transformer degree of polymerization

Predication of Life of Transformer insulation by .

Predication of Life of Transformer insulation by developing Relationship between Degree of Polymerization and 2- Furfural Dipak Mehta, Prof. Hitesh Jariwala Abstract — Degradation of cellulosic materials can be identified by measuring dissolved carbon oxide gas content in oil, Degree Polymerization (DP) of paper and 2-Furfurol content in oil.

Transformer Diagnostics and Condition Assesment - TestGuy

Jun 23, 2017· 10. Degree of Polymerization. One of the most dependable means of determining paper deterioration and remaining life is the DP test of the cellulose. Do not open a transformer for the sole purpose of doing this test. Perform this test only if the unit is being opened for other reasons.

transformer degree of polymerization,

Evaluation of Transformer Solid Insulation - satcs.za

The "predicted" DP (degree of polymerisation) indicates an average paper condition over the whole transformer (subject to factors such as effective circulation). New Kraft paper has a DP in excess of 1200, and paper with a DP of 200 or less is considered to be unfit (subject to interpretation).

NTT - DEGREE OF POLYMERIZATION

DEGREE OF POLYMERIZATION OF CELLULOSE Background: Cellulose is used throughout transformers in the form of insulating papers and boards. Cellulose is a polymeric material of cellobiose, -[C 12 H 14 O 4 (OH) 6] n -, where n is in the range of 300 to 700 units.

Degree of polymerization - Wikipedia

Degree of polymerization. For example, in nylon-6,6, the repeat unit contains the two monomeric units —NH (CH 2) 6 NH— and —OC (CH 2) 4 CO—, so that a chain of 1000 monomeric units corresponds to 500 repeat units. The degree of polymerization or chain length is then 1000 by the first (IUPAC) definition, but 500 by the second.

Applications of ANFIS to Estimate the Degree of .

degree of polymerization from furan data of each investigated transformer is analyzed using the corresponding oil insulation characteristics and DGA data. Results show that carbon oxides compounds, acidity number, interfacial tension, and colour of the oil are statistically correlated with the degree of polymerization of the insulation paper.

Transformer Overloading and Assessment of Loss-of-Life …

Apr 19, 2011· • The Tensile Strength (Mechanical) of cellulose insulation is used as a criteria for loss-of-life estimation. • Recently, the Degree of Polymerization (DP) (Chemical) has also become a popular measurement of insulation life.

How Transformers Age | Transmission & Distribution World

Transformers are designed with an expected life span of 30 years, though some in Japan have been in service for more than for 50 years. The need to replace transformers can be determined by evaluating individual conditions, but to plan a long-term transformer replacement program, it is necessary to determine the life expectancy of the asset.

Transformer Diagnostics and Condition Assesment - TestGuy

Jun 23, 2017· 10. Degree of Polymerization. One of the most dependable means of determining paper deterioration and remaining life is the DP test of the cellulose. Do not open a transformer for the sole purpose of doing this test. Perform this test only if the unit is being opened for other reasons.

What is furan analysis in transformer oil? - Quora

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. The types and concentration of furans in an oil sample .

Power Transformer Installation | SPX Transformer Solutions .

Using your specifications, the transformer manufacturer's specifications or ours, our Service Team can vacuum degasify and prepare new oil for installation, pull vacuum on the transformer and professionally complete the vacuum oil-filling process.

Predicting Failure: Furan Testing of Transformers .

MLGW began to test each of its transformers for furans in 2009. The results produced a good baseline. A 40-year-old transformer showed a degree of polymerization of 260 in early 2010 during testing, with estimated remaining life at 19 percent. The transformer was immediately taken offline and internally inspected to identify any problems.

Degree of polymerization estimation of insulation papers .

Sep 27, 2012· Degree of polymerization (DP) is thought to be a good index to determined deterioration level of insulation paper in power transformers. In practical condi Degree of polymerization estimation of insulation papers in power transformers based on load and temperature histories in Java-Bali Region of Indonesia National Electric company - IEEE Conference Publication

Applications of ANFIS to Estimate the Degree of .

Degree of Polymerization is a reliable parameter that can identify the health condition and remaining operational life of the paper insulation within power transformers. Measuring this parameter is a challenging process due to the difficulty in acquiring paper samples from hot spot locations of operating transformers.

Transformer Lifetime Prediction - Stanford University

Transformer Lifetime Prediction EE292K : Intelligent Energy Projects Christian Osorio, Nandan Sawant 1. Problem statement The costs of blackouts can be astronomical. The Department of Energy estimates the total cost of the August 2003 blackout of the Northeastern United States and Canada to …

Services - Federal Power Transformers

Repair & Refurbishment of Power Transformers; Oil filling under vacuum at site; Oil Filtration and Testing: DGA, BDV, degree of polymerization, Moisture content; Oil Passivation; Refurbishment of Tap-changers; Spares; Site and commissioning Tests; Life time Assessment and health checks of Transformers; Annual Maintenance Contracts; Uprating of .

