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Hardware in the loop (HIL) simulations are used widely in each of industry market — starting from automotive sector to high voltage power electronics plants. Popularity of hardware in the loop systems is caused by savings on the time spent on commissioning of developed systems. Nowadays, there are available many providers of hardware in the loop simulation systems on the market, but each system has...
In the paper the influence of conductive disturbances on transformation of fault current by inductive protective current transformers is described. Analysis of the results from laboratory studies show, that for such condition primary current up to which the current transformer will comply with the requirements for composite/ratio error is decreased. This is caused by increased magnetic flux density...
Accuracy requirements at harmonics are defined for electronic current transformers in IEC 60044-8 standard. As indicated there defined limiting values of current error ensure that the contribution of harmonics measurement error would add roughly 15%, in the worst case, on the theoretical error of the corresponding power metering class accuracy. In accordance with IEC 61000-3-12 standard total harmonic...
The aim of the paper is to present results concerning the influence of conductive disturbances on accuracy of transformation of distorted signal main harmonic through the inductive current transformers (CTs). Analysis of the results from the laboratory studies shows, that conductive disturbances in the CT primary current, in some measuring conditions, cause decrease of the accuracy of transformation...
During transformation of power frequency currents inductive current transformers (CTs) are characterized by precise, acceptable in accordance with their accuracy class, values of current errors and phase displacements. CTs catalogues do not specify metrological properties of transformation for distorted currents. The aim of the paper is to present a new method for evaluating the metrological parameters...
To assess the quality of electricity supply through the power networks it is necessary to use instrument transformers or other devices for measuring voltages and currents of considerable values. In many terminals the quality of electric energy is significantly deteriorated and this result in the occurrence of the conducted disturbances in the primary signal of the instrument transformer which cause...
The subject of the article are the issues regarding the changes of the equivalent and magnetic circuits parameters of the current transformer with toroidal core (made from permalloy NiFe 80) during the transformation of distorted signals. Working mechanism of the windings system and magnetic circuit of transformers in these conditions are being changed as well as their metrological properties. The...
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