To determine of the life of transformer and the condition of insulating component furan test conduct. The furan content in the transformer oil had reached 12739 ppb by april 2008. The degradation materials produce co and co2 gases. Analisa furan test di minyak trafo sains, teknologi dan. Do not attempt to run an excitation test on a transformer immediately after using dc test equipment. Vis spectral response and furan measurement of transformer oil, in condition monitoring and diagnosis, 2008. After installation of transformer on the plinth, accessories viz. In feb 2008, when the test was carried, the furan content had increased to 8530 ppb. Hartford steam boiler uses test results in its transformer oil gas analyst toga program, for instance, to. Good linearity was observed from 50 ppb to 9000 ppb with a linear correlation of 0. Analysis of paper insulation for its dp value requires removal of a few strips of paper. Assessing remnant life of transformer based on furan content. Early detection of paper insulation breakdown can prevent major damage or failure to the power transformer.
By measuring the quantity and types of furans present in a transformer oil. Furan is a colorless, flammable, highly volatile liquid with a boiling point close to room temperature. It can cause non availability of transformers for long hours. They are the vital links between generation and transmission. The transformer failed in service while undergoing poweron purification to remove moisture from the insulating oil. The first one is oil sample test, wherein the transformer oil is tested for its gas composition and ratio of appropriate dissolved gases is considered and thus the transformer condition can be analyzed. Powerfactor or dissipationfactor tipup exceeding 1. Oil furan level standards test astm d5837 miketech59 electrical 10 oct 05 09. The parameters and results were compared with a normal working transformer with the same parameters and age. The ttr300 series are ideal for use by power transformer manufacturers. A degree of polymerization was observed in a 40yearold transformer of mlgw following a test.
Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry practice. The following tests are routinely conducted in the field on the transformer. Every transformer owner therefore requires implementation of the best practices available to effectively manage transformer life and in turn get a good return on investment and revenue from the asset, and to minimize costly failures. Furan measurement in transformer oil by uvvis spectroscopy using fuzzy logic approach. Pdf the purpose and scope of this article is to discuss the history and development of furan testing as one of several diagnostic tools to.
Detects most internal faults, some external faults and some operational errors. Dissolved gas analysis where carbon monoxide present indicates problems with solid insulation. The report included the level of furan, according to the test astm d5837. Furan test is used to determine the life of a transformer and condition of transformer oil in transformer oil. Transformer testing type tests and routine tests of. Furan testing helps determine paper insulation degradation of transformer oil. And, of course, the ever important and super sophisticated smell and visual test performed by the experienced service technician on site. Furan analysis by measuring the quantity and types of furans present in a transformer oil sample, the paper insulation overall dp can be inferred. In the past, dissolved gas analysis has been the best predictive, noninvasive test for potential failures. The figure shows clearly that there is strong correlation between the spectral response area and furan concentration in transformer oil samples which validate the previously published results in 15, 16. Dioxins and furans is the abbreviated or short name for a family of toxic substances that all share a similar chemical structure. After the first year, an annual dga test should suffice. A conventional faulty oilimmersed transformer 400 v 10 kv, 100 kva was diagnosed and tested with different methods. Samples are easily shipped to intertek laboratories providing.
Dec 08, 2018 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. 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. Current transformers cts voltage transformers cvts ivts 1. When this degrades furans are given off and retained in the oil.
Oil furan level standards test astm d5837 electric power. Dioxins, in their purest form, look like crystals or a colorless solid. As power transformer is highly expensive as well as important part of distribution system. General and physical tests are suggested twice a year, dissolved gas analysis once a year, and furan testing every 2 years for transformers in operation at least 5 years. With the aid of transformer thermal modeling, the papers dp is estimated and a practical correlation is established between the furan measurements and the papers dp estimates. Most dioxins and furans are not manmade or produced intentionally, but. Pdf furan analysis for liquid power transformers researchgate. I just received an oil analysis result for a transformer. This article attempts to capture and summarize the known technical information and recommendations for analysis of furan test results.
This survey provides the test data and information you need to. 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. What is the normal frequency of transformer oil sampling. The following measures are suggested for such transformers. A fast method for the analysis of 4 furanic compounds in transformer oil in 5. Pdf residual life assessment with dga, furan content in. When the furan count is above 2500ppb, it means the transformer is about to fail. 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. Astm d5837 15 standard test method for furanic compounds. 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. Furan tests power transformers blog expert safety and.
In order to ensure that power transformers provide long and troublefree service, several diagnostic tests are carried out and remedial actions initiated throughout. It has been developed with the assistance of bureau of reclamation engineers. Figure 34 test sample consist of copper strip wrapped with transformer paper. Ttr300 series threephase transformer turns ratio test set. Newly installed transformers should be sampled frequently within the first 12 months i. Evaluation of transformer solid insulation transformer chemistry. Transmission power transformer assessment using furan. Furans are one of several chemical compounds that are.
