Test Whats new message.
Scheduled Maintenance on Monday 1/13/2025
Single article sales and account management will be unavailable from 5:00 AM - 7:00 PM ET (09:00 - 23:00 UTC). We apologize for the inconvenience.
Showing 1-25 of 37 results
- Sort
Sort By
Results
Design Solutions for Reducing AC resistance of High Frequency Windings
Lucian PETRESCU;Emil CAZACU;Valentin IONIŢĂ;Maria-Cătălina PETRESCU
2023 10th International Conference on Modern Power Systems (MPS)
Year: 2023 | Conference Paper |
Electromagnetic devices operating at high frequencies (hundreds of kHz) are becoming increasingly present in applications that regards switching and data transmission. In this sense, their windings are increasingly made of Litz type wires in several configurations. The present paper reveals a comparative FEMM study between the most used configurations. The numerical analysis of the skin and proxim...Show More
Frequency Dependent Hysteresis Curves of Fe and FeCo Magnetic Powder Cores
2023 13th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2023 | Conference Paper |
Magnetic powder cores are involved in many inductors used in power electronics, due to their tailored magnetic properties. This work investigates the hysteresis curves, measured by a standardized system, of some low-cost magnetic powder cores made from Fe and FeCo particles. The experiments show the limits of using classical equipment at higher frequencies for these samples that exhibit significan...Show More
Corrosion Experimental Investigation on Pipeline Connecting Pieces under Controlled Conditions
Lucian Petrescu;Aurel Chirilă;Dragoș Deaconu;Emil Cazacu;Valentin Ionita;Maria-Catalina Petrescu
2023 13th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2023 | Conference Paper |
The corrosion process of transport pipelines of oil and petroleum products represents a particularly important aspect in the distribution and transport process of those products. Over the last decades, solutions have been sought to reduce the effects of corrosion that encounters in steel or grey cast-iron pipelines. The present work reports a series of experimental data obtained over several month...Show More
A Simple and Low-Cost Equipment for Derating the Power Distribution Transformers Subjected to Distorted Operating Currents
2021 9th International Conference on Modern Power Systems (MPS)
Year: 2021 | Conference Paper |
The paper suggests a simple and affordable device that allows the fast and continuous in-situ calculation of operating parameters of the in-service distribution transformers that supply nonlinear loads. The proposed equipment is a system with an architecture based on two interconnected modules, mainly realized of electronic boards. The first one monitors and acquires the current power quality para...Show More
Numerical Analysis of Electrode-Pipeline System for Reducing the Corrosion Process
Bogdan Chesca;Valentin Ionita;Lucian Petrescu;Emil Cazacu;Maria-Catalina Petrescu
2021 9th International Conference on Modern Power Systems (MPS)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
The corrosion process for underground pipes is a particularly important aspect for those who deal with the distribution of gases or other products. The need for an anticorrosion cathodic protection installation proves to be essential for prolonging the service life of the pipes. One of the possible solutions is a system for injecting a current into an electrode placed near it. This paper analyzed ...Show More
Coils-Based Measurement System for Soft Magnetic Materials
2021 12th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
Magnetic materials are experimentally characterized by various methods, using a large palette of sensors and complex laboratory devices. A laboratory device, based on a coils system and a closed magnetic circuit, is presented in this article, underlining the technical consequences of the coils design and their positioning regarding the studied magnetic core. The coils calibration includes analytic...Show More
Ferroresonance Analysis of Particular Iron Core Transformers
2021 12th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2021 | Conference Paper |
Cited by: Papers (3)
The paper quantitatively investigates the ferroresonance phenomenon for a specific class of single-phase and small power transformers. These low-voltage devices that usually exhibit an E+I iron-core shape geometry, are to be commonly found in actual electric and electronic installations. Their operation under no- or light load conditions in circuits that also include capacitive elements, favors th...Show More
Experimental Study of Shielding Composite Materials for Protection of Computer Systems
Valentin VELICU;Vlad BUTNARIU;Bogdan TRIP;Alexandru BOITAN;Valentin IONITA
2021 12th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
This paper studies the electromagnetic shielding properties of various composite materials with potential to be used in shielding computer systems. As data protection becomes an increasingly important issue, shielding computer systems that carry critical information is one of the methods by which this information can be protected. Therefore, in this paper were studied composite shielding materials...Show More
Risk Priority Number vs Action Priority in Electrical Systems
Lucian Petrescu;Maria-Catalina Petrescu;Emil Cazacu;Valentin Ionita
