525kV technology for Germany’s “power highways”

04.12.2019

SuedLink, SuedOstLink and A-Nord are large-scale DC connection projects that are essential for Germany’s low-carbon energy future, since these so-called “Stromautobahnen” (power highways) will transport green electricity generated in the north and east of the country to the consumption centres in the south and west. The three power lines will be implemented predominantly via underground cabling and are collaborative efforts of the four German transmission system operators (TSOs). TenneT and TransnetBW cooperate on SuedLink, 50Hertz and TenneT join forces on SuedOstLink and A-Nord is carried out by Amprion. Together with Ultranet, a joint project with TransnetBW, A-Nord forms the Korridor A.

The four TSCNET shareholders intend to install innovative plastic-insulated DC cables with a voltage level of 525kV in these projects. So far, 320kV cables have been used for comparable DC connections in Germany. As a matter of fact, it will be the first use of 525kV underground cables worldwide, which underlines the pilot character of the three high-performance connections. The decision by the TSOs was preceded by an extensive test phase on the technical suitability of the 525kV cables. The pre-qualification tests according to international standards of the Council on Large Electric Systems (CIGRE) were successful and proved that the 525kV cables are reliable and safe.

A higher voltage level of the cables translates into more transmission capacity. This has two possible effects for the planned DC lines, assuming technical feasibility for the entire system: On the one hand, more electricity can be transmitted in a certain corridor with the same number of cables. On the other hand, fewer cables are required to transmit the same power compared to 320kV cable systems. This allows the routing to be designed narrower, which reduces excavation work and environmental impact.

The four German TSOs opt for innovative 525kV solution for power highways with underground cabling (picture: TenneT)

Linkup
> See 50Hertz press release, in German (html)
> See Amprion press release, in German (html)
> See TransnetBW press release, in German (html)

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New 50Hertz CEO takes up duties

03.12.2019

On 1 December, Stefan Kapferer took office as the new chairman of the executive board of TSCNET shareholder 50Hertz, one of the four German transmission system operators (TSOs). Until the end of October 2019, Kapferer headed the German Energy and Water Association (Bundesverband der Energie- und Wasserwirtschaft – BDEW). Kapferer succeeds interim CEO Dr. Frank Golletz, CTO of 50Hertz, who took over the additional duties after former CEO Boris Schucht had left the company in March 2019.

At a purpose-arranged press conference on 3 December in the German capital Berlin, Stefan Kapferer acknowledged the appeal and diversity of his new task. “The next phase of the realisation of the energy transition is an even greater challenge in terms of entrepreneurship and the European side of things. TSOs play an essential role here,” explained Kapferer. The main issues to be dealt with by 50Hertz are the German coal phase-out, following the current nuclear phase-out, the national legislative climate specifications and the grid extension which is essential for all these measures. For a Baltic Sea riparian TSO, it is particularly important to set the right course for the development of offshore wind energy.

Chris Peeters, head of the 50Hertz supervisory board, highlighted Kapferer’s wealth of political and international experience as former German State Secretary and Deputy Secretary General of the OECD and concluded: “I am convinced that Kapferer’s skills combined with the technical know-how of our staff will result in a great future for 50Hertz. Together we work for our goal: a successful energy transition.”

Stefan Kapferer is in office as new CEO of 50Hertz (picture: 50Hertz / Jan Pauls)

Linkup
> See 50Hertz press release (html)

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Swift progress for new 50Hertz overhead line

29.11.2019

This May, TSCNET shareholder 50Hertz, one of the four German transmission system operators (TSOs), started the construction of the first section of the 380kV Perleberg-Wolmirstedt overhead line. The new line will connect the Perleberg substation in Brandenburg with the Wolmirstedt substation in Saxony-Anhalt over a distance of 106km and replace the existing 220kV line from the 1950s. This grid extension is intended to ensure that the increasing quantities of regionally generated electricity from renewable sources are also available to consumers in southern and western Germany.

