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Simulation of ferroresonance with hysteresis model of transformer at no-load measured in laboratory

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4 Author(s)
Patel, B. ; Electr. Eng. Dept., Haldia Inst. of Technol., Haldia ; Das, S. ; Roy, C.K. ; Roy, M.

Ferro-resonance is a nonlinear dynamic electrical phenomenon in a power system. It may occur in ungrounded three-phase lines at transformer banks on no-load due to malfunctioning of switching devices (one pole closing at first). A hysteresis model is developed with core-type transformers and power capacitors simulating line transformers and capacitance respectively to investigate ferroresonance. For any operating voltage applied to series combination of capacitance and transformer windings at no-load, the critical value of capacitance to cause ferroresonance jump is determined using Rudenbergpsilas graphical method. The resulting ferroresonance over-voltages across circuit components are simulated at various line conditions using the data obtained from an experimental B-H loop of the no-load transformer. The results show the ferroresonance overvoltages reaching dangerously high peak of fundamental frequency across the circuit elements.

Published in:

TENCON 2008 - 2008 IEEE Region 10 Conference

Date of Conference:

19-21 Nov. 2008