Design Optimization of Electrical Contact Resistance in High-Voltage Cable Joints with Numerical Analysis
Driven by society’s need to tackle climate change, transmission of electricity from renewable sources is and will be an expanding business for years to come. A shift toward offshore wind and solar power generation combined with increasing electricity demands as existing power sources are being replaced causes electrical grids to grow more complex and interlinked between producing units and consuming regions. A ceaselessly expanding number of high voltage cables in the ground or in the sea transmit energy over long and challenging distances with constantly increasing requirements on performance.
Although produced impressively long, high voltage cables still need to be jointed to reach continental scale distances as well as to connect to other equipment or interfaces in the electrical system. Each joint poses a risk as large currents need to pass a cross-section where there is an interface between two separate conductors. Especially so for subsea dynamic cable systems where the mechanical loads on the cable and joint are varying or cycled over time. Even a partial loss of contact between the conductors in a high voltage cable joint may lead to rising current densities, rapid power development and possibly overheating. Designing reliable joints is hence essential to prevent electrical failures that destroy the operability of entire cable systems.
The objective of this thesis work is to leverage the understanding of the electrical contact resistance in high voltage conductor joints and to find ways to minimize it by means of geometrical, material and process optimizations with numerical simulations. This in order to minimize power losses and avoid the risk of equipment overheating and damage in high voltage cable systems and accessories. The theoretical description of the joint lies in the overlap between different kinds of physics and complex geometries where numerical multiphysics software offers an attractive strategy to solve problems. Access to software and a state-of-the-art private cloud for high performance computing to enable solutions to complicated and large numerical problems, is provided at the NKT Technology Consulting Center in Västerås where the work will be conducted. The project will however be carried out in close collaboration with engineers at the NKT production facilities.
The proposed main thesis work activities are:
• Literature overview of contact resistance minimization techniques
• Development of numerical models for contact resistance evaluation of candidate geometries and materials at different conditions
• Validation and comparison of model results with available resistance and thermal experimental data
• Application of simulation models to test and optimize novel joint configurations
• Writing report and presenting results
Qualifications and requirements
The required qualifications are:
• Master student in Engineering Physics, Electrical Engineering, Applied/Computational Mathematics, Electromagnetics, Computational Fluid Mechanics or any related field.
• Good knowledge of electromagnetics, thermal physics, material science and numerics.
• Experience in using FEA commercial software, e.g. Comsol Multiphysics.
• Excellent command of spoken and written English.
Contact and application
Apply with CV, personal letter and transcript of grades via the link below , at latest September 30, 2022.
Tests can occur in our recruitment processes.
If you have any questions regarding the position, you are very welcome to contact Recruiting Manager, Giampaolo Martufi, Giampaolo.Martufi@nkt.com or +46 72 715 22 75 .
Please note that due to the GDPR regulations we cannot accept any applications via e-mail
Sveriges Ingenjörer – Zohreh Keshavarz, +46 72 451 80 18
Welcome with your application!
Join a diverse and international team of experts developing the power cable technology of the future with focus on deeper sea, lower losses and higher performance. Technology is leading the corporate R&D program including material development and operating some of the most advanced high-voltage test centers in the industry. NKT also operates a Technology Consulting center in Sweden, where technical experts and scientists supports industries worldwide in cross-disciplinary R&D projects and technical investigations.
NKT connects a greener world with high-quality power cable technology and takes centre stage as the world moves towards green energy. NKT designs, manufactures and installs low-, medium- and high-voltage power cable solutions enabling sustainable energy transmission. Since 1891, NKT has innovated the power cable technology building the infrastructure for the first light bulbs to the megawatts created by renewable energy today. NKT is headquartered in Denmark and employs 3,900 people. NKT is listed on Nasdaq Copenhagen and realised a revenue of EUR 1.8 billion in 2021. NKT - We connect a greener world. www.NKT.com.