FRAnalyzer
Contents
1. d OMICRON FRAnalyzer Sweep Frequency Response Analysis SFRA The OMICRON FRAnalyzer detects mechanical and electrical changes of the core and winding assembly of power transformers By finding winding or core defects after faults mechanical shocks e g earthquakes or transportation it offers a valuable opportunity to improve the reliability of transformers to reduce maintenance costs and most of all to avoid expensive unexpected outages What Is FRA Frequency Response Analysis FRA is a powerful and sensitive 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 OMICRON uses the SFRA principle sweep frequency response analysis a worldwide proven method for measurements in frequency domain The SFRA is a comparative method i e an evaluation of the transformer condition is done by comparing an actual set of SFRA results to reference results Three methods are commonly used to assess the measured traces gt time based current SFRA results will be compared to previous results of the same unit gt type based SFRA of one transformer will be compared to a type equal one gt phase comparison SFRA results of one phase will be compared to the results of the other phases of the same transformer When to Use SFRA Typical applications of SFRA measurements are Tran2. SNR With one look the user can get an overview of the magnitude gain and phase angle of the transformer s transfer function It is possible to group the shown traces e g just HV measurements or just the results of the tertiary winding Cursors are available as well as an easy to use zoom functionality A copy to clipboard function allows a fast Insertion of full or zoomed trace pictures into office documents etc Despite the predefined sweep mode the traces can be displayed in linear or logarithmic scaling to observe every part of the trace in a useful way OMICRON The Reference Principle After the measurement a reference test can be defined This can be a fingerprint of the same transformer or measured data of various sister transformers Of course it is also possible to compare the traces measured on different phases of a transformer without setting a omer reference test Low bequency vr NEHEN Makma T Ktr corens OPEN Implemented Assessment Tool Mamam ce oo The FRAnalyzer provides the user a mathematical solution for a comparison of the traces based on the standard DL 911 2004 Scientific investigations and experience have proven this method to be reliable and sensitive Therefore the implemented algorithm provides a powerful tool for a fast assessment of the test data Data Storage Export Import All measured data is stored within a supplied database This ensures a time effective dat
3. OMICRON SFRA User Forum Effective practice oriented trainings offered at OMICRON training centers or on site at your location Phase which can be compared to reference data Deviations indicate geometrical and or electrical changes within the transformer No additional data processing is required due to a direct measurement in the frequency domain Your Benefits gt SFRA Is a non intrusive test method easy and fast to perform gt SFRA also covers low frequencies and thus can detect core faults shorted or open turns gt Direct measurement in frequency domain as opposed to the time domain measurement method thus no further mathematical handling of data is necessary gt Increasing possibilities for SFRA knowledge transfer and improvement of method through growing number of users and scientific research efforts Power Transtormer Core amp Winding Diagnosis What Problems Can Be Detected The FRAnalyzer can detect problems such as winding deformation axial amp radial like hoop buckling tilting spiraling displacements between high and low voltage windings partial winding collapse shorted or open turns faulty grounding of core or screens core movement broken clamping structures problematic internal connections oo ma fs MI al i How Does It Work Each electrical network has got Its unique frequency response Therefore it is us
4. a handling and avoids the problems typically arising with file storage systems for a large number of tests These stored data can easily be arranged and sorted by several parameters An easy to handle export function enables the user to store the data additionally in different formats such as CIGRE Exchange Format xfra or csv which can be imported into MS Excel The FRAnalyzer software also allows the import of other manufacturers data in their specific formats such as Doble FRAMIT FRAX etc Failure clearly identified by the assessment tool Your Benefits The Auto Report Function gt Fast easy efficient handling through the user The FRAnalyzer software automatically generates a test interface report within seconds It can be printed out or stored gt High flexibility due to freely selectable sweep in pdf format or MS Excel It contains all information settings about the transformer the test all traces and assessment Cost saving due to Included database solution results Included assessment tool saves money otherwise spent on expert analyses gt Easy localization to global market via different language packages Effective work due to the fast auto reporting Helpful connection schemes support the unexperienced user to make the right connections Easy to use comparison of multiple tests Increased Import and export functionality The one box Solution The complete FRAnalyzer package comes in a fir
