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This paper describes an alternative method of correction of the influence of wind speed within thermographic measurements of power system components. Instead of measurements of wind speed measured temperature of a resistor fed by known electrical power is used. The paper gives theoretical background of the method and measurement's results.
The main task of this paper is to introduce the created measuring system which is used for analysis and data acquisition of measuring devices and sub-sensors installed on an experimental cold crucible. The motivation for creating a measuring system was need to accurately monitor and measure the behavior of the individual components of the cold crucible. Another reason for the development of measuring...
The main objective of this paper is to introduce the possibilities of resistance furnace control performed by cyclic and phase control. The measurement is based on individual case of functional model of a muffle furnace. The thyristor device EPAC is used to regulate the power supplied to the load. This device allows setting the cyclic or phase control via PC. Both the types of controls were tested...
The paper deals with the DC link voltage ripple of voltage-source active rectifiers switched by PWM. The DC link voltage is maintained constant by a converter control; it fluctuates around the desired value. Therefore the first part of the paper describes the influence of voltage-source active rectifier parameters on the DC link voltage ripple. The effects of capacitors, loads and switching frequencies...
The article deals about magnetic fluids based on a transformer ITO100 oil and about behaviour of these fluids under influence of permanent magnetic field represented by time-current characteristics. The measurements were performed in an anechoic EMC chamber and outside the chamber for comparing the results on the same samples. The main objective was to determine how much is the measurement influenced...
Due to the recent situation in the neighbouring countries, where icing damaged many transmission and distribution power lines and caused financial losses, it is necessary to operate weather stations. Last icing events caught the overhead power line operators unprepared because they occurred in locations where the design did not expect any icing. The contribution summarizes the knowledge on the effect...
This paper deals with possibility of energy efficiency increase of annealing parts of rotors of gas turbines using induction heating. The efficiency is evaluated using mathematical model in SW Agros2D which allows 2D modeling of thermal and electromagnetic fields. The results are compared with the measurements. The influence of particular parameters (design the inductor, speed of rotation, supplying...
Ability to statistically evaluate a breakdown voltage of gas insulation comes to the fore, thanks to the effort to replace a SF6 with more environmentally friendly gas insulations. For this reason, there is an effort to improve statistical methods and their description of a breakdown voltages. In this article a way to improve ways of choosing an optimal distribution function for fitting performance...
This paper analyzes the mechanical vibration frequency spectra of a healthy squirrel cage induction machine and the identical machine operating under the dynamic rotor eccentricity. Radial vibrations are evaluated based on the experimental data in no-load and nominal load steady state operations. The main attention is paid to the rotational frequency and twice line frequency vibration components....
The research deals with construction of solar concentrator with photovoltaic panels and thermal circuit. As a part of this research there is a design of solar tracking system for solar concentrators. The use of concentrator with solar tracking system shows the performance of combined generation of electrical power and heat from solar radiation. The results of electrical and thermal measurements show...
This paper deals with diagnostic of composite insulation material which are currently used in high voltage appliances e.g. in large rotating machines — turbo or hydro generators. This composite is consist of calcinated mica paper, polyethylene terephthalate (PET) foil and epoxy-novolac resin. The insulation composite material with inhomogeneous structure was subjected to accelerated thermal aging...
This article presents two different methods revealing noise sources at turbo-generators. The first method is based upon an identification of amplitudes in a noise spectrum. The second presented method is based upon ISO standards, but was extended by MATLAB application displaying 3D graphs of recorded values.
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