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ELEKTRONIKA, ENERGETYKA, ELEKTROTECHNIKA ›
PRZEGLĄD ELEKTROTECHNICZNY › 2007-4
 

 Publikacja: Genetic optimisation of ANN-base decision units for protection purposes
Autor: Waldemar REBIZANT  Daniel BEJMERT  

This paper presents a novel technique for neural network structure optimisation based on genetic principles. Traditional heuristic approach to ANN selection is replaced with a powerful genetic algorithm, which allows obtaining compact yet efficient ANNs, depending on the defined optimisation index. The resulting ANNs are further used for solving chosen classification tasks in power system protec[...]

 

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POZOSTAŁE PUBLIKACJE W TYM ZESZYCIE:
2D magnetic rotational loss of electrical steel at high magnetic flux density
 
Shunji YANASE  Yoshiyuki MATSUNO  Shuichiro HASHI  Yasuo OKAZAKI  
Rotational magnetic loss in magnetic core materials has been examined on the direction of rotation at high magnetic flux density. Rotational losses differ remarkably over 1.5T in accordance to the decrease of phase difference between magnetic field H and magnetic flux density B. The rotational losses in clockwise or anticlockwise directions depend largely on inclination angle of magnetic filed s[...]
 
3D field analysis of amorphous modular transformer under short circuit
 
Bronisław TOMCZUK  Dariusz KOTERAS  
The low power transformers are used in many appliances. Traditional core of the transformers consists of thin sheets of high-grade steel, which are electrically separated by a thin coating of insulating material. Cold rolled, grain-oriented silicon steel is usually used to build of the core [2]. They can be stacked or wound. The amorphous ferromagnetic materials were manufactured in the end[...]
 
9th International Workshop on 1&2 Dimensional Magnetic Measurements and Testing
 
The 9th International Workshop on 1&2 Dimensional Magnetic Measurement and Testing was held in Czestochowa (Poland) - on September 18-19, 2006. From the earliest days the 1&2DM Workshop played a special and very important role as a meeting place and background of scientific achievements in the domain of ferromagnetic materials research and testing. Eight earlier Workshops have been held in [...]
 
A study on measurement methods of the magnetic properties of magnetic sheet and strip by means of a single sheet tester at audio frequency
 
Yusuke TAKARA  Jin ChUN-FENG  Yoshiyuki ISHIHARA  Toshiyuki TODAKA  
This paper presents a study on measurement methods of magnetic properties of magnetic steel sheet and strip by means of single sheet tester (SST) at audio frequencies (400Hz-10kHz). In this study, a SST for the high frequency measurement was investigated experimentally. The exciting coil to realize the nearly uniform flux density distribution in the longitudinal direction of a specimen was mainl[...]
 
A study on possible sources of errors of loss measurement under rotational magnetization
 
Helmut PFÜTZNER  Georg KRISMANIC  Hiroi YAMAGUCHI  Elisabeth LEISS  Weng-Chung CHIANG  
Losses for rotational magnetization may show high variations due to complex RSST designs. This paper discusses possible error mechanisms like the influence of planar eddy currents, the arrangement of sample in the yoke, pre-stress of sample, and - in special - direction effects. The latter are attributed to (i) small deviations from target values of B due to angle errors of B-sensor components a[...]
 
Analysis of condition data to support Asset Management decision processes
 
Edward GULSKI  Rogier.A. JONGEN  Jan MAKSYMIUK  
The today' state of power systems and their components needs to be led according the rules of Asset Management with the regarding of the necessary positive aspects of dependability covering the reliability, maintainability, availability and safety. To ensure the optimal level of profitability the information support of Asset Management decision level connected with the necessary applicatio[...]
 
Anisotropy influence on loss components in electrical steel sheets
 
Wojciech A. PLUTA  
Electrical steel is widely used as a magnetic core in such electrical devices as motors, generators and transformers. The efficiency of the devices is strongly influenced by the quality of electrical steel used for their core construction. The quality of the electrical steel sheets are described mainly by their saturation induction, specific power loss and magnetic anisotropy [1]. The last p[...]
 
