Jaroslav Petráš

Modeling and computer simulation of electrical separation

The article deals with the application of the method for mathematical modeling and simulation at solving some issues in the area of electrostatic technology. It focuses on the processes in electrostatic separation and precipitation. Computer simulation is highly required in equipment design and their diagnostics in critical operating states using theoretical calculations and experimental data evaluation. The presented computer models may be applied both by project and design engineers using the most advanced computer-aided design of electrostatic technologies.

Measurement of polypropylene rope electrical strength

Paper focuses on electro-physical property measurement for polypropylene ropes with various pigmentation and diameter. Measurements are mainly focused on electrical conductance with various moistening times. Also partial discharge measurements were made. Four main parameters were observed: discharge rate, apparent discharge mean value, maximal discharge value and mean energy value.

Solid air exhale analysis

This paper is a contribution to solid air exhale analysis, regarding to outer insulation design. It describes the method of exhale collection, their composition measurement and their chemical analysis. Further proposals are made in conclusion for solid exhale analysis.

Transform methods used for partial discharge signal analysis

This paper describes partial discharge signal analysis and transform methods used for this analysis. It focuses especially on Fourier and Wavelet transform and points out the suitability, advantages and differences between these transforms.

New ways of smart electric installation control by human interfaces

The phrase “Smart House” means a building with structuralized installation systems, especially electric installation systems with connection to heating and air-conditioning systems, or to systems with multiple energy sources. Such a smart electric installation enables flexible changes in installation even after it has been installed by simple re-programming procedures of its components. Smart electric installation requires control interface that is easy enough to use even by unqualified personnel, users with disabilities or senior users. In our department we have developed web application for KNX EIB standard electric installation system that can be connected to any proposed human interface. This capability means freedom in design of control system according to user requirements. Thus complex visualization system for these installations is designed and it is prepared to connect to innovative human interfaces.

Inductive sensor usage for partial discharge measurements on high voltage coils

This paper describes experiments of partial discharge measurements made by linear and toroid sensors on high voltage coils. The aim of this work is to observe partial discharge development in dependence of insulation system quality and how it influences reliability device.