of 430 square meters of area, which was carried out in a mixed place and precast concrete construction, accommodated. Each converter 432 consists of thyristors that are placed in six arranged in a row Thyristortürmen. Each Thyristorturm includes two valve functions and is composed of eight stacked thyristor modules, the series-connected thyristors turn nine, including auxiliary equipment as necessary contain saturable reactors for current limiting. In parallel to each thyristor, a series connection of a resistor is connected to a capacitor which defines the current rise. From this circuit, the power supplied to the Thyristorelektronik is obtained, which, since it is under high voltage is connected to the control electronics at ground potential via fiber optic cable in bidirectional communication. Parallel with each thyristor a capacitor and parallel to each valve function, a varistor is connected. When the thyristor type U78 S346 S34 Siemens was used with a maximum continuous current limit with 4,100 amperes, which was at the time of construction of the plant is the most powerful thyristor in the world.
There are three bays to accommodate the, designed as a single-phase units, converter transformers at both ends of the hall.
History
On 26 April 1991 the foundation stone was laid. In September 1991 was the completion of the shell and in May 1992, the start of commissioning. This was until the completion of the line to Hradec on 3 September 1992 only in loop mode, that is, between the busbars of the substation Etzenricht be performed. On 27 January 1993, the commencement of trial operation followed. On 9 July 1993 was the official start-up. On 18 October 1995, the decommissioning after the sync circuit of the German and Czech electricity grid was carried out.
Due to the synchronous circuit, the value of on line Etzenricht - Hradec transferable capacity of 600 MW increased to 1316 MW. The only after the synchronous circuit on 29 July 1997 commissioned in second 380 kV circuit according Prestice brought again an additional transmission capacity of 1579 MW, so that today can be exchanged via the substation Etzenricht maximum of 2895 MW with the Czech Republic.
After 1997, most external components were dismantled and stored on the station premises, the system was not functional until 2009 and will not operate on the premises. Only the transformers, the smoothing reactors and a filter circuit remained in its original location. Since the decommissioning of the plant it's sale was scheduled to Eastern Europe, to allow an exchange of energy between the eastern power grid and the electricity grid of the CIS countries. Since the current judges increasingly outdated and because you now a converter system as the GKK Etzenricht can realize a lot easier with the help of Fotothyristoren, never came a corresponding trade. 2006, the plant was sold to the company IDPC in Vienna, which was originally marketed completely and later in individual parts. However, very few components could be sold. In spring 2009, all, as any remaining components of the GKK Etzenricht were dismantled and scrapped. In the former converter hall a large door was installed.
View of the system, the right of the mast on the day the line runs to the Czech Republic, left of the inverter hall, left the only remaining filter circuit
Converter Hall of GKK Etzenricht. The transformer bays have been removed.
View the converter hall
The only remaining filter circuit GKK Etzenricht
Smoothing reactors of the former GKK
Wall of the converter hall, where once stood the smoothing reactors. The door was installed later.
The transformer bays on the other side of the inverter hall were stripped
High-voltage line to the Czech Republic
The to the substations Hradec and Prestice leading from the GKK Etzenricht to the Czech Republic 380 kV line was built in 1992, is to protect against surges along its entire length with two ground wires, one of which contains an air cable in fiber optic technology to transmit messages, equipped. It has until the road forks at Straz two circuits for a voltage of 380 kV with a maximum transmission power of 1639 MW. As conductors of four bundles of aluminum / steel conductor cables are used on the German side, the aluminum cross section of each single conductor 340 mm ² and the steel cross-section: 30 mm ². Between pastures and Etzenricht it is laid on 14 Danube masts with Erdseiltraverse. With the exception of the first mast, which was built after the closure of the GKK to jump the line - at the converter hall of the former GKK past - introduce into the switchgear of the substation Etzenricht, thus increasing the length of the German line portion 180 yards on 33 8 km enlarged wore these masts to 1992, the 110- kV line to the substation pastures. This line was moved in 1992 to new masts parallel to the 380 kV line to the Czech Republic. During the installation of the 380 kV circuits the masts of the former 110- kV line from Etzenricht to Weiden also received the Erdseiltraverse. Immediately behind the substation pastures, which crosses the line, the line is shifted to 60 poles with a fourth crossbar for receiving the two circuits of 110 kV line Weiden - Vohenstrauß and the 30 kV line Vohenstrauß - Eslarn. This measure was necessary because, for environmental reasons, only one pipeline route could be approved so that the circuits of those existing already before 1992 lines had to be placed on the masts of the lead after the Czech Republic.
In Vohenstrauß branch the 110 kV circuits to the local substation, which is located directly on the pipeline route, from. Behind Vohenstrauß are located at the lowest traverse the circuits of 30 kV line Vohenstrauß - Eslarn, the insulators were already dimensioned for later conversion to 110 kV. Near Riedlhof this line branches off from the leading to the Czech Republic 380 kV line road and walk on concrete poles to substation Eslarn. The 380 kV line runs from there to 15 Danube masts for German -Czech border, which is just north of the border crossing of the A6 motorway at Waidhaus crossed. Not the mast picture, but the mast design and type of conductors used changes at the border. Arrived in Germany four bundles are used, they are used in the Czech Republic three bundles where each conductor has a cross section of 450 mm ² 50 mm ² aluminum and steel. After a further 31.5 kilometers, this line splits in the Nähe49.68008333333312.784583333333 of Straz in two single-circuit 380 kV lines on, in the 1992 -built 97.5 -kilometer line section to the North Bohemian Hradec and in 1997 erected line section after Prestice. Both lines are laid on Delta masts. It is noteworthy that the last section of the line Etzenricht - Hradec is running on the site of the substation Hradec between the credits portal and the busbar underground cables.
Branch mast Vohenstrauß
Feeding the 30 kV line Vohenstrauß - Eslarn the lowest Travers
The line crosses the Bavarian- Czech border at Waidhaus. The mast in the foreground is in Bavaria, the masts in the background are in the Czech Republic
Distribution of lead at Straz in the strands to Hradec (left) and Přeštice (right)
Richtfunkturm
South of the station area on a Hügel49.62444444444412.115277777778 is since 1973 a 55 -meter-high radio tower, which is embodied as a freestanding steel framework construction. It is used for the transmission of values and operating remote control commands to the regularly unoccupied substation Etzenricht (also for operating the GKK Etzenricht was not the regular presence of personnel necessary) remote control.