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The paper presents analytical, experimental and numerical calculation, for the magnetic field produced by current passing through one-layer multi conductor power cable. The aluminum helical turns have the thickness (diameter) comparable to the winding radius. For the calculation of the parameters of the power cable was taken into account the magnetic field in the iron (steel) core, the central wire...
Ten years after signing the agreements and applying the reorganization of university studies, in accordance with the Bologna declaration and the Prague 2001, Berlin 2003 ministerial meetings, we say that, in our university, this is not a success. The “yet” word in our title keeps a trace of hope for the future. We try to explain what we do and what we think about current results, in the context of...
In this paper the magnetic flux calculation is presented on a cross-section inside a multi-wire conductor in which the aluminum wires are turned helically over a steel-core. The magnetic field is analyzed as depending on the turning step, the characteristics of the steel-core and the geometrical dimensions of the multi-wire conductor. Finite element method is used in this analysis, implemented in...
Detecting defects in transmission and distribution networks of electricity needs to be analyzed solving transient regimes. The complexity of electrical circuits associated to power grids requires the use of numerical methods for transient analysis. This paper uses PSpice program for analyzing transient faults caused by three phase short-circuits. Because a three-phase short circuit is symmetrical,...
The analysis of the transient regime of an electro hydraulic valve (EHV) is made in order to find the analytical expressions for the current variation. The transient regime starts when a D.C. voltage source is applied and after a short delay the variation of the inductance occurs during this process.
In this paper the influence of the medium voltage lines insulation ageing on some network parameters, namely the capacitive zero-sequence impedance of the network, the zero-sequence impedance of the grounding and arc-suppression coils taken together, as well as the equivalent zero-sequence impedance as seen from the grounding fault location, is analyzed. As a result of the analysis useful criteria...
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