95 research outputs found
Dataset for publication: Design and Characterization of a Magnetic Loop Antenna for Partial Discharge Measurements in Gas Insulated Substations
No full textData set belonging to the IEEE Sensors Journal paper with DOI: 10.1109/JSEN.2021.3089084
Mier Escurra, Christian; Mor, Armando Rodrigo; Vaessen, Peter
Design and Characterization of a Magnetic Loop Antenna for Partial Discharge Measurements in Gas Insulated SubstationThis project 19ENG02 FutureEnergy has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation programme
An investigation into the dynamics of partial discharge propagation in mineral oil based nanofluids
No full textRecent studies present a model which assumes that conductive nanoparticles can reduce the speed of the positive streamer propagation in mineral oil due to electron trapping at the particle surface. Time resolved partial discharge measurements can be used to evaluate the discharge dynamics and to verify this hypothesis. A special measurement setup was built to enable the recording of the discharge dynamics. In this study, the effect of nanoparticles with different conductivities on the discharge dynamics of mineral oil is investigated. The time resolved current shapes of partial discharges in nanofluids and mineral oil are compared. To understand the effect of the conductivity of the nanoparticles on the partial discharge dynamics of mineral oil, nanoparticles with two different conductivities are synthesized with mineral oil. The two types of nanoparticles are silica and fullerene. The host fluid used in this study is Shell DialaS3ZXIG mineral oil
Design of a Partial Discharge Test Platform
No full textDesign of a Partial Discharge Test Platform author: Daniel Harmsen thesis advisor (mentor): Dr. Armando Rodrigo Mor abstract: Partial discharge (PD) measurements are an effective tool for insulation diagnostics and assessment. Therefore, a good understanding of these PD measurements is an essential part of an electrical engineer’s background knowledge. During this research project a PD test platform was designed and build for electrical PD detection. The setup included artificially created defects for six different types of PDs, with origins in positive and negative corona, internal discharge, floating electrodes, free-moving particles and surface discharge. These defects were designed to have a partial discharge inception voltage (PDIV) of around 10kV, and could easily be connected or disconnected from the setup. Therefore, it was possible to measure individual defects or a combination of them. This PD test platform was used during this research project to characterize the different PD types (single and multiple), and as a check for testing new clustering and pattern recognition techniques. In addition, the platform could also be used as a test platform for educational purposes and to train people and test equipment. In this thesis research project, the “initial step” towards PD defect origin recognition for AC voltage without any phase dependency was conducted with the use of time-resolved partial discharge (TRPD) analysis. This thesis shows that it is possible to conduct the time analysis and recognition for AC voltage for the artificially created defects. From the analysis in this thesis, it can be concluded that the TRPD analysis for PD recognition under AC voltage is as good as, or even better than, phase-resolved partial discharge (PRPD) analysis. For most of the data analysed, the TRPD analysis provides the same results compared to the PRPD analysis. However, further checking is needed, such as validating the findings with mathematical models. The thesis goals are to build a setup suitable for the research, determining the optimal combination of hardware/software to discriminate among different types of defects, and to realize experiments to validate the design.Electrical Engineering, Mathematics and Computer ScienceDC&E
Analysis of the arcing process in on-load tap changers by measuring the acoustic signature
No full text
Medida de descargas parciales en aisladores poliméricos
No full textProyecto ConfidencialRodrigo Mor, A. (2007). Medida de descargas parciales en aisladores poliméricos. https://riunet.upv.es/handle/10251/36494.Archivo delegad
The Effect of Humidity on the AC Breakdown Strength of C4-FN/CO2 (5%/95%) and the Partial Discharge Behavior of Corona Under Different Operating Conditions
No full text[EN] SF6 is being phased out of the electrical grid as it is a strong greenhouse gas. A "green" alternative to SF6 is fluoronitrile (C-4-FN). The dutch transmission system operator (TSO) TenneT wanted to investigate the electrical behavior of this "green" alternative as a pilot-gas insulated line (GIL) filled with C-4-FN/CO2 (5%/95%) experienced multiple electrical breakdowns during the site acceptance tests (SATs). TenneT hypothesized that the breakdown was caused by the effect of (too much) humidity in the gas. Therefore, the ac breakdown behavior of the gas mixture has been researched under different amounts of humidity and operating pressures. This article also makes a small introduction on how humidity affects partial discharge (PD) behavior of corona, which is often a breakdown indicator. The results of this research conclude that humidity affects the ac breakdown strength. An increase in humidity in the gas results in a decrease in the ac breakdown strength. Moreover, the field configuration determines the amplitude of the impact. The impact of humidity on the ac breakdown strength in a homogenous field is substantially more compared to an inhomogeneous field, where the impact can almost be ignored. Yet, the effect of humidity decreases as the operating pressure increases. The phase-resolved PD pattern and PD characteristics of corona in a C-4-FN gas mixture also differ with humidity. On the other hand, the PD inception voltage did not change with the humidity content. As a result of the findings in this research, further research is proposed toward the affected breakdown mechanism and more various PD behavior.Veldhuizen, E.;Mier Escurra, C.;Lathouwers, A.;Rodrigo Mor, Armando;Ghaffarian, M. (2024). The Effect of Humidity on the AC Breakdown Strength of C4-FN/CO2 (5%/95%) and the Partial Discharge Behavior of Corona Under Different Operating Conditions. IEEE Transactions on Dielectrics and Electrical Insulation. 31(5):2503-2510. https://doi.org/10.1109/TDEI.2024.3390649S2503251031
Nueva metodología de la medida de descargas parciales en cables de alta tensión. Desarrollo de un sensor capacitivo de gran ancho de banda
No full textEn la actualidad la medida de descargas parciales constituye una herramiento eficaz para el diagnóstico de fallos de aislamiento. La presente tesis está centrada en los diferentes métodos de ensayo de descargas parciales en cables de media y alta tensión. Principalmente se ha estudiado la influencia de los diferentes métodos de ensayo en la evaluación de la carga de los pulsos de descargas parciales en ensayos off-line (ensayos en lso que se saca el cable fuera de servicio).
