engleski

Experimental Investigation of Impact of Remnant Flux on the Ferroresonance Initiation

The paper presents an experimental and numerical investigation carried out on a ferroresonant circuit in order to determine to what extent the initiation of ferroresonance depends on remnant flux. In order to gain the full insight of impact of initial conditions on the initiation of ferroresonance in general, the investigation was carried out varying the initial capacitance voltage and the phase shift as well. Ferroresonant circuit under study comprises a linear capacitor, sinusoidal voltage source and a coil designed for 30 V nominal primary voltage with the core made of oriented transformer sheets (M5-type). Additionally, the response of the circuit was obtained using a coil with the same core type (M5- type), but designed for higher nominal primary voltage (36 V) and a coil designed for 30 V nominal primary voltage, but with the core made of Ni-Fe alloy (Trafoperm N3). Based on measurements and simulation results, it is shown that the remnant flux and initial conditions in general, as well as phase shift have significant impact on initiation of ferroresonance for all used coil types. Thereby, the odd-symmetry of responses was observed as a consequence of odd-symmetric characteristics of passive circuit elements. The impact of initial conditions is explained theoretically as well, using a bifurcation diagram and calculation of Floquet multipliers.

bifurcation ; remnant flux ; ferroresonance ; ferroresonance circuits ; modeling ; nonlinear circuits

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