5. assessment algorithm gives the user a powerful tool for a fast analysis of the results The auto report functionality generates a complete report within seconds en oe o Getting Started Eee Usually the test sequence starts with the establishment of the transformer to be tested The nameplate data will be stored with all measured data The terminal markings can be chosen from different templates such as IEC or ANSI If there is older data of the same transformer fingerprint available in the database this test can be used as a template d I T l tl Based on transformer type and vector group a test sequence Is suggested Other sequences can also be added and changed freely and individually The new Connection Scheme shown in the upper right screenshot Is an ideal easy to use graphical support for unexperienced users for a proper assignment of the connections The preview pane gives a quick overview of Curves Sweep Settings Any test with the FRAnalyzer is performed with a sweep settings profile These profiles are fully customizable and can be set for any test individually In contrast to other instruments the spacing of the FRAnalyzer measurement points sweep mode can be logarithmic or linear there can also be generated as many frequency sub ranges as needed In addition to the number of points the receiver bandwidth can be adjusted to achieve an optimal signal to noise ratio
6. asurements with test templates Advanced visualization and analysis of test results Assessment of the measuring results Database handling VV VV VV Reporting OMICRON Ordering Information VEO00660 FRAnalyzer complete set The set consists of the following accessories can also be ordered separately one piece per order no Order No Qty Description VEHKO660 1 Coaxial Cable Red with Cable Drum 18 m 59 ft VEHKO661 1 Coaxial Cable Blue with Cable Drum 18 m 59 ft VEHKO662 1 Coaxial Cable Yellow with Cable Drum 18 m 59 ft VEHZ0661 4 Aluminum Braid Rolls 5 m 16 ft VEHK0615 1 Grounding Cable 6 mm gn ye 6 m 20 ft VEHZ0662 4 Screw Clamps for Aluminum Braid VEHZO664 2 VEHZ0667 1 VESDO662 1 VEHZ0659 1 VEHZO657 1 1 Bushing Clamps BNC Adapter Set User Manual Power Supply and Battery Charger Crank Handle FRAnalyzer Software Additional Accessory for FRAnalyzer VEHZ0673 Clamps Set for Short Bushings consisting of 2 short aluminum braids 1 5 m 5 ft 2 clamps and 1 carry bag VESMO661 FRAnalyzer Software Upgrade to 2 0 for users of older software versions than 2 0 11 OMICRON is an international company serving the electrical power industry with innovative testing and diagnostic solutions The application of OMICRON products provides users with the highest level of confidence in the condition assessment of primary and secondary equipment on their systems Services offered in the area of
7. consulting commissioning testing diagnosis and training make the product range complete Customers in more than 130 countries rely on the company s ability to supply leading edge technology of excellent quality Broad application knowledge and extraordinary customer support provided by offices in North America Europe South and East Asia Australia and the Middle East together with a worldwide network of distributors and representatives make the company a market leader in Its sector For a detailed list of literature currently available please visit the Literature amp Videos section of our website Americas Asia Pacific Europe Middle East Africa OMICRON electronics Corp USA OMICRON electronics Asia Limited OMICRON electronics GmbH 12 Greenway Plaza Suite 1510 Suite 2006 20 F Tower 2 Oberes Ried 1 Houston TX 77046 USA The Gateway Harbour City 6833 Klaus Austria Phone 1 713 830 4660 Kowloon Hong Kong S A R Phone 43 5523 507 0 1 800 OMICRON Phone 852 2634 0377 Fax 43 5523 507 999 Fax 1 713 830 4661 Fax 852 2634 0390 info omicron at info omicronusa com info asia omicron at OMICRON L179 Mai 2010 Subject to change without notice www omicron at www omicronusa com
8. m arrangement every component has its place The complete package is designed for field use and has successfully passed vibration shock and climatic resistance tests by an independent and accredited test laboratory Technical Data General Frequency range 10 Hz bis 20 MHz selctable Meas point spacing logarithmic linear or both Calibration interval every 3 years Source Output FRA method Output impedance Sweep frequency 509 BNC double shielded 2 83 V p p 1 Vrms at 50 Q load max 3 201 user selectable Connector Amplitude Number of meas points Inputs Reference CH 1 Measurement CH 2 Impedance low 50 Q or high impedance 1 MQ selectable Connector BNC double shielded gt 120 dB lt 0 1 dB down to 50 dB and 1 dB between 50 dB und 80 dB Dynamic range Accuracy 10 Enviromental Operating ambient temperature dat GZ F ea 130 E Operating relative humidity 20 95 non condensing Mechanical data supply voltage Weight lt 2 kg without measuring cables Dimensions 26 5 26512 10 25 2X 10 5 0 W x H x D DC power supply DC 10 V to 24 V 10 W AC power supply AC 100 V to 240 V 50 to 60 Hz PC requirements minimum USB 1 1 Windows 2000 Windows XP or Windows Vista 32bit Interface PC operating system Processor Pentium 1 GHz Memory 256 MB RAM Drive CD ROM PC Software OMICRON FRAnalyzer for Operation of the FRAnalyzer Me
