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This paper uses an easy technique to calculate directly the parameters for induction motors, using single- and double-cage models. This technique has been applied in a wide sample of 2167 induction motors, where the parameters have been calculated from manufacturer data. The results show that this technique provides large errors in the start and maximum torque points, but on the other hand, it provides...
Although several built-in models are currently available in transient tools for transformer representation, users of these tools can develop their own custom-made models. A very common approach when developing new transformer models is to apply the principle of duality. It has been proved that a topologically-correct model of a single-phase transformer when applying duality is the so-called π model...
Ferroresonance is a complex nonlinear phenomenon that may be initiated in many different ways and involves the association of capacitances and non-linear magnetizing inductances. Although ferroresonance has been present in power systems for more than a century, its behavior and characterization still remain widely unknown This work illustrates a proper guideline for transformer modeling starting from...
Nowadays the term ferroresonance is firmly established in the power system engineer's vocabulary as one of the most destructive transient phenomena, which may cause failures in power equipment such transformers, cables, or arresters. Its complex non-linear behavior makes difficult its characterization. This work links EMTP and MATLAB to presents some techniques for the assessment of ferroresonance...
An algorithm implementing a behavioural modelling technique for estimating the parameters of induction machine models is proposed. This technique, called torque-speed tracking, starts from manufacturer data and solves the identified problems which are caused by the lack of operating points and by the method used to minimise the torque error. The proposed technique is implemented for both single- and...
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