Sweep Frequency Response Analysis (SFRA) is a method used to evaluate the mechanical integrity of core, windings and clamping structures within power transformers by measuring their electrical transfer functions over a wide frequency range.
The Doble M5400 Sweep Frequency Response Analyzer 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 (such as from similar units) allows you to identify deviations and confirm internal mechanical problems.
The Doble M5400 Sweep Frequency Response Analyzer features high accuracy, bandwidth, resolution, sensitivity and dynamic range, allowing you to conduct transformer troubleshooting and maintenance checks quickly and accurately.
Features and Benefits of the Doble M5400
• 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.