Consequences of novel technological measures on the multidirectional magnetization performance of SiFe steel
 
Hiroi YAMAGUCHI  Helmut PFÜTZNER  Georg KRISMANIC  
Silicon iron sheets represent the most traditional and common type of soft magnetic materials. Applying a 3-phase excited rotational single sheet tester, multi-directional magnetic characteristics of five different types of material were analyzed in a comparative way. In special, the paper addresses 6.5% SiFe and novel 3% SiFe products with hyper-stress coating. As a main result, and contrary to[...]
 
Creep damage zone detection in exploited power plant tubes with magnetoacoustic emission
 
Bolesław AUGUSTYNIAK  Leszek PIOTROWSKI  Marek CHMIELEWSKI  Martin J. SABLIK  
The magnetoacoustic emission (MAE) is very sensitive to microstructure modifications that lead to changes in local energy barriers. This is the case of ferromagnetic steels exploited in power plant boilers, in which a progressive growth and coagulation of precipitates leads to decrease in the MAE intensity. Since the gas temperature distribution inside the boiler is not homogenous, the creep dam[...]
 
Development of simplified evaluation method of iron losses in actual stator cores of rotating machines
 
Norihisa IWASAKI  Takashi TODAKA  Masato ENOKIZONO  Yoshiyuki ISHIHARA  
This paper deals with a simplified iron loss evaluation method for actual stator cores of rotating machines. It is well known that the magnetic properties deteriorate in constructed cores due to conditions stressed by riveting and welding in manufacturing process and punching and shearing in cutting process of the silicon steel sheets and so forth. As a result, the iron losses increase in compar[...]
 
Diagnostic of distribution transformers by SFRA method
 
Miroslav GUTTEN  
Power transformers are key equipment for transfer and distribution of the electric power. Considering the significance of the power transformers in the electric system, their price and possible damages occurred by accidents, it is necessary to pay attention to their higher prevention. To prevent failure states of transformers, we perform different types of measurements. They shall illustrate a m[...]
 
Dynamic vector magneto-hysteretic E&S model taking into account of eddy current effect
 
Masato ENOKIZONO  Shinya URATA  
This paper deals with the dynamic vector magnetic hysteretic engineering model, “Dynamic E&S Model", which can analyze the effect of eddy current under the vector magnetic behavior. It is well known that the vector of magnetic field strength H is not always parallel to the magnetic flux density B in the core. Furthermore when the wave of magnetic flux is distorted, the eddy current occurs.[...]
 
Eddy current benchmark problem
 
Tomasz CHADY  Ryszard SIKORA  
This paper describes the proposal of a benchmark, which enables evaluation of various numerical methods applied to analysis of eddy current transducers. The extended experiments were carried out and results of measurements will be available for other researchers. Streszczenie. W artykule opisano propozycję testu porównawczego umożliwiającego ocenę różnych numerycznych metod analizy przetworników[...]
 
Effects of the stator punching on the iron loss of a high speed synchronous machine
 
Afef KEDOUS-LEBOUC  Thierry GAUTREAU  Thierry CHEVALIER  
In this paper, the additional iron loss due to the stator teeth punching is evaluated for a high speed permanent magnets machine. First, thanks to an original Grid structure, the B(H) curve and losses of the stator teeth are characterized from 50 Hz to 800 Hz and up to 1.7T. The results highlight the simultaneous influence of frequency and punching. The B(H) is particularly affected especially n[...]
 
Fault location on three-terminal lines associated with current differential relays
 
Eugeniusz ROSOŁOWSKI  Jan IŻYKOWSKI  Przemyslaw BALCEREK  Marek FULCZYK  Murari M. SAHA  
This paper presents an algorithm for locating faults on three-terminal power lines for inspection-repair purposes. The presented method has been tested and evaluated with use of fault quantities obtained from versatile simulations of faults with the software ATP/EMTP package. Results of fault location for the sample faults are delivered and discussed. Fault location accuracy is evaluated and an [...]
 
