Abstract
Insulated underground cables have the potential to reduce power outages, maintenance costs, and transmission losses compared to overhead lines. On the other hand, they are exposed to several risks and physical damages, since they are buried in the ground. Though the cables are armoured in order to provide mechanical protection and achieve tensile strength, and also to provide effective conductance of earth fault currents. The main purpose of this paper is to introduce insulated underground cables, armouring process, and to analyze the induced currents in metallic parts such as sheath and armour that causeohmic losses which are categorized mainly in two groups as circulating current and eddy current. This paper presents a review on analytical techniques used to analyze the effect of magnetic fields, andcalculate the losses in the armour of the cables, besides providing the strategies and solutions used for armour loss reduction.
Highlights
As the reliability of power supply has become an increasingly significant factor, utilizing underground cables in distribution networks became an important issue to reduce the risk of major interruptions on overhead conductors due to storms
The main purpose of this paper is to introduce insulated underground cables, armouring process, and to analyze the induced currents in metallic parts such as sheath and armour that causeohmic losses which are categorized mainly in two groups as circulating current and eddy current
Copper wire armour (CWA) and aluminum wire armour (AWA) are the best choices for armouring single-core XLPE cables as they are non-magnetic, and there is no need to take the effects of eddy currents and hysteresis loss into account
Summary
As the reliability of power supply has become an increasingly significant factor, utilizing underground cables in distribution networks became an important issue to reduce the risk of major interruptions on overhead conductors due to storms. When single-core cables connect to indoor distribution devices, due to the space limitations, they collide with one another, making the installation of cable terminals challenging [1] The components of these cables that essentially determine the electrical and thermal behavior of the cable mainly consist of the current-carrying conductor, inner and outer semi-conductive layers as the insulation part, and the metallic screen. Steel wire armour is used (SWA), whereas a layer of protective aluminum armour (AWA) is used for single-core cables This is because a magnetic field is produced by the current which induces an electric current (eddy currents) in any ferromagnetic armour material, such as steel, which could lead to the cable overheating. This paper presents the analysis of armoured cables, their pertinent characteristics, and provides information on the strengths and drawbacks, as well as calculation methods for armour losses
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