Summary
In this article, a qualitative index based on an analytical methodology for calculating a global mechanical withstand safety margin for a power transformer is developed. The safety margin is calculated using parameters describing the transformer's mechanical characteristics, as well as the electrical conditions in the power system to which it is connected. The proposed methodology would allow utility professionals to evaluate the mechanical withstand adequacy of transformers produced by different manufacturers at the time of transformer acquisition, and to monitor any changes in the mechanical withstand capability of transformers already in operation as a result of the evolution of the power system itself. Moreover, the safety margin can serve as a useful metric in defining the distributed generation (DG) hosting capacity of the grid. The practical application of the proposed analysis method is illustrated by analyzing 3 power transformers with different mechanical characteristics, and with ratings of 15 kVA, 5 MVA, and 100 MVA.
he obtains that a critical thinker possesses traits of character that dispose her to think critically, a "critical attitude" (23). Finally, from McPeck, he obtains that a critical thinker has both the willful disposition and the intellectual ability to question the degree to which evidence warrants her belief in propositional knowledge statements or her adoption of courses of action. Reformulating this view, Siegel proposes that:A critical thinker, then, is one who is appropriately moved by reasons: she has a propensity or disposition to believe and act in accordance with reasons; and she has the ability properly to assess the force of reasons in the many contexts in which reasons play a role. (23, emphasis in original)
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