Calculation and analysis of hot-spot temperature-rise of transformer structure parts based on magnetic-thermal coupling method

2013 ◽  
Author(s):  
Yan Li ◽  
Longnv Li ◽  
Yongteng Jing ◽  
Shuangpeng Li ◽  
Fengge Zhang
Keyword(s):  
Temperature Rise ◽  
Hot Spot ◽  
Coupling Method ◽  
Thermal Coupling ◽  
Spot Temperature

scholarly journals Study on the Method of Calculating Temperature Rise of Transformer

2020 ◽  
Vol 179 ◽  
pp. 01027
Author(s):  
Tao Li ◽  
Xiaoping Du ◽  
Xuewu Sun ◽  
Yuanyuan Song
Keyword(s):  
Temperature Rise ◽  
Thermal State ◽  
Hot Spot ◽  
Scientific Basis ◽  
Internal Temperature ◽  
Insulation Aging ◽  
The Neural Network ◽  
Forecasting Method ◽  
Transformer Winding ◽  
Spot Temperature

The internal temperature of the transformer is a key parameter to measure the thermal state of the transformer. The service life of the transformer generally depends on the life of the insulating material, and high temperature is the main reason why cause insulation aging, this paper studies the temperature rise of transformer winding hot spot temperature for the key, using the neural network forecasting method, forecasts transformer winding hot spot temperature change rule, calculate the transformer internal temperature rise, provide the temperature of the scientific basis for the safe operation of the transformer.

A Novel Approach to Investigate the Hot-Spot Temperature Rise in Power Transformers

2015 ◽  
Vol 51 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Longnv Li ◽  
Shuangxia Niu ◽  
S. L. Ho ◽  
W. N. Fu ◽  
Yan Li
Keyword(s):  
Temperature Rise ◽  
Hot Spot ◽  
Power Transformers ◽  
Novel Approach ◽  
Spot Temperature

Paper 12: Determination of the ‘Hot Spot’ Temperature Rise from P.V.C. Insulation Characteristics

1969 ◽  
Vol 184 (11) ◽  
pp. 117-130
Author(s):  
S. W. Twaites ◽  
R. F. Murray
Keyword(s):  
High Temperature ◽  
Temperature Rise ◽  
Hot Spot ◽  
Electrical Machines ◽  
Maximum Temperature ◽  
Spot Temperature ◽  
Operational Service

It is normal practice when designing electrical machines to design for operation within the maximum temperature limits of the insulation. If part of the winding is not effectively cooled under these conditions, the resulting temperature rise can damage the insulation and seriously reduce the length of operational service of the machine. This paper discusses a method of detecting high-temperature regions within a winding and of estimating the ‘hot spot’ temperature. The investigation has been concentrated on the design associated with a direct water-cooled winding, although the results could be applied generally on other electrical machines.

Thermal Model of Disk Coil With Directed Oil Flow

2008 ◽  
Author(s):  
Shahram Khalil Aria ◽  
Sahar Samsami
Keyword(s):  
Mathematical Model ◽  
Optimal Design ◽  
Temperature Rise ◽  
Thermal Model ◽  
Hot Spot ◽  
Exact Location ◽  
Oil Flow ◽  
Transformer Winding ◽  
Spot Temperature

In this paper, a developed mathematical model for temperature rise calculation is briefly described. In this model, at first, load loss of a transformer winding with forced directed oil is calculated and the winding temperature rise along the horizontal ducts and vertical ducts is computed. Then hot spot temperature and its exact location is determined. The model can also be used for optimal design of winding in size and cooling. Finally the results are given and compared with experiment values.

Research of Temperature Field in Oil-Immersed Transformer Considering the Oil Speed

2014 ◽  
Vol 912-914 ◽  
pp. 1041-1045
Author(s):  
Guo Liang Yue ◽  
Yong Qiang Wang ◽  
Jie He ◽  
Hong Liang Liu
Keyword(s):  
Temperature Field ◽  
Hot Spot ◽  
Element Model ◽  
Thermal Coupling ◽  
Normal Range ◽  
Steady State Temperature ◽  
Oil Flow ◽  
Transformer Winding ◽  
The Mathematical Model ◽  
Spot Temperature

In this paper, we have Elaborated the mathematical model of temperature field and flow field of the oil-immersed transformer, and analysis its structure of thermal .We established a temperature finite element model of an oil-immersed transformer using the method of flow-solid-thermal coupling. Using the software of ANSYS, simulating on a 250MVA oil-immersed transformer, we obtain the steady-state temperature distribution and the winding hottest locations. Analyze the effect of oil-speed to the temperature field and location of the hot spot temperature of oil-immersed transformer. The results show that when oil flow rate is increases in the normal range, Transformer temperature rise corresponding slowly, and its location hottest temperature slightly pulled accordingly. The fiber measure different speeds Oil immersed transformer winding hot spot temperature to provide a basis for positioning.

scholarly journals Analysis and Experiment of Hot-Spot Temperature Rise of 110 kV Three-Phase Three-Limb Transformer

Energies ◽  
2017 ◽  
Vol 10 (8) ◽  
pp. 1079 ◽  
Author(s):  
◽  
◽  
◽  
◽  
◽  
...  
Keyword(s):  
Temperature Rise ◽  
Hot Spot ◽  
Three Phase ◽  
Spot Temperature

Magneto-thermal coupling simulation and experimental verification for a three-winding high-frequency transformer

2021 ◽  
pp. 1-17
Author(s):  
Yadi Xu ◽  
Lin Li ◽  
Xuan Yuan
Keyword(s):  
Heat Transfer ◽  
High Frequency ◽  
Hot Spot ◽  
Convective Heat Transfer Coefficient ◽  
Core Material ◽  
Fe Model ◽  
Insulation Material ◽  
Thermal Coupling ◽  
High Frequency Transformer ◽  
Spot Temperature

As a core component of the power electronic transformer (PET) in DC network, the multi-level high-frequency power transformer has received great attention due to the insulation material fatigue problems resulting from the hot-spot temperature rises. To solve this problem, a three-winding high-frequency transformer for 10 kVA PET application is designed and made in the laboratory, and the loss and temperature rise distribution is calculated by means of the finite element (FE) electromagnetic-thermal coupling simulation. The influence of temperature on the hysteresis and loss properties of core material has been carefully considered and measured. The influence of skin effect and end effect on the winding loss is taken into account through the establishing three-dimensional FE model. Besides, the convective heat transfer coefficient is solved based on the principle of heat transfer instead of the empirical coefficient method. By compared with the experimental results, the calculated results are validated to be effective in predicting the loss and hot-spot temperature rises of the transformer.

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