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Surge Arresters Application Pages

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An Electrostatic Simulation of a Surge Arrester

Based on a paper from the International Electrotechnical Commission: this surge arrester has 2 grading rings. It is formed of 2 electrodes: one at the top formed by a conducting metal rod and 2 conducting metal grading rings, and the other at the bottom forming the pedestal of the surge arrester. The ElecNet simulation presented here was compared to results provided by the IEC.

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Surge Arrester: Minimizing Electric Field Stress in Resistors

The voltage distribution along the resistors in a surge arrester is uneven due to stray capacitances. It is possible to reduce the maximum electric field stress by a careful choice of position for the grading rings. In this example, OptiNet is used with ElecNet to find where the rings should be placed, and what their dimensions should be, in order to reduce the electric field stress in the resistors.

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Thermal Characteristics of a 330 KV Surge Arrester

The thermal analysis of a 330 KV metal oxide lightning arrester is considered in this example. The adiabatic heating of the varistors due to a lightning strike and the subsequent temperature distribution in the device as a function of time is presented.

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