Industrial Educational Scientific Sample problems Examples gallery Step-by-step tutorials Verification examples Programming examples Distributive examples Success stories Customers Main >> Applications >> Sample problems >> ZnO overvoltage arrester ZnO lighting arrester varistor, pulse, current, lighting, surge protection This is an example of the ZnO arrester simulation, performed with QuickField software. Problem Type: Axisymmetric problem of transient electric. Geometry: The arrester consists of ZnO tablet placed inside ceramic tube. Electrodes are connected to the end tablets. Given: 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. Problem: Calculate the varistor current. Solution: Results: The arrester can be represented by the equivalent schema with resistor R and capacitance C connected in parallel. 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. Voltage Active current 35 kV 0.67 mA 197 kV 433 A Surge impulse passing through the arrester Download video. View on-line. View simulation report in PDF. Download simulation files (files may be viewed using any QuickField Edition). 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.

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