Demilitarized network to secure the data stored in industrial networks

Currently, the data and variables of a control system are the most important elements to be safeguarded in an industrial network, so it is vitally important to ensure their safety. This paper presents the design and simulation of a demilitarized network (DMZ) using firewalls to control access to all the information that is stored in the servers of the industrial network of the Hermanos Díaz Refinery in Santiago de Cuba, Cuba. In addition, the characteristics, configurations, methods, and rules of DMZs and firewalls are shown, select the configuration with three multi-legged firewalls as the most appropriate for our application, since it allows efficient exchange of data guaranteeing security and avoiding the violation of the control system. Finally, the simulation of the proposed network is carried out

Tools for the implementation of a SCADA system in a desalination process

In this work a system is designed and implemented in SCADA MOVICON 11.5, in which the operation of five seawater desalination lines by reverse osmosis which work in parallel, with four coastal wells and two end-of-line pumps of the permeated water obtainedare integrated, synchronized and supervised as a single plant. Each desalination line has its own control system and can operate independently. As a product, synchronization algorithms were obtained that were added to the system through script codes, which guarantee continuous productivity in the desalination process, achieving synchronization between the mentioned sub-processes. Simultaneous operations of starting, washing and stopping that affected the performance of the osmosis lines are avoided. Alarmsare generated, reports are created, historical records and trends for the decision making on failures prediction, predictive maintenance and troubleshooting

A fuzzy logic proposal for diagnosis multiple incipient faults in a power transformer

For the safety and continuity of service in industrial electrical systems, the availability of transformers is essential. For this reason, it is necessary to develop intelligent fault diagnosis techniques to reduce repair and maintenance costs. Recently, several methods have been developed that use artificial intelligence techniques such as neural networks, support vector machines, hybrid techniques, etc., for the diagnosis of faults in power transformers using gas analysis. These methods, although they present very good results, encounter restrictions to determine the precise moment before the occurrence of multiple fault of small magnitude and are difficult to implement in practice. This document proposes a method to diagnose multiple incipient faults in a power transformer using fuzzy logic. The proposal, based on historical data from the composition of the gases dissolved in the oil, achieves a performance in the classification of multiple incipient fault of 98.3%. With reliable samples of dissolved gas, it guarantees an overall rate of accuracy in detecting incipient faults that is superior to that obtained by the most successful conventional methods in the industry. The proposal does not encounter generalization difficulties and constitutes a simple solution that allows determining the state of the transformer in service without affecting the continuity of the electricity supply

Diseño e implementación de un sistema de control domótico residencial

Los sistemas domóticos representan un enfoque eficiente para promover el ahorro de energía en el sector residencial. Esto es de especial importancia en Cuba, donde el sector residencial representa el 53% del consumo. No obstante, los sistemas domóticos son costosos, lo que limita su aplicación. Este trabajo desarrolló un sistema domótico de bajo costo para monitorear y controlar sistemas de confort, seguridad, y consumo de energía en una vivienda. El sistema se aplicó en una vivienda a escala, donde funcionó de forma satisfactoria. El sistema diseñado en este estudio tiene un costo equivalente al 22.2% del costo de un sistema domótico con tecnología convencionalDomotic systems are an efficient approach to promote energy efficiency in the residential sector. This is especially important in Cuba, where the residential sector accounts for 53% of the electricity consumption. However, domotic systems are costly, which is a limiting factor for their application. This study developed a low-cost domotic system for monitoring and control comfort, security, and energy consumption aspects in households. The system was implemented in a scaled household, with satisfactory results. The system designed account for a cost equivalent to 22.2% of the cost of a domotic system developed with conventional technolog

Design and implementation of an Android application for the monitoring and decision making of an intelligent building

