Dielectric frequency response analyzer

Data records

• Dielectric frequency response analyzers are used on power and instrument transformers, on oil-impregnated and resin-impregnated bushings, on rotating machines and on power cables, after drying and at commissioning as well as in condition-based maintenance. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.dielectric-frequency-response-analyzer.applications
• Dielectric frequency response and sweep frequency response analysis are different tests despite both using many frequencies: the first assesses how insulation losses vary with frequency, the second how a signal propagates through a winding, which is a mechanical assessment. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.dielectric-frequency-response-analyzer.distinct-from-sfra
• The analyzer combines frequency domain spectroscopy for the higher frequencies with polarization and depolarization current measurement in the time domain for the lowest frequencies, and some designs apply several frequencies at once to shorten the measurement. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.dielectric-frequency-response-analyzer.frequency-and-time-domain
• A dielectric frequency response analyzer measures capacitance and dissipation factor over many frequencies, from far below to above the power frequency, and the shape of the resulting curve depends on the insulation geometry, its moisture, the conductivity of the oil and the temperature. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.dielectric-frequency-response-analyzer.method
• The measured curve is fitted to a model of the oil-paper insulation so that the moisture content of the cellulose is estimated without oil sampling, whether the cellulose sits in mineral oil, in a natural or synthetic ester, in air or in vacuum. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.dielectric-frequency-response-analyzer.moisture-estimation
• One measurement yields the moisture content of the solid insulation and the conductivity of the oil, and from the same data the analyzer also reports capacitance, the line-frequency power factor or dissipation factor, insulation resistance and the timed-ratio indices polarization index and dielectric absorption ratio. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.dielectric-frequency-response-analyzer.reported-results
• Because the moisture is determined in the cellulose itself, the test does not have to wait until the water in the oil and in the paper has come to equilibrium, and the analysis corrects for temperature, for the geometry of the insulation, for the conductivity of the oil and for aging products. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.dielectric-frequency-response-analyzer.temperature-handling