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Engineering Calculator · 128

Planar Specimen Electric Field Calculator

Calculate a planar specimen’s average field from voltage and thickness, with a clear distinction between applied field and measured breakdown strength.

Electrical continuity
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Live calculation

Enter the known values.

Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.

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Inputs

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Results

Average planar electric field2.5kV/mm
Average planar electric field2,500V/mm

Formula
Eavg=VtE_{\mathrm{avg}}=\frac{V}{t}1 kV/mm=1000 V/mm1\,\mathrm{kV/mm}=1000\,\mathrm{V/mm}

The calculation runs locally in this browser. Values are not submitted or stored by this tool.

Direct answer

What this result means

For an ideal uniform planar field, average electric field is voltage divided by specimen thickness. Applying 5 kV across 2 mm gives 2.5 kV/mm. That arithmetic represents breakdown strength only when the voltage is an actual breakdown value from the applicable controlled test.

Planar Specimen Electric Field Calculator engineering relationship diagramThe form accepts voltage in kilovolts and thickness in millimetres. The same division can normalize a measured breakdown voltage, but a withstand-test voltage or rated voltage must not be renamed breakdown voltage. Electrode edges, nonuniform fields and insulation interfaces are outside this ideal planar model. This dedicated schematic represents planar voltage thickness average field and is not to scale.VtElectrodeAverage planar field E = V / tAPPLIED VOLTAGE OVER THICKNESS · TOOL 128Applied or measured breakd…Average planar electric fi…
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

The form accepts voltage in kilovolts and thickness in millimetres. The same division can normalize a measured breakdown voltage, but a withstand-test voltage or rated voltage must not be renamed breakdown voltage. Electrode edges, nonuniform fields and insulation interfaces are outside this ideal planar model.

Calculation relationship
Eavg=VtE_{\mathrm{avg}}=\frac{V}{t}1 kV/mm=1000 V/mm1\,\mathrm{kV/mm}=1000\,\mathrm{V/mm}

The form accepts voltage in kilovolts and thickness in millimetres. The same division can normalize a measured breakdown voltage, but a withstand-test voltage or rated voltage must not be renamed breakdown voltage. Electrode edges, nonuniform fields and insulation interfaces are outside this ideal planar model.

Formula terms

Variables

tSpecimen thickness between the relevant electrodesmm

Use sequence

From measurement to review

  1. Identify specimen thickness, electrodes, waveform and whether the voltage was applied or measured at breakdown.
  2. Enter voltage in kilovolts and thickness in millimetres.
  3. Keep the test conditions with the normalized result and assess complete-product insulation coordination separately.

Limits

What this calculation does not confirm

  • The calculation is an average across a planar thickness; local fields and edge enhancement are excluded.
  • Breakdown strength depends on the specified test, waveform, electrodes, environment and specimen history.
  • The result does not establish rated voltage, clearance, creepage, connector withstand capability or product conformity.

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Calculator FAQ

Use the number without losing the engineering context.

These answers clarify what the tool calculates and where a product-specific review still begins.

01Calculator guidanceWhen can voltage divided by thickness be called dielectric strength?

When voltage represents actual breakdown in a valid electric-strength test and thickness and test conditions follow that method. An arbitrary applied voltage gives average field, not measured breakdown strength.

02Calculator guidanceCan material dielectric strength determine a connector’s rated voltage?

No. The complete design also depends on fields, interfaces, clearance, creepage, contamination, transient conditions and applicable insulation-coordination requirements.

03Calculator guidanceWhy can two specimens show different breakdown fields at the same thickness?

Material condition, defects, electrodes, waveform, voltage rise, temperature and environment affect breakdown. Keep those conditions with the result before comparing reported strengths.

Product selection support

Connect the calculation with cable-entry product options.

Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.

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