Testing of power transformers seems like a similar experience. Furan is a heterocyclic organic compound, consisting of a fivemembered aromatic ring with four carbon atoms and one oxygen. Although the principle of operation of power transformers has remained the same for all these years, advancements have been made in transformer insulation. The types and concentration of furans in an oil sample can also indicate abnormal stress in a transformer, whether intense, short duration overheating or. The second one is furan derivatives test, which uses software program once the oil is subjected to furan test. Spare transformer to be arranged and kept ready for vital. Assessing remnant life of transformer based on furan. Mlgws transformer department performs many diagnostic transformer tests. 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. It is carried out as a type test as well as routine test.
Their unique testing procedures and storage capability allows an operator to set up and test difficult threephase transformers with multiple tap changers and bushing cts in a fraction of. 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. Recently, mlgw has added furan analysis to its diagnostic tests. Furfural furan2carbaldehyde dissolved in transformer oil is regarded as an important mark of the thermal and mechanical degradation in oilpaper insulation. Using clrs to detect furfural concentration can overcome many disadvantages of traditional. Transformer winding resistance measurement is carried out to calculate the i 2 r losses and to calculate winding temperature at the end of a temperature rise test. Furan testing of transformers oil linkedin slideshare. Because a test confirms what you know, if you can apply in real life what you have learned in a classroom, under strict, rigorous and controlled conditions. Testing and commissioning of hv power transformers. Furans concentration is a very important aging indicator for the evaluation.
These degradation products are substituted furan derivatives, commonly referred to as furanic compounds or furans. Analysis of furfural dissolved in transformer oil based on. Be in the know about available transformer oils and their quality. Power transformer testing transformers may be tested using ac or dc voltage.
The doble annual oil survey publishes data and analysis of commercially available transformer mineral oils. The types and concentration of furans in an oil sample. This study used power transformer test data consisting of dielectric. There are five types of furans and the trending of these furans and their ratio gives an indication of the state of decomposition of. Furan content of the transformer was monitored since then. To study the effect of oil reconditioning and oil replacement on the furan values. Assessing remnant life of transformer based on furan content in. It is also done at site to ensure healthiness of a transformer that is to check loose connections, broken strands of conductor, high contact resistance in tap changers, high. Scope analysis the 2furtural and related furan compounds during cellulosic insulation in mineral insulating oil samples. The tests may include a group of standard dielectric fluid tests, plus combustible gasinoil tests, furan tests, and power factor tests. Five furans are involved in testing including 2 furfurol 2fol, 2furaldehyde 2fal and 2acetylfuran 2acf.
The type and routine test are very important for transformer. Chemical compounds containing such rings are also referred to as furans. When a cellulose molecule depolymerises breaks into smaller lengths or ring structures, a chemical compound known as a furan is formed. Ac voltage is preferable to dc voltage for transformer testing because ac voltage simulates the internal stress that the transformers face during operating conditions. Furan testing is a way of determining the life of a transformer before this occurs. The experience of dp and furan in remnant life assessment of power transformer conference paper pdf available may 2008 with 1,806 reads how we measure reads. The power transformer also forms a significant percentage of the total investment in the power system. Pdf the experience of dp and furan in remnant life. By the furan analysis, we check the condition of paper in transformer oil. Testing oltc on load tap changer tests for reference signature tests on main protective relays. Lots of data and electrical power engineers love lots of data. Analisa bdv test di minyak trafo terdapat hubungan antara insulation paper dengan uji furan di minyak trafo seperti berikut.
Analysis of furanic compounds in transformer oil by. Issued since 1953, the report compares current data with historical reports to evaluate product consistency. 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. Prior to furan analysis, dissolved gas analysis in oil was the only noninvasive test performed on transformers that could indicate internal problems. Hartford steam boiler uses test results in its transformer oil gas analyst toga program, for instance, to diagnose transformer problems.
Confocal laser raman spectroscopy clrs is an effective means of detecting trace liquid and has been widely applied in many fields. Transformer oil testing is a proven loss prevention technique which should be a part of any condition. According to chris adsett, techenomics general manager, like all preventative maintenance tools regular furan analysis can help prevent major damage or failure of a transformer before it occurs and shows when to rewind or retire a transformer. Kr101231586b1 simple test method for furan in aged. Turnsratio test results should not deviate more than. Oil furan level standards test astm d5837 electric. What is the importance of furan analysis on transformer oil. Furan analysis on transformer oil indicates the degree of degradation of the transformer paper insulation. This is usually done in transformers aging above 15 years. Furans are part of the products generated as paper decomposes. Furan testing is another test done on transformer oil to determine if the paper insulation is degraded. After that an opening of the transformer was performed to approve and to make a visual verification of the. Furfural furan 2carbaldehyde dissolved in transformer oil is regarded as an important mark of the thermal and mechanical degradation in oilpaper insulation. 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.