Browsing NTNU Open by Author "Ehya, Hossein"
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Advanced Fault Detection of Synchronous Generators using Stray Magnetic Field
Ehya, Hossein; Nysveen, Arne; Alfonso Antonino Daviu, Jose (Peer reviewed; Journal article, 2021)Many methods used for precise fault detection in salient pole synchronous generators (SPSGs) often require a priori knowledge of the healthy case, but this requirement impedes application of the methods since an accurate ... -
Analysis of Demagnetization Faults in a Permanent Magnet Synchronous Machine utilizing the Stray Magnetic Field
Bruu Ringdal, Sebastian (Master thesis, 2023)En permanent magnet synkronmaskin (PMSM) er en høytytende enhet på grunn av sin høye effektivitet og høye effekt til vekt forhold. Maskinen er imidlertid utsatt for skader som kan oppdages av en sensor som er montert på ... -
Analysis of Dynamic Eccentricity faults in a Permanent Magnet Synchronous Machine using stray flux
Laurhammer, Oscar (Master thesis, 2024)Omtrent all elektrisitet produsert i verden kommer fra generatorer, og motorer står for omtrent 30% av det totalte forbruket på verdensbasis. Å monitorere helsen på disse elektriske maskinene er ekstremt viktig. En ny ... -
Application of signal processing and machine learning tools in fault detection of synchronous generators
Skreien, Tarjei Nesbø (Master thesis, 2020)Deteksjon av feil i synkrongeneratorar med utprega polar er avgjerande for å sikre påliteleg produksjon i vasskraftverka der desse maskinene er lokalisert. Ei enkelt kortslutning mellom vindingar (ITSC på engelsk) i ... -
Artificial Intelligence-based Algorithm for Incipient Fault Diagnosis of Salient Pole Synchronous Generator using Multiple Sensor Fusion
Sørheim, Ole (Master thesis, 2021)Vannkraft representerer omtrent 90\% av all energi som produseres i Norge. Med et økende behov for ren energi er bærekraften til vannkraftprodusenter et hovedanliggende. Det er viktig å oppdage begynnende feil i ... -
Comprehensive Broken Damper Bar Fault Detection of Synchronous Generators
Ehya, Hossein; Nysveen, Arne (Peer reviewed; Journal article, 2021)Reliable operation of synchronous generators in hydroelectric power plants is crucial for avoiding unplanned stoppages that can incur substantial costs. The damper winding of salient pole synchronous generators (SPSGs) ... -
Condition Monitoring of Wound Field Synchronous Generator under Inter-turn Short Circuit Fault utilizing Vibration Signal
Ehya, Hossein (Chapter, 2020)In this paper, a novel frequency index for Inter Turn Short Circuit (ITSC) fault diagnosis of the Wound Field Synchronous Generator (WFSG) is presented by utilizing the air gap flux density and the total force density. The ... -
Detailed Magnetic Field Monitoring of Short Circuit Defects of Excitation Winding in Hydro-generator
Ehya, Hossein; Nysveen, Arne; Groth, I. L.; Mork, Bruce A. (Chapter, 2020)The excitation windings of the synchronous generators are generally reliable. However, electrical, mechanical, and thermal stresses that the machine is exposed to during its operation leads to the inter-turn and ground ... -
An Expeditious Algorithm for Identification and Classification of Rotor Faults in Salient Pole Synchronous Generators
Ehya, Hossein; Nysveen, Arne; Akin, Bilal; Gyftakis, Konstantinos N. (Peer reviewed; Journal article, 2023)Providing secure electricity depends on the reliable operation of the synchronous generators in power plants. Interturn short-circuit (ITSC) and dynamic eccentricity (DE) faults are among the most prevalent fault types in ... -
Image processing and machine learning application for fault diagnosis in synchronous motors
Johansen, Markus Fredrik (Master thesis, 2022)Synkronmotor feildiagnose gir innsikt i motorhelse og driftssikkerhet. Diagnostisk analyse utføres vanligvis ved å undersøke endringer i frekvenskomponenter. Denne oppgaven presenterer en bildebehandlings- og maskinlærings ... -
