Nicolae Coroiu

Nicolae Coroiu
University of Oradea · Department of Electrical Engineering

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11
Publications
522
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11
Citations

Publications

Publications (11)
Conference Paper
Full-text available
The purpose of the present paper is identifying and statistical testing of random variables time between failures (TBF) and time to corrective maintenance (TCM) for an 110kV power equipments sample, based upon the historical data regarding their operational behavior in a given period of time. Through statistical analysis of the relevant data we est...
Conference Paper
The paper represents a reaction to the alarm signal made by the physician of Oradeapsilas Power Distribution Company (S.D. Oradea). The physician noticed above the average values tendency to illness, by the operating personnel from the electric stations. The first part contains some considerations on the risk concept. References are made to risk fa...
Conference Paper
Reachability and observability criteria are obtained for 2D continuous-discrete time-variable Attasi type systems by using suitable 2D reachability and observability Gramians. Necessary and sufficient conditions of reachability and observability are ...
Conference Paper
The paper has three parts. The first part presents the characteristics of the power transformers that make the object of the analysis and their loading characteristics (load curve, over-voltages, over-currents). The second part shows the state characteristics of the electric insulating oil for each transformer under analysis, in terms of some essen...
Conference Paper
Full-text available
In Romania there are still almost 2500 relatively isolated small rural communities with no, or only partial, electrification. The first part of the paper is a presentation of the isolated settlements in Romania that need electrification: number of inhabitants, distances, electricity demand and load forecast. The Romanian regulatory framework on thi...
Conference Paper
Full-text available
The paper comparatively presents the alternatives that can be adopted for the supply of small single-phase consumers distributed in not so distanced areas as to S.C. ELECTRICA distribution networks, for which the supply alternatives from local generators (MHC, wind, photovoltaic ones) are prohibited so far by costs.
Conference Paper
The paper has three parts. The first part presents the characteristics of the power transformers that make the object of the analysis and their loading characteristics (load curve, over-voltages, over-currents). The second part shows the state characteristics of the electric insulating oil for each transformer under analysis, in terms of some essen...
Article
Full-text available
In the present conditions of the civilization development the access on these advantages is apparently normal. However, the existence of potential consumers located in isolated areas and having large distances by existent power networks leads to the apparition of question marks both to distribution companies and also to local communities on taking...
Article
The paper is structured in three parts. The first part explains the parametrical reliability of the power transformers (PT) in oil in context with its global reliability. Is presenting the proposed model to parametrical reliability evaluate of PT. There explains the parametrical risk failure of PT and its global parametrical reliability. In the sec...
Article
Full-text available
The paper it is structured in five parts. In the first part it is presented the present state of the preoccupations, principles and hypothesis that are applied by the paper's authors at the evaluation of the distribution electrical networks' (DEN) efficiency.In the second part it is presented the mathematical pattern for impact's evaluation of DUR...

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