Hernandez Guiteras, Joan
Total activity: 12
Research group
MCIA - MCIA Center Innovation Electronics
Department
Department of Electrical Engineering
Department of Electronic Engineering
E-mail
joan.hernandez-guiterasestudiant.upc.edu
Contact details
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Scientific and technological production
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1 to 12 of 12 results
  • Redesign process of a 765 kV AC substation connector by means of 3D-FEM simulations

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger; Romeral Martinez, Jose Luis
    Simulation modelling practice and theory
    Date of publication: 2014-03-03
    Journal article

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    This paper shows the capabilities of applying the three-dimensional finite element method (3D-FEM) for designing complex-shaped substation connectors to operate at 765 kVRMS AC. To check this methodology, it was analyzed the feasibility of upgrading a 400 kVRMS substation connector to operate at 765 kVRMS. However, both experimental and simulation results conducted according to the ANSI/NEMA CC 1-2009 standard concluded that although it passed the visual corona test, to ensure a wide safety margin it was desirable an improvement of the electrical behavior of such connector. It was shown that FEM results allowed detecting the peak stress points of the connector regarding the electrical stress thus allowing applying a corrective action. Then, two possible solutions were analyzed, i.e. the use of corona shields and the redesign of the connector assisted by 3D-FEM simulations. Results presented in this work show that both approaches have an excellent behavior in reducing the electric field strength on the connector surface. However, to make the final decision, the production cost of both alternatives was analyzed, thus favoring the redesign option. Next, the redesigned version of the substation connector was manufactured and tested. Experimental results conducted in a high voltage laboratory verified the effectiveness of the methodology and the potential of the proposed system to act as an advanced design tool for optimizing the behavior of complex-shaped substation connectors. Thus, this system allows assisting efficiently the design process while permitting constraining the economic costs

  • Contributions on corona onset voltage calculation for EHV and UHV substation connectors

     Hernandez Guiteras, Joan
    Defense's date: 2014-03-28
    Universitat Politècnica de Catalunya
    Theses

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    Les investigacions realitzades en aquesta tesi es va realitzar en el marc d'un acord empresa - universitat . L'objectiu d'aquesta investigació és determinar la tensió d'inici de l'efecte corona en geometries no uniformes per evitar la seva aparició, i així poder incidir en la fase de disseny del connectors de subestació de EHV i UHV i equipmanet auxiliar de línia instal·lats en condicions de funcionament, d'acord amb les normes internacionals . Per tant , s'ha prestat una consideració especial a l'estudi i el modelatge de l'efecte corona per assegurar que els connectors dissenyats es trobin gairebé lliures d'aquest efecte indesitjable . Degut a de la natura d'aquest acord marc, la investigació científica s'ha vist delimitada a l'aplicabilitat en un entorn industrial a fi d'obtenir la accreditació, segons les normatives internacionals, dels productes analitzats.Per tant , els temes tractats en aquesta investigació inclouen l'anàlisi de camps electromagnètics i els càlculs de l'efecte corona , sent aquest últim de gran importància en el disseny dels connectors de subestació per EHV i UHV . És objectiu d'aquesta tesi proporcionar augmentar el coneixement i aportar mètodes matemàtics apropiats per avaluar el comportament dielèctric de connectors de subestació per a sistemes de transmissió de EHV i UHV . En concret , s'ha destinat un capítol a la introducció a l'estat de la tècnica en connectors de la subestació i l'efecte corona, seguit d'un capítol adreçat a l'estudi dels camps elèctrics i magnètics creats pels connectors de la subestació i les equacions empíriques per al càlcul de l'effecte corona. A continuació, s'introdueix una descripció macroscòpica del corona a través de la descripció matemàtica del procés de ionització, tant des del cas estacionari com el transitori. Seguit de la descripció microscòpica a través de funcions de distribució estadístiques utilitzdes per descriure i calcular els paràmetres d'ionització del corona en l'aire . Finalment, es troba el capítol de tancament amb les principals aportacions de la investigació realitzada.