La tesis analiza las particularidades de los métodos convencionales, y de los nuevos métodos o métodos no convencionales.
Los métodos convencionales, empleados desde los años 60 en laboratorios de alta tensión, emplean filtros paso-banda como herramienta para la evaluación de los pulsos de descargas parciales.
Los métodos no convencionales emplean sensores con anchos de banda muy superiores a los métodos convencionales pues esto permite la localización de los pulsos por técnicas de reflectometría y el uso de herramientas matemáticas que ayudan a la identificación de los pulsos de descargas parciales.
En esta tesis se proponen y comparan diferentes métodos de evaluación de carga para los métodos no convencionales, y se establecen los límites de la incertidumbre en dichas medidas en función del ancho de banda de los sensores y de la longitud de los pulsos de descargas parciales.
La tesis aborda el análisis de los transformadores de corriente de alta frecuencia que comúnmente se emplean como sensores de descargas parciales para medidas acopladas por campo magnético, y el estudio de los sensores acoplados por campo eléctrico. La comparativa de ambos sensores permite extraer conclusiones acerca de los anchos de banda obtenidos, de la incertidumbre alcanzada para diferentes longitudes de pulso y métodos de evaluación de carga, y de la sensibilidad de los sistemas de medida que emplean estos sensores.
Las medidas experimentales se han realizado empleando diferentes prototipos de sensores acoplados porRodrigo Mor, A. (2012). Nueva metodología de la medida de descargas parciales en cables de alta tensión. Desarrollo de un sensor capacitivo de gran ancho de banda [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/16271Palanci
Partial discharge behavior of mineral oil based nanofluids
No full textA previous study showed that both mineral oil based nanofluids with 0.01% silica mass fraction and with 0.1% fullerene mass fraction have a higher AC breakdown strength than mineral oil. Breakdown occurs following discharge initiation and propagation in the oil. The breakdown strength value alone provides little information on the discharge process. Therefore, it is important to investigate the details of the discharge mechanisms in mineral oil and in nanofluids. Hence, this study focuses on the partial discharge (PD) behavior of mineral oil, silica and fullerene nanofluids. The total charge, voltage and pulse shape were recorded with the help of a high bandwidth PD measuring system. The discharge mechanism in mineral oil appeared to depend strongly on the polarity of the applied DC voltage. Under positive DC voltage, the silica and the fullerene nanofluids show increased inception voltage and a reduction of the total discharge magnitude compared to the reference mineral oil. Under negative polarity, inception voltage and discharge magnitude of the nanofluids and the reference mineral oil are virtually the sam
Condition Assessment of Medium Voltage Cable Joints: Dielectric Spectroscopy of Field Grading Materials
No full textThe electrical properties of a widely used stress control tube for medium voltage heat-shrink joints are examined in this master thesis by using non-destructive laboratory methods. They were determined by use of time domain dielectric response test while changing the DC electric field, temperature and level of humidity. In order to determine the physical and mechanical characteristics of the material at different aging stages and conditions, both differential scanning calorimetry and tensile test measurements were performed on stress control tube samples.Two types of test samples were prepared. For dielectric response tests, Raychem JSCR 42/16 stress control tube was shrunk on a cylindrical rod, consisting of two metal electrodes, separated by a PTFE (Teflon) insulating rod. For differential scanning calorimetry and tensile tests, the stress control tube was shrunk on a cylindrical PTFE rod only, with the same diameter as for the dielectric response tests without the presence of metal electrodes.Tensile test measurements were performed in order to characterize and compare the mechanical properties of the stress control tube material at different aging stages.Differential scanning calorimetry measurements were used to estimate aging degree by assessment of thermal resistivity of the material and antioxidants consumption when exposed to high temperatures for a certain period of time.To calculate the conductivity, dielectric response measurements were performed in time domain at different voltage levels up to 20 kV and charging and discharging time duration of 10800s. They were conducted by placing the test object in a climate chamber in order to examine the influence of temperature and humidity. The measurements were performed on unaged and thermally aged heat shrinkable stress control tubes. The aging process was obtained in heat cabinets at 98°C dry air, 98°C wet air and 150°C dry air conditions.Results from the analysis show that conductivity has not significant dependency of the electric field up to 0.2 kV/mm at different temperatures, aging degree and humidity.It was revealed that conductivity is more temperature dependent, as a significant increase was observed when the temperature was elevated at higher values. Conductivity was found out to be strongly dependent on humidity, especially when combined with high aging degree.<br/
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