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egeplast
egeplast
Contacts
Till Ruland
+49 2381 7990-737
Heiner Dokters
+49 2575 9710 141
In the context of the energy turnaround, the energy landscape in the southern Emsland district is in flux. Hanekenfähr is the site of the Emsland nuclear powerplant which will go offline at the end of 2022. At the same time, increasing quantities of wind energy from the north will need to be integrated into the grid in a way which makes sense. Thus, the offshore grid connection systems, DolWin4 and BorWin4 are scheduled to be connected to the transmission grid in the Amprion Hanekenfähr substation in 2028 and 2029.
To stay abreast of these changes, Amprion plans to perform comprehensive works in the Hanekenfähr substation. One major measure involved in this process is the installation of two phase-shifting transformers providing for better control and optimisation of the power flows. In the context of a so-called land clearing, some overhead lines needed to be dismantled and routed underground. For this partially trenchless installation project, which also involved a railway underpass, egeplast Power Protect PE-RT protection layer pipes for high- and very high voltage cables featuring a low-friction internal layer and individual identification markers were installed.
“Here, the high degree of precision required when inserting under very confined space conditions represents a major challenge. In this case, a suitable system solution for cable protection pipes is indispensable.”
civil engineer (M.Sc.) Till Ruland, Bernhard Heckmann GmbH & Co. KG Bauunternehmen
Lingen (Emsland) is a city which traditionally has had a reputation as a significant energy location in the southern Emsland district. At present, the Emsland nuclear power plant, which will be taken off the grid at the end of 2022, still continues to feed 1.4 GW into the grid in Amprion’s Hanekenfähr substation. At the same time, the integration of wind power is gaining increasing importance at the Hanekenfähr site. In 2028 and 2029, this is where Amprion will commission the two offshore grid connection systems, DolWin4 and BorWin4. Prior to that, the Hanekenfähr substation will undergo extensive expansion and remodelling, including the installation of two phase-shifting transformers and the expansion of facility by several switch panels. This step requires some land clearing by means of cabling multiple overhead lines. This is realised in two construction phases as an underground cable system:
1st construction phase: Installation of a new 110-kV high-voltage threephase current connection via an underground cable
This connection consists in two 110-kV-systems with three 110-kV underground cables each (connection of the “Rühle-Ost” and “Hanekenfähr-Holthausen” circuits) and leads from Hanekenfähr to the cable lifting mast.
The first segment involved an underpass of the railway tracks connecting Münster and Norddeich using the pipe jacking method for DN 1,200 mm covering a tunnel length of approx. 100 meters. Subsequently, two cable conduit bundles including the relevant tracer pipes were inserted into the jacking pipe.
For the second segment, which was approx. 700 meters long, the open-trench method was applied. For this purpose, egeplast Power Protect PE-RT protective layer pipes for high-voltage and very high voltage pipes featuring a low-friction internal layer and individual identification were used to guarantee a correct connection to the supply system in question along with the subsequent insertion of the underground cables, as civil engineer (M.Sc.) Till Ruland from Heckmann Bau explains: “Here, the high degree of precision required when inserting the pipe bundles into the DN 1,200 mm jacking pipe under very confined space conditions represents a major challenge. In this case, a suitable system solution for cable protection pipes is indispensable”.
2nd construction phase: Preparation of 110-kV- and 220-kV underground cable routes
The expansion of the Hanekenfähr substation involved previous land clearing operations, which in turn required reverting to underground cables for the existing 110-kV and 220-kV-overhead lines. The line routes run in the pre-existing North-South axis across the facility, south of the existing Hanekenfähr substation as well as west of its extension. The installation was carried out in the form of underground cables applying open-trench installation and egeplast Power Protect PE-RT protection layer pipes for high- and very high voltage cables.
The excavation and pipeline works were performed by a consortium consisting of Bernhard Heckmann GmbH & Co. KG Bauunternehmen, Knoll GmbH & Co. KG and Sonntag Baugesellschaft mbH & Co. KG. As civil engineer (M.Sc.) Till Ruland commented on the cooperation: “Timely completion of construction projects of this kind absolutely requires a supplier providing a high-quality production range and service quality. egeplast has had many years of experience with handling projects of this type and once again was characterised by significant supply flexibility and excellent service. With regard to construction, we are right on schedule and will be able to complete this project in due time.”
egeplast
Power Protect PE
| Protection layer pipes for high and very high voltage cables featuring a low-friction internal layer and individual identification markers. |
| UV-resistant signal colour layer |
| Solid wall or coextruded, optionally with stripes |
| Inspection-friendly inner layer: optionally low-friction or abrasion-resistant |
| Project description | 110 kV / 220 kV AC cable; Hanekenfähr substation |
| Challenges | Installation of a cable protection system for 110 kV or 220 kV high-voltage AC transmission |
| Solution | Application of egeplast Power Protect PE-RT cable protection duct system providing increased heat stability for high- and very high voltage cables for up to 525 kV |
| Installation | Open-trench and trenchless construction (pipe jacking DN 1,200 mm) |
| Pipe system | 4.800 m Power Protect PE-RT d 200 x 11,9 mm (with low-friction inner layer and individual color coding of stripes) 5.060 m Power Protect PE-RT d 200 x 11,9 mm 13.320 m Power Protect PE-RT d 250 x 14,8 mm PE-RT electrofusion couplers |
| Parties involved in the project | Client: Amprion GmbH Planner: Ingenieurbüro H. Berg & Partner GmbH Installer: Arbeitsgemeinschaft Bernhard Heckmann GmbH & Co. KG Bauunternehmen, Knoll GmbH & Co. KG, Sonntag Baugesellschaft mbH & Co. KG. |
Till Ruland
Project Manager Civil Engineering and Roadway Construction Bernhard Heckmann GmbH & Co. KG Bauunternehmen
E-Mail: till.ruland@heckmann-bau.de
Tel.: +49 2381 7990-737
Heiner Dokters
Head of Business Unit Energy Solutions, egeplast international GmbH
E-Mail: heiner.dokters@egeplast.de
Tel.: +49 2575 9710 141
