FRA500 - Sweep Frequency Response Analyzer

Sweep Frequency Response Analyzer FRA500

Sweep frequency response analysis (SFRA) is a method 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.

FRA500 injects a sine wave signal with constant amplitude and variable frequency, with user-selectable voltage from 0,2 Vpp to 24 Vpp and frequency from 0,1 Hz to 25 MHz, to one side of a transformer winding. The amplitude and phase angle values of the reference signal are compared with the corresponding values of the measured signal from the second side of the winding.

The ratio of the measured signal and reference signal magnitude is graphically displayed in dB through the full sweep frequency. Mechanical or electrical changes in a transformer are detected by comparing frequency response measurement fingerprints.

The FRA500 can be used to detect power transformer problems such as:

• Shorted turns or open windings.
• Winding displacement or deformations.
• Core movements.
• Winding connection problems.
• Broken clamping structures.

A typical test sweep time, with frequency ranging from 20 Hz to 2 MHz, using FRA500 is less than 20 seconds. The Quick Sweep feature allows the user to verify cable connection integrity and earthing in 10 seconds.

Each FRA500 is delivered with Windows-based Sweep Frequency Analysis (DV FRA) software for conducting tests and capturing data. The software can compare test results as magnitude vs. frequency, in-phase vs. frequency, or both graphs at the same time. It also provides an analytical tool for correlation coefficients between two traces per IEEE C57.149 – 2012 or DL/T 911-2004.

DV FRA Software can directly import and playback Doble, Megger, and Omicron SFRA test records, allowing users to compare FRA500 test records against other devices on the market. To eliminate the use of long cables, FRA500 can be battery-operated as an option and includes Bluetooth communication.

Specifications