High-voltage cable systems

High-voltage cable systems

Success in numbers – more than

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  • Siemens is a trusted partner for utilities and companies around the world, with a large number of successful projects over the last 60 years for high-voltage cable systems from 110 kv to 500 kV.

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Siemens as your partner

Independent solutions for cable systems

High-voltage cable systems are the backbone of electrical energy supply. Technically sophisticated high-voltage cable solutions are needed for both megacities and the expansion of the power supply. Siemens has customized services in its portfolio to meet this requirement.

Your partner for the entire life cycle of your project

Space restrictions and other external influences constraining the current-carrying capacity of a cable system demand particular measures and skilled configuration to guarantee the reliable transmission of electrical energy via high-voltage cables.

The inclusion of renewables is currently creating quite unique demands on the expansion of the transmission networks in Germany and around the world. As your partner we offer all services for high-voltage cable systems up to 500 kV from a single source – from drawing up the cable dimensions to final testing as part of the commissioning process. With almost 170 years of experience and more than 100 successful projects behind us, we have an overview of the entire market and can advise and look after you with regard to accessories, without being dependent on one single manufacturer. Make use of our engineering, procurement, and consulting services (EPC).

For every job, we use the right technologies for your needs, as well as high-quality materials. This covers the selection of appropriate cable types and accessories, as well as the choice of the right routing tools and sending tested, reliable employees to assemble your cable systems, including sealing ends and connecting joints. We’ll also be there to help if you want to retrofit, convert, or expand your system. And if you want to dismantle an existing system, we will look after disassembling and professionally disposing of cables and cable accessories, and recycling them as appropriate. It goes without saying that we perform all work in accordance with national or international regulations and guidelines.

Support when you need it

Siemens offers customized services for every project. If you require it, we will assume full management of your project and look after it throughout the entire project life cycle. Our services cover all tasks from consulting on financing and project management to engineering, delivery, assembly, and commissioning, as well as after-sales services, dismantling, and recycling.

Of course, it is possible, depending on the project, to procure only selected services from Siemens and to look after the project management yourself, which may prove to be a practical option. Siemens has completed many projects involving individually compiled solutions for many different customers in a range of industries.

Turnkey solutions

By request, we can provide you with turnkey solutions for high-voltage cable systems. In these cases, Siemens handles all the necessary stages of the project, starting with initial consulting and a feasibility study, including a precise analysis of the requirements, local situation, and time frame. 

Because Siemens is not tied to any manufacturer, we can work out the best solution for your challenges. We assume the work of project management, engineering, and design, setting up the construction site and the construction works, as well as procuring the materials. We supervise and monitor the factory testing of the cables at the manufacturer’s premises, arrange transport to the construction site and then perform the installation work and commissioning on-site. After-sales services, any maintenance work or disassembly and recycling all form part of our range of services. If needed, we can also provide assistance with our wide range of financing solutions. 

Save time and cut costs

The search for the best provider for your individual project is usually time-consuming. With Siemens as your partner, you can free yourself of this responsibility and focus on your actual business. We use the requirements you supply to work out the provider that will be the best from a technological aspect and also the most favorably priced; we will look after materials procurement and transport, and also local work. 

Thanks to our decades of experience we know what quality and reliability involve, and can select the most economical offers and tailor them precisely to your project, with no ties to particular manufacturers or products. That means you save both time and money.

How you benefit from having Siemens as an independent partner

  • You will receive a technically and commercially optimized manufacturer-neutral solution 
  • You will profit from our experience collaborating with international contractors on project management and documentation 
  • You will benefit from our long-time experience in developing complex engineering solutions 
  • You can rely on short reaction times for clearing faults

Complete range of services from planning to after-sales

  • Consulting, preparation of tender documents, and project-based specifications 
  • System engineering, clarification/calculation of mutual interference (as regards EMC and heating) between contract sections on-site 
  • Manufacturer-neutral consulting and project optimization 
  • Preparation of complete bids, clarification of interfaces, procurement 
  • Installation and commissioning of medium-voltage and high-voltage cable systems from a single source in accordance with national and international regulations and recommendations 
  • Handling of turnkey projects by certified project managers 
  • Fault diagnosis on existing cable installations, for example through temperature measurement using thermal imaging camera, partial discharge measurement, or cable oil inspections 
  • Maintenance, fault location, fault clearance, inspections, modernization, and dismantling of old installations

Siemens expertise in high-voltage cable systems

Siemens handles the entire technical calculation process for high-voltage cable systems. For live cable systems we calculate current-carrying capacity for operation under rated conditions (constant and cyclic load), for emergency load operation and for transient operation with regard to transient heating. To determine short-circuit capacity the thermal current-carrying capacity of the conductor, sheathing, and shielding are evaluated, and also the short-circuit forces for sufficient dynamic current-carrying capacities.

Capacitance, charging current, earth-fault current, and charging capacity are calculated to determine the electrical characteristic values of the cable system. 

Also computed are inductance, induced voltages and currents in ground wires, metal sheaths, and shielding. Symmetrical components (zero, positive-sequence and negative-sequence impedance) are provided also by measurement. 

In case of high load connections, it may be necessary to reduce the losses in the cables by the use of special bonding methods like single-point or cross-bonding of the metallic layers. In these cases Siemens calculates the induced voltages in the metallic layers and selects the correct size for the cable sheath voltage limiters. 

During a site visit the installation of the cable system can be planned. This includes the selection of cable joint positions and the creation of a laying concept. Especially when cables have to be pulled into longer pipe sections, the calculation of pulling forces helps to determine optimized cable lengths. The calculation of electrical and magnetic fields around cable systems can also be performed.

If existing, low-pressure oil-filled or gas pressure pipe type cables have to be rerouted or have to be jointed. In case of repair works on these cables Siemens has got the necessary resources of skilled jointers and special tools.

Current activities

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Additional information

Please find here our brochures, contact details for individual consulting interviews, and further information.

Power Transmission Service

Siemens supports the development of the power transmission and distribution grid with its strong team of experts and a number of services


High-voltage cable success stories

For almost 170 years, Siemens has used its skills in the area of electrification to help companies successfully implement their projects. Companies from all industries worldwide benefit from Siemens’ expertise and the fact it is not bound to any particular manufacturer.  

HelWin2 offshore power link

TenneT | Helgoland, Germany HelWin2 is one of several grid connections for offshore wind parks in the North Sea, which Siemens built for the German-Dutch transmission grid operator TenneT. Siemens delivered the turnkey solution for the full-featured, swimming, and self-righting platform, including internal AC cable connections between GIS switchgear and transformers.

Individual solutions

We offer individual advice

As a manufacturer-neutral partner, Siemens ensures that you get the best solution for your particular challenges. Arrange a free consultation with us.

For more information please contact our Customer Support Center:

Customer Support Center