Transformer Maintenance Knowledge Vault

Furan Testing - Part 7

There are oil processing and transformer maintenance procedures that will significantly change the content of furans. If the unit is subjected to reclamation/regeneration using an adsorbent system such as Fuller’s Earth, alumina, or one of the other reclaiming adsorbents that can be reactivated, the degree to which furans will be removed will depend on how well the reclaiming job was performed.

Dielectric Breakdown Voltage Testing - Part 2

There are three methods for dielectric breakdown voltage testing. The oldest, the flat disk method, is not very sensitive to the presence of moisture and not sensitive to changes in moisture content, unless the percent saturation of the oil is greater than 60 percent. The method is also not sensitive to the aging and oxidation of the oil. In spite of the fact that the application of this method may be limited in mineral oil filled transformers with regard to moisture increases and oil aging, D877 dielectric breakdown voltage determinations continue to yield important information for a wide variety of equipment types and insulating liquid types – including oil filled transformers. Therefore, SDMyers continues to recommend the test for purposes of providing that information.

Dielectric Breakdown Voltage Testing - Part 3

The ASTM D1816 standard method of measuring dielectric breakdown voltage uses spherical VDE electrodes. This method is run at one of two gap setting: 1 mm or 2 mm. Because of the greater sensitivity, the rate of voltage rise is lower. Also, the D1816 test cell has a motor driven agitator that runs during the test to cause the oil to flow between the electrodes, carrying suspended particles into the gap between the VDE spheres where they can affect the breakdown voltage.

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Furan Testing - Part 7

Dielectric Breakdown Voltage Testing - Part 2

Dielectric Breakdown Voltage Testing - Part 3

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