The first construction phase with 87 pylons and a length of 37km stretches between the substations Stendal West and Wolmirstedt. Construction work is progressing rapidly. More than half of the pylons have now been erected and some masts have already been fitted with power cables. Construction should be completed by mid-March next year.

50Hertz has already erected 48 pylons of the Perleberg-Wolmirstedt overhead line (picture of the substation Wolmirstedt: Otto-von-Guericke-Universität Magdeburg)

Linkup
> See 50Hertz press release, in German (html)

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Reaching the goal quickly with calculated risk

22.11.2019

Anyone who knows the Munich premises of TSCNET Services has probably also seen the photo wall with private photos of almost all employees. When the answer to the question “Do you have a photo for our wall, too?” is “Yes, but only one with me hanging head over feet out of a helicopter in the clouds”, you might think of a joke, but with him it’s none: Péter Szőcs, the new Data Center Support Specialist at TSCNET, not only has special professional skills, but also quite special hobbies. A native of Romania with Hungarian and German roots, he likes it fast and used to be an extremely successful professional motorcycle racer competing against the world’s best. Today he rather wants to go high and enjoy free fall as a skydiver. Here, too, he has an impressive international network and is well known on the scene.

For him, his personal and professional motivation is described by the fact that if he stands two and a half miles above the ground in an open aircraft door and can take a step into the empty space himself, then he could do anything. How can this be understood? Well, there is a saying circulating in the skydiving community that hints at the special magic of this sport: “For those who jump, no explanation is necessary. For those who do not jump, no explanation is possible.”

High speed and an experienced handling of risks also benefit Péter at work. In addition to studying history and journalism, he holds a bachelor’s degree in mechatronics and computer science. He has worked as a senior IT technical consultant on unified communication and contact centre solutions, e.g. for BMW, and as the Head of IT/Networking of the Transylvania International Film Festival.

Today he sees himself as a motivated and versatile professional with many years of IT experience, who is always looking forward undertaking new and exciting challenges. Together with his colleagues from the IT Infrastructure Services team, he wants to integrate and implement solutions that help TSCNET employees become more efficient in their business operation to increase productivity. “I want to be an active part of something that has an impact beyond our lives, where the focus is outward and the mission is more than the bottom line,” explains Péter. If this happens at a proverbial breakneck speed and helps the company climb dizzying heights, the co-workers will be the last to object!

TSCNET Services welcomes Péter Szőcs

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First pylon of new East Bavarian Ring erected

16.11.2019

The Ostbayernring (East Bavarian Ring) is an existing power line operated by the Dutch-German transmission system operator (TSO) TenneT, that stretches about 185km from the Upper Franconian town of Redwitz via Mechlenreuth and Etzenricht to Schwandorf in the Upper Palatinate. After the shutdown of Northeast Bavarian nuclear and conventional power plants, the Ostbayernring primarily transports renewable energies. On several days of the year, more energy is generated by wind turbines and photovoltaic plants in the regions along the East Bavarian Ring than is needed locally. Due to the resulting increase in the amount of renewable energy fed into the grid, the East Bavarian Ring regularly reaches its capacity limits.

To ensure the security of supply and the reliability of the grid and to prevent grid failures for the entire region of Upper Franconia and Upper Palatinate, the transmission capacities of the East Bavarian Ring need to be significantly improved. A replacement construction for the East Bavarian Ring was therefore included in the German Federal Requirements Plan and the urgency of the project for the energy market was legally determined. The new line is being constructed along the existing route, extending the current 380/220kV systems to two 380kV systems.

In the course of the construction of the new East Bavarian Ring and the related grid reinforcement, the Redwitz, Mechlenreuth, Etzenricht and Schwandorf substations of the TSCNET shareholder are also being upgraded. Now the first pylon of the new Ostbayerring has been erected on the site of the Etzenricht substation. TenneT has captured the construction on film in order to give a well-founded impression of the erection process.