Influence of biaxial stresses on the magnetic behaviour of an iron-cobalt sheet - experiments and modelling
 
Olivier HUBERT  
This paper deals with the magnetic behaviour of an iron-cobalt thin sheet, submitted to biaxial stresses, from experimental to modelling aspects. Experiments are carried out thanks to a two layered cruciform specimen. Mechanical biaxial loading is ensured by four hydraulic jacks. Magnetic loading is ensured by single U-yoke. Measurements are carried out thanks to force, deformation, needle-B and[...]
 
Influence of digital resolution of measuring equipment on the accuracy of power loss measured in Epstein frame
 
Stan ZUREK  Philip MARKETOS  Philip ANDERSON  Anthony J. MOSES  
Digital and computerised equipment are widely used in the measurements of magnetic properties of soft magnetic materials. The manufacturers of digital data acquisition cards strive for improved accuracy and resolution of voltage measurements. The total accuracy of such devices is an important feature. However, high resolution and high sampling frequency of voltage measurement is not necessarily [...]
 
Influence of external stationary magnetic fields on measuring devices
 
Marian SOIŃSKI  Roman RYGAŁ  Wojciech PLUTA  Piotr KĘPSKI  Stanisław ŻUREK  
The paper reports experimental results, which demonstrate harmful influence of a single NdFeB magnet to some measuring devices. The NdFeB magnet used in the experiment (N42, D50 mm x h30 mm) is of average size available commercially. The experimental results allow concluding that a single NdFeB magnet is able to permanently damage an energy meter (Ferraris and with current transformer based on C[...]
 
LabVIEW as a tool for measurements, batch data manipulations and artificial neural network predictions
 
Stan ZUREK  Philip MARKETOS  Tony MOSES  
A package of programs written in LabVIEW 5.1 was used in a research project aimed at investigation of industrially important magnetic properties of magnetic cores: power loss (active and apparent) and permeability. The software was developed to perform three distinct roles: i) controlling the test conditions and performing measurements of power loss and permeability, ii) batch manipulation of th[...]
 
Limitation of earth-fault disturbances and their effects in medium voltage overhead lines
 
Józef LORENC  Aleksandra RAKOWSKA  Bogdan STASZAK  
The number of disturbances in medium voltage power network may be limited by particular carefulness in keeping up proper condition of power overhead lines exploitation or by more widely application of lines with covered (insulated) conductor in areas particularly susceptible on earth-fault disturbances. This disturbances may be easy limited with compensation of grounding capacitive currents, tha[...]
 
Loss decomposition under two-dimensional flux loci in nonoriented steel sheets
 
Carlo APPINO  Fausto FIORILLO  Carlo RAGUSA  
Energy losses have been investigated as a function of magnetizing frequency (DC - 200 Hz) and peak polarization value (0.25 T - 1.7 T) in non-oriented Fe-Si laminations under controlled alternating, elliptical, and circular flux loci. It is shown that, exploiting the concept of loss decomposition and the ensuing interpretative framework provided by the statistical theory of losses, a phenomenolo[...]
 
Low frequency magnetic shielding - present and future measurement
 
Anthony J. MOSES  Xiaojun DI  Philip ANDERSON  Philip BECKLEY  Hugh J. STANBURY  
Effective magnetic shielding from DC to power frequencies is of growing importance in many applications. Electrical steel is often used as a shielding material since it offers a cost effective solution over this frequency range. There is no standard or commonly accepted approach to measuring the shielding capabilities of different grades of sheet materials or accurately assessing their effective[...]
 
Magnetic properties of powder magnetic core under the stress
 
Kojiro HORI  Jin ChUN-FENG  Yoshiyuki ISHIHARA  Toshiyuki TODAKA  Kohei YOSHIKAWA  
The paper deals with deterioration of magnetic material properties by the stress, and thus changes of magnetic properties of powder magnetic cores under the stress were measured and analyzed. Result of a measurement, under the stress applied to the same direction as magnetic field, magnetic field strength increases linear and the increasing rate of core loss decreases as frequency becomes high. [...]
 
