Furan analysis of transformer oil free download as pdf file. Furan analysis allows to determine the condition of the paper insulation, which reflects the condition of the transformer. Residual magnetism will remain in the core and ruin the excitation current test results. Transformer condition index arrived at be scrutinized by engineering experts. Residual life assessment with dga, furan content in transformer oil. When the cellulosic insulation materials within a transformer undergo degradation some of the products formed are derivatives of the aromatic compound called furan. Doble offers routine and emergency testing as well as development of routine or comprehensive testing programs. I just received an oil analysis result for a transformer. Jun 18, 2019 furan analysis is very sensitive, as damage to a few grams of paper is noticeable in the transformer oil even in a large transformer.
Complete tests 1 and 2 for each winding of a threephase transformer individually with the remaining windings kept open. Doble diagnostic test equipment doble engineering company. Doble laboratory services doble engineering company. As power transformer is highly expensive as well as important part of distribution system. This article attempts to capture and summarize the known technical information and recommendations for analysis of furan test results. Previous literatures had also depended on furan test analysis in order to determine the remaining lifetime of operating transformers 29, 40 42. Oil furan level standards test astm d5837 electric. Furan analysis is very sensitive, as damage to a few grams of paper is noticeable in the transformer oil even in a large transformer. Syed islam, for guidance and encouragement throughout the duration of the project. It is a very significant diagnostic test, and bisgenerally considered the best test for assessing the life of a transformer. Accuracy of furan analysis in estimating the degree of polymerization in power transformers nkosenye sidwell mtetwa a research report submitted to the faculty of engineering and the built environment, university of the witwatersrand, in partial fulfillment of the requirements for the degree of master of science in engineering. A fast method for the analysis of 4 furanic compounds in transformer oil in 5. Furan test is used to determine the life of a transformer and condition of transformer oil in transformer oil.
By the furan analysis, we check the condition of paper in transformer oil. The dp test provides an estimate of the average polymer size of the cellulose molecules in materials such as paper and pressboard. In feb 2008, when the test was carried, the furan content had increased to 8530 ppb. The power transformer also forms a significant percentage of the total investment in the. Furan derivatives test, which uses software application once the oil is eligible for furan test. The software gives the corresponding reading about the present. Furan analysis of transformer oil transformer phases of matter. Furan testing helps determine paper insulation degradation of transformer oil by. By measuring the quantity and types of furans present in a transformer oil sample, the paper insulation overall dp can be. Transformer tests eep electrical engineering portal.
Pdf furan analysis for liquid power transformers researchgate. Ms excel spreadsheet electrical engineering portal. Analysis of furanic compounds in transformer oil by. Furan prediction in transformer oil using artificial neural network g. Analysis using various approaches for residual life estimation of. It should be pointed out that it is difficult to derive an exact dp value correlation from the furan content. The report included the level of furan, according to the test astm d5837. Predication of life of transformer insulation by developing relationship between degree of. Samples are easily shipped to intertek laboratories providing transformer oil analysis, on a global basis. Doble engineering company supports our clients in the electric power industry improve operations and optimize system performance. Assessing remnant life of transformer based on furan. Furan indicates the compounds of carbon and hydrogen.
Arun sankar department of eee national engineering college kovilpatti, tamilnadu, india. Gerald sellers lab manager shermco oil analysis laboratory. Furan analysis can be useful in determining the amount of life expended. Transformer based on furan content in transformer oil and by sanjay.
This test is similar to tests 1 and 2, but as applied to a three phase transformer for phase identification and phase continuity check. This study used power transformer test data consisting of dielectric. Evaluation of an efficiencent transformer core design poonam lutchman a dissertation submitted to the faculty of engineering and the built environment, university of the witwatersrand, in fulfilment of the requirements of the degree of master of science in engineering. Furan measurement in transformer oil by uvvis spectroscopy using fuzzy logic approach front matter ii acknowledgement the author would like to express his sincere thanks to his supervisor, prof. They are the vital links between generation and transmission. The three methods are conventional oil test, furan derivatives test and markov. Australasian universities power engineering conference, aupec 20, hobart, tas, australia, 29 september 3 october 20 1 abstract this paper the investigatesimpact of conducting materials on the correlation of furan concentration in transformer oil and its spectral response s. Five furans are involved in testing including 2 furfurol 2fol, 2furaldehyde 2fal and 2acetylfuran 2acf. Oil filled transformers in these all tests were conducted according to the different service for. Pdf residual life assessment with dga, furan content in. It can cause non availability of transformers for long hours. Furans concentration is a very important aging indicator for the.
