A Surface Admittance Approach For Fast Calculation of the Series Impedance of Cables Including Skin, Proximity, and Ground Return Effects

A Surface Admittance Approach For Fast Calculation of the Series Impedance of Cables Including Skin, Proximity, and Ground Return Effects Utkarsh R. Patel Master of Applied Science Graduate Department of The Edward S. Rogers Sr. Department of Electrical & Computer Engineering University of Toronto 2014 The accurate calculation of broadband series impedance of power cables is required to predict transients induced in power systems. Since modern power cables have complex geometries with hundreds of tightly packed conductors, existing techniques to compute their series impedance are either inaccurate or very slow. This thesis presents MoM-SO, a fast and accurate technique to compute the per-unit length impedance of cables made up of solid and hollow round conductors placed inside a tunnel in a multilayer ground environment. MoM-SO employs a surface-approach to solve for the impedance. In this approach, only fields on the boundaries of the conductors are discretized and calculated. As shown in the examples, this discretization scheme makes MoM-SO over 1000 times faster than existing volumetric-based methods like finite-element tools. MoM-SO is also accurate because it includes skin, proximity, and ground return effects which govern the behaviour of fields inside a cable.

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