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FRA (Frequency Response Analysys Equipment

FRA (Frequency Response Analysys Equipment

FRA (Frequency Response Analysys Equipment

Can somebody tell me where I can find info on a a good RFA equipment from a good make? When asking for that equipment, which should be the paramenters to watch out if the equipment will be purchased?
Thanks for the info.

RE: FRA (Frequency Response Analysys Equipment

For transformers I believe Framatome makes FRA equipment. I don't have any info about what's good and bad.

RE: FRA (Frequency Response Analysys Equipment

Looking at busbar's link reminds me that there are two basic types of frequency response tests.

One applies an impulse in the time domain, measures a time response, and computes the FFT which represents the frequency response.

The other (as introduced by the Doble article) applies a swept sinusoid input, and measures the magnitude and phase of the response for each frequency.

Theoretically results of both tests are the same. In the real world the time-domain method will never recreate the true frequency response since only an approximation of an impulse can be created, and high frequency signals are a little trickier to measure. I really don't know how any of that translates to ability to diagnose transformers.

RE: FRA (Frequency Response Analysys Equipment

That´s the site, BUsbar. Thank you too, Electricpete

RE: FRA (Frequency Response Analysys Equipment

Normally in  power trfs FRA is done by applying 1-250Khz lowvoltage1-10V to one phase and measuring impedance and neutral current of it while keeping earthed all other windings.Measurements are made inb  the entire range of 1-250KHZ range.Also voltage transfer ratio is taken to other windings.These form the benchmarks and any movement in the windings cause a change in the benchmarks.
If you are looking for laboratory models ,HP and Solirtron are also marketing suitable models.

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