scholarly journals Understanding ethanol versus methanol formation from insulating paper in power transformers

Cellulose ◽  
2015 ◽  
Vol 22 (5) ◽  
pp. 3225-3236 ◽  
Author(s):  
E. M. Rodriguez-Celis ◽  
S. Duchesne ◽  
J. Jalbert ◽  
M. Ryadi
Keyword(s):  
Power Transformers ◽  
Insulating Paper ◽  
Methanol Formation

scholarly journals Characterization of insulation papers using FTIR-ATR spectroscopy

2021 ◽  
Vol 31 (31) ◽  
pp. 125-136
Author(s):  
Jelena Planojević ◽  
J. Lukić ◽  
Valentina Vasović ◽  
D. Mihajlović ◽  
Jelena Janković ◽  
...  
Keyword(s):  
Power Transformers ◽  
Characteristic Functional ◽  
Cellulose Modification ◽  
Insulating Paper ◽  
Significant Difference ◽  
The Difference ◽  
Atr Spectroscopy ◽  
Amine Compounds ◽  
Thermal And Chemical Stability

The need to increase the productivity and capacity of power transformers has conditioned the production of insulating papers of a higher thermal class. For this purpose, various techniques of solid insulation modification were applied, which enable the increase in thermal and chemical stability of the insulating paper during the operation of the transformer. The applied additives, primarily dicyandiamide (DICY) and polyacrylamide (PAM), are one form of cellulose modification in the final stages of paper production. A significant difference between the papers is the nitrogen content in the paper, which is characterized by the addition of amine compounds (additives). The paper presents the application of infrared spectroscopy with totally attenuated reflection (FTIR-ATR) in the characterization of paper samples. The aim is to observe the difference between regularly kraft and thermally upgraded paper reflected in the presence or absence of characteristic functional groups for additives. The strip identification at 2194-2154 cm-1 confirmed the presence of dicyandiamide additives (DICY) in the spectrum of the sample of thermally upgraded paper, which is different compared with the spectrum of regular kraft paper.

scholarly journals Frequency Domain Diagnostics of Transformer Insulation

2019 ◽  
Vol 10 (4) ◽  
pp. 353-359
Author(s):  
M. Gutten ◽  
M. Šebok ◽  
D. Korenčiak ◽  
P. Brnčal ◽  
M. Kubiš ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Chromatographic Analysis ◽  
Single Phase ◽  
Power Transformer ◽  
Operating Temperature ◽  
Power Transformers ◽  
Insulating Paper ◽  
Recovery Voltage ◽  
Transformer Insulation ◽  
Diagnostic Measurement

The first part of paper deals with the base information about diagnostics of power transformers. In this part are presented differently insulating methods, for example method of recovery voltage method, method of polarization and depolarization currents and chromatographic analysis.The second part of paper deals use of method of frequency domain spectroscopy for oil power transformers. This method is used in analysis insulating condition of power transformer with system of oil-paper. It was found, that the results of these tests are highly impacted by the operating temperature during the experimental measurement. Moisture and conductivity between insulating paper and oil in an insulating system are highly dependent from temperature.In the other part, the paper presents experimental results of the frequency diagnostic measurement for a real single-phase traction transformer 110/27 kV at different operating temperatures and states (with oil and without).Finally in the last part, the paper presents comparing frequency insulating measurements among several the same single-phase transformers 110/27 kV.

scholarly journals Deterioration Diagnosis of Insulating Paper for Power Transformers by Optical Analysis

2000 ◽  
Vol 120 (6) ◽  
pp. 873-878 ◽  
Author(s):  
Jun'ichi Katagiri ◽  
Yoshitaka Takezawa ◽  
Yuzo Itoh ◽  
Hiroshi Matsubara ◽  
Toshiki Yura ◽  
...  
Keyword(s):  
Power Transformers ◽  
Optical Analysis ◽  
Insulating Paper

Measuring and understanding the ageing of kraft insulating paper in power transformers

1996 ◽  
Vol 12 (3) ◽  
pp. 28-34 ◽  
Author(s):  
M. Ali ◽  
C. Eley ◽  
A.M. Emsley ◽  
R. Heywood ◽  
X. Xaio
Keyword(s):  
Power Transformers ◽  
Insulating Paper

scholarly journals The Degree of Polymerization in a Prediction Model of Insulating Paper and the Remaining Life of Power Transformers

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 670
Author(s):  
Sherif S. M. Ghoneim
Keyword(s):  
Mathematical Model ◽  
Degree Of Polymerization ◽  
Power Transformers ◽  
Remaining Life ◽  
Dissolved Gases ◽  
Statistical Tools ◽  
Insulating Paper ◽  
Tan Δ ◽  
Insulation Status ◽  
Oil Color

The aging of power transformers causes several defects and damages in the insulating system, especially in the insulating paper. The degradation of the insulating paper generates dissolved gases in the insulating oil, which are measured by gas chromatography and used as an indicator of the insulation status. The state of the insulating paper can be identified based on the degree of polymerization (DP) measurement. In some cases, when the measurement of DP is difficult, estimating DP can be accomplished through gathering information about some of the testing parameters, such as the dissolved gases (DGA), breakdown voltage (BDV), oil interfacial tension (IF), oil acidity (ACI), moisture content (MC), oil color (OC), dielectric loss (Tan δ), and furans concentration specifically (2-furfuraldhyde (FA)). The statistical tools (correlation and multiple linear regression), based on 131 transformer samples, can be used to build a relation linking DP and one or more of the previous parameters to identify the insulating paper status and the percentage of remaining life of the transformer. The results indicated that it is difficult to build a mathematical model to relate between the DP and the testing variables, except with FA, where the trend of DP with FA is more obvious than with other variables. The empirical formula to compute DP based on the FA concentration was developed and gave promising results to compute DP and the remaining life of the power transformers.

Sign in / Sign up

Export Citation Format

Share Document