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Cassava common mosaic disease (CCMD) has been reported in all regions where cassava is grown in the Americas and the causal agent, Cassava common mosaic virus (CsCMV), has been identified as a mechanically transmitted potexvirus (Alphaflexiviridae). In Argentina, cassava is grown mainly in the northeast (NEA) region that shares borders with Brazil and Paraguay. Increasing incidences of CCMD were observed...
This paper presents a method for assess the risk index in a power transformers park, risk index is a metric that allows park administrator to ensure an optimal physical asset management, allocating properly financial and human resources in operation and maintenance actions. Assessing risk index requires calculating two secondary sub-index termed failure probability and consequence factor. Those indexes...
This paper presents a method for assess the risk index in a power transformers park, risk index is a metric that allows park administrator to ensure an optimal physical asset management, allocating properly financial and human resources in operation and maintenance actions. Assessing risk index requires calculating two secondary sub-index termed failure probability and consequence factor. Those indexes...
Geothermal energy has not been fully exploited in the Ecuadorian context because there are not many studies in this area. This renewable energy presents as a good alternative due its low operative-maintenance cost, and continuous operation. This work describes the main features of geothermal energy and its residential applications. In Ecuador, the Ministry of Electricity and Renewable Energy has identified...
This paper analyses the influence of common test in power transformers health index assessing. To achieve this objective a test based sensibility analysis is proposed. To show results, a study case is proposed, using a set of real scenarios analyzes the variation of the output (health index) when each input (oil tests) are varied.
Economic losses in the power transformer parks are a consequence of a careless administration of assets. In this work, the parameters considered during the power transformer risk evaluation are presented. Asset management involves a deep analysis and strategies to prevent major failures or malfunctions. A comparison of the procedures to asses risk index of the power transformers is presented. At the...
This paper aims to determine and identify the best technical placement for fault locators — FLs — on the distribution network, in order to improve the reliability in the system. The international indices such as SAIFI and SAIDI are evaluated in two scenarios; the first one analyze the power system in its current configuration whereas the second one assumes that FLs are installed in different places...
This paper presents a description of the common tests used in power transformers health index assessing. Power transformer condition evaluation is bases on humidity, acidity, dielectric strength, dissipation factor, dissolved gas analysis and degree of polymerization. Existing normative brings aceptable limits for each test, this boundaries depends on aplication and operational voltaje level. With...
Due to world economic situation, Electrical Distribution Utilities perform studies for automation and planning of distribution systems prioritizing their economic resources through projects related with technical, economic and social efficiency. During last years, Ecuadorian Electrical Sector has left aside determinant projects related with the efficiency, since there is not a good budget assignment...
This document presents a proposal to asset health index of transformers up to 230 kV. with upgraded thermal paper using fuzzy logic. The health index is a useful asset management tool, and provides a warning of the status of the unit allowing the correct operation and maintenance. This method use oil as inputs routine tests, such as humidity, acidity, dielectric strength, dissipation factor, dissolved...
A case study for the analysis of load flows in weakly meshed radio systems is presented. The problems associated with the running of medium voltage flows are quite critical especially when the network topology is rather arbitrary geospatially. Many of the software currently available on the market consume excessive memory on the calculation of the resolution of the equations of nodes to get the brownouts...
Liberalized markets and strong integration of distributed generation changes significantly the operation and control of distribution grids. Traditional network must be able to integrate new services such as electric vehicles, distributed generation, new loads as inductions cookers without major problems. These new grids should manage those new services intelligently, keeping power quality, safety...
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