Megger FRAX150 Sweep Frequency Response Analyzer

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Megger FRAX150
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FRAX150 Datasheet
The Megger FRAX150 Sweep Frequency Response Analyzer (SFRA) detects potential mechanical and electrical problems that other methods are unable to detect. Major utilities and service companies have used the FRA method for more than a decade. The measurement is easy to perform and will capture a unique “fingerprint” of the transformer. The measurement is compared to a reference “fingerprint” and gives a direct answer if the mechanical parts of the transformer are unchanged or not. Deviations indicate geometrical and/or electrical changes within the transformer.
Megger FRAX150 Features
  • Highest dynamic range and accuracy in the industry
  • Built-in PC with powerful backlit screen for use in direct sunlight
  • Highest possible repeatability by using reliable cable practice and high-performance instrumentation
  • Fulfills all international standards for SFRA measurements
  • Advanced analysis and decision support built into the software
  • Imports data from other FRA test sets


FRAX150 detects problems such as:
  • Winding deformations and displacements
  • Shorted turns and open windings
  • Loosened clamping structures
  • Broken clamping structures
  • Core connection problems
  • Partial winding collapse
  • Faulty core grounds
  • Core movements
Megger FRAX150 Specs

Specifications are valid at nominal input voltage and an ambient temperature of +25°C, (77°F).

Application field

The instrument is intended for use in medium and high-voltage substations and industrial environments.

Ambient temperature
Operating -20°C to +50°C (-4°F to +122°F)
Storage -20°C to 70°C (-4°F to +158°F)
Humidity <90%RH, non-condensing
Mains voltage 90 – 264 V AC, 47 – 63 Hz
Dimensions 305 x 194 x 360 mm (12" x 7.6" x 14.2")
Weight 6 kg (13 lbs)
FRA Method Sweep frequency (SFRA)
Frequency range 0.1 Hz – 25 MHz, user selectable
Number of points Default 1046, User selectable up to 32,000
Measurement time: Default 64 s, fast setting, 37 s (20 Hz – 2 MHz)
Points spacing Log., linear or both
Dynamic range/Noise floor >130dB
Inaccuracy ±0.5 dB down to -100 dB (10 Hz – 10 MHz)
IF bandwidth/Integration time User selectable (10% default)
Software FRAX for Windows 2000/ XP/Vista/7
Standards / guides

Fulfill requirements in Cigré Brochure 342, 2008 Mechanical condition assessment of transformer windings using FRA and Chinese standard DL/T 911-2004, FRA on winding deformation of power transformers, as well as other international standards and recommendations

Analog Output
Channels 1
Compliance voltage 0.2 – 24 V p-p
Measurement voltage at 50 Ω 0.1 – 12 V p-p
Output impedance 50 Ω
Protection Short-circuit protected
Analog Input
Channels 2
Sampling Simultaneously
Input impedance 50 Ω
Sampling rate 100 MS/s
Operating system Windows® based
Memory 1000 records in internal memory External storage on USB stick