The FRA 5311 Sweep Frequency Response Analyser detects transformer winding movements and mechanical failures due to mechanical shock, transportation or short circuits as defined in the IEC 60076-18. It can also be used for diagnostics on rotating machines. Many dielectric and mechanical failures are preceded by mechanical changes in the winding structure.

The circuit of a transformer winding is a complex R-L-C network. The measured frequency response (transfer function) of this network is unique like a fingerprint. Changes in the winding geometry generated by mechanical forces (ex. during transport or after a short circuit) will be reflected by deviations between repeated measurements. Even small winding movements or distortions will cause legible changes in the measured transfer function, which is clearly detectable.

The FRA 5311, the smallest and lightest device in the industry, is extremely easy to use. Just plug it to a USB port in the computer (for communications and power), start the windows based software and perform the test. The clever grounding connection guarantees measurement repeatability even up to high measuring frequencies.

The additional analysis mode allows easy comparison between curves. In addition measurements from other FRA manufacturers can be loaded by using the IEC 60076-18 recommended XML format, or by importing them directly (most common FRA manufacturers available).

Advantages
• Measurements results fulfill the industry standards.
• Reliable results.
• Can be carried easily on site.
• Easy to setup by connecting the USB to a computer. The specially designed clamps, twin BNC cables for generator and source, and clever ground connection system makes the connection faster than any other available device.
• Find faults easily by using the analysis mode with curves comparison, cursors and zooming capabilities.
• Analyse results at the office even if no measuring device connected, the analysis mode software runs in any windows computer. Export data to your own complete transformer test report. Data can be exported as CSV and can be opened by MS Excel or MS Word. Curves are stored as pictures.
• Avoid wrong measurements by using the predefined complete transformer test sequence.
• Comparison with measurements done with other devices posible inside the FRA 5311 software.

Applications

Routine test and on site diagnostic of:
•               Power and distribution transformers
•               Rotating machines
•               Any R, L, C or RLC two terminals test object