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Effect of plastic deformation on the magnetic properties of selected austenitic stainless steels

Orsulova T., Palcek P., Kudelcik J.

Production Engineering Archives

2017

Vol. 14

15--18

Austenitic stainless steels are materials, that are widely used in various fields of industry, architecture and biomedicine. Their specific composition of alloying elements has got influence on their deformation behavior. The main goal of this study was evaluation of magnetic properties of selected steels, caused by plastic deformation. The samples were heat treated in different intervals of temperature before measuring. Then the magnetic properties were measured on device designed for measuring of magnetism. From tested specimens, only AISI 304 confirmed effect of plastic deformation on the magnetic properties. Magnetic properties changed with increasing temperature.

Measurement of electrical parameters of breakdown in transformer oil

Kudelcik J., Gutten M., Virdzek P.

Przegląd Elektrotechniczny

2011

R. 87, nr 8

159-162

The initial state of breakdown development is explained on the basis of bubble theory. Application of HV-DC voltage to electrodes immersed in oil results to creation of small channels, in which streamers can develop. In the next phase a plasma channel between the electrodes can be formed. The electrical resistance of plasma channel changes from a few ohms to a few hundred milliohms due to Joule heating caused by high arc current which flows through the plasma. The dynamics of the arc current depends on the parameters of outer circuit and is represented by RLC circuit.

Początkowe stadium przebicia w oleju transformatorowym jest analizowane przy wykorzystaniu teorii bąbli. Przyłożenie dużego napięcia DC powoduje powstawanie kanałów. W następnej fazie powstaje kanał plazmowy między elektrodami. Rezystancja kanału plazmowego zmienia się od kilku omów do kilku miliomów na skutek ogrzewania łukowego. Parametry wyładowania łukowego zależą też od zewnętrznego obwodu RLC.