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ZnO lighting arrester

This is an example of the ZnO arrester simulation, performed with QuickField software.

Problem Type:
Axisymmetric problem of transient electric.


ZnO arrester model

The arrester consists of ZnO tablet placed inside ceramic tube. Electrodes are connected to the end tablets.

Relative permittivity of the air ε = 1.
Relative permittivity of the ceramic ε = 2.
Relative permittivity of ZnO element ε = 60.
Conductivity of ZnO element - nonlinear.
Nominal voltage U0 = 35 kV.
Maximal current Imax = 520 A.
Surge peak voltage Umax = 200 kV.

surge impulse 8/20 us

Calculate the varistor current.


The arrester can be represented by the equivalent schema with resistor R and capacitance C connected in parallel.

HV arrester electric circuit

At nominal voltage the arrester acts as a capacitance (IC>IR). At overvoltage (surge) IR prevails and arrester acts like a resistor. QuickField can calculate both active (IR) and reactive (IC) currents.


Active current

35 kV

0.67 mA

197 kV

433 A

Surge impulse passing through the arrester

ZnO arrester surge current

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There are no restrictions applied to the QuickField Student Edition postprocessors.
You can view field maps, make plots, calculate integrals and print pictures in the same way that the Professional Edition users do.