En el presente trabajo se diseña e implementa una aplicación para teléfonos celulares inteligentes (smartphones), los cuales trabajan con el sistema operativo Android para el monitoreo de una edificación domótica. En la investigación se analizan los diferentes entornos de desarrollo de aplicaciones Android y las características de las redes inalámbricas existentes, seleccionando como red de área local a utilizar la WLAN (Wireless Local Area Network), por las ventajas que la misma ofrece y las características propias del proyecto. Además, se escoge la topología “Cliente y punto de acceso” para realizar la conexión inalámbrica, y se identifica la tecnología WiFi que se va a utilizar. Por último, se diseña la aplicación analizando el entorno de desarrollo de Android, se realiza la Interfaz de la App “Android Home” y la conexión de Arduino con Android Studio vía WiFi. Con el trabajo “Diseño e implementación de una aplicación Android para el monitoreo y toma de decisiones de una edificación inteligente”, los estudiantes y profesores de la facultad de Ingeniería Eléctrica podrán contar con la aplicación inalámbrica para controlar la maqueta de laboratorio de la Edificación Domótica.In the present work, an application is designed and implemented for smartphones that work with the Android operating system for the monitoring of a home automation. The research studies the different Android application development environments and the characteristics of existing wireless a network, selecting as local area network to use the Wireless Local Area Network (WLAN) because of the advantages it offers and the advantages of it and the characteristics of the project. In addition, the “Client and access point” topology is chosen to make the wireless connection and identifies the Wi-Fi technology to be used. Finally, the application is designed analyzing the development environment of Android, it realizes the interface of the App “Android Home” and the connection of Arduino with Android Studio via WiFi. With the work “Design and implementation of an Android application for the control of a smart home”, students and professors of the faculty of Electrical Engineering can count on the wireless application to control the laboratory model of the Home Automation

Sistema de uso doméstico para monitorear el consumo energético combinando el uso de las plataformas arduino y android

Los sistemas domóticos se presentan como una estrategia importante para monitorear el consumo eléctrico doméstico para una gestión energética adecuada que permita reducir el consumo en los hogares. En este estudio se desarrolló un sistema domótico económico para medir el consumo eléctrico en tiempo real en hogares cubanos. El sistema está basado en las plataformas Arduino y Android, usando diferentes sensores. Adicionalmente, se desarrolló una App compatible con Android para conectarla con el sistema, permitiendo la interacción entre el usuario y el sistema. Comparado con las mediciones del metro-contador eléctrico de la vivienda, el sistema obtienes resultados con 0.36% de error. Por consiguiente, el sistema es adecuado para medir el consumo eléctrico residencial. Dada sus características, este dispositivo y la aplicación pueden mejorarse para su uso en instalaciones del sector terciarioDomotic systems rise as an effective strategy to monitor residential electricity consumption towards adequate energy management to reduce household energy consumption. This study developed a low-cost domotic system to measure electricity consumption in real-time in Cuban households. The system is based on Arduino and Android systems, combined with different sensors. Additionally, an app compatible with Android was developed for the interaction between users and the system. During the experimental validation, contrasting the system results to the household electric meter shows that the system measured the electricity consumption with an error of 0.36%. Consequently, the system is suitable to monitor household electricity consumption. Furthermore, this system can be upgraded to implement it in facilities of the tertiary secto

Diseño de un sistema de supervisión y control del centro de datos del grupo empresarial CUBANÍQUEL

