1,720,981 research outputs found
Determining cables metrics using 3D ultrasonic scanning
No full textAn examination of XLPE cable samples is reported using an ultrasonic scanning technique which potentially offers improved quality assurance for cable buyers. Dimensional parameters are reported along with a more detailed investigation of variations at the inner semicon-insulation interface which correlate with characteristics of the cable construction
Additive manufacturing – understanding the implications and opportunities of novel manufacturing techniques on the electrical power sector
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Cable oversheath selection: the right material for the right application
No full textThe oversheath (jacket) of a cable provides the first line of defence for the cable during transportation, installation and throughout its life. As such the oversheath is an integral part of the cable system and choosing the appropriate material is essential to protect the cable throughout its life. This paper reviews the range of oversheath materials in use today by utilities, and will focus on which are most appropriate in particular situations. A particular emphasis will be placed on benefits of modern halogen free flame retardant (HFFR) compounds as an alternative to PVC.</p
Cable oversheath materials: The first line of defence for improved cable reliability
No full textThe reliability of newly installed cables is expected to be as high as possible from commissioning to replacement. The cable oversheath (jacket) provides the first line of defence for the cable during transportation, installation and throughout its life in the laying environment. As such choosing the most appropriate oversheath material is essential to protect the cable at all stage of its life.</p
The influence of molecular-organization on charge transport in electrochemically prepared polypyrrole films
No full textLetter to the editor. Electrical conductivity data is presented for two types of polypyrrole film prepared using toluene sulphonate and sulphate as the counter-ions or dopant. The films based on polypyrrole and toluene sulphonate exhibit an ordered molecular organisation in which the planes of the aromatic units lie preferentially parallel to the film surface. For such films the conductivity versus temperature data fit to a 2D variable range hopping model. In contrast, films using SO42- as the dopant show an isotropic highly disordered molecular organisation and a temperature dependence of the electrical conductivity which fits a 3D variable range hopping model. Although such models present a rather simple picture of conductivity in these complex molecular composites, they do demonstrate the strong and direct influence of the molecular organisation on their electrical transport properties
Review of global HVDC subsea cable projects and the application of sea electrodes
No full textSea electrodes have been used since the first HVDC subsea links were installed in the 1950s and provide a simple proven solution for the return current path. Today around 30% of the approximately 40 HVDC subsea links in service use sea electrodes as the return current path under normal or emergency operation conditions. This paper reviews the evolution of interconnectors with sea electrodes and the factors, such as location, environmental impact, current capacity and financial factors (cost, flexibility, losses) which need to be assessed before adopting a sea electrode. In particular findings from environmental studies undertaken on existing sea electrodes are reviewed, as well as, the detailed content of recent Environmental Impact Statements for HVDC projects with proposed sea returns. Finally, the reasons for a change in design on links with a proposed sea return to a metallic return are also considered
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