Dielectric frequency response
Updated 2026-10-27
Data records
- Dielectric frequency response is the measurement of the capacitance and the dielectric loss of an insulation system over a range of frequencies that extends from far below the power frequency to above it. The shape of the resulting curve depends on the insulation geometry, its moisture content, the conductivity of the insulating liquid and the temperature, and it is fitted to a model to estimate the moisture in the solid insulation.
- In field practice a dielectric frequency response analyzer measures capacitance and tan delta or power factor at many frequencies and fits the curve to a reference material model to report the moisture content of the solid insulation, the conductivity of the oil and the power frequency tan delta or power factor, each translated to a reference temperature. The method is distinct from sweep frequency response analysis, which assesses the propagation of a signal through a winding and gives a mechanical assessment of a transformer.
Elsewhere in the family
- Dielectric Frequency Response related entry on Electrical Testing Reference
- Dielectric Frequency Response related entry on Transformer Testing Reference
Sources
- Electrical Testing Reference editorial taxonomy, Electrical Testing Reference editorial taxonomy of test methods, 2026-10 edition, Electrical Testing Reference. Held as: Own observation.
- Megger product page, IDAX series of insulation diagnostic analysers, web page edition, Megger. Held as: Public page. Publisher page
Changelog (4 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-27 | created (gloss.dielectric-frequency-response.definition) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (gloss.dielectric-frequency-response.definition) | |
| 2026-10-27 | created (gloss.dielectric-frequency-response.usage) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (gloss.dielectric-frequency-response.usage) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"Dielectric frequency response." Test Instrument Reference. 2026-10-27. https://www.testinstrumentreference.com/glossary/dielectric-frequency-response/.
Test Instrument Reference, Dielectric frequency response (Oct. 27, 2026), https://www.testinstrumentreference.com/glossary/dielectric-frequency-response/.
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organization = {Test Instrument Reference},
publisher = {Test Instrument Reference},
year = {2026},
note = {last substantive change 2026-10-27}
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