2021 12th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2021 | Conference Paper |
FMEA (Failure Mode and Effect Analysis) is an important tool in evaluating a product or service either before it is made or prior to its market placing. Its purpose is to reduce any subsequent expenses due to defects. The principle of this tool says that it is cheaper to prevent than to repair. In the automotive industry, FMEA is widely implemented, but there is a clearer trend in recent years to ...Show More
Experimental Study of Radiated Compromising Emanations for Computer Monitors
Valentin Velicu;Alexandru Boitan;Vlad Butnariu;Bogdan Trip;Mihai Iulian Rebican;Valentin Ionita
2019 6th International Symposium on Electrical and Electronics Engineering (ISEEE)
Year: 2019 | Conference Paper |
Cited by: Papers (1)
To highlight the necessity of applying additional protective measures to the equipment that processes critical information, comparative measurements were performed for two display devices, one commercial and the other shielded, in order to detect the compromised emanations that they generate. The amplitude of the electromagnetic signals generated by the two displays were compared and their comprom...Show More
Simplified Design of a Low Frequency Search Coil Magnetometer
Madalina BUCUR;Georgiana ROSU;Adelina BORDIANU;Lucian PETRESCU;Valentin IONITA;Octavian BALTAG
2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2019 | Conference Paper |
Cited by: Papers (1)
The paper describes in detail the process of designing a magnetometer with induction coil and ferromagnetic core. This includes the analysis of core material parameters and the effect of heat treatment upon the magnetization characteristic, the choice of core dimensions based on the minimization of the demagnetization factor, determining the coil electrical parameters for both configurations, and ...Show More
Impact of Steinmetz Coefficients Variance for FeSi Laminate Magnetic Cores
2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)
Year: 2018 | Conference Paper |
Cited by: Papers (1)
An experimental study on the magnetic losses estimation by Steinmetz formulas for non-oriented grains FeSi laminated cores is analyzed. The influence of the involved measured data on the Steinmetz coefficients is presented, detailing the impact of the fitted parameters on the estimated magnetic losses. The experimental setup uses a laminated ring with primary and secondary coils, connected to a co...Show More
Effect of voltage harmonics on iron losses in magnetic cores with hysteresis
2018 18th International Conference on Harmonics and Quality of Power (ICHQP)
Year: 2018 | Conference Paper |
Cited by: Papers (5)
The effect of distorted voltage waveforms on the iron losses, considering the magnetic hysteresis, is quantitatively studied, using an accurate losses separation method and a time-integration for each component. The model parameters, including the Preisach hysteresis function, are identified by magnetic measurements. A case-study, implying measured electric power quality data in a metal processing...Show More
Nonsinusoidal load current effect on the electrical and thermal operating parameters of oil filled power distribution transformers
Emil Cazacu;Maria-Cătălina Petrescu;Valentin Ioniţă;Lucian Petrescu
2018 18th International Conference on Harmonics and Quality of Power (ICHQP)
Year: 2018 | Conference Paper |
Cited by: Papers (8)
Most of the in-service power distribution transformers from the industrial electric facilities were designed to operate under pure sinusoidal state conditions. Nevertheless, the majority of the loads from modern electric installations are intrinsically nonlinear and consequently, they generate nonsinusoidal currents. These high-order harmonics (present into the current waveform spectrum) have a ne...Show More
Improved prediction of hysteresis losses in electrical machine cores
Valentin Ioniţă;Lucian Petrescu;Emil Cazacu;Eros-Alexandru Pătroi;Eugen Manta
2017 International Conference on Modern Power Systems (MPS)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
A new formula for the hysteresis losses prediction at higher magnetic fields is proposed. Its efficiency is tested both for sinusoidal and non-sinusoidal waveforms, applied for non-oriented magnetic FeSi sheets of various sorts, which are used for electrical machine cores. The model parameters are identified starting for laboratory measurements made by a standardized single sheet tester (SST). The...Show More
Flux-current description of some particular iron core devices
2017 International Conference on Modern Power Systems (MPS)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
The paper presents the analytical solution for the i-Φ magnetic characterization for two different types of iron-core devices (small rated power inductors, reactors or chokes) widely encountered in electronic circuitry. The proposed method bases on the fundamental laws of electromagnetism and a special adopted function for the H-B curve description of the core laminations. The manufacturer data ar...Show More
The actual energy efficiency requirements generated a large usage of the power electronic converters for driving asynchronous motors in numerous industrial facilities. The associated power quality issues of these adjustable speed drives, especially harmonic currents, adversely affect the power distribution transformers by increasing their losses and decreasing their life time expectancy. According...Show More