The first pylon of the new East Bavarian Ring of TenneT has been erected (picture: TenneT / screenshot taken from TenneT-video “TenneT Ostbayernring: Der Projektleiter stellt sich vor”, YouTube)

Linkup
> See TenneT tweet, in German (html)
> Watch video of the pylon construction (YouTube)

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GIS with Clean Air technology for Daxlanden

14.11.2019

In present-day gas-insulated high-voltage systems, sulfur hexafluoride (SF6) is commonly used as insulating gas. It has excellent electrical and chemical properties, but also a strong greenhouse effect. For reasons of climate protection, TransnetBW, one of the four German transmission system operators (TSOs), focuses on eco-efficient technical concepts. In November last year, the TSCNET shareholder launched a pilot project at its substation in Obermooweiler, northeast of Lake Constance, with the world’s first gas-insulated switchgear (GIS) at extra-high voltage level using a climate-friendly alternative gas technology.

TransnetBW has now commissioned the new construction of the switchgear for the 380kV substation in Daxlanden near Karlsruhe, where the existing open-air facility will be replaced by two new GIS. Here, the TSO has opted for the so-called Clean Air technology, which exclusively uses processed air as an insulating medium instead of SF6. This significantly reduces the greenhouse effect of the entire switchgear system. The new GIS facilities will be built and commissioned gradually over the next few years and the existing open-air installation will be dismantled during ongoing operation.

The Daxlanden substation is an important network node in TransnetBW’s transmission grid and the central link between two grid construction projects from the German national Grid Development Plan for electricity (NEP), which contains essential grid extension projects to realise the energy transition. “A successful energy transition requires an efficient and future-proof transmission grid,” explains Dr. Werner Götz, Chairman of the TransnetBW Executive Board. “The more we are pleased to be able to make an additional contribution to the environment and climate protection by using the innovative Clean Air technology in Daxlanden.”

TransnetBW will build two GIS with Clean Air technology in the substation Daxlanden (computer simulation of the reconstructed Daxlanden substation: TransnetBW)

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> See TransnetBW press release, in German (html)

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New Amprion phase shifter in operation

06.11.2019

The German transmission system operators (TSOs) have to react with innovative technology to the changes in the German energy landscape caused by the shutdown of nuclear and other large power plants in the course of the energy transition. An important issue is the loss of reactive power, and an appropriate technological response are rotating phase shifters, which are highly efficient and flexible in the provision of reactive power to maintain voltage.

TSCNET shareholder Amprion has now commissioned such a high-performance system at its Illingen-Uchtelfangen substation in the German federal state of Saarland. It is the second rotating phase shifter in the Amprion grid after the TSO commissioned the first one in September 2018 in Oberottmarshausen (Bavarian Swabia). Amprion has invested €60m in the new state-of-the-art equipment, which keeps the transmission grid stable and thus further increases supply security in Saarland.

The commissioning ceremony was attended by Anke Rehlinger, Saarland Minister for Economic Affairs, Labour, Energy and Transport. Together with Amprion Managing Director Dr. Klaus Kleinekorte, General Manager of GE Grid Solutions Gerhard Seyrling and representatives of district and municipal politics, she pressed the “red button”, which symbolically put the facility into operation. Mrs Rehlinger commented on the new device: “Against the backdrop of the energy transition, grid stability and security of supply are becoming increasingly important. With the installation of the rotating phase shifter, Amprion is making an important contribution to the future of power transmission grids.”

Amprion has commissioned a new rotating phase shifter at the Illingen-Uchtelfangen substation (picture: Amprion;  Amprion CTO Klaus Kleinekorte and Saarland Minister Anke Rehlinger in the middle)

Linkup
> See Amprion press release, in German (html)

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Two transformers reach Garenfeld

05.11.2019

The last weekend was literally “heavy” for TSCNET shareholder Amprion, one of the four German transmission system operators (TSOs). Not one but two 276-tonne transformers were transported to Amprion’s Garenfeld substation in Hagen in North Rhine-Westphalia. It took both days of the weekend for the 30 kilometre stretch from the railway station to the substation. The special road transport units each had a total length of around 80 metres and together with the transformer each weighed 519 tonnes.

