Measurement, evaluation and proposed solution for power distribution arrangements with electrical cables in parallel

The electrical installations to supply power for heavy loads usually are three-phase and have several cables in parallel. One reason for this choice has been the mechanical difficulties that arise when cables are too large. The shape or arrangement of cables within the conduit, beds, cable trays, or other assembly systems for cables can make each cable have a different impedance and, therefore, cause uneven distribution of the current between the cables of the same phase or circulating currents that appear in the neutral conductor. Using the Finite Element Method (FEM) or applying the solution of analytical equations, one can better understand this problem and, thus, propose solutions. This paper implements the analytical methodology, analyze it through the FEM, and take measurements in the laboratory. Thus, the method will be validated and then applied to the study of a proposed case. The purpose of this study is to present a methodology that can contribute to maximize cable ampacity and to improve the shelf life and the energy efficiency of the installation.