NRBX Sweep Frequency Response Analyzer is based on the measurement of the windings characteristic parameters inside the transformer the tester using the world's developed countries sound internal fault frequency response analysis (FRA) method able to make an accurate internal transformer fault judgment.
After the completion of the design and manufacture transformers coils and its internal structure to be finalized therefore a transformer coil winding if the voltage level method of winding are the same each coil corresponding parameters (Ci Li) is determined. Thus the frequency domain response characteristics of each coil also will determine among the corresponding three-phase coil has a comparable frequency spectrum.  
It occurs inter-turn phase short circuit during the test or collision during transport causing the coil relative displacement and during operation under short circuit and fault conditions due to the tension caused by the electromagnetic coil is deformed it will make the distribution parameters of the transformer windings changes. Thus influent and change the existing frequency domain transformer frequency response feature that frequency response amplitude changes occur and resonance frequency shift etc. NRBX applies to the internal structure of fault detection 63kV ~ 500kV power transformers.
FRA quantization process transformer internal winding parameters response changes in the different frequency domain according to the value of the change magnitude frequency response magnitude change regional and response trends to judge the transformer internal windings degree of change in turn can determine whether the transformer has been severely damaged need to overhaul measurement.
For the running transformer regardless of whether there is a saved frequency domain feature picture in the past by comparison the difference between fingerprints of fault transformer coil can also judge the degree of fault. Of course if you save a set of transformer windings original characteristic graph easier for the operation of transformers maintenance and inspection after the accident analysis and provide a strong basis more accurate.
FRA from the laptop and chip microprocessor precision measurement systems compact easy to operate with comprehensive test analysis function.
 

Product character
• Use high-speed high integration microprocessor to sample and control.
• Use USB to connect the notebook PC and device.
• Communication wireless Bluetooth interface between the laptop and instruments.
• Hardware cassette mechanism adopts DDS (from America) can correctly detect the breakdown :distortion swell shift tilt inter-turn short circuit deformation and contacting short circuit inter-phase. 
• High-speed dual channel 16 bit A/D sampling (the wave from curve will change obviously if change the tapping switch during the field tests.).
• The software can adjust the output signal range the maximum amplitude peak±10V.
• The computer automatically generating the test results to be Word document.
• Use precision high stability components the same phase repeat test measurement repetition rate > 99.5%.
• Finished circuit boards surface specially treatment with anti-water pollution and harmful gases.
• The device with two measurement system: linear scan and sectional scan.
• Amplitude-frequency characteristic comply the national technical specifications.
• Test data automatic analysis system horizontal compare the similarity of AB C the results as below:
      (1) conformance is very good
      (2) conformance is good
      (3) conformance is bad
      (4) conformance is very bad 
Vertical compare A-A B-B C-C obtain the original data to compare the winding deformation with the test data in the same phase the results as below:
      (1) normal
      (2) slight deformation
      (3) moderate deformation
      (4) serious deformation 
• Automatically generating Word document，convenient for customers to save and print.
• Fully meet the electricity standard DL/T911-2004 " power transformer winding deformation Frequency Response Analysis" technical conditions.