Polarization Index and Insulation Power Factor Test
Polarization Index and Insulation Power Factor Test
(OP)
Can somebody enlighten me on Polarization Index and Insulation Power Factor Test. Which of the two has more significance in terms of determining the integrity of insulation of a brand new 3 phase oil-filled transformer rated at 23KV/460V. Would appreciate your response.
encon5
encon5






RE: Polarization Index and Insulation Power Factor Test
Additionally, the manner in which the test is performed makes it the more easily interpreted for trending information. A good test technician can configure the test to remove questionable elements from the results to better locate problems.
Utility and heavy industrial users have depended on the power factor test for decades.
old field guy
RE: Polarization Index and Insulation Power Factor Test
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RE: Polarization Index and Insulation Power Factor Test
The ratio of infinity to infinity = 1.0, which is a suspect polarization index number. We were trying to ratio very good against excellent.
RE: Polarization Index and Insulation Power Factor Test
RE: Polarization Index and Insulation Power Factor Test
In my experience / I usually test about 100 power transformers per year from 10 to 750 KV and 500 MVA/ I always measure as most as possible isolation characteristics. Every single measurement is like a small part of window. When all of these parts are visible we can say what is condition of the trasformer for sure.
Only one thing - PF has extremely big dependence from moisture and temperature. PI - hasn't, but SV /step voltage/ can help You too.
Somethin terrible is stalking between the high voltage potentials