9.3.1 Insulation Power Factor Test

Insulation Power Factor Test

The purpose of this test is to determine the state of dryness of the windings and insulation system and to determine a power factor for the overall insulation, including bushings, oil, and windings. It is a measure of the ratio of the power (I2R) losses to the voltamperes applied during the test. The power factor obtained is a measure of watts lost in the total transformer insulation system, including the bushings. The power factor should not exceed 0.5% at 20 EC. Temperature correction of test results can be performed automatically on the Doble test set. The watts lost should not exceed one-half of one percent of the total power input (voltamperes) from the test. The values obtained at each test are compared to previous tests and baseline factory tests, and a trend can be established as the insulation system ages.


GlobeCore GmbH is one of the world leaders in industrial manufacturing. Products of GlobeCore are used in production of bitumen emulsions, transformer oil regeneration and purification, fuel blending, biodiesel production and emulsification of virtually any materials.

The head office is located in Oldenburg, Germany. Our systems have been supplied to and are successfully operated in 70 countries. A network of 17 dealers supports global sales and services.


обновлено: September 8, 2017 автором: dannik