Degree of Polymerization Mapping Raman FeatureExtraction of Oil-Paper Insulation Aging Based onQuadratic Mutual Information

2021 ◽  
Author(s):  
Jian Fang ◽  
Weigen Chen ◽  
Dingkun Yang ◽  
Zhuang Yang ◽  
Ruimin Song
Keyword(s):  
Mutual Information ◽  
Degree Of Polymerization ◽  
Insulation Aging ◽  
Paper Insulation

Research of Insulation Aging of Transformer Insulation Paper by Multi-Parameter Regression Analysis

2011 ◽  
Vol 233-235 ◽  
pp. 1345-1348
Author(s):  
Dao Wu Yang ◽  
Hui Hui Han ◽  
Su Wang ◽  
Hai Xia Tong ◽  
Zhuo Ren
Keyword(s):  
Regression Analysis ◽  
Water Content ◽  
Aging Process ◽  
Linear Regression Analysis ◽  
Functional Relation ◽  
Multiple Linear Regression Analysis ◽  
Degree Of Polymerization ◽  
Insulation Aging ◽  
Service Period ◽  
Transformer Insulation

In this paper two types of oil-paper samples are thermally aged in two temperatures of 120. The samples are constituted by 25# oil, 45# oil and paper. Some aging indicators are measured during the aging process. Three parameters are measured during the aging process. The insulating ability of paper can be evaluated by water content and CO2/CO value. The model of functional relation for degree of polymerization (DP) with CO2/CO value, water content and service period are established by multiple linear regression analysis.

Reduction Mechanism of Alcohols Contents Caused by Acids During Oil-Paper Insulation Aging

2021 ◽  
Vol 28 (6) ◽  
pp. 1867-1874
Author(s):  
Enze Zhang ◽  
Jiefeng Liu ◽  
Xianhao Fan ◽  
Yiyi Zhang ◽  
Chaohai Zhang
Keyword(s):  
Reduction Mechanism ◽  
Insulation Aging ◽  
Paper Insulation

scholarly journals Optimization of Transformer Winding Deformation Assessment Criterion Considering Insulation Aging and Moisture Content

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6491
Author(s):  
Qian Wu ◽  
Yizhuo Hu ◽  
Ming Dong ◽  
Bo Song ◽  
Changjie Xia ◽  
...  
Keyword(s):  
Moisture Content ◽  
Frequency Response ◽  
High Sensitivity ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Response Curves ◽  
Insulation Aging ◽  
Transformer Winding ◽  
Winding Deformation ◽  
Paper Insulation

Frequency response analysis is widely used to diagnose transformer winding deformation faults due to its high sensitivity, strong anti-interference capability, and equipment portability, but the results of frequency response analysis can be affected by insulation aging and moisture in the transformer, leading to errors in the diagnosis of winding deformation faults. Currently, there is no effective method to prevent such errors. This paper focuses on optimizing the criterion for diagnosing winding deformations when insulation aging and moisture are present. First, the winding frequency response curves of oil-paper insulation were determined by combining insulation aging and moisture tests of the oil-paper insulation with frequency response simulations of the transformer winding. Next, the winding deformation criterion predicting the likelihood and extent of errors diagnosing transformer winding deformations due to the insulation aging and moisture content is discussed. Finally, the corresponding criterion optimization method is proposed. The corresponding results show that insulation aging and moisture can lead to errors when using the correlation coefficient R criterion to diagnose the transformer winding deformations. Moreover, the possibility of winding deformation errors caused by the change of insulation state can be reduced by introducing the corresponding auxiliary criterion through comparing the capacitance change rate based on the frequency response method and that based on the dielectric spectrum method.

scholarly journals THE DEGREE OF POLYMERIZATION OF POWER TRANSFORMERS’ PAPER INSULATION

2019 ◽  
Vol 20 (9-10) ◽  
pp. 34-38 ◽  
Author(s):  
V. K. Kozlov ◽  
A. Kh. Sabitov
Keyword(s):  
Aging Time ◽  
Thermal Aging ◽  
Manufacturing Process ◽  
Degree Of Polymerization ◽  
Power Transformers ◽  
Aging Rate ◽  
Slowing Down ◽  
Starting Time ◽  
Exponential Decrease ◽  
Paper Insulation

The paper presents the results of research and analysis of literature data on the paper insulation's thermal aging. An exponential decrease in the degree of polymerization of paper insulation from the aging time is established, at the starting time of transformers’ operation the aging rate of paper insulation is maximal and after that its slowing down. It was found out that the degree of polymerization at the starting time of the transformer's operation can be in the range of 900 units, this is due to its drying during the manufacturing process.

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