Finite Element Modeling and Examination of Axisymmetric Thermal State of the Overvoltage Suppressor

The overvoltage suppressors can be applied to guard the high-voltage electrical networks from lightning and switching surges. One of the factors defining a reliability of an overvoltage suppressor is effective heat sink from varistors at operation. The axisymmetric finite element model of a porcelain overvoltage suppressor with use of ANSYS 5.6 Faculty Research Students was developed. Steady-state and transient temperature fields in overvoltage suppressors originating at the International Electrotechnical Commission test simulations are obtained. The obtained results have allowed us to put forward recommendations for suppressor structure optimization.
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