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Surge Arresters
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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An Electrostatic Simulation of a Surge Arrester
An electrostatic (Capacitive) simulation of the surge arrester is presented. The metal-oxide resistors were given a relative permittivity of 800, while a permittivity of 5 was chosen for the porcelain housings.
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