  • Determination of the corona inception voltage in an extra high voltage substation connector

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger; Casals Torrens, Pau
    IEEE Transactions on dielectrics and electrical insulation
    Date of publication: 2013-02
    Journal article

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  • Magnet shape influence on the performance of AFPMM in a torus configuration

     Saavedra Ordoñez, Harold; Riba Ruiz, Jordi Roger; Hernandez Guiteras, Joan; Romeral Martinez, Jose Luis
    International Conference on Power Engineering, Energy and Electrical Drives
    Presentation's date: 2013-05-16
    Presentation of work at congresses

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    The axial flux permanent magnet machine (AFPMM)is being increasingly demanded for special applications, particularly for transportation systems and concretely for inwheel applications. In this paper the effect of the magnets shape on the AFPMM performance has been analyzed by means of 3DFEM simulations. To this end the air-gap magnetic flux density, the back electromotive force (back-EMF), the cogging torque and the total torque waveforms of the analyzed AFPMMs with different magnets geometries have been studied and compared. The harmonic content of all these variables has been also analyzed. These analyses are carried out to find out the more suitable geometry for in-wheel applications and particularly to minimize the torque ripple of the AFPMM.

  • Redesign of a spherical corona shield for UHV substation connectors

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger; Saavedra Ordoñez, Harold
    International Conference on Power Engineering, Energy and Electrical Drives
    Presentation's date: 2013-05-15
    Presentation of work at congresses

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  • Feasibility analysis of reduced-scale air breakdown tests in high voltage laboratories combined with the use of scaled test cages

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger; Casals Torrens, Pau; Bosch Tous, Ricardo
    IEEE Transactions on dielectrics and electrical insulation
    Date of publication: 2013-10
    Journal article

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    Breakdown and corona extra-and ultra-high voltage tests are expensive, timeconsuming and require large and extremely costly high-voltage halls, of which there are very few worldwide. Some of these limiting requirements may be minimized by using test cages and by applying reduced-scale tests. In this work the feasibility of performing breakdown reduced-scale tests combined with the use of test cages is analyzed. For this purpose a three-dimensional finite elements based methodology is introduced to determine the geometric dimensions of the test cage in order to adjust the test voltage according to the allowable output voltage of a conventional high-voltage laboratory. To validate the findings of this work, breakdown tests of a full-scale 500 kVRMS substation connector and a 1:3 reduced-scale model using test cages are conducted in a highvoltage laboratory, which maximum allowable output voltage is of 125 kVRMS. Results from this work show that by using appropriately designed test cages and scaled versions of the test samples the results may be scaled with high accuracy.

  • Salinity effect on the corona onset for a 765 kV AC substation connector

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger; Sanllehi, Josep; Bosch Tous, Ricardo
    International Council on Large Electric Systems
    Presentation's date: 2012-08-29
    Presentation of work at congresses

