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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
The surge arrester example presented on these pages is based on a document from the International Electrotechnical Commission (IEC) -- "Guide for the determination of voltage distribution along the length of metal-oxide surge arresters". ElecNet simulation results were compared to some results provided in this document.
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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 temperatature distribution in the device as a function of time is presented.
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