The Doble M5400 SFRA Analyser uses sweep frequency response analysis, a proven technique for making accurate and repeatable measurements. The instrument sends an excitation signal into the transformer and measures the returning signals. Comparing this response to baseline and other results from similar units allows for the identification of deviations and confirm internal mechanical problems such as core movement, winding deformation and displacement, faulty core grounds, partial winding collapse, hoop buckling, broken or loosened clamping structures and shorted turns and open windings.
The Doble M5400 can be used to check new transformers to verify condition, improve the quality of a regular inspection program, combat system problems such as short-circuit faults that can damage transformers, inspect for damage if the transformer has experienced mechanical stress and to eliminate unnecessary detanking and costly internal inspections.
Features
Wide frequency range
Provides frequency-response measurement from 10 Hz to 25 MHz; the default range (20 Hz to 2 MHz) covers the most important diagnostic areas: core and magnetic properties; winding movement and deformation; and interconnections (leads and tap changers).
High resolution
Measures frequency response at logarithmically spaced intervals of 1.2% with a constant excitation level and can auto-scale each measurement, providing an overall dynamic range of 80 dB with ±1 dB accuracy, for the highest combination of dynamic range and accuracy.
Repeatable tests
Frequency response measurements are highly repeatable; even subtle changes can be used for diagnosis.
Rugged and portable
Rugged construction provides the accuracy of a laboratory instrument with the ability to withstand harsh field conditions and robust test leads to handle the rigors of site testing.