About 40 employees from various companies were involved in the transport during the two nights. At the end of August, the first of a total of five transformers had already been delivered to the substation. Amprion is currently planning to move the last two transformers to Garenfeld at the end of November.

Two transformers have been delivered to the Garenfeld substation operated by Amprion (picture: Amprion)

Linkup
> See last week’s announcement press release, in German (html)
> See Amprion tweet, in German (html)

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TenneT quadruples capacity across the Elbe

29.10.2019

A new Elbe crossing between the German federal states of Schleswig-Holstein and Lower Saxony for the transport of green electricity from North to South Germany has been completed. Tim Meyerjürgens, COO of the Dutch-German transmission system operator (TSO) TenneT, together with the State Secretaries Andreas Feicht and Enak Ferlemann, the Energy Ministers Olaf Lies (Lower Saxony) and Jan Philipp Albrecht (Schleswig-Holstein), has commissioned the new power line between the substations Hamburg/Nord (near Norderstedt/Schleswig-Holstein) and Dollern (Lower Saxony).

The new 380kV line of the TSCNET shareholder consists of four sections and is a replacement of existing lines with predominantly lower voltage levels to meet the requirements of the energy transition. A total of 110 masts were built or modified and 37 temporary masts were erected on several sections of the line. Almost all of them have now been dismantled. The installation of new conductor ropes at “Elbe Crossing 2” which has the highest pylons in Europe with a height of 227 meters, was also part of this demanding grid expansion project.

Tim Meyerjürgens explained on the occasion of the commissioning: “The extension of the 45-kilometre-long power line is an important component of the energy transition. This also includes the optimisation of the ‘Elbe Crossing 2’, the main artery in the three-phase transmission grid between Schleswig-Holstein and Lower Saxony, which serves as a bridge between the two largest wind power states in Germany.” With these reconstruction measures, Tennet has quadrupled the available capacity for the transmission of wind power in this area to 9.6 GW. The transit capacity between Denmark and Germany will also be increased, which is why the new connection is of central importance not only for the energy transition in Germany, but also at European level.

Picture: TenneT

TenneT has put new power line across the Elbe into operation (picture: TenneT; from left to right: TenneT COO Tim Meyerjürgens; Olaf Lies, Lower Saxony Minister for the Environment, Energy, Construction and Climate Protection; Jan Philipp Albrecht, Schleswig-Holstein Minister of Energy, Agriculture, the Environment, Nature and Digitalisation; Parliamentary State Secretary Enak Ferlemann; Andreas Feicht, State Secretary at the Federal Ministry for Economic Affairs and Energy)

Linkup
> See TenneT press release, in German (html)

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Construction start of DolWin 6 converter station

24.10.2019

The so-called DolWin wind farm cluster in the southwestern part of the German Bight is an important component of Germany’s future regenerative energy supply. TSCNET shareholder TenneT, the Dutch-German transmission system operator (TSO), is responsible for transferring the DolWin energy ashore. The DolWin1 and 2 onshore connections are in operation since 2015 and 2016 respectively, and DolWin 3 is ready for feed-in since September 2018. The other ongoing projects, DolWin 5 and 6, are also making good progress.

DolWin6 is a 900MW DC connection with a length of 90km. The associated offshore platform to convert the three-phase current generated by the wind farms into DC is DolWin kappa. Half of the 90km distance is covered by submarine cables and the other half by underground cables to transport the electricity from the landing site in Hilgenriedersiel to the TenneT facilities in Emden in the Lower Saxony region of East Frisia.

On the grounds of the Emden/Ost substation, the TSO is building a converter station and a transformer station to convert the DC back into three-phase current and feed it into the onshore grid. The first construction phase of the DolWin6 onshore converter station has now begun with the foundation work. In the next 6 months, 1000 piles with a length of up to 24 meters will be drilled into the ground to create a stable foundation for the station.

TenneT begins construction of the DolWin6 onshore converter station (pictures: TenneT)

Linkup
> See TenneT Tweet, in German (html)

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