Internal Characterization of Magnetic Cores, Comparison to Finite Element Simulations: A Route for Dimensioning and Condition Monitoring

Abstract

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de > REPLACE THIS LINE WITH YOUR PAPER IDENTIFICATION NUMBER (DOUBLE-CLICK HERE TO EDIT) < 1  Abstract-Magnetic cores are typically used in every stage of an electrical energy production and distribution chain.Local defects, including edge burrs and interlaminar faults, are detrimental for system performance and should be detected swiftly to ensure high reliability and durability. Real-time magnetic core condition monitoring is a promising solution for rapid fault detection. However, similar to dimensioning or performance evaluation, this monitoring has always been performed through averaged magnetic properties, which limits efficiency. In this domain, significant progress is forecasted by achieving precise local measurements. In this study, an innovative solution is proposed to measure local magnetic properties, which is adapted to real-time monitoring and magnetic circuit evaluation. The proposed sensor is a one-piece device that is flat enough to be placed noninvasively between the laminations at distinct positions in the magnetic core. It measures the magnetic excitation and induction fields in two dimensions, which can be used as local inputs for realtime condition monitoring. In this manuscript, the proposed sensor was first detailed, experimental results were provided, and finite-element simulations were performed. The sensor capability was validated both experimentally and through simulation. The results of this study contribute to the development of an intelligent magnetic core that includes an effective real-time monitoring system. The study provides a local validation of the most advanced highfidelity simulation method, which could be used to predict the responses of magnetic cores and electromagnetic converters to defects of various natures, as well as geometrical and property changes.

Magnetic Signatures and Magnetization Mechanisms for Grinding Burns Detection and Evaluation

“…In this study, surface B(H) hysteresis cycles were plotted. The pseudo induction B was obtained using the Magnetic Needle Probe (MNP) method [ 34 , 35 ]. The tangent surface H was measured with a Hall effect sensor (please note that it was also the case for the previous mechanisms).…”

An Enhanced Analysis of Inter-Laminar Faults in Magnetic Cores With Grain Oriented Electrical Steels for Fault Diagnosis and Condition Monitoring: Theoretical Background and Experimental Verification

“…Most of the existing techniques are mainly developed for stator cores of turbo generators. Nevertheless, they can be further evolved and implemented for power transformers [16][17][18]. Core quality assessment of power transformers is mainly performed by measuring overall power losses of the core, known as no-load losses, as defined by the British standard BS EN 60076-1-2011 [19].…”

A Modified Adaptive Droop Control for Improved Load Sharing in Microgrids Considering DG Boundary Limits

“…VSIs are considered the basic component in the DG applications because they do not need any external loops to maintain the synchronization. In addition, they can be connected in parallel with other inverters to create isolated or independent microgrids using frequency and voltage droops [11,12]. Furthermore, ridethrough capability and power equality capability are very essential issues in the modern power production systems which can be given by the control of the VSIs that make it practical solution [13].…”