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The work is considered parametric eddy current transducer included in the circuit with the shock excitation. For the purpose of study with software MagNet created a model that consists of parametric eddy current transducer and studied object. For the purposes of eddy control has been studied the distribution of eddy currents induced in the conductive object of research exciter included in the circuit...
If we have applied all safety and security measures, but there are still risks to health and lives of workers, good training of workers represents a significant measure for their safety. A well-designed training, continuing training and the constant checking are only way to reduce the risk in the workplace and emergency response.
To reduce risks in the workplace, it is necessary to apply a number of different measures. Design and optimization technology, as well as selection of materials, is the first measure that must be applied in the workplace.
The paper presents design considerations and a loss analysis of dc chokes in kW range, realized by different magnetic materials. Five designs under the same input parameters are realized with three different materials: ferrite (3F3), powder (sendust MS) and amorphous material (Microlite 245). An optimal design procedure is considered aimed at minimizing losses and volume of the component. A set of...
This paper presents a design methodology for an inductor for induction heating device. The proposed design algorithm provides optimal selection of the inductor pipe, size and dimensions. Electrical parameters of the coil are also derived. The main steps of the design procedure are described. The methodology steps are in accordance with the specific assigned operating parameters and the geometric dimensions...
This paper discusses an idea for developing a safety message delivery system. Messages are displayed depending of which apparatus is near the user and they consist of hints for correct operation with the equipment, safety instructions and control panels. The idea is based on Bluetooth LE and Android smart devices.
The temperature distribution in the transformer interior is a significant parameter governing a transformer's performance and life expectancy. In the perspective of the user, temperatures in a transformer are important to determine the amount and duration of over load it can sustain, and to estimate the effects on the life of the transformer by operation at various temperatures. This paper presents...
The flow of the lightning current through the grounding grids of electrical substations produces impulse processes in the soil. The authors have developed a simulation model of the grounding, considering the wave processes. To expand the model, determination of the maximum possible touch voltage in these processes have to be done. This report proposes a mathematical model, describing the dependence...
The direct stroke of a lightning in the power lines is a major cause of failure of the linear isolation and the disruption of the normal operation of electrical grids. In the power lines for high voltages prevail the reverse discharges — from atmospheric overvoltages, struck on the towers or on the ground wire near the towers. In order to be taken the necessary precautions, researches should be made,...
This paper presents a study of the energy transfer of piezoelectric polymer transformers. Several transformer constructions are discussed, evaluated and compared. Analysis and experimental studies for all of the constructions are presented. Results highlighting the parameters of the transformers are provided. A comparison based on frequency, efficiency and geometrical properties is made. As a result,...
This paper deals with the use of multiphase induction machines in renewable energy applications such as wind energy conversion. Firstly, the dynamic model of the turbine and Dual Star Induction Generator (DSIG) is given and then a simple control strategy is applied to ensure a constant DC bus voltage under variable speed and at different loads. The system control is made based on indirect rotor flux...
This paper is dedicated to a new macro-theory of electromagnetics. It is an attempt to break the classic approach for introducing the basic concepts, quantities and laws. A model of the magnetic field is proposed, accompanied by the use of new quantities and concepts, through which the existing electromagnetic laws can be perceived in a completely natural way, which the classic theory does not offer...
The paper presents a finite element modeling based study of various heat sink designs. The main aim of the study is to determine and evaluate solutions with improved heat dissipation by utilization of natural convection. Seventeen different cases both classical and proposed by the authors are studied, where each case is examined under three different heat source (in the case with the proposed study...
Induction heating and melting is a widely used thermal treatment method. It is associated with small losses of electric power and it's also enables local heating at specific points of the item. In using three-phase inductors at industrial frequency, a problem occurs associated with the occurrence of a rotating magnetic field. The construction suggested in this publication eliminates this problem....
The aim of this work is investigating the possibilities for creation of energy effective LED modules with special spectral characteristics and radiant flux, suitable for greenhouse applications. Combinations of different types of LEDs and LED modules are tested to achieve spectral power distribution proper for particular types of plants. Proper thermal management analysis and experimental investigations...
In this paper the possibilities of the variational approach for analysis of transient processes in electric circuits are presented. A special methodology for optimization of the solutions by the help of the formulas of Newton-Cotes for numeric integration and the balance of powers is introduced, giving the chance to increase the precision of the solutions.
Aluminum Conductor Steel Reinforced (ACSR) is usually applied for the power overhead transmission or distribution lines. Electric characteristics of applied materials, like aluminum and steel conductivity values, are always provided by the manufacturers, but not the ACSR steel core permeability. In order to investigate how important the steel core permeability is, this paper deals with the influence...
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