School of electrical engineering and informatics, institut teknologi. By monitoring the ration on co and co2 found dissolved in the. Check relay schemes, evaluate insulation condition and assess risk across your transformer fleet with doble diagnostic test equipment and software. By measuring the quantity and types of furans present in a transformer oil sample, the paper insulation overall dp degree of polymerisation can be inferred with a high degree of confidence. Dissolved gas analysis dga test of transformer oil. Transformer maintenance testing of transformers zttr test transformer turns ratio test 3 phase ttr set single phase ttr set readings should not deviate more than. Transformer 6 1 capacity 20 mva 2 voltage class 266 kv 3 make ngef 4 yom 1973 5 cooling onanonaf 6 oil type naptha 7 age 43 tests for oil properties, dga, furan were conducted according to the standards mentioned in table 1. The methods used during tests and measurements of the power transformers, test and measurement circuits, calculations and evaluation criterias are included in this manual. What is the importance of furan analysis on transformer oil. Furan testing helps determine paper insulation degradation of transformer oil. Furan measurement in transformer oil by uvvis spectrocospy. Further, correlations between the furan 2fal concentration in the oil and the average dp of the investigated german gsu transformers and grid transformers. Do not attempt to run an excitation test on a transformer immediately after using dc test equipment.
Insulating oil and transformer oil testing labs are located in the united kingdom, united arab emirates, singapore, africa, mexico, spain, and other locations. Prior to furan analysis, dissolved gas analysis in oil was the only noninvasive test performed on transformers that could indicate internal problems. These properties are used to evaluate the end of reliable life of paper insulation. The furan content in the transformer oil had reached 12739 ppb by april 2008.
The c auses of paper decomposition in transformers include. The dga test analyzes the gas concentrations that are. The type and routine test are very important for transformer. Predication of life of transformer insulation by developing. Power transformer insulation assessment based on oil. Transformer oil analysis includes several types of transformer fluid tests, such as dissolved gas analysis and screen tests. Oil sample collected for dga test after failure has indicated electrical discharges of high energy. Powerfactor or dissipationfactor tipup exceeding 1. A dga test can identify an overloaded transformer by a test result showing high carbon monoxide, high carbon dioxide, and in extreme cases even elevated methane and ethylene. Oil furan level standards test astm d5837 electric power. Similarly furan analysis was done and dissolved gas analysis. Nonthermally upgraded paper emits approximately 3 times more.
Abstract transformers are one of the most critical and essential. Insulation resistance test of transformer is one of the most important transformer tests we can perform this test at factory or site this test can be classified under type test, routine test, precommissioning and commissioning tests, periodic maintenance transformer tests you can know more about transformer testing and its. Screen testing evaluates the physical, electrical and chemical attributes of the transformer oil. It will also provide the technical basis for continued gathering and evaluation of furan data for liquid power transformers, and provide a recommended structure for collecting that data. Mlgw began to test each of its transformers for furans in 2009. This paper deals with three types of power transformer failure analysis tests which can help in monitoring the transformer condition. A degree of polymerization was observed in a 40yearold transformer of mlgw following a test. Gray transformer chemistry services direct evaluation the mechanical properties of insulating paper can be established by direct measurement of its tensile strength or degree of polymerization dp. Dissolved gasinoil analysis, dga one important part of diagnostic testing is the dissolved gas analysis dga. Furan prediction in transformer oil using artificial.
Transmission power transformer assessment using furan. March 2017, page 1 doble engineering company, 85 walnut street, watertown, ma 02472 usa transformer oil purchase specifications. When the furan count is above 2500ppb, it means the transformer is about to fail. Furan test reports of transformers 2 based on all the test reports of oil properties, dga, furan tests, following conclusions can be drawn in transformer 1, oil reports show low interfacial tension which indicates presence of polar contaminants and may also indicate poor compatibility of oil with various materials used in transformer. The degree of polymerization dp test is another means for assessing insulation aging. Aging assessment of power transformer using multiparameters. Furan measurement in transformer oil by uvvis spectroscopy using fuzzy logic approach front matter iii list of publications it is acknowledge that part of the thesis has already been published in some of the conferences. Furan prediction in transformer oil using artificial neural. The average transformer age is approximately 40 years old. The labs test insulation oil samples from clients across the world. I was able to find several references for the standard values from the ieee and other sources for the dissolved gases for each gas and for the several ratios, physical properties of the oil, water content, etc, but i just cant find anything about the furans. The three methods are conventional oil test, furan derivatives test.
Best in class data the key to successful transformer maintenance is powerful analytical testing procedures. Dissolved gas analysis by dga, we can test and predict the gases evolved and dissolved in gases, with that we can analyse the particular fault in transformer, where as in furan analysis we can test, which compounds are formed in oil and corresponding fault is predicted. Postmortem investigation of power transformers profile of. Furan content of the transformer was monitored since then. Mlgws transformer department performs many diagnostic transformer tests. In the past, dissolved gas analysis has been the best predictive, noninvasive test for potential failures.
