M5000 Sweep Frequency Response Analyzer Series

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

Sweep Frequency Response Analysis

Sweep frequency response is a major advance in transformer condition analysis, allowing you to "see" inside transformers without costly detanking.

The standard definition of frequency response analysis (FRA) is the ratio of a steady sinusoidal output from a test object subjected to a steady sinusoidal input. Sweeping through the frequency range of interest gives rise to the S in SFRA, to distinguish it from impulse methods, which estimate the response rather than measure it.

SFRA is a proven technique for making accurate and repeatable measurements. As compared to the “impulse” technique, SFRA is preferred for frequency domain measurements. It covers the full dynamic range and maintains the same energy level for each frequency, providing accurate, consistent results. A high signal-to-noise ratio across the entire 20 Hz to 2 MHz frequency rang

Doble’s M5000 series uses sweep frequency response analysis to detect mechanical failure or movement of windings from short circuits, mechanical stresses, or transportation. The instruments send an excitation signal into the transformer and measure 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.

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