Abstract—This paper studies the effect of Metal Oxide Surge Arrester (MOSA) on ferroresonance overvoltage transformer (VT) considering nonlinear core losses effect. It is expected that MOSA generally cause ferroresonance ‘dropout'. Time-domain study has been done to study this effect. Simulation has been done on a voltage transformer rated 100VA, 275 kV. The magnetization characteristic of the transformer is modelled by a single-value two-term polynomial with order seven. The core loss is modelled by nonlinear resistance. The simulation results reveal that connecting the MOSA in parallel to the VT exhibits a great controlling effect on ferroresonance overvoltages. Phase plane, voltage waveforms, along with bifurcation diagrams are also derived. Significant effect on the onset of chaos, the range of parameter values that may lead to chaos along with ferroresonance overvoltages has been obtained and presented.

Index Terms—Metal oxide surge arrestor, nonlinear corelosses chaos, bifurcation, ferroresonance, voltage transformers.

Hamid Radmanesh and Jafar Khalilpour are with the Electrical Engineering Department, Aeronautical University of Science& Technology,Tehran, Iran (e-mail: Hamid.radmanesh@aut.ac.ir,J_khalilpour@yahoo.com).
Mehrdad Rostami is with Electrical Engineering Department, Shahed University, End of Khalij-e-Fars High way, In front of Imam Khomeini hollyshrine, Tehran-1417953836 , Iran (e-mail: rostami@shahed.ac.ir).

Cite: Hamid Radmanesh, Mehrdad Rostami, and Jafar Khalilpour, "Effect of Metal Oxide Surge Arrester on Ferroresonance in Voltage Transformer Including Nonlinear Core Losses," International Journal of Computer and Electrical Engineering vol. 4, no. 5, pp. 748-752 , 2012.