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    Outdoor substations placed in coastal areas are affected by saline environments. In the technical literature it is found extensive information regarding insulations problems in presence of saline environments [1]. The accumulation of salts and other contaminants promotes the onset of partial discharges on the devices subjected to very high voltages. Insulators are also affected by this phenomenon. While rainfall has a cleaning effect on the insulator surface, humidity enhances the corrosion effect and degrades the performance of insulation [2], favouring onset conditions for partial discharge. Corrosion due to saline environments or dirt increases the roughness of the insulator surface, thus facilitating the appearance of partial discharges [3]. It is well known that the air pollution has a great impact on metals corrosion. Chloride ions are common in coastal environments, because seawater acts as a source of air mineralization. Deposition of chloride ions on metal surfaces intensifies metallic corrosion, thus degrading the conductor surface [4]. In this work the behaviour of a 765 kVRMS AC (line-to-line voltage) outdoor substation connector is analyzed when operating under both dry conditions and under wet saline environments by means of three-dimensional finite elements simulations (3D-FEM). FEM simulations show that the electric field strength in the connector surroundings does not exceed the electric breakdown strength for air under clean and dry atmospheric conditions when energized at its rated voltage, 765 kVRMS AC (line-to-line). These results are corroborated by means of experimental measurements carried out in a high-voltage laboratory. Both, the laboratory tests and the 3D-FEM simulations performed in this study concluded that the corona onset voltage is approximately 980 kVRMS AC (line-to-line voltage). Additionally, 3D-FEM simulations allow detecting the connector weakest points regarding to electrical stress. Hence, this software allows redesigning the connector geometry to optimize its performance, thus minimizing the corona occurrence risk and their associated unwanted effects. Additionally, FEM simulations performed under a saline atmosphere were carried out by including a thin conductive saline moisture layer acting as a wetting film on the connector surface. Results revealed that saline environments worsen the connector behaviour, thus favouring corona onset conditions and their related effects.Outdoor substations placed in coastal areas are affected by saline environments. In the technical literature it is found extensive information regarding insulations problems in presence of saline environments [1]. The accumulation of salts and other contaminants promotes the onset of partial discharges on the devices subjected to very high voltages. Insulators are also affected by this phenomenon. While rainfall has a cleaning effect on the insulator surface, humidity enhances the corrosion effect and degrades the performance of insulation [2], favouring onset conditions for partial discharge. Corrosion due to saline environments or dirt increases the roughness of the insulator surface, thus facilitating the appearance of partial discharges [3]. It is well known that the air pollution has a great impact on metals corrosion. Chloride ions are common in coastal environments, because seawater acts as a source of air mineralization. Deposition of chloride ions on metal surfaces intensifies metallic corrosion, thus degrading the conductor surface [4]. In this work the behaviour of a 765 kVRMS AC (line-to-line voltage) outdoor substation connector is analyzed when operating under both dry conditions and under wet saline environments by means of three-dimensional finite elements simulations (3D-FEM). FEM simulations show that the electric field strength in the connector surroundings does not exceed the electric breakdown strength for air under clean and dry atmospheric conditions when energized at its rated voltage, 765 kVRMS AC (line-to-line). These results are corroborated by means of experimental measurements carried out in a high-voltage laboratory. Both, the laboratory tests and the 3D-FEM simulations performed in this study concluded that the corona onset voltage is approximately 980 kVRMS AC (line-to-line voltage). Additionally, 3D-FEM simulations allow detecting the connector weakest points regarding to electrical stress. Hence, this software allows redesigning the connector geometry to optimize its performance, thus minimizing the corona occurrence risk and their associated unwanted effects. Additionally, FEM simulations performed under a saline atmosphere were carried out by including a thin conductive saline moisture layer acting as a wetting film on the connector surface. Results revealed that saline environments worsen the connector behaviour, thus favouring corona onset conditions and their related effects.

  • Voice coil inter-turn faults modeling and simulation

     Ruiz Illana, German; Ortega Redondo, Juan Antonio; Hernandez Guiteras, Joan
    Audio Engineering Society
    Presentation's date: 2012-04-29
    Presentation of work at congresses

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  • UHV connectors: state of the art

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger
    Date: 2011-11-09
    Report

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  • UHV connectors: optimization

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger
    Date: 2011-05-31
    Report

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    This document includes the optimization of substation connector geometries and protections for ± 800 kV DC and 1200 kV AC transmission systems. Connectors were obtained from SBI Connectors catalog using current geometries and materials. Parametric simulations have been carried out to determine the electric field on connectors surface as an indicator for corona performance. The document aims to provide the designer information about the relationship between design aspects and the corona effect.

  • UHV connectors: review 1

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger
    Date: 2010-04-10
    Report

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    In this document the state of art of UHV connectors is analyzed and the main factors such as geometry, corona and bundle among others are analyzed.

  • UHV connectors: review 2

     Hernandez Guiteras, Joan; Riba Ruiz, Jordi Roger
    Date: 2010-05-03
    Report

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