Raúl García-Ovejero

Raúl García-Ovejero
University of Salamanca · Department of Mechanic Engineering

About

29
Publications
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481
Citations

Publications

Publications (29)
Article
Full-text available
Ensuring the reliability of electrical distribution networks is a pressing concern, especially given the power outages due to surface contamination on insulating components. Surface contamination can elevate surface conductivity, thereby resulting in failures that can lead to power shutdowns. Addressing this challenge, this paper proposes an approa...
Article
Full-text available
The ability to predict and preempt insulator failures holds the potential to enhance the reliability of electrical power grids. The increase in insulator leakage current is an indication that failures may occur. By harnessing historical data and employing time series forecasting models, it is possible to identify potential faults before they escala...
Article
Full-text available
For basic studies of power transmission lines, in steady state, any line is usually modeled through a single-line pi-circuit, which intrinsically represents all the conductors of the three phases, as well as the grounding wires, and thus, allows analytical approaches that facilitate the understanding of the theoretical fundamentals of the operation...
Article
Full-text available
To improve the monitoring of the electrical power grid, it is necessary to evaluate the influence of contamination in relation to leakage current and its progression to a disruptive discharge. In this paper, insulators were tested in a saline chamber to simulate the increase of salt contamination on their surface. From the time series forecasting o...
Chapter
One of the biggest problems in cities today is the significant increase in the number of motor vehicles. Intelligent traffic control is a fundamental part of controlling city travel. To achieve this goal, it is very important to have sensor technologies capable of identifying the number of vehicles traveling on a road. In this paper, we propose the...
Chapter
The textile industry is an important industrial sector of our economy which is dedicated to the production of fibres, yarns, fabrics and all kinds of products related to the manufacture of clothing and many other products used today. These products pose certain problems at the industrial level and at the level of use, of which the electrical ones o...
Preprint
Full-text available
To improve the monitoring of the electrical power grid it is necessary to evaluate the influence of contamination in relation to leakage current and its progression to a disruptive discharge. In this paper, insulators were tested in a saline chamber to simulate the increase of salt contamination on their surface, and to evaluate the supportability...
Article
Full-text available
Outdoor insulators may experience stress due to severe environmental conditions, such as pollution and contamination. Through the identification of partial discharges by ultrasonic noise, it is possible to assess the possibility of a power grid failure occurring. In this paper, ensemble models are used to analyze an ultrasonic signal from an ultras...
Article
Solar Photovoltaics has become one of the cheapest sources of electricity, with the potential to expand further through distributed generation. PV self-consumption can empower electricity customers, transforming them into prosumers, but its success relies on appropriate regulations, especially in the treatment of surplus electricity, being net-mete...
Article
Full-text available
Spacers in the compact power distribution network are essential components for the support, organization, and spacing of conductors. To improve the reliability of these components and have an optimized network design, it is necessary to evaluate the performance of the variation of their geometric parameters. The analysis of these components is fund...
Preprint
Paper under review in Elsevier's "Sustainable Energy Technologies and Assessments" journal. Acepted for publication on 15/06/2022. It will be published under Gold Open-Access.
Chapter
Full-text available
The design and development of wearable biosensor systems for health monitoring has attracted much attention in the scientific community and industry in recent years. This article presents a preliminary study on the design of a smart sock for diabetic patients. This smart sock will allow monitoring of the diabetic patient’s health status and tempera...
Chapter
Full-text available
In today’s globalized world, connectivity is one of the most important aspects of society. The ability to send and receive information from anywhere is one of the characteristics of LoRaWAN technology. This article presents a study of the development of a prototype elaborated with this technology applied to a fundamental primary sector in society,...
Article
Full-text available
Speaker recognition is challenging in real-world environments. Typically, studies approach noises only in an additive manner. However, real environments commonly present reverberating conditions that worsen speech processing. When not considering reverberation in the system modeling, the system may not be robust when applied to real-world condition...
Article
Full-text available
