Weryfikacja operacji przekaźnika zabezpieczeniowego odległościowego

This paper describes the possibilities of testing digital protection relay. Consequently, the SIEMENS SIPROTEC 7SA611 distance protection, its protection functions and its use for protection of the line are further characterized. At the end of the article, testing of this distance protection is described along with several variations of Advance distance module testing.W artykule opisano możliwości testowania cyfrowego przekaźnika zabezpieczeniowego. W związku z tym w pracy zostały opisane funkcje ochronne przekaźnika zabezpieczeniowego odległościowego SIEMENS SIPROTEC 7SA611 i wykorzystanie ich do ochrony linii energetycznych. Ostatnia część artykułu zawiera elementy testowania zabezpieczenia odległościowego wraz z kilkoma odmianami w module testowania „Advance distance”

Testowanie cyfrowego terminalu zabezpieczeniowego REF543

This article describes the digital protective relay REF 543 and its testing possibilities. The aim of this work is to verify overcurrent, undervoltage and overvoltage protection functions by indirect method using test equipment CMC 156. Among other things, IED REF 543 will be presented along with its features. The work is a space reserved for the description of the testing methods of protective relay.Artykuł opisuje cyfrowy terminal zabezpieczeniowy REF 543 i możliwość jego testowania. Celem tej pracy jest sprawdzenie funkcji nadprądowej, podnapięciowej i ochrony przed przepięciami metodą pośrednią z wykorzystaniem urządzenia testującego CMC 156. Wśród innych elementów pracy przedstawiono wykorzystanie REF 543 z jego funkcjami. Praca obejmuje opis metod testowania terminalu zabezpieczeniowego

The impact of electromagnetic radiation on the degradation of magnetic ferrofluids

This article deals with magnetic nano-fluids, which are the part of transformer oil ITO 100 and their behavior is influenced by a permanent magnetic field. We performed an IRC analysis in the time domain on the three different samples. Measurements were made before and after radiation of an electromagnetic field. The main objective was to examine changes in the properties of the samples due to the influence of the electromagnetic field. The measurements depend on the orientation of the external magnetic field. This behavior occurs especially during the structuring of the nanoparticles in the sample exposed to the magnetic field. These processes change the polarization of the liquid because the nanoparticles concentration is contained in the fluid

Additional Modification of Thermomagnetic Properties of Objects of Low Relative Permeability in Electromagnetic Field

This paper presents the characteristics of the foodstuff heating phenomenon using induction heating process by an induction cooker. The simulation setup was prepared according to the proposed magnetic material and configuration of the pot and induction cooker. The material properties of pot were varied among the several alternatives. The helical coil was designed on the base of the limitation of the induction cooker size and given number of coil turns and coil tube diameter with specific supplied electric current density. The data from the simulation analysis have to determine the enhancing of the highest heat transfer from induction cooker into pot. These data led to the modification of the material and geometrical properties of the pot in accordance to a minimum heating time and enhanced safety operation, especially close to unshielded magnetic objects

Influence of Electromagnetic Shield on the High Frequency Electromagnetic Field Penetration through the Building Material

This paper studies how to protect people against electromagnetic radiation inside a building. Widespread usage of the mobile communication led to building of more and more new GSM base-station antennas. These antennas are often placed in the areas with high population density. These antennas emit electromagnetic radiation in standard mobile operator frequencies, i.e. 0.9, 1.8 and 2.1 GHz. Many studies have shown potential biological and thermal effects of GSM electromagnetic fields, therefore people are concerned about their health. Electromagnetic wave does not penetrate the wall of the building as a whole. A small part of the wave is reflected and a small part is absorbed by the building material. In this paper the penetration of electromagnetic waves through the commercially available building materials is measured with specific focus on frequencies of 0.9, 1.8, and 2.1 GHz. Next, the surface of the chosen building material was coated with a magnetic conductive paint in order to improve the shielding effect of the building material. The results of experiment show how the electromagnetic shield reduces the penetration of electromagnetic waves through the building wall