Abstract
| In this paper, the authors present a study on the energetic opportunity to replace derated motors of the five mills which are in service at a power plant with other motors by a rated power closer to the actual load. To this end, it has previously been drawn up a suggestive comparative analysis of diagrams of active and reactive power balance in absolute and percentage values for each case of considered constructive variants. Thus for drawing up, using the complete mathematical model (BEMAS) chosen for the asynchronous machine, of the electric balances for different operating regimes of these asynchronous motors, it was necessary to determine the parameters of the equivalent diagram. Considering the complexity and large volume of computation, the authors developed for this purpose, specific computational algorithms. For all these computational algorithms, computation programs have been drawn, being developed in the programming environment Mathcad Version 7.0, of own conception and which in principle can be used for any other similar motors that have different nominal data. It has also been highlighted that the starting point to establishing the opportunity of replacing of the analyzed asynchronous motors operating derated in steady state, is determining the actual load degree that is achieved through active power measurement for the considered regime. |
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