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Power transmission systems involve an essential relationship in the productive and social sectors of a country. The power transformers are one of the main components in the power systems; these systems allow exporting energy in high voltage over long distances. Failure of a power transformer can lead to a partial or total collapse of an electrical system. There are several procedures for maintenance and diagnosis of such equipment. In this paper, a critical review of eight of the main diagnostic techniques of power transformers is made, including its description and historical evolution, taking into account that currently, those methods can be applied online or those that probably will be applied. [ABSTRACT FROM AUTHOR]

This paper aims to present the results obtained by comparing two reactive routing protocols: ad hoc ondemand distance vector and dynamic source routing protocol. This served to evaluate quality of service quality metrics in two wireless network topologies in a rural isolated electric microgrid. The network infrastructure was simulated using the Network Simulator 2. The quality of service metrics compared in this study includes the average delay, the throughput, the rate of successfully delivered packets, and the jitter in two network topologies: tree and mesh. The results showed that the reactive routing on-demand protocol presented better service quality indicators in both topologies. In conclusion, the routing protocol complies with the communication requirements for the operation of a rural isolated microgrid with low node density. [ABSTRACT FROM AUTHOR]

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Copyright of Visión Electrónica is the property of Fondo de Universidad Distrital Francisco Jose de Caldas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Visión Electrónica is the property of Fondo de Universidad Distrital Francisco Jose de Caldas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tecnura is the property of Tecnura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tecnura is the property of Tecnura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The infiuence of the topology of electric networks and feeders on the condition number of the matrix associated to its mathematical model is studied. It is noted that the condition number of these matrices has a great dependence on the structure of the network and that it is affected by the network degree. Computer simulation results of different cases are included, which show the achievement of a relation of consequence. [ABSTRACT FROM AUTHOR]

ISSIM is a discrete event simulator designed to evaluate routing algorithms with and without routing quality of service capabilities in Best Effort and Integrated Services architectures. ISSIM is a tool that allows to build network topologies in a graphic way and results are delivered in a spreadsheet compatible format. A new simulator was designed because of necessity of comparing the three routing algorithms, SPF and QOSPF precalculus and calculus on demand, under the same conditions. Among the found results are the complexities of the Dijkstra algorithm and its variants with Quality of Service (precalculus and calculus on demand), the impacts in the process time and used bandwidth. [ABSTRACT FROM AUTHOR]