A model of determining the time necessary for ln­ duction heating of a ferromagnetic cylindrical charge to the Curie temperature ls presented, together w:lth findlng lts sensitivity to variable lnput parameters. Whlle the geometry or the lnductor and charge are known together wlth ...

The paper describes the measurement of ovality of large induction machine rotor and the calculation of the air gap size along the rotor circumference. Also the withdrawal forces are calculated and the causes for its decline are discussed. The model is assembled and the influen...

This paper deals with the analysis of spatial harmonic components in multiphase single or double layer windings. It describes the methodology for magnetic field synthesis in the air gap and verifies the results on a five-phase induction machine using finite element method. The conc...

The paper briefly discusses simplified proposal of the design methodology, which suites for wireless power transfer system development. For this purpose, the most important aspects related to standards and regulations are initially discussed, while focus is given on automotive segment, i.e. ...

The paper proposes design procedure of several types of current sensors. The winding design is analyzed regarding its impact on operational characteristics and evaluated for preferred application. The paper also discusses the measurement results and given frequency characteristic and quality fact...

The article presents a research focused on reliability testing of glued joints on conductive textile ribbons during the washing and drying cycles. For the experiment, the textile ribbons with electrically conductive silver coated copper threads were used. The SMD chip resistors were con...

A novel control method based on model predictive control (MPC) dedicated to dual inverter (DI) control with minimization of switching losses is introduced. Optimal compromise between switching losses and current tracking error is reached by enlarging of the predicted steps count. The co...

Dielectric materials are an essential part of all electrical devices. One of the reasons, their properties are studied, is that they are most impacted by internal and external influences during the lifetime of the electrical device. Composite materials are commonly used as a dielec...

New developments of pixel detectors based on GaAs sensors offer effective registration of the transition radiation (TR) X-rays and perform simultaneous measurements of their energies and emission angles. This unique feature opens new possibilities for particle identification on the basis of ...

Recently proposed model predictive acoustic control of an AC drive relies on availability of the transfer function from the drive current to acoustic pressure. Since such model is typically not available, we propose to consider its parameters to be unknown and use methods of B...

The aim of this article is to verify the possibility of using inductive coupling for the on-line measurement of partial discharges MV cables. At its principle, inductive coupling records partial discharges that cause current changes over this coupling only. This natural selectivity can&...

This paper proposes new soft-switching interleaved boost converters (SSIBC) for photovoltaic power generation systems. The SSIBCs presented comprises with additional dual and single auxiliary cells. The main active switches of these converters are able to provide zero voltage switching (ZVS) and&...

The breakdown phenomena and determination of dielectric strength is one of the essential topics in the field of insulating materials for high-voltage applications. In the case of basic thermosetting plastics, including epoxy resins, dielectric breakdown analysis has been performed many times,...

Natural oils with their price and environmentfriendly behaviour are more used these days like insulation fluids in transformers. There are often based on eg. rapeseed, soy, sunflower etc. oils. Compatibility between new materials used in transformers needs to be further discussed. Few p...

Partial discharge (PD) is one of the major factors that damage dielectric materials in medium and high voltage components. Therefore, partial discharge evaluation is generally used to observe the status of electrical insulation in high and medium voltage components used in the performan...

The current trend in the field of industrial diagnostics of the electrical appliances is to lower the maintenance costs by appropriate procedures of optimization of all processes from design, manufacturing, operation to decommissioning and recycling. Online monitoring of the current state of...

MV distribution grids are often operated with arc suppression coils compensating dominating reactive fault current component when single-phase ground fault occurs. The paper deals with an active compensation in emulated distribution grid of 10 kV performed by a proposed three-phase active fa...

The paper proposes a design procedure of a current sensor. The winding design is analyzed regarding its impact on the operational characteristics and is evaluated for a preferred application. The paper also discusses the measurement results and given frequency characteristic and quality ...

This paper is focused on the analysis of selected dielectric parameters stability under the conditions of selected accelerated climatic aging. This stability is analyzed for glass fiber reinforced composites with different thermosetting matrix suitable for the production of electrical insulating ...

This paper deals with reliability of soldered / glued joints on electrically conductive textile ribbons during the electrical current ageing. The soldering was realized with tin-bismuth solder paste by hand soldering with hot air. The gluing was realized by UV curable non-conductive...