El Nodo del Grupo Empresarial CUBANÍQUEL, Centro de servicios telemáticos, administrado por la Empresa SERCONI, necesita la incorporación de servicios inmóticos, donde se controle y se supervise la temperatura, la presencia de personal, la luminaria interior y la fuente de suministro eléctrico. Así mismo, la empresa SERCONI requiere del control del consumo energético en horarios de alta demanda, y la luminaria exterior para minimizar los gastos a la empresa y al país. En el presente trabajo se diseña e implementa una aplicación para teléfonos inteligentes que funcionan con el sistema operativo Android para la monitorización de una instalación domótica. En la investigación se estudian los diferentes entornos de desarrollo de aplicaciones Android y las características de una red inalámbrica existente, seleccionando como red de área local a utilizar la Red de Área Local Inalámbrica (WLAN), por las ventajas que ofrece y las ventajas de la misma y las características del proyecto. Además, se elige la topología "Cliente y punto de acceso" para realizar la conexión inalámbrica y se identifica la tecnología Wi-Fi a utilizar. Por último, se diseña la aplicación analizando el entorno de desarrollo de Android, se realiza la interfaz de la App "Android Home" y la conexión de Arduino con Android Studio vía WiFi. Con el trabajo "Diseño e implementación de una aplicación Android para el control de una casa inteligente", los alumnos y profesores de la facultad de Ingeniería Eléctrica pueden contar con la aplicación inalámbrica para controlar el modelo de laboratorio de la Domótica.The CUBANÍQUEL Business Group Node, a telematic services center managed by SERCONI, needs the incorporation of inmotic services, where the temperature, the presence of personnel, the interior lighting and the power supply source are controlled and supervised. Likewise, SERCONI needs to control energy consumption during high-demand hours, and the exterior lighting to minimize costs for the company and the country. In the present work, an application is designed and implemented for smartphones that work with the Android operating system for the monitoring of a home automation. The research studies the different Android application development environments and the characteristics of existing wireless a network, selecting as local area network to use the Wireless Local Area Network (WLAN) because of the advantages it offers and the advantages of it and the characteristics of the project. In addition, the “Client and access point” topology is chosen to make the wireless connection and identifies the Wi-Fi technology to be used. Finally, the application is designed analyzing the development environment of Android, it realizes the interface of the App “Android Home” and the connection of Arduino with Android Studio via WiFi. With the work “Design and implementation of an Android application for the control of a smart home”, students and professors of the Faculty of Electrical Engineering can count on the wireless application to control the laboratory model of the Home Automation

Design of automatic control system based on unified timed hybrid Petri net

A practical problem inautomationsystems modelingisthe choice between afully hybridapproach andthe fluidization of some parts conserving the general discrete event approach. This paper explores the approach based onspecific hybrid partsinto a discrete event system using a unifiedPetri nets environmentcalledGHENeSys (General HierarchicalEnhancedNetSystem),which follows the ISO/IEC 15909standard and includes extensions such as hierarchy and timeconcepts. Then, a designmethodbased onGHENeSysTimedHybridPetri Net(GTHPN) technique is proposed to model these hybrid parts.GHENeSys subnets are associated with macro-places and help to control combinatorial explosion and has extended arcs to guarantee the GTHPN applicability to practical cases. Allresulting models of the approach proposed could alsobenefit from aneasierconversiontoPLC programs in IEC 61131 representation. A casestudyis presented for producing constructive blocks showing the advantages of the current proposition.Un problema práctico en sistemas automatizados es la selección entre el enfoque totalmente híbrido o la fluidización de algunas partes conservando el enfoque general de eventos discretos. Este articulo trata el enfoque basado en partes hibridas en un modelo discreto usando el ambiente unificado de Redes de Petri llamado GHENeSys (Sistema de Red Extendida Jerárquica General), compatible con la norma ISO/IEC 15909 incluyendo los conceptos de jerarquía y tiempo. Por tanto, se propone un método de diseño y una técnica GTHPN (Redes de Petri Temporizadas Hibridas GHENeSys) para modelar estas partes híbridas. Las subredes en macro-lugares controlan la explosión de estados y controlar transiciones mediante arcos extendidos de GHENeSys garantiza la efectividad de GTHPN para casos prácticos. Además, todo modelo resultante permite una fácil conversión a programas de PLCs en lenguajes IEC61131. Se presenta un caso de estudio para producción de bloques de construcción demostrando estas ventajas mencionadas

A proposal for the diagnosis of incipient faults in power transformers using fuzzy logic techniques

The availability of power transformers is essential for the safety and continuity of electrical service. Today's fault diagnosis methods use intelligent techniques such as neural networks, support machines, hybrid techniques, among others. Although they present good results, these techniques find restrictions in the ability to determine the precise moment in the event of multiple and small-magnitude faults. The proposal includes a new algorithm based on fuzzy rules that incorporates the daily increase of dissolved gases in the transformer oil that improves the classification of incipient faults. With reliable samples of gas dissolved in oil, the method proposed in the research can obtain a total precision rate of 91.4%. In contrast, this degree of precision is lower in other conventional methods reported in the bibliography. In addition, its performance in the classification of multiple failures is 97.5%. The method uses fuzzy logic tools to suggest actions aimed at preventive maintenance by monitoring the total of combustible gases dissolved in the oil. The proposal is a simple and easy solution to implement in practice that allows determining the status of the transformer in service without affecting the continuity of the electricity supply