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. Gerald sellers lab manager shermco oil analysis laboratory. 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. The degree of polymerization dp test is another means for assessing insulation aging. They are the vital links between generation and transmission. School of electrical engineering and informatics, institut teknologi.
Furan analysis on transformer oil indicates the degree of degradation of the transformer paper insulation. The dp test provides an estimate of the average polymer size of the cellulose molecules in materials such as paper and pressboard. Pdf a tool for estimating remaining life time of a power. Mlgw began to test each of its transformers for furans in 2009. International journal on electrical engineering and informatics volume 11. Pdf furan analysis for liquid power transformers researchgate. 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. Residual life assessment with dga, furan content in transformer oil. For typical power transformer, with an oil to paper ratio of 20. If you continue browsing the site, you agree to the use of cookies on this website. 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. Application of machine learning in transformer health. Furan prediction in transformer oil using artificial. Postmortem investigation of power transformers profile of.
Construction of transformer definition of transformer. Doble diagnostic test equipment doble engineering company. A fast method for the analysis of 4 furanic compounds in transformer oil in 5. Analysis using various approaches for residual life estimation of. In the past, dissolved gas analysis has been the best predictive, noninvasive test for potential failures. Arun sankar department of eee national engineering college kovilpatti, tamilnadu, india. Furan indicates the compounds of carbon and hydrogen. Power transformer insulation assessment based on oil. Transformer paper expected life estimation using anfis. Associate professor, electrical engineering department, guru nanak dev engineering college. The labs test insulation oil samples from clients across the world. School of electrical engineering and informatics, institut teknologi bandung, bandung. Powerfactor or dissipationfactor tipup exceeding 1.
Furans are part of the products generated as paper decomposes. Furan analysis allows to determine the condition of the paper insulation, which reflects the condition of the transformer. Furans concentration is a very important aging indicator for the. Mlgws transformer department performs many diagnostic transformer tests.
Furan testing helps determine paper insulation degradation. The test connection arrangement is shown in figure 2 c. Further, correlations between the furan 2fal concentration in the oil and the average dp of the investigated german gsu transformers and grid transformers. Furan derivatives test, which uses software application once the oil is eligible for furan test. Previous literatures had also depended on furan test analysis in order to determine the remaining lifetime of operating transformers 29, 40 42. By the furan analysis, we check the condition of paper in transformer oil. Nonthermally upgraded paper emits approximately 3 times more. The software gives the corresponding reading about the present. Early detection of paper insulation breakdown can prevent major damage or failure to the power transformer. Causes of paper decomposition in transformers include. Oil furan level standards test astm d5837 electric power. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The methods used during tests and measurements of the power transformers, test and measurement circuits, calculations and evaluation criterias are included in this manual.
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. Impact of conducting materials on furan spectral correlation. 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. Assessing remnant life of transformer based on furan content. It should be pointed out that it is difficult to derive an exact dp value correlation from the furan content. Insulating oil and transformer oil testing labs are located in the united kingdom, united arab emirates, singapore, africa, mexico, spain, and other locations. The three methods are conventional oil test, furan derivatives test. Oil diagnostic suites for transformer oil diagnostics. To study the effect of oil reconditioning and oil replacement on the furan values. 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 measurement in transformer oil by uvvis spectrocospy.
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. Furan testing helps determine paper insulation degradation of. Furan analysis when a cellulose molecule depolymerises breaks into smaller lengths or ring structures, a chemical compound known as a furan is formed. To determine of the life of transformer and the condition of insulating component furan test conduct.
The types and concentration of furans in an oil sample. When the furan count is above 2500ppb, it means the transformer is about to fail. Massachusetts, indiana, north carolina, texas, and our morgan schaffer laboratory in montreal, canada. 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. Best in class data the key to successful transformer maintenance is powerful analytical testing procedures. You can even try to stump your fellow engineers by posting an engineering puzzle. The three methods are conventional oil test, furan derivatives test and markov. 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. Recently, mlgw has added furan analysis to its diagnostic tests. Five furans are involved in testing including 2 furfurol 2fol, 2furaldehyde 2fal and 2acetylfuran 2acf. The power factor of overheated or contaminated insulating fluid will increase and can give the based for additional investigation.
Furan prediction in transformer oil using artificial neural. Screen testing evaluates the physical, electrical and chemical attributes of the transformer oil. 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. The furan test is a strong indicator of transformer paper insulation ageing. Transformer oil analysis includes several types of transformer fluid tests, such as dissolved gas analysis and screen tests. A 40yearold transformer showed a degree of polymerization of 260 in early 2010 during testing, with estimated remaining life at 19 percent. 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. When the cellulosic insulation materials within a transformer undergo degradation some of the products formed are derivatives of the aromatic compound called furan.