9. ons produce identical results regardless of the external noise level Only a very high degree of repeatability can ensure that even small deviations of compared SFRA traces are related to changes within the observed transformer and not to inaccuracies within the measurement setup According to the standard of knowledge the connections between the measuring device and the transformer terminals as well as the grounding technique have a key influence on reproducibility Unique Connection Technique In close cooperation with leading Universities in the field of FRA testing on power transformers OMICRON has developed a sophisticated connection solution to achieve highest possible repeatability of the results Specially designed screw type connection clamps provide reliable electrical contact to the transformer The FRAnalyzer uses double shield coax cables RG223U to ensure the highest available signal to noise ratio SNR To enable the grounding of the coaxial cable shields at the transformer housing which is the reference potential an additional connection from the terminal adapter to the transformer tank Is required A poor grounding technique can lead to unreproducible and therefore unusable SFRA results In order to achieve the best possible SFRA measurements the grounding connections should be of lowest inductance and provide a large surtace area Therefore the use of braids which are less sensitive to interfe
10. rences and make the measurement independent from the cable positioning is strongly recommended The Double Braid Concept OMICRON provides a double braid solution which forms a shield around the bushing arranged in a defined position In order to achieve a high degree of repeatability the extension leads should run tightly along the body of the bushings This is ensured by screw clamps which connect the braids always with ideal length to the base of the bushing Due to their high flexibility the tester can lay the braids tightly to the bushing This clamp and braid arrangement complies with the strict demands of engineers around the globe requiring a ground extension as short as possible and with the smallest achievable loop only the FRAnalyzer provides this in such an exceptional manner OMICRON Your Benefits gt True value results due to accurate reproducibility gt High end clamps for exceptional repeatability gt Minimal noise interference due to the use of two broad ground braids gt Time saving because of cutting functionality of screw type clamps Fast Easy and Efficient Software The FRAnalyzer software is specially designed to fit the needs of the on site testing personnel as well as the requirements of the engineers analyzing the data The tests are easy to establish and fast to perform The software suggests useful test sequences according to transformer type and vector group An implemented
11. sformer check after short circuit testing Integrity verification of transformers after transport Condition assessment after the occurrence of high transient fault currents Routine diagnostic measurement Diagnosis after transformer alarm or protection tripping gt Testing after significant changes of monitored values e g combustible gases gt Further inspection after the observation of unusual routine test results gt Scientific investigations SWEEP FREQUENCY RES Sine generator Transformer variable frequency complex RLCM network The FRAnalyzer injects a sinusoidal excitation voltage with a continuously increasing frequency into one end of the transformer winding and measures the signal returning trom the other end The comparison of input and output signals generates a unique frequency response OMICRON Why OMICRON FRAnalyzer gt Use of the SFRA principle the industry standard for measurements in frequency domain gt Extremely small size and weight using leading edge technology for easy handling Highest convenience resulting trom battery operation gt Best repeatability due to an innovative connection technique based on the latest scientific findings PONSE ANALYSIS SFRA gt Easy to use creative software with implemented standard based assessment solution gt World class OMICRON customer support and valuable trace assessment help by technology experts gt Free access to the
12. ually called a fingerprint Geometrical changes within and between the elements of the network cause deviations of its frequency response Differences between an SFRA fingerprint and the result of an actual measurement are an Indication of positional or electrical variations of the internal components Different failures are directly related to different sections of the frequency range and can usually be discerned from each other KELNEK IALTA TTI WHA OMICRON The core and winding assembly of power transformers can be seen as a complex electrical network of capacitances inductances and resistors Your Benefits gt High reliability of test results due to the applied measurement method and high repeatability of test results due to sophisticated connection technique SFRA can detect winding and core problems which remain hidden using any other diagnostic method Valuable and cost effective tool for deciding whether a transformer can be powered up again after protection tripping or not Informative failure analysis helps avoid expensive defueling of transformer s active part Unigue Connection Technique The OMICRON FRAnalyzer uses an innovative connection technique to enable exceptional repeatability of the test results Exceptional Repeatability with Advanced Connection Technique Since SFRA is a comparative method it is of vital importance that measurements on the same object under the same conditi
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