Inductive voltage transformers are the basic components of the switchgear equipment or electrical substations. This article presents problems related to their operation. Inductive voltage transformers were exposed to specific working conditions in the form of ferroresonance oscillations with the participation of measurement and protective transformers. The disadvantage and negative significance of the phenomenon contributed to the development of the most convenient elimination methods, which is the main goal and achievement of the publication. The analysis of the proposed solutions were carried out on a theoretical model of a 30 kV power network model created and run in the Electromagnetic Transients Program/Alternative Transients Program (EMTP/ATP). The article presents several results of computer simulations carried out together with their complete characteristics (phase voltage waveforms on the primary side of voltage transformers), which allowed us to indicate the disadvantages and advantages of the solutions developed, and choose the most favorable methods to eliminate nonlinear oscillations. In the article, we present an analysis of all aspects contributing to the solution to the problem. This has permitted an appropriate conclusion to be made indicating the advantage of the method based on the use of a damping resistor in the open delta circuit compared to other solutions. Current solutions are largely based on a product using active variation of the resistance of an open delta attached resistor. The concept in this paper is based on a fixed resistance value, which is a different approach to the problem. By using a switch, the resistor is only connected when a fault occurs. Thanks to this solution, the secondary winding of the open delta is not additionally loaded (despite the very high resistance) at all times during the operation of the power network, as is the case with the available solution.

The aim of article is to discuss interaction between stents implanted in the body of worker and harmonic magnetic field in the vicinity of electric wires. In last decades, a growing proportion of people has any devices implanted, to list: cardiac pacemakers, cardioverter – defibrillators. Recommendations of International Commision on Non-ionizing Radiation Protection (ICNIRP), and resctrictions imposed in different states, may exlude specific individuals from their duties. The autors focused on the situation, when the employee with stent, works in the immediate vicinity of overhead electric wires, cleaning with dry ice the electric insulators.

Static electric fields are used, among others, in technological processes such as electric separation. Electrodynamic separation is a process of separating two or more solid phases of various physical properties by electric field forces. The advantage of electrodynamic separation is possibility of obtaining separation of individual components in dry conditions. This eliminates many operations such as thickening, dewatering, hydrotransportation, additional drying which cause higher energy consumption and higher separation process costs. Efficiency of beneficiation depends on many factors such as: electric properties of feed components, feed particle size distribution, drum rotary speed, electric field intensity in working space of separator, configuration of electrodes or surrounding conditions.The paper presents the working of high-voltage drum separator. The analysis of electric field distribution in separator working space was done. Additionally, distribution of forces acting on particles of dielectric and conductive properties was examined, trajectories of charged particles movement were presented too. The laboratory investigations of electronic wastes were performed in two particle fractions: 0.25–0.5 mm and 0–0.25 mm. It was observed that as a result of selective charging of particles they separate according to surface ability to electrifying what allows to obtain selective separation of components being so-called electronic wastes. The application of electrodynamic drum separator allows to separate such elements as Ti, Cu, Fe, Pb, Sn from plastics occurring in electronic wastes.

Unambiguous design of each coil, applied in Transcranial Magnetic Stimulation (TMS) procedure, involves assigning it a set of parameters. The use of just a few or several, real-valued parameters for this purpose is convenient, and renders the optimization procedure less complicated. Hence, using parametric curves is an appropriate method. Several types of coils used in TMS procedure are presented. Each of them is characterized by a set of parameters that, coupled with five others that describe the shift and rotation of the coil in space, allow a clear characterization of the device, as well as its position relative to the patient's body. This approach is related to the basic aspects of optimization in biomedical engineering.

This article provides a narrative review of the technical, computational and clinical aspects of transcranial brain stimulation (TBS), with an emphasis on transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS). The review addresses three central questions: which physical, engineering, and biological principles determine the generation, propagation, and focality of electromagnetic fields in the human head. The second question asks how modeling approaches, stimulation parameters, and hardware design influence the accuracy, safety, and individual variability of brain stimulation. And, finally, how these technical factors translate into current clinical applications, therapeutic efficacy, and practical limitations. The key take-home messages are as follows: for engineers, realistic anatomical head models, precise coil/electrode placement, and reliable numerical solvers remain essential for predicting field distribution and optimizing stimulation protocols; for clinicians, stimulation outcomes are strongly dependent on anatomy-specific field patterns, safety constraints, and device-related parameters that require careful adjustment; and for both groups, despite significant technological progress, effective and reproducible stimulation still demands systematic protocol refinement and individualized planning. Overall, this review integrates contemporary technical knowledge with clinical perspectives to support evidence-based use and future development of TMS and tDCS.

Individualization of therapy for each patient is difficult to carry out because of computational complexity. However, there is a possibility to obtain the view on the construction of the apparatus used in magnetotherapy by series of optimization processes. The results presented in this publication show that the construction and location of the device may vary significantly depending on the criteria.