Steinmetz' parameters fitting procedure for the power losses estimation in soft magnetic materials
Lucian Petrescu;Valentin Ionita;Emil Cazacu;Catalina Petrescu
For different sorts of electrical sheets, the magnetic losses separation using Bertotti method was performed. Using a fitting procedure, the Steinmetz coefficients were approximated. For each parameter, an analytical expression regarding the measured values was determinated. Finally, a comparison between the measured data and the predicted losses was made. The modeled losses are quite close to the...Show More
Ferroresonance modes determination of single-phase toroidal transformers
2017 15th International Conference on Electrical Machines, Drives and Power Systems (ELMA)
Year: 2017 | Conference Paper |
Cited by: Papers (6)
The actual high incidence of the low-loss power transformers in the modern electric and electronic installations, increase the risk of the ferroresonance occurrence. This could be commonly triggered by a capacitive switching of the transformers. Consequently, significant overvoltages and overcurents are experienced by all the installation components, jeopardizing their proper functionality. Additi...Show More
Losses and temperature rise within power transformers subjected to distorted currents
2017 15th International Conference on Electrical Machines, Drives and Power Systems (ELMA)
Year: 2017 | Conference Paper |
Cited by: Papers (15)
The currently high energy efficiency demands and control requirements impose an extensive usage of power electronic devices and circuits in both domestic and industrial applications. These intrinsic nonlinear loads generate prominent level distortion of the electric current waveforms, which lead to additional losses and thermal stress within the power supply distribution system. Thus, due to the s...Show More
An efficient method for investigating the ferroresonance of single-phase iron core devices
2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2017 | Conference Paper |
Cited by: Papers (11)
The paper presents a fast and efficient method for determining the solutions of the ferroresonant circuits generated at the switching of different single-phase low-voltage iron-core devices. These are widely encountered in modern electric installations as no-loaded power transformers, magnetic choke or shunt reactors. The here suggested procedure basically relies on the solutions of the nonlinear ...Show More
Comparison between non-oriented silicon iron sheets used for electrical machines
Lucian Petrescu;Emil Cazacu;Valentin Ioniţă;Catalina Petrescu
2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2017 | Conference Paper |
Cited by: Papers (4)
The aim of this paper is to evaluate 4 sorts of non-oriented (NO) sheets used for electrical machines. The measurements were performed using Single Sheet Tester. The magnetic materials were evaluated for different values of the peak magnetic polarization and for a range of frequencies from 10 to 200 Hz. Finally, using the Steinmetz' method, the specific magnetic losses were predicted for an operat...Show More
Remarks about the magnetic characterization of magnetite nanopowders
2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2017 | Conference Paper |
A study on the possible corrections of the measured magnetization curves for magnetite (Fe3O4) nanoparticles is presented. The same nanopowder was measured using various sample shapes (cylinders, thin films) allowed by the VSM holders, which impose a specific packing fraction, and under different orientations of the applied magnetic field. Demagnetizing factors and effective field approaches are t...Show More
Influence of harmonics' initial phases on magnetic losses in non-oriented grains FeSi sheets
2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)
Year: 2016 | Conference Paper |
Cited by: Papers (3)
The estimation of magnetic losses in a non-oriented grains FeSi sheet by a time-dependent method is used in the paper for underlining the influence of each harmonic initial phase. The initial phase of the first harmonic, usually indicated by a power analyzer to be zero, is very important for the signal shape, the losses being dependent on this parameter. The paper proves that THD and the harmonic ...Show More
Numerical and experimental investigations on the energizing of miniature iron core transformers
2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2015 | Conference Paper |
Cited by: Papers (3)
The paper analysis both numerically and experimentally the no-load miniature power transformer energizing process. The transient state characterization targets the predetermination of the main inrush current features: amplitude, duration and waveform signature. The whole quantitative investigation is carried out on a particular core-shaped devices (E+I), widely used in small power applications. Th...Show More
IEEE Account
Purchase Details
Profile Information
Need Help?
- US & Canada: +1 800 678 4333
- Worldwide: +1 732 981 0060
- Contact & Support
- About IEEE Xplore
- Contact Us
- Help
- Accessibility
- Terms of Use
- Nondiscrimination Policy
- Sitemap
- Privacy & Opting Out of Cookies
A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.
© Copyright 2025 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.