Measurement of core loss in single sheet tester
 
Teruyuki TAMAKI  Keisuke FUJISAKI  Masao YABUMOTO  Naoya HAMADA  
The core loss measured with the indirect magnetizing single sheet tester (SST) (in which a sample is placed between yokes and is indirectly magnetized by the yokes magnetized by magnetizing coils) roughly corresponds with that measured with the direct magnetizing SST used as standard (in which a sample is placed inside a magnetizing coil and is directly magnetized by the magnetizing coil). Both [...]
 
Modelling of three-limb wound magnetic core of three-phase transformer with disconnected neutral wire of primary winding
 
Rafal SOSINSKI  
The article concerns magnetic flux distribution in a three-limb magnetic circuit wound with amorphous ribbon using in a three-phase transformer. In article an algorithm of magnetic flux distribution in this magnetic circuit is presented. The algorithm concerns primary winding with disconnected neutral wire. The paper presents also the results of calculations performed on the basis of the propose[...]
 
Numerical analysis for the design of a magneto-elastic characterization device
 
Nicolas GALOPIN  Laurent DANIEL  Frédéric BOUILLAULT  Mondher BESBES  
A specific experimental platform, dedicated to magneto-mechanical behaviour measurement, is presented. The specifications of the characterisation system are listed and the technical choices made described. Numerical aspect concerning the conception stage, in order to match the specifications, are highlighted. Abstract. Opisano specjalny system do badania właściwości magnetomechanicznych. Przeds[...]
 
Preliminary study of two-dimensional magnetic property measurement of silicon steel sheet using stator of induction motor
 
Tetsuji MATSUO  Hiraku HIRAO  Masaaki SHIMASAKI  
A stator of a single-phase two-pole induction motor is used as a yoke for a rotational single sheet tester. Magnetic fields in the tester are simulated to evaluate the field uniformity in specimens and measuring coils. Simulation shows that simple circular and square specimens yield nonuniform magnetic flux density distributions. To improve the uniformity, a circular specimen with slits is propo[...]
 
Resistivity measurement on soft magnetic composite materials
 
Charles CYR  Philippe VIAROUGE  Jérôme CROS  Stéphane CLÉNET  
This paper presents the study of resistivity measurement techniques on Soft Magnetic Composites (SMC). These materials are heterogeneous at microscopic scale, covered with an oxide layer after curing and it is impossible to obtain thin samples from conventional compaction process. The influence of surface oxidation on measured electrical resistance is evaluated to about 10%. The importance of sa[...]
 
Single strip tester of magnetic materials with array of magnetoresistive sensors
 
Slawomir TUMANSKI  Slawomir BARANOWSKI  
The new design of Single Strip Tester device is proposed. Traditionally used coil sensors (tangential coil or Rogowski coil) are substituted by the array of magnetoresistive sensors. Such solution enables to simplify the tester (lack of integrating circuits or the compensation feedback). When sensors outputs are connected in series the output signal is significantly larger (about 500 mV/(kA/m) i[...]
 
Study of the counterclockwise/clockwise (CCW/CW) rotation problem with the measurement of 2-dimensional magnetic properties
 
Yoshitaka MAEDA  Shinji SUGIMOTO  Hiroyasu SHIMOJI  Takashi TODAKA  Masato ENOKIZONO  
In development of high-efficiency actuators, high magnetic flux density conditions are applied to achieve higher torque, weight reduction and size down. It is therefore very important to understand the magnetic properties under high magnetic flux conditions in the electrical steel sheets. However, it is very difficult to measure the magnetic field components under high flux density conditions ov[...]
 
The dependence of AC Barkhausen noise measurement on data acquisition parameters
 
Harshad V. PATEL  Anthony J. MOSES  Paul I. WILLIAMS  
Barkhausen noise (BN) is an important magnetic phenomenon in applications as diverse as magnetic recording and non-destructive testing of steels. It is very sensitive to changes in the microstructure and stress state of a material but interpretation of BN data is still problematic. Recent developments in digital data acquisition technology has led to greater sampling speeds and increased measure[...]
 

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