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 type and routine test are very important for transformer. 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. Analisa bdv test di minyak trafo terdapat hubungan antara insulation paper dengan uji furan di minyak trafo seperti berikut. Syed islam, for guidance and encouragement throughout the duration of the project. The standard test suites are designed for individual samples to deliver a routine set of oil analysis at low cost.
Furan testing helps determine paper insulation degradation of transformer oil. Check relay schemes, evaluate insulation condition and assess risk across your transformer fleet with doble diagnostic test equipment and software. The degradation materials produce co and co2 gases. This article attempts to capture and summarize the known technical information and recommendations for analysis of furan test results. Samples are easily shipped to intertek laboratories providing transformer oil analysis, on a global basis.
It can cause non availability of transformers for long hours. Analysis of furanic compounds in transformer oil by. Analysis using various approaches for residual life. The c auses of paper decomposition in transformers include. Aging assessment of power transformer using multiparameters. Based on all the test reports of oil properties, dga, furan tests, following. End of useful life of a power transformer is determined by the remaining. This paper deals with three types of power transformer failure analysis tests which can help in monitoring the transformer condition. Generally, paper in new transformers has a dp of about. A degree of polymerization was observed in a 40yearold transformer of mlgw following a test.
Predication of life of transformer insulation by developing relationship between degree of. 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 is a chemical compound that dissolves in the insulation oil upon the breakdown of the cellulose chain of the paper material 10. Furan analysis of transformer oil free download as pdf file. 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. Analysis of furanic compounds in transformer oil by agilent. The above standard testing is offered in specific diagnostic suites designed to provide the maximum condition information on the transformers. Oil filled transformers in these all tests were conducted according to the different service for. Analisa furan test di minyak trafo sains, teknologi dan.
Pdf residual life assessment with dga, furan content in. Furan analysis can be useful in determining the amount of life expended. The dissolved gas analysis can give an early indication of abnormal conditions inside the transformer. Complete tests 1 and 2 for each winding of a threephase transformer individually with the remaining windings kept open. What is the importance of furan analysis on transformer oil. Basics, maintenance, and diagnostics vii contents continued page 4. March 2017, page 1 doble engineering company, 85 walnut street, watertown, ma 02472 usa transformer oil purchase specifications. By measuring the quantity and types of furans present in a transformer oil sample, the paper insulation overall dp can be. Transformer oil purchase specification test limits type of test notes astm method type i uninhibited inhibited. Do not attempt to run an excitation test on a transformer immediately after using dc test equipment. Furan analysis is very sensitive, as damage to a few grams of paper is noticeable in the transformer oil even in a large transformer. Predication of life of transformer insulation by developing.
The transformer was immediately taken offline and internally inspected to identify any problems. 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. This is usually done in transformers aging above 15 years. The power transformer also forms a significant percentage of the total investment in the. Sakthivel high voltage engineering national engineering college kovilpatti, tamilnadu, india. 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. Furan prediction in transformer oil using artificial neural network g. 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. I just received an oil analysis result for a transformer. As power transformer is highly expensive as well as important part of distribution system. Transformer tests eep electrical engineering portal.
Oil testing capabilities doble engineering company. The average transformer age is approximately 40 years old. Transmission power transformer assessment using furan. Furan testing is another test done on transformer oil to determine if the paper insulation is degraded. Oil sample collected for dga test after failure has indicated electrical discharges of high energy. 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. Residual magnetism will remain in the core and ruin the excitation current test results. The dga test analyzes the gas concentrations that are. Assessing remnant life of transformer based on furan. Transformer condition index arrived at be scrutinized by engineering experts. It is a very significant diagnostic test, and bisgenerally considered the best test for assessing the life of a transformer. The report included the level of furan, according to the test astm d5837. Furan analysis of transformer oil transformer phases of matter. Furan content of the transformer was monitored since then.
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. 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. Abstract transformers are one of the most critical and essential. Transformer based on furan content in transformer oil and by sanjay. Dissolved gasinoil analysis, dga one important part of diagnostic testing is the dissolved gas analysis dga.
This study used power transformer test data consisting of dielectric. Evaluation of transformer solid insulation transformer chemistry. 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. These properties are used to evaluate the end of reliable life of paper insulation.
By monitoring the ration on co and co2 found dissolved in the. Furan test is used to determine the life of a transformer and condition of transformer oil in transformer oil. 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. Doble laboratory services doble engineering company.
Prior to furan analysis, dissolved gas analysis in oil was the only noninvasive test performed on transformers that could indicate internal problems. Good linearity was observed from 50 ppb to 9000 ppb with a linear correlation of 0. 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. In feb 2008, when the test was carried, the furan content had increased to 8530 ppb. Oil furan level standards test astm d5837 electric. Ms excel spreadsheet electrical engineering portal. Furan testing helps determine paper insulation degradation of transformer oil by.
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