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The paper presents a fuzzy model analysis of environment power plant impact. The model, called symbolic “EFIM” uses as input data environmental indices. The fuzzy logic is used to provide measures leading to reduced environmental impact within the context of sustainable development. The components of the fuzzy model and its advantages are also presented in the paper.
The power quality is one of the main interests within the power generation, delivery and transmission domains. In order to have a higher quality for the power produced in synchronous generators (mainly located in hydro power plants), using an adequate excitation system is essential. This paper shows a general overview of the main tasks which Romanian power producers have to accomplish today. It also...
ZnO based varistors are today frequently used for making state of the art surge arresters for all voltage levels, due to some advantages like a high non-linearity coefficient and a high energy absorption capacity. Due to their thermal activated conduction, the heat dissipation inside that semiconductor device is crucial for its service. Heat dissipation study could be done only by modelling the thermal...
The most efficient surge-arresters in use today are based on ZnO varistors. All electronic devices and power lines are using varistors in order to protect extremely sensitive devices and consumers against any type of overvoltage, mainly lightning strokes or induced overvoltages, both on power supply lines as well as on data lines. The heat produced inside the varistor is basically incontrollable,...
This paper presents an analogy between the field measurements of the electro-magnetic parameters induced on the passive double circuit line of 220 kV from Hydro-Unit Portile de Fier to city of Resita in Romania and the data obtained by using a specific software application developed in MATHCAD. It allows the determination of all voltages induced by capacitive or inductive connections and the electrical...
In the paper are being analyzed the magnetic losses that occur in the induction machines of low and medium power while being supplied by inverters realized with IGBT transistors. The analysis method is based on the over-position effect principle. As a working hypothesis is being neglected the saturation effect. During analyzes is being deduced the computing relations which allow the quality and quantity...
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