Frequency Response Analysis (FRA)

Frequency response analysis (FRA) test system is designed to detect winding movements resulting from shipping damage, subjection to low impedance through faults, or general looseness of clamping structures brought on by the normal effects of ageing, in most sizes of distribution and power transformers. The FRA also identifies problems such as core movements, winding deformation and displacement, faulty core grounds, partial winding collapse, hoop buckling, broken or loosened clamping structures, shorted turns and open windings.
  
The swept frequency method for making FRA measurements, injects the wide range of frequencies required by making a frequency sweep using a sinusoidal signal. The sinusoidal signal is generated using a network analyzer, which is also used to make the voltage measurements and manipulate the results. The time taken by the analyzer to sweep the required frequency range varies from a little under one minute to perhaps ten minutes.

FRA is a proven technique for making accurate, repeatable and reliable measurements in which the results can be compared between phases, previous results or sister units.

Application includes: Transformers, Generators.