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Sweep frequency response analyzer-SFRA

Power transformers are some of the most vital components in today’s transmission and distribution infrastructure. Transformer failures cost enormous amounts of money in unexpected outages and unscheduled maintenance. It is important to avoid these failures and make testing and diagnostics reliable and efficient.Sweep Frequency Response Analysis (SFRA) is a powerful & sensitive method to evaluate the mechanical integrity of core, windings & clamping structures within power transformers by measuring their electrical transfer functions over a wide frequency range

Adiradh Energy offers Sweep frequency response analyzer (SFRA)  Models FRAX101-FRAX99-FRAX150  detects mechanical and electrical changes of the core and winding assembly of power transformers. Major utilities and service companies have used the FRA method for more than a decade and the method is covered in international standards. The measurement is easy to perform and will capture a unique fingerprint of the transformer. The measurement result is compared to a reference fingerprint and gives a direct answer if the mechanical parts of the transformer are unchanged or not. Deviations indicate in Sweep frequency response analyser available in  India ,Hyderabad,chennai, Bangalore ,  Bhubaneswar,pune ,Delhi,Mumabi,Noida ,Broda and others geometrical and/or electrical changes within the transformer.


Sweep frequency response analyser-Frax 101

Ordering Information for FRAX 101 in India 

FRAX-101 With accessories, 18 m  cable set Art. No:AC-19090

FRAX-101 With accessories, 9 m   cable set Art. No:AC-19092

FRAX-101 With accessories, with accessories incl. battery, 18 m cable set cable set Art. No:AC-19091

FRAX-101 With accessories, with accessories incl. battery, 9 m cable set cable set Art. No:AC-19093


FRAX 99 Sweep Frequency Response Analyzer

Sweep Frequency Response Analyzer -Frax 99

Ordering Information for FRAX 99 in India 

FRAX-99 With accessories, 18 m  cable set Art. No:AC-29092

FRAX-99 With accessories, 9 m   cable set Art. No:AC-29090

FRAX-99 With accessories, with accessories incl. battery, 18 m cable set cable set Art. No:AC-29096

FRAX-99 With accessories, with accessories incl. battery, 9 m cable set cable set Art. No:AC-29095



SFRA-Sweep Frequency Response Analyzer-FRAX 150

Sweep Frequency Response Analyzer-FRAX 150

Ordering Information for FRAX 150 in India 

FRAX-150 With accessories, 18 m  cable set Art. No:AC-39090

FRAX-150 With accessories, 9 m   cable set Art. No:AC-39092

Brochure for Sweep Frequency Response Analyzers SFRA FRAX101-FRAX99-FRAX150 Download

SFRA detects problems

  • Winding deformations and displacements
  • Shorted turns and open windings
  • Broken clamping structures
  • Core connection problems
  • Partial winding collapse
  • Faulty core grounds
  • Core movements

SFRA  FRAX Series  Key features 

  • Smallest and most rugged FRA instrument in the industry.
  • Guaranteed repeatability by using superior cabling technology and standardized signal cable grounding     technique (IEC 60076-18, Method 1).
  • Fulfills international standards for SFRA measurements   (IEC   60076-18,IEEE C57.149 etc).
  • Highest dynamic range and accuracy in the industry allowing even the most subtle electro-mechanical changes  within the transformer to be detected.
  • Advanced analysis and support software tools allows for sound decision making with regard to further diagnostics  analysis and/or transformer disposition.
  • Built-in PC with touchscreen (FRAX 150)
  • Advanced analysis and decision support built into the software. FRAX 150 with built in PC and touchscreen
  • Imports data from other FRA test sets
  • Wireless communication (FRAX 101)
  • Battery operated (optional FRAX 99 and FRAX 101)
  • Continuity control of ground connections (FRAX 101 and 150)
Transformers consist of multiple complex networks of capacitances and resistors that can generate a unique signature when tested at discreet frequencies and plotted as a curve. Sweep frequency response analyser  have features Frequency Range: 0.1 Hz – 25 MHz, user selectable, Dynamic Range/Noise Floor: >130d, Wireless communication and many others. FTB101 Several international FRA guides recommend verification integrity of cable and instrument before and after a test using a test circuit with a known FRA response supplied by the equipment manufacturer. FRAX comes with a field test box.FTB101 as a standard accessory and allows the user to perform this important validation in the field at any time and secure measurement quality
SFRA signature

Sweep frequency response curve -SFRA curve

Standards for Sweep frequency response analsyer
The IEEE guide for SFRA is IEEE C57.149 Guide for the Application and Interpretation of Frequency Response Analysis for Oil-Immersed Transformers. Other relevant SFRA documents include: IEC60076-18 Ed. 1 – 2012, Std. DL/T911-2004, and Cigré Technical Brochure No. 342, April 2008.
Difference between SFRA-Sweep frequency response analyser ,DFR-Dielectric frequency response &DFR-FRSL-Frequency Response of Stray Losses
power factor or tan delta test. traditionally  has been performed at line frequency 50 Hz only. It is a useful tool for assessing the health of (most of) the insulation systems of a transformer, but it has several shortcomings. Many of these can be eliminated by repeating the test over a range of frequencies A less well-known example is a short-circuit impedance measurement.This is typically used to look for winding deformation by evaluating the so-called leakage reactance. When this measurement is repeated at several frequencies, typically between 1 Hz and 500 Hz, with the focus on the resistive component of the results, unique diagnostic information becomes available. This is the FRSL technique..A common mistake is to confuse dielectric frequency response (DFR) and frequency response of stray losses (FRSL) tests with sweep frequency response analysis (SFRA) tests.Unfortunately, the tests are most definitely not the same and, while SFRA provides a lot of diagnostic information, it is not a substitute for the information provided by the other frequency-based tests. SFRA and DFR are two completely different tests. SFRA looks at any kind of mechanical changes inside the transformer whereas DFR is used to determine the moisture present in cellulose (solid insulation) of oil filled power transformers. The two tests have very different applications.SFRA test set FRAX Series  provides FRSL results concurrent with an SFRA short-circuit test measurement.


Adiradh Energy offer Sweep frequency response analysers  FRAX99, FRAX150,FRAX101  in  India;Hyderabad; Visakhapatnam; Vijayawada; Chennai; Puducherry; Trichy; Coimbatore; Hosur; Bangalore; Hubli; Mysore; Cochin; Kolkata; Pune; Goa; Mumbai; Thane; Kanpur; Jaipur; Nagpur; Delhi; Noida; Gurugam; Bhopal; Vadodara; Ahmedabad;Chandigarh;Chandigarh;Tata Nagar; Raipur; Rudrapur;; Durgapur; Kharagpur;Raigarh; Bhilai;Angul; Haldia;Jabalpur;Indore;Jamshedpur; Rajahmundry; Bokaro Steel City;salem;kochi; Rourkela; Ahmedabad ;Jamnagar; Bharuch; Sri City ; Nashik;Haridwar;Mathura;Aurangabad;Bhubaneswar and other cities


SFRA testing on transformers