This video tutorial shows the progression of power factor or dissipation factor over frequency. Furthermore, measuring transformer winding insulation, including the connection of measuring leads, is explained. Reasons why recording frequency responses is important for a correct diagnosis of a transformer winding are discussed.

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Edvard Csanyi

Edvard - Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV high power busbar trunking (<6300A) in power substations, buildings and industry fascilities. Designing of LV/MV switchgears.Professional in AutoCAD programming and web-design.Present on


  1. […] faults resulting in loss of oil reduce winding insulation as well as producing abnormal temperature […]

  2. […] in transformers can be found in different parts of the insulation system. It can accumulate in solid insulation, be dissolved in oil, or be found in the form of liquid water at the core or bottom of a […]

  3. […] The winding earth fault current depends on the earthing impedance value and is also proportional to the […]

  4. omeralnahi
    Aug 02, 2012


  5. […] The DMH type relay provides high speed biased differential protection for two or three winding transformers. The relay is immune to high inrush current and has a high degree of stability against through […]

  6. […] Winding Temperature ThermometerThese devices are supposed to indicate hottest spot in the winding based on the manufacturers heat run tests. At best, this device is only accurate at top nameplate […]

  7. […] on the application, the size of the unit, and the amount of heat that needs to be dissipated. The insulating medium inside a transformer, usually oil, serves multiple purposes, first to act as an insulator, and […]

  8. […] Aerial transformer installations may utilize a three-phase unit or banked single-phase units. Transformers, either […]

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