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Energies 2014, 7(12), 8116-8131; doi:10.3390/en7128116

Ground Return Current Behaviour in High Voltage Alternating Current Insulated Cables

1
Department of Industrial Engineering, University of Padova, Via Gradenigo, 6/A, Padova 35131, Italy
2
National Grid Electricity Transmission, Gallows Hill, Warwick CV34 6DA, UK
3
Power & Water Planning Division, P.O. Box 564, Dubai, UAE
*
Author to whom correspondence should be addressed.
Received: 23 September 2014 / Revised: 20 November 2014 / Accepted: 25 November 2014 / Published: 3 December 2014

Abstract

The knowledge of ground return current in fault occurrence plays a key role in the dimensioning of the earthing grid of substations and of cable sealing end compounds, in the computation of rise of earth potential at substation sites and in electromagnetic interference (EMI) on neighbouring parallel metallic conductors (pipes, handrails, etc.). Moreover, the ground return current evaluation is also important in steady-state regime since this stray current can be responsible for EMI and also for alternating current (AC) corrosion. In fault situations and under some assumptions, the ground return current value at a substation site can be computed by means of k-factors. The paper shows that these simplified and approximated approaches have a lot of limitations and only multiconductor analysis can show the ground return current behaviour along the cable (not only the two end values) both in steady-state regime and in short circuit occurrence (e.g., phase-to-ground and phase-to-phase-to-ground). Multiconductor cell analysis (MCA) considers the cable system in its real asymmetry without simplified and approximated hypotheses. The sensitivity of ground return current on circuit parameters (cross-bonding box resistances, substation earthing resistances, soil resistivity) is presented in the paper. View Full-Text
Keywords: ground return current; insulated cables; multiconductor cell analysis; asymmetric systems ground return current; insulated cables; multiconductor cell analysis; asymmetric systems
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Benato, R.; Sessa, S.D.; Guglielmi, F.; Partal, E.; Tleis, N. Ground Return Current Behaviour in High Voltage Alternating Current Insulated Cables. Energies 2014, 7, 8116-8131.

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