Sfra is a comparative method, meaning an evaluation of the transformer. Main core deformation, open circuits, shorted turns, residual magnetism. The results are analyzed to reveal issues with the transformers internal components including the core, windings, tap leads and connections. These tests show, in trace form, the winding transfer function of the transformer and are valuable to determine if any damage has occurred during shipping. This is a proven technique for making accurate and repeatable measurements. By using the latest proven sfra test techniques, it is possible to accurately assess transformer condition without dismantling it. Applying the ptm software as support tool for the entire measurement process. Dynamic frequency response analysis in realtime on a motor drive system is unique among mcu suppliers and is currently capable only on c2000 mcus.
Preparing and performing sfra measurements on power transformers. Frax99, frax101 and frax150 sweep frequency response analyzers. Sfra testing on transformers dismantling a power transformer to determine its condition is hardly ever a practical possibility. The 2 top free and the 3 top not free softwares for statiscal data analysis are listed here. The test methods used by the authors for presenting the results are described.
A sfra open circuit test will show the response of core and windings, while a sfra short circuit test only shows the response of windings. Time based current sfra result will be compared to previous result of the same case. Sfra analysis tools visualgraphical analysis starting db values for open excitation impedancecurrent short shortcircuit impedance the expected shape of star and delta configurations comparison of fingerprints from. The response is measured on the other end of the winding u2f. This test is very reliable for condition monitoring of physical condition of transformer windings. Ultrasonic acoustic contact fault internal partial discharge, arcing, sparking, loose ultrasonic detectors and detection shields, poor bushing connections, bad tap changer analysis. May 28, 2018 new manual sweep frequency response analysis sfra test for franeo 800. Dualaxis motor control using fcl and sfra on a single c2000 mcu. Type based sfra of one transformer will be compared to an equal type of transformer. Power transformer sweep frequency response analyzer sfra 3 phase transformer sweep frequency response analyzer product description the transformer winding deformation tester is used for power transformer with voltage grade of 6kv and above and other transformers with special purpose. Freescale semiconductor techniques and tools for software analysis, rev. Advanced analysis and decision support built into the software imports data from other fra test sets the frax series of sweep frequency response analyzers sfra detects potential mechanical and. The test in progress and system ok indicator lights go out.
The m5200 sfra windows based software includes analysis tools that help. Mike horning explains why an sfra test is essential to a transformer maintenance program. Frax99, frax101 and frax150 sweep frequency response. Sep 18, 2017 sweep frequency response analysis test or in short sfra test can detect efficiently, displacement of transformer core, deformation and displacement of winding, faulty core grounds, collapse of. A short circuit measurement is made with the same sfra test lead connections as an open circuit measurement, but with the difference that another winding is short circuited. Sweep frequency response analyzer sfra user guide doble engineering company 85 walnut street watertown, massachusetts 024724037 usa. Frax99, frax101 and frax150 electrical test equipment.
Sfra test results, when performed correctly and under similar conditions correct grounding, same tap position and similar connections, are comparable. The software also provides an analytical tool that can perform correlation coefficients between two traces per the ieee c57. Gdrbf transformer winding deformation tester adopts sweep frequency response analysis sfra method and impedance method to detect transformer winding movements and mechanical failures due to mechanical shock, transportation or short circuits, with features of fast test speed, high frequency stability and powerful analysis software. Transformer winding deformation analysis using sfra. Interpretation of sweep frequency response analysis sfra. Flexible configuration of the measurement traces depending on your needs. C2000 software frequency response analyzer sfra library users guide sfra graphical user interface to display the frequency response analysis results scripts to import sfra data into matlab example software test bench project to quickly evaluate sfra library 2. The results are analyzed to reveal issues with the transformers. The sfra45 from n4l is a sweep frequency response analyser with a bandwidth of 5hz to 45mhz. Nov 17, 2019 sweep frequency response analysis test or in short sfra test can detect efficiently, displacement of transformer core, deformation and displacement of winding, faulty core grounds, collapse of partial winding, broken or loosen clamp connections, short circuited turns, open winding conditions etc. Use the doble m5400 sweep frequency response analysis test set to investigate mechanical integrity of transformers, reactors and other equipment consisting of windings. The same transformer symmetry a sister transformer symmetric phases. Sweep frequency response analysis sfra test procedure.
Advanced analysis and decision support built into the software imports data from other fra test sets the frax series of sweep frequency response analyzers sfra detects potential mechanical and electrical problems that other methods are unable to detect. Sweep frequency response analysis test as tool for distribution. Tests can be automatically assessed in accordance with the. Risk analysis in software testing is an approach to software testing where software risk is analyzed and measured. The latest sfra test sets make these techniques more accessible, more convenient and. Sfra45 sweep frequency response analyser n4l caltest. R r is a free software environment for statistical analysis and graphics. Sweep frequency response analysis test sfra test electrical4u. The sweep frequency response analysis sfra is an analysis technique for detecting winding displacement and deformation among other mechanical and electrical failures on power and. These tests help you narrow down the areas where the problem might be. The winding to be tested will be kept in open circuit both primary and secondary the test sinusoidal voltage v i is. Franeo 800 is operated with the primary test manager ptm software, the. The winding of transformer or alternator rotors may be exposed to mechanical stresses during unsafe transportation, lightning impulse, heavy short circuit faults, transient.
