Abstract
Along with the geometric and electromagnetic properties, incorporation of multiple semiconducting screens in an underground (UG) power cable influences the primary line parameters as well as wave properties of the cable. The impacts of multiple semiconducting screens in UG cable structure compared to the cable with single and without semiconducting screen have been reported in this paper. The effective impedance of conductor-semiconductor assembly in cable structure is determined based on the electromagnetic theory of tubular conductor. Further, the complete impedance matrix of the UG cable with multiple semiconducting screens is determined in both mesh and phase domain and reported in this paper. The expressions of the impedances of UG cable with multiple semiconducting screens as obtained using the electromagnetic approach also have been reproduced using the conventional loop current method to justify the robustness and accuracy of the adopted approach. Comparative analyses of various line parameters and wave properties between UG cables with multiple, single and without semiconducting screens have been carried out by varying the frequency as well as semiconducting screen properties. Such analyses indicate that the inclusion of multiple semiconducting screens can lead to the improvement in wave properties of UG cable in high frequency zone.
Highlights
The wave propagation characteristics of underground cable are governed by the cable line parameters which are the function of cable geometric and electromagnetic properties
Most of the practical cable uses semiconducting screen between conducting and insulating layers, which has considerable effects on cable primary line parameters as well as wave propagation characteristics [13]–[15]. It called for a modification in the existing model of cable impedance and admittance [5] to include the effect of the semiconducting screen
This study shows explicitly that the introduction of multiple semiconducting screens in cable structure improves the wave propagation characteristics of the cable considerably compared to that of the cable with single and without semiconducting screen, especially at high frequency
Summary
The wave propagation characteristics of underground cable are governed by the cable line parameters which are the function of cable geometric and electromagnetic properties. Some works adopted different numerical methods like FEM or methods of moment (MOM) [35]–[38] or used conventional relationships [39] to study wave propagation through the cable containing semiconducting screen but refrain from discussing the effect of multiple semiconducting screens explicitly In this context, this paper attempts to present a complete analysis to determine the effect of introducing multiple semiconducting screens in cable structure on primary line parameters and wave properties of the cable. The effective surface and mutual impedance of conductor-semiconductor assembly present in cable structure are derived based on ‘Schelkunoff’s theory’ of tubular conductor system Based on these expressions, the complete impedance and admittance matrix of the cable with multiple semiconducting screens is determined in both mesh and phase domain. Based on (3) to (5), the surface and mutual impedance of each conducting and semiconducting screen present in the cable considered here are calculated
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