Inductance of 3-phase transmission lines of different layouts with focus on cables in flat formation

Three phase transmission lines are predominantly used in the transmission of electrical power. These lines with single or segments of cables can be of asymmetrical or symmetrical constellations. Air borne, subterranean and subsea transmission lines are some of the variations found in practice. In any given grid, a combination(s) of all these types of cables can be found. Simulation studies of transmission line networks need among others, the accurate values of the parameters of the lines used in the network. In this paper, estimation methods are presented to compare the electrical parameters of some of these cable types. The impedance of a screened three phase cable is represented by a 3×3 matrix. Finally, measurement procedures are described to estimate the elements of the impedance matrix and the impedance associated with symmetrical components.