Abstract
This paper investigates the Effect of Metal Oxide Arrester (MOV) on the Chaotic Behaviour of power transformers considering nonlinear model for core loss of transformer. The paper contains two parts. In part (1): effect of nonlinear core on the onset of chaotic ferroresonance in a power transformer is evaluated. The core loss is modeled by a third order power series in voltage. in part (2): Effect of Metal Oxide Arrester(MOV) on results in part (1) will be studied. The results reveal that the presence of the arrester has a mitigating effect on ferroresonant chaotic overvoltages. resulted bifurcation diagrams and phase plane diagrams have also been delivered.
Highlights
Ferroresonance is a complex nonlinear electrical phenomenon that can cause dielectric and thermal problems to components power system
This paper investigates the Effect of Metal Oxide Arrester (MOV) on the Chaotic Behaviour of power transformers considering nonlinear model for core loss of transformer
The core loss is modeled by a third order power series in voltage. in part (2): Effect of Metal Oxide Arrester(MOV) on results in part (1) will be studied
Summary
Ferroresonance is a complex nonlinear electrical phenomenon that can cause dielectric and thermal problems to components power system. The relationship between voltage and current is dependent on frequency and on other factors such as system voltage magnitude, initial magnetic flux condition of transformer iron core, total loss in the ferroresonant circuit and moment of switching [2]. The prerequisite for ferroresonance is a circuit containing iron core inductance and a capacitance Such a circuit is characterized by simultaneous existence of several steady-state solutions for a given set of circuit parameters. The mitigating effect of transformer with linear core loss model connected in parallel to a MOV arrester is illustrated in Ref. In all of done researches until now, the effect of Metal Oxide Arrester on the chaotic ferroresonance behaviour of power transformer with nonlinear core loss model have not be done. Present paper addresses the Effect of Metal Oxide Arrester on chaotic behaviour of power transformer considering nonlinear core loss
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