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Underground cable systems ground return sensitivity to soil inaccuracies

The soil characterization of an underground cables installation may be poorly known and present a wide variation throughout the year. This represents a challenge when it comes to an accurate evaluation of transient overvoltages/currents and the correct assessment of voltage and current profiles throughout the circuit. This paper presents a discussion based on a sensitivity analysis for the ground return impedance of underground cables systems to soil resistivity, which is typically considered as a deterministic parameter.
For the evaluation of the impact of uncertainties we have considered the analysis of the most common configuration in cable systems. A frequency domain analysis was carried out to assess the actual impact of the uncertainties in terminal voltage and currents. Results indicate that the usage of sensitivity might provide a helpful insight in the impact on the overall system performance with respect to soil resistivity uncertainties.

Author(s):

João Pedro Salvador    
Federal Center of Technological Education Celso Suckow da Fonseca,
Brazil

Antonio Carlos Siqueira de Lima    
Federal University of Rio de Janeiro
Brazil

Maria Teresa Correia de Barros    
IST-ULisboa
Portugal

 

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