As solar photovoltaics in buildings reaches maturity, grid integration and economic yield are topics of greater interest. The traditional design of photovoltaic installations has considered the optimal orientation of photovoltaic modules to be that which yields the maximum annual energy production. The influence of the consumption patterns and the...
Preprint
Full-text available
The contamination on the insulators may increase its surface conductivity and, as a consequence, electrical discharges occur more frequently, which can lead to interruptions in the power supply. To maintain reliability in the electrical distribution power system, components that have lost their insulating properties must be replaced. Identifying th...
Article
Full-text available
Contamination on insulators may increase the surface conductivity of the insulator, and as a consequence, electrical discharges occur more frequently, which can lead to interruptions in a power supply. To maintain reliability in an electrical distribution power system, components that have lost their insulating properties must be replaced. Identify...
Preprint
Full-text available
As Solar Photovoltaics in buildings reaches maturity, grid integration and economic yield are topics of greater interest. Some strategies like demand shift management or storing electricity in batteries are proposed to reach a higher share of PV into the distribution grid. The price reduction of solar PV has driven a change in support policies from...
Article
Full-text available
Although this is a fact that is not very explored in the literature, there are two possible forms to connect the stator winding of an induction motor in the delta. The choice for one of these forms defines the amplitude of the stator transient current during the switching from star to delta connection when the motor is driven by a star-delta starti...
Article
Full-text available
This work presents an integrated thermal-electrical simulation model, capable of taking into account the thermal and electrical effects of the battery and photovoltaic panels for each instant of time in a given orbit and attitude. Using the physical equations that govern the thermal and electrical models involved during a CubeSat operation, the pro...
Article
Full-text available
During satellite development, engineers need to simulate and understand the satellite's behavior in orbit and minimize failures or inadequate satellite operation. In this sense, one crucial assessment is the irradiance field, which impacts, for example, the power generation through the photovoltaic cells, as well as rules the satellite's thermal co...
Article
Full-text available
Data on diagnosis of infection in the general population are strategic for different applications in the public and private spheres. Among them, the data related to symptoms and people displacement stand out, mainly considering highly contagious diseases. This data is sensitive and requires data privacy initiatives to enable its large-scale use. Th...
Article
Full-text available
The mobile devices cause a constant struggle for the pursuit of data privacy. Nowadays, it appears that the number of mobile devices in the world is increasing. With this increase and technological evolution, thousands of data associated with everyone are generated and stored remotely. Thus, the topic of data privacy is highlighted in several areas...
Article
Full-text available
In Western tonal music, tension in chord progressions plays an important role in defining the path that a musical composition should follow. The creation of chord progressions that reflects such tension profiles can be challenging for novice composers, as it depends on many subjective factors, and also is regulated by multiple theoretical principle...
Preprint
Full-text available
The COVID-19 pandemic plagues the whole world, bringing numerous challenges which need to be addressed. One of them is the privacy of patient data. There are several problems related to data privacy in IoT environments, the use of applications, devices, and functionalities in hospital processes. Therefore, we have compared works from the literature...
Preprint
Full-text available
The mobile devices caused a constant struggle for the pursuit of data privacy. Nowadays, it appears that the number of mobile devices in the world is increasing. With this increase and technological evolution, thousands of data associated with everyone are generated and stored remotely. Thus, the topic of data privacy is highlighted in several area...
Article
Full-text available
In our day to day life, the environmental conditions, and especially the temperature and humidity of the air that surrounds us, go unnoticed. However, in many cases, these parameters play an important role in the use of materials since they modify their electrical properties. It is necessary to predict what this behaviour will be as these environme...
Article
Se habla de la cinética del teñido en una nueva fibra llamada poli (Tereftalato de trimetilenglicol). The textile fiber made of poly(trimethylene terephthalate) came onto the market a few years ago. This fiber has certain advantages over traditional polyester, especially its greater elasticity and the fact that it can be dyed at lower temperatures....

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