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M5200 Sweep Frequency Response Analyzer

Detect hidden transformer faults using sweep frequency response analysis (SFRA)

System faults, short circuits, aging, or even handling during transportation can compromise a transformer's mechanical structure. Since these problems are difficult to detect, they usually go unnoticed and worsen over time, leading to loss of performance and possibly failure.

Until recently, your options for dealing with these critical problems were limited. You could ignore them and hope for the best. Or, if you suspected damage, you could detank the transformer to make a costly and time-consuming visual inspection. Even that might not reveal the damage.

The M5200 Sweep Frequency Response Analyzer adds a powerful tool to your quality-control and maintenance toolkit, allowing you to “see” inside the transformer and detect even subtle changes in the mechanical structure of the core and windings – without costly detanking. The M5200 is the most effective diagnostic tool on the market for detecting mechanical problems in power transformers.

The M5200 uses sweep frequency response analysis, a proven technique for making accurate and repeatable measurements. As compared to the “impulse” technique, which estimates the response rather than measuring it, sweep frequency response analysis is preferred for frequency domain 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, such as:

• Core movement
• Winding deformation and displacement
• Faulty core grounds
• Partial winding collapse
• Hoop buckling
• Broken or loosened clamping structures
• Shorted turns and open windings

Use the M5200 to:

• Check new transformers to verify condition
• Improve the quality of your 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 or after earthquakes, lightning, or other environmental events
• Eliminate unnecessary detanking and costly internal inspections

The M5200 is the same as the M5300, but without the built-in PC, visual display, and laptop keyboard. The M5200 requires an external laptop for operation.

Features and Benefits

• 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.