Encontrados 12 documentos, a visualizar página 1 de 2
Distribution automation on LV and MV using distributed intelligence
Melo, Francisco; Cândido, Carlos; Fortunato, Carlos; Silva, Nuno; Campos, Filipe; Reis, PauloNowadays, the electrical energy distribution network is considered to be a critical infrastructure in industrially developed societies. Its protection regarding safety and security threats is increasing awareness and concern.The fact that this infrastructure is geographically spread across large areas brings difficult technological challenges for fault management (real-time prevention, detection, precise locati...
Fast and secure automatic retrieval of data from multi-vendor devices - The por...
Louro, Miguel; Guisado, Jaime; Fortunato, Carlos; Cura, Carlos; Antunes, Bruno; Areias, Miguel; Grossinho, Miguel; Pereira, Luís PintoNowadays protection systems generate large amounts of useful data. The most important of which are the oscillographic records, because they allow: fault location estimation; validation of relay settings; validation of coordination among protections. This important information traditionally resided in the protection units and could only be retrieved through vendor proprietary software. Retrieving this informatio...
Fault location in an electrical energy distribution infrastructure with a wirel...
Fortunato, Carlos; Casaca, Augusto; Grilo, António; Santos, MiguelThis article presents a detailed analysis of the applicability of wireless systems in the localization of faults in the energy distribution network. The hwardware and software architectures of the envised sensor solution will also be described and finally, the integration of this system into Smart Grids will be discussed in terms of automatic fault analysis. A pilot system has been tested in a subset of the Por...
A computer-based testing system to evaluate protective relays as a tool in powe...
Martins, L. Sousa; Fortunato, Carlos; Pires, V. FernãoTeaching power system relaying is a fundamental issue in a power system high-level course. However, for an effective instruction of this topic an experience with real equipments can be considered as fundamental. To achieve this purpose, in this paper a new approach for the practical learning of power system relaying is presented. This consists of a computer-based testing system of relay-operating characteristic...
A wireless sensor and actuator network for improving the electrical power grid ...
Grilo, António; Casaca, Augusto; Pereira, Paulo; Buttyan, Levente; Gonçalves, José; Fortunato, CarlosThis paper presents an overview of a Wireless Sensor and Actuator Network (WSAN) used to monitor an electrical power grid distribution infrastructure. The WSAN employs appropriate sensors to monitor key grid components, integrating both safety and security services, which improve the grid distribution dependability. The supported applications include, among others, video surveillance of remote secondary substat...
Fault location in an electrical energy distribution infrastructure with a wirel...
Fortunato, Carlos; Casaca, Augusto; Grilo, António; Santos, MiguelThis paper presents a detailed analysis of the applicability of wireless systems in the localization of faults in the energy distribution network. The hardware and software architectures of the envisaged sensor solution will also be described and finally, the integration of this system into Smart Grids will be discussed in terms of automatic fault analysis. A pilot system has been tested in a subset of the Port...
Current differential line protection using a pattern recognition method
Pires, V. Fernão; Fortunato, CarlosThis paper presents a new approach to a numerical current differential protection for the transmission lines. The current differential algorithm uses a pattern recognition method. First the acquired current signals are transformed into “dqo” components by applying the Park transformation. The transformed currents will originate typical patterns according the fault type. Using a pattern recognition algorithm the...
A wireless sensors suite for Smart Grid applications
Grilo, António; Sarmento, Helena; Nunes, Mário; Gonçalves, José; Pereira, Paulo; Casaca, Augusto; Fortunato, CarlosThis paper presents a demonstrator of a Wireless Sensor and Actuator Network (WSAN) for Smart Grid applications, developed in the context of project WSAN4CIP. This WSAN is formed by WSAN nodes equipped with sensors and a wireless radio interface, which monitor key parameters of power grid equipments belonging to the Medium Voltage (MV) and Low Voltage (LV) segments. The measurements are reported to the SCADA sy...
Energy and quality of service management in wireless multimedia sensor networks
Pereira, Paulo; Gonçalves, José; Grilo, António; Fortunato, Carlos; Nunes, Mário; Casaca, AugustoSensor networks are composed of resource constrained nodes that capture data from the environment, preprocess it and then transmit it to a sink node. This paper presents a scenario for monitoring an electricity distribution network, an energy analysis of the used sensor nodes and an intelligent energy and quality of service (QoS) manager. This manager continuously adapts the provided QoS according to the energy...
Transmission lines protection based on the current eigenvalues differential con...
Pires, V. Fernão; Guerreiro, M.; Fortunato, Carlos; Martins, L. SousaThis work presents a new approach for a current differential protection of the transmission lines. The proposed approach is based on the Clarke-Concordia transformation and principal component analysis. First the acquired current signals are transformed into “αβo” components by applying the Clarke-Concordia transformation. This allows obtaining typical patterns. To identify these patterns a principal component ...
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