A 40yearold transformer showed a degree of polymerization of 260 in early 2010 during testing, with estimated remaining life at 19 percent. The above standard testing is offered in specific diagnostic suites designed to provide the maximum condition information on the transformers. Oil testing capabilities doble engineering company. Furan testing is another test done on transformer oil to determine if the paper insulation is degraded. International journal on electrical engineering and informatics volume 11. Sakthivel high voltage engineering national engineering college kovilpatti, tamilnadu, india. If you continue browsing the site, you agree to the use of cookies on this website. Furan analysis on transformer oil indicates the degree of degradation of the transformer paper insulation. Causes of paper decomposition in transformers include. Over the past five decades we have generated millions of test results from thousands of highvoltage units, and we process samples from transformer owners across the country. This volume provides timely, practical advice to those seeking to better understand how transformers work, how they are best maintained, and how to test and evaluate their condition.
Associate professor, electrical engineering department, guru nanak dev engineering college. For typical power transformer, with an oil to paper ratio of 20. Transformer paper expected life estimation using anfis. You can even try to stump your fellow engineers by posting an engineering puzzle. To study the effect of oil reconditioning and oil replacement on the furan values. This is usually done in transformers aging above 15 years. Furan testing helps determine paper insulation degradation. By measuring the quantity and types of furans present in a transformer oil sample, the paper insulation overall dp can be inferred with a high degree of confidence. This test helps reveal the quality and integrity of the insulating liquid and can be used to determine when a filtering or change of transformer liquid is needed. Impact of conducting materials on furan spectral correlation.
Oil diagnostic suites for transformer oil diagnostics. Early detection of paper insulation breakdown can prevent major damage or failure to the power transformer. Analisa furan test di minyak trafo sains, teknologi dan. Insulation paper terbuat dari bubur kayu yang diproses dengan tambahan naoh sodium hydroxide dan na 2 so 3 sodium sulphite sehingga terbentuk seratserat organik atau lebih dikenal dengan selulosa cellulose atau glukosa nabati.
To determine of the life of transformer and the condition of insulating component furan test conduct. Transformer oil purchase specification test limits type of test notes astm method type i uninhibited inhibited. Good linearity was observed from 50 ppb to 9000 ppb with a linear correlation of 0. Massachusetts, indiana, north carolina, texas, and our morgan schaffer laboratory in montreal, canada. Recently, mlgw has added furan analysis to its diagnostic tests. Basics, maintenance, and diagnostics vii contents continued page 4.
The standard test suites are designed for individual samples to deliver a routine set of oil analysis at low cost. Evaluation of transformer solid insulation transformer chemistry. Generally, paper in new transformers has a dp of about. Transformer oil is tested for its gas composition and the ratio of appropriate dissolved gasses is considered and thus the distribution transformer condition can be analyzed. The furan test is a strong indicator of transformer paper insulation ageing.
Application of machine learning in transformer health. Assessing remnant life of transformer based on furan content. Analisa bdv test di minyak trafo terdapat hubungan antara insulation paper dengan uji furan di minyak trafo seperti berikut. The types and concentration of furans in an oil sample. Analysis of furanic compounds in transformer oil by agilent. The dissolved gas analysis can give an early indication of abnormal conditions inside the transformer.
The power factor of overheated or contaminated insulating fluid will increase and can give the based for additional investigation. Based on all the test reports of oil properties, dga, furan tests, following. School of electrical engineering and informatics, institut teknologi bandung, bandung. Transmission power transformer assessment using furan measurement with the aid of thermal model dongyin feng and zhongdong wang school of electrical and electronic engineering the university of manchester, m 9pl, uk email. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Furan is a chemical compound that dissolves in the insulation oil upon the breakdown of the cellulose chain of the paper material 10.
The test connection arrangement is shown in figure 2 c. Furan testing helps determine paper insulation degradation of. The transformer was immediately taken offline and internally inspected to identify any problems. Pdf a tool for estimating remaining life time of a power. End of useful life of a power transformer is determined by the remaining. As it checks the quality of material used and the procedure of transformer manufacturing hence provide us details of life of transformer, the transformer behaviour on different faults. Construction of transformer definition of transformer. Furan analysis when a cellulose molecule depolymerises breaks into smaller lengths or ring structures, a chemical compound known as a furan is formed. Analysis using various approaches for residual life. It is only an adjuvant measurement and only the sum of different procedures dga, humidity in oil and aging assessment of power transformer using multi. The degradation materials produce co and co2 gases. Furans are part of the products generated as paper decomposes. Study of furanic compounds in transformer oil study conclusions the main objective of establishing a data bank for various age groups of transformers has been met and the analysis of results detailed in chapter 7. Furan is a heterocyclic aromatic system consisting of four carbons and one oxygen in a five membered ring with each of the carbons having hydrogen attached.
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