Meggers frax software has the unique capability to import previous results from any other manufacturers test set and compare results. Sweep frequency response analysis electrical test equipment. The sfra 5000 offers both high precision and portability in a single package, providing all the accessories required for fast, easy to use, reliable and repeatable measurements. Traditional software testing normally looks at relatively straightforward function testing. The technique of sfra is a major advance in transformer condition monitoring analysis. Electrical test equipment power station to plug megger. The instrument sends an excitation signal into the transformer and measures. Franalyzer uses the sfra principle sweep frequency response analysis a worldwide proven method for measurements in frequency domain. New manual testing mode for sfra tests on different assets, for example, rotating machines. It uses the sweep frequency response analysis sfra principle and measures the electrical transfer function over a wide range of frequencies. Sweep frequency response analysis sfra is a method to evaluate the mechanical integrity of core, windings and clamping structures within power transformers by measuring their electrical transfer. The sfra45 offers a fully portable solution for the field of sfra sweep frequency response analysis which fully complies with iec6007618 power transformers part 18 measurement of frequency response. Sfra 5000sweep frequency response analyzer altanova group.
If you measure the frequency response of a winding then you can identify winding movement. According to 3 sfra method determines the transformer responses in a time or frequency area. The instrument sends an excitation signal into the. C2000 software frequency response analyzer sfra library users guide sfra graphical user interface to display the frequency response analysis results scripts to import sfra data into. Each frequency range corresponds to dfferent components in the transformer. M5400 sweep frequency response analysis doble engineering co.
Frequently asked sweep frequency response analysis. Turn on the sfra test instrument and wait 20 seconds. Transformer winding deformation analysis using sfra technique. The frax series of sweep frequency response analyzers sfra. Traditional software testing normally looks at relatively straightforward function testing e. By using the latest proven sfra test techniques, it is possible to accurately.
The sfra open circuit test looks at the response of the core and winding, and the sfra short circuit test isolates the winding response of the transformer. C2000 software frequency response analyzer sfra library. Sfra fra500 dv power dv power smart test instruments. Sfra 5000 sweep frequency response analyzer sinetec. To obtain the password for extracting software and documents available on this page, contact your doble engineer or send an email to sfra.
This is very reliable and sensitive method or tool for condition monitoring of the physical condition of transformer windings. Each frequency range corresponds to dfferent components in the. A short circuit measurement is made with the same sfra test lead connections as an open circuit measurement, but with the difference that another winding is short. Use the doble m5400 sweep frequency response analysis test set to investigate mechanical integrity of. Predefined generic measurement templates for fast test preparation. Jun 17, 2015 the m5400 uses sweep frequency response analysis, a proven technique for making accurate and repeatable measurements. The sfra45 offers a fully portable solution for the field of sfra. Power transformer sweep frequency response analyzer sfra 3 phase transformer sweep frequency response analyzer product description the transformer winding deformation tester is used for power. Interpreting sweep frequency response analysis measurements.
The software guides you through the testing process with comprehensive testing procedures and detailed wiring diagrams. The m5400 uses sweep frequency response analysis, a proven technique for making accurate and repeatable measurements. Sfra test is nothing but a sweep frequency response analysis, which is used to find out the physical condition of transformer windings, alternator rotors windings etc. It uses the sweep frequency response analysis sfra principle and measures. Without the need for a pc to compare transformer fingerprints, the sfra 5000 decreases test time enabling the engineer to complete testing in a much shorter period of time than previously possible. Core grounds, core displacement, and other core and winding problems can be revealed by this test. Gdrbf transformer winding deformation tester adopts sweep frequency response analysis sfra method and impedance method to detect transformer winding movements and. One of these is sweep frequency response analysis sfra where low voltage, multifrequency sweeps are performed on the transformer. A software risk analysis looks at code violations that present a threat to the stability, security, or performance of the. These tests show, in trace form, the winding transfer function of the transformer and are valuable to determine if any damage has occurred during shipping or during a through fault. Sweep frequency response analysis sfra is a method to evaluate the mechanical integrity of core, windings and clamping structures within power transformers by measuring their electrical transfer functions over a wide frequency range. The sfra test presents a quick and cost effective way to assess if damages have occurred or if the transformer can safely be energized again. The power transformer of rating 10 kva, 1 v440 v, 3phase, 50 hz, dyn11 has been specially developed inhouse for carrying out sfra testing by.
Using the released fcl algorithm for this device and the software frequency response analyzer sfra. Sweep frequency response analyzer sfra 5000 is a standalone sweep frequency response analyzer for the high accuracy transformer analysis and integrates the sts and td 5000 family test sets. Sweep frequency response analysis test or in short sfra test can detect efficiently, displacement of transformer core, deformation and displacement of winding, faulty core grounds, collapse of partial winding, broken or loosen clamp connections, short circuited turns, open winding conditions etc. Sfra 5000 is a standalone sweep frequency response analyzer for the high accuracy transformer analysis and integrates the sts and td 5000 family test sets. Analysis of the results, which are in the form of frequency response traces can, however, be daunting to new users. The winding to be tested will be kept in open circuit both primary and secondary the test sinusoidal voltage v i is applied between the winding to ground from one end and the corresponding output voltage v o will be measured between other end to ground. We can perform sfra test in different ways but mostly used methods are discussed as fallows. Dualaxis motor control using fcl and sfra on a single. Dv fra software can directly import and playback doble, megger and omicron sfra test records allowing the user to compare the fra500 test records against other devices on the market. Franeo 800 was developed for testing the mechanical and electrical integrity of power transformers after transportation or exposure to high fault currents.
Sweep frequency response analysis sfra proceeds by applying a sinusoidal signal of constant amplitude and variable frequency to one end of the winding under test u1f. Dobles sfra technology provides a view to see inside the transformer without. One software testing concept that beginning software test engineers often dont fully understand is the difference. The main objective of this paper is to present sweep frequency response analysis sfra test as an alternative to assess the mechanical condition of.
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