Transformer Testing | SPX Transformer Solutions, Inc.

Degree of Polymerization ADDITIONAL SERVICES AVAILABLE: SPX Transformer Solutions possesses the equipment, experience and capabilities to complete other service work you may elect to perform based on your test results, such as insulation dryouts, bushing replacements, LTC repairs/upgrades, natural ester retrofill, etc.; combining services can minimize costs and transformer downtime.

Assessing Remnant Life of Transformer based on Furan .

oil-filled Transformers, more particularly which are in service for more than 15 years, it is advisable that we should also estimate the residual life of the Transformers. It can be done by assessing the extent of degradation of the cellulosic paper insulation through Furan content in Transformer oil and degree of polymerization of paper insulation.

Degree of polymerization of insulation paper in the .

Based on the detected degree of polymerization (DP) value of insulation paper on power transformer, a new formula to describe the relationship between DP and the lifetime of power transformer is .

Degree of Polymerization | Cellulose | Polymers

Degree of Polymerization & Furan Analysis Mohd Taufiq Bin Ishak. Degree of Polymerization (DP). The solid insulation (paper, pressboard, transformer-board) used in transformers is a sheet of material made from vegetable cellulose. The main source of cellulose fibre is wood. In a dry condition, wood contains 40 to 50% cellulose, 20 to 30% lignin and 10 to 30% hemicellulose and polysaccharides.

A GUIDE TO TRANSFORMER OIL ANALYSIS BY I.A.R. GRAY .

Evaluation of Transformer Solid Insulation Direct Evaluation The mechanical properties of insulating paper can be established by direct measurement of its tensile strength or degree of polymerization (DP). These properties are used to evaluate the end of reliable life of paper insulation. It is generally suggested that DP v alues of 150-250

The Research of Connection between Degree of .

Degree of Polymerization, Oil-Paper Insulation, Frequency Domain Dielectric Spectroscopy, Moisture 1. Introduction As the promotion of transmission voltage, oil-immersed power transformers in power systems become more and more important. Oil-paper insulation is an oil immersion major component of the internal insulation of power transformers in

Residual Life assessment with DGA, Furan content in .

from its concentration, degree of polymerization was calculated Although the life of transformer is generally accepted to be 25 to and thus remnant life of the transformers. Chendong's formula 30 years.

Oil testing capabilities - Doble Engineering Company

The water migrates between the solid and liquid insulation in a transformer with changes in temperature. The water content is reported in parts per million and percent of relative saturation. Degree of Polymerization. The degree of polymerization (DP) test is another means for assessing insulation aging. This test is performed on paper samples.

Applications of ANFIS to Estimate the Degree of .

degree of polymerization from furan data of each investigated transformer is analyzed using the corresponding oil insulation characteristics and DGA data. Results show that carbon oxides compounds, acidity number, interfacial tension, and colour of the oil are statistically correlated with the degree of polymerization of the insulation paper.

Transformers with low degree of polymerisation of paper

Presently there is no agreement among transformer experts on this issue. Degree of polymerisation of paper. The extent of paper degradation is represented by the degree of polymerisation or DP of paper. New insulating paper has typically a DP of 1100 and a high tensile strength.

Predication of Life of Transformer insulation by .

Degree of deterioration of cellulosic paper is affected by chemical base of transformer oil. 1) A Relationship between life indicating parameters like Degree of polymerization and 2-furfural content is established. The end point criteria for DP of paper and corresponding furfural content in oil 200 and 10 ppm respectively.

What is furan analysis in transformer oil? - Quora

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. The types and concentration of furans in an oil sample .

Residual Life assessment with DGA, Furan content in .

International Journal of Scientific and Research Publications, Volume 6, Issue 7, July 2016 230 ISSN 2250-3153 Residual Life assessment with DGA, Furan content in transformer oil and Degree of polymerization of solid insulation Inderpreet Kaur, Preetinder Singh Student, M.Tech, Electrical Engineering Department, Guru Nanak Dev Engineering College Ludhiana Associate Professor, …

Applications of ANFIS to Estimate the Degree of .

The Calculated degree of polymerization from furan data of each investigated transformer is analyzed using the corresponding oil insulation characteristics and DGA data. Results show that carbon oxides compounds, acidity number, interfacial tension, and colour of the oil are statistically correlated with the degree of polymerization of the insulation paper.