Average breakdown voltage at 20°C
Calculation of Breakdown Voltage (Test acc. to IEC 60851.5.4.2, cylinder) The Breakdown voltage depends mainly on the thickness of the insulation (see formula), but also on the bare wire diameter, the application temperature of the coil and the type of enamel.
| Calculation of average value Ds | Example | ||
|---|---|---|---|
| Ds=t*Vµ(volt), with Ds : breakdown voltage t : increase with insulation, t = da - dnom, with da : outer diameter dnom : bare wire diameter Vµ : Volt per micron insulation | Test with cylindrical electrode dnom = 0.071mm (41 AWG) da = 0.083mm t = da - dnom = 0.083 - 0.071 = 0.012mm = 12 µm Vµ = 220 V/µm, therefore Ds = 12µ * 220 V/µ = 2,640 V | ||