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FRAX
© 2011 Megger Sweden AB
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FRAX
Congratulations to your choice of FRAX Sweep Frequency Response Analyzer by Megger. We
at Megger have done our best and will continue do our best to satisfy our customers. Please
visit our home page at www.paxdiagnostics.com and do not hesitate to contact us directly.
Most dielectric and mechanical failures in large power transformers are preceded by
mechanical changes in the winding structure. These displacements in the winding structure
may be the result of transportation damage, short circuit forces, or natural aging effects on
the insulating structures used to support the windings. Detection of these displacements
before dielectric failure reduces maintenance costs, and improves system reliability.
FRAX Sweep Frequency Response Analyzer (SFRA) is designed to detect winding
displacements in power transformers or faults in the magnetic core. The system provides
attenuation signature curves that can easily be compared for deviations which indicate:
Core movements
Winding deformations and displacements
Faulty core grounds
Partial winding collapse
Hoop buckling
Broken or loosened clamping structures
Shorted turns and open windings
Unique features of FRAX:
High accuracy
Small size and low weight
Powerful analysis tools that are intuitive and easy to use
Wireless, Bluetooth, communication between laptop an instruments allows flexibility in the
field (FRAX-101 only)
Galvanic isolated USB interface for personnel and equipment safety
More safety and technical details are given in the following sections:
Safety First
FRAX Technical Specifications
Instrument panels: Front, Rear
Sweep Frequency Response
Test System Verification
Calibration
Disposal
1.1 Safety First
FRAX is a Sweep Frequency Response Analyzer designed for measuring of power transformers
in the field and at manufacturing sites.
Always follow local safety regulations.
Make certain that all personnel working with FRAX instrument have been trained in its use
and that all applicable safety precautions are taken.
Always connect the instrument to protective earth/ground using the separate earth/ground
cable. The earth/ground cable should be the first connection made and the last removed.
Do not use any accessories that are not intended for use together with the FRAX.
Refer all servicing to qualified personnel.
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