<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> An accurate mathematical model has been developed in order to describe electrical and geometrical factors affecting operation DC transfer characteristics of the self-oscillating fluxgate current sensor. The description sensor circuit is based on a continuous function that approximates magnetization curve used transformer core. differential equation adopted analytically solved offering fundamental...

In this paper, we propose online monitoring systems for uninterrupted noncontact temperature measurement and detection of overheated water-cooled rotor poles all ten hydrogenerators in the hydropower plant Djerdap 2 on Danube. The proposed stand-alone are based remote infrared recognition hot pole surface rotor. main parts each system measuring device, industrial PC with SCADA interface, virtual instrument, related database. device is installed front generator consists optical, analog,...

Classical DC current transformer, based on a linear amplifier as compensating amplifier, is well known power inefficient device. If the replaced with switching counterpart, significant saving can be achieved. A natural choice for replacement found in half-bridge class-D amplifier. However, prone to bus-pumping effect, and direct cannot performed straightforward manner. This study presents an analysis of consumption issues irregular behaviour caused by effect. For case measurement, main are...

This paper looks toward theoretical and practical aspects of a new 2-D direction finding method. It promotes idea for multichannel azimuth estimation based on amplitude difference signal acquired adjacent antennas. The essence the method is simple hardware consisting small size microwave (7-19 GHz) antennas equipped with detectors, frequency synthesizer, low power mixed-signal processing hardware, efficient firmware. Significant advantage proposed approach simplified detection infinitely...

The generalized traveling current source return stroke model (GTCS), Cvetic and Stanic [1995] is extended to take into account reflections occurring at ground the upper end of lightning channel, as well attenuation along channel. reflection factor top pulses are taken from TCS model, Heidler [2007]. Current sources placed activated length represented by channel discharge function introduced in GTCS model. Multiple give rise waves moving up down total composed according original reflected...

Power transformers are constantly exposed to mechanical, thermal and electrical stresses during operation. In this paper, the authors propose an improved aging model of power by adding impact mechanical deteriorations. current practice, deformation dislocation windings core not sufficiently distinguished as components that influence transformer. Hence, was expanded with a functional block contains several typical failures in order emphasize their on lifetime well. The used Frequency Response...

A market offers more and High-Level Synthesis (HLS) tools used for complex digital system design by applying abstract models. In this paper, using SystemC, HLS programmable logic, an algorithm calculating zero, first second order image moments was implemented on several approaches. Effects accomplished different optimization methods coding style were analyzed. efficiency hardware implementations compared with of the same general purpose processor.

The paper presents a simple and an efficient design method of Proportional-Derivative (PD) controller. This type controllers has been extensively used in industry e.g. to eliminate position error at robotic manipulators other mechatronic systems. Analytical tuning formulas PD controller for typical representatives industrial processes terms single parameter λ have derived. desired performance robustness indices the closed-loop system are achieved by suitable selection adjustable λ....

A modern challenge in electrical engineering education is to keep the math at a sufficient level, with goal find an optimal balance between calculus competence and operative skills needed for real-life technical applications. It not uncommon that some gaps emerge during this quest, which makes it difficult undergraduates entirely understand topics related on prior knowledge. This paper aims draw attention several important moments concerning total response of Continuous Linear Time Invariant...

This paper presents a switched capacitor technique for bus-pumping compensation in half-bridge class-D amplifier. The proposed approach, addition to the almost complete reduction of effect, allows amplifier preserve maximum energy efficiency. studied hardware implementation demonstrates its advantages high efficiency, simple circuit, and low cost. principal design operating principles are analyzed described. experimental static characteristics time-domain waveforms shown verify feasibility.

This paper presents a solution for hardware platform signal acquisition with variable sampling rate. The system is designed to work in noisy environment near power distribution grid frequency.

Unlike the systematic/algorithmic approach, heuristic approach to professional design of technical systems is based on experience, intuition and exploitation readily available information. The main value information precisely that it "readily available" - does not have be reliable or applicable. When systematic satisfactory for some reason, certainly useful, but with significant caution indispensable experience designer. Unfortunately, flood Internet has brought a false self-confidence...

A generalized lightning traveling current source (GTCS) return stroke model has been used to examine the characteristics of channel corona sheath surrounding a thin core. The process is modeled with positive charge coming from core discharging negative leader in sheath. that predicts motion derive radius vs. time expressions during stroke. According model, previously proposed by Maslowski and Rakov [2006] et al. [2009], it consists two zones, zone 1 (surrounding net charge) 2 charge). We...

The paper analyzes the consumption performance of DC current transformers based on linear class B, and half bridge classD compensation amplifiers, as well self-oscillating flux gate push-pull source–sink output stages.Compensation source-sink stages are used to generate feedback in order compensatemagnetic magnetic concentrator core, produced by electrical flowing through a conductor under measurement. Thefocus analysis is investigation conditions for appearance bus-pumping effect which all...

This paper presents comparative analysis of two different memory efficient hardware architectures for 5/3 two-dimensional (2-D) inverse discrete wavelet transform (DWT). The first one is based on lifting filters, while the second non-stationary filters. Both require lowest size compared to other published in literature, but differs terms used logic resources. are suitable implementation JPEG 2000 image decoder which uses DWT

Time-frequency analysis of the ionospheric whistler signals is presented. Prior to time-frequency analysis, disturbances caused by power-grid influence and tweek sferic are filtered using frequency domain time filtering, respectively. Instantaneous law then estimated. S-method used as a representation in order obtain highly concentrated without undesired crossterms. The presented method applied real-life signals.