High-Voltage Direct Current (HVDC) systems are transforming the global energy landscape, distinguished by their efficiency, stability, and low impact on the electrical grid. One of the challenges of HVDC transmission line design is assessing the generated stray magnetic field, as it can have negative effects on human health and the environment. This study presents an analytical methodology for calculating the magnetic field density at any point along an HVDC line corridor. It considers the spatial configuration, the current per pole, and the location of the conductors. The equations allow for the calculation of the horizontal and vertical components of the field, as well as its total magnitude. A practical case study of a ±500 and ±600 kV HVDC two-pole transmission line is presented. The methodology was programmed in MATLAB^® version R2024a to calculate the magnetic field density, and the results are consistent with those obtained with the established methodology. The presented methodology can be applied to monopolar and two-pole HVDC overhead transmission lines, offering speed and accuracy.

This paper presents the design of an experimental reactor based on hardware and software, which monitors the reaction parameters of leaching processes for the recovery of lithium from waste battery cathodes. The hardware consists of a 250 ml double-layer reaction bottle, a magnetic stirring controller, and an Arduino-based system for measuring the temperature and pH of the reaction. The measured data is fed into the software, where it is processed to determine reaction parameter profiles. The experimental reactor will fulfill its purpose by correlating the selective lithium recovery efficiency with the different reaction profiles carried out, which will allow the identification of key variables, the establishment of mathematical models that describe the behavior of the reaction, and the determination of the conditions that improve the efficiency of the process.