Intelligent Data-driven Diagnosis of Incipient Inter-turn Short Circuit Fault in Field Winding of Salient Pole Synchronous Generators
Ehya, Hossein (Journal article; Peer reviewed, 2021)This paper examines if machine learning (ML) and signal processing can be used for on-line condition monitoring to reveal inter-turn short circuit fault (ITSC) in the field winding of salient pole synchronous generators ... -
The Noise Effects on Signal Processors Used for Fault Detection Purpose
Ehya, Hossein (Chapter, 2020)Signal Processing plays a crucial role in addressing failures in electrical machines. Experimental data are never perfect due to the intrusion of undesirable fluctuations unrelated to the investigated phenomenon, so-called ... -
A Novel Health Monitoring System for Synchronous Generators using Magnetic Signatures
Ehya, Hossein (Doctoral theses at NTNU;2022:297, Doctoral thesis, 2022)The Ph.D. research work presented in this thesis deals with the health monitoring of synchronous generators utilized in hydropower plants. Although various methods are available for fault detection in synchronous generators, ... -
Online condition monitoring of synchronous generator using shaft signals
Hallingstad, Gaute Hagen (Master thesis, 2021)Nesten 100% av Norges elektrisitet produseres med vannkraft. Vannkraftprodusentene i Norge bruker i hovedsak generatorer av typen synkrongenerator med utpregede poler (SGUP). En sikker drift av disse generatorene er viktig ... -
Pattern Recognition of Inter-Turn Short Circuit Fault in a Synchronous Generator using Magnetic Flux
Ehya, Hossein; Nysveen, Arne (Journal article; Peer reviewed, 2021)This article provides a novel approach for discriminating the interturn short circuit (ITSC) fault in a salient pole synchronous generator (SPSG) based on the use of noninvasive sensors. A stray magnetic field is used as ... -
Pattern Recognition of Inter-Turn Short Circuit Fault in Wound Field Synchronous Generator via Stray Flux Monitoring
Ehya, Hossein; Nysveen, Arne; Nilssen, Robert (Chapter, 2020)This paper provides a novel approach to discriminate the Inter-Turn Short Circuit fault (ITSC) in salient pole synchronous generator based on the use of non-invasive sensors. A stray magnetic field is used as a non-invasive ... -
Performance Evaluation of Signal Processing Tools Used for Fault Detection of Hydro-generators Operating in Noisy Environments
Ehya, Hossein; Nysveen, Arne; Skreien, Tarjei N. (Journal article; Peer reviewed, 2021)Signal processing plays a crucial role in addressing failures in electrical machines. Experimental data are never perfect due to the intrusion of undesirable fluctuations unrelated to the investigated phenomenon, namely ... -
A Practical Approach for Static Eccentricity Fault Diagnosis of Hydro-Generators
Ehya, Hossein (Chapter, 2020)There has been an increased recognition that more attention needs to be paid to the condition monitoring of hydro-generators to provide a more reliable and sustainable power production. The static eccentricity (SE) fault ... -
Static, and Dynamic Eccentricity Fault Diagnosis of Large Salient Pole Synchronous Generators by means of External Magnetic Field
Ehya, Hossein (Peer reviewed; Journal article, 2021)Although synchronous generators are robust and long‐lasting equipment of power plants, consistent electricity production depends on their health conditions. Static and dynamic eccentricity faults are among the prevalent ... -
Time Domain Signature Analysis of Synchronous Generator under Broken Damper Bar Fault
Ehya, Hossein; Nysveen, Arne; Nilssen, Robert; Lundin, Urban (Chapter, 2019)Fault detection of electrical machines can avoid unplanned outage of the electricity generation at a power plant. Research related to a different type of faults in the synchronous generator, the broken damper bar (BDB) ...