Ground Return Current Behaviour in High Voltage Alternating Current Insulated Cables

Roberto Benato, Sebastian Dambone Sessa, Fabio Guglielmi, Ertugrul Partal and Nasser Tleis
Additional contact information
Roberto Benato: Department of Industrial Engineering, University of Padova, Via Gradenigo, 6/A, Padova 35131, Italy
Sebastian Dambone Sessa: Department of Industrial Engineering, University of Padova, Via Gradenigo, 6/A, Padova 35131, Italy
Fabio Guglielmi: Department of Industrial Engineering, University of Padova, Via Gradenigo, 6/A, Padova 35131, Italy
Ertugrul Partal: National Grid Electricity Transmission, Gallows Hill, Warwick CV34 6DA, UK
Nasser Tleis: Power & Water Planning Division, P.O. Box 564, Dubai, UAE

Energies, 2014, vol. 7, issue 12, 1-16

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.

Keywords: ground return current; insulated cables; multiconductor cell analysis; asymmetric systems (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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