Numerical Analysis of Transient Temperature Distribution Inside a Current Transformer

2010 ◽  
Vol 2 (3) ◽  
Author(s):  
Jie Cui ◽  
Mahesh Nadkarni ◽  
Satish M. Mahajan ◽  
Diego M. Robalino
Keyword(s):  
Temperature Distribution ◽  
Numerical Analysis ◽  
Performance Monitoring ◽  
Electrical Energy ◽  
Current Transformer ◽  
Transient Temperature ◽  
Transient Temperature Distribution ◽  
And Performance ◽  
A Current ◽  
Good Agreement

Current transformer (CT) is a device that transfers the electrical energy from one circuit to another through a shared magnetic field. In a CT, heat is generated in the core, tank wall, and primary and secondary windings. The performance of a CT is well indicated by the temperature distribution inside it. In this study, numerical analysis was performed to predict the temperature distribution inside the CT at every instant under different load conditions. It was found that the numerical results obtained were in good agreement with the experimental measurements. Thus, it was concluded that the numerical method can be a useful tool in CT design and performance monitoring.

Modeling of Temperature Distribution Inside a Current Transformer

2010 ◽  
Author(s):  
Jie Cui ◽  
Satish Mahajan ◽  
Diego Robalino
Keyword(s):  
Magnetic Field ◽  
Temperature Distribution ◽  
Electrical Energy ◽  
Current Transformer ◽  
Experimental Measurements ◽  
Tank Wall ◽  
The Core ◽  
A Current ◽  
Load Conditions ◽  
Good Agreement

Current transformer (CT) is a device that transfers the electrical energy from one circuit to another through a shared magnetic field. In a CT, heat is generated in the core, tank wall, primary and secondary windings. The performance of current transformer is well indicated by the temperature distribution inside a CT. In this study, numerical analysis was performed to predict the temperature distribution inside a CT at every instant under different load conditions. It was found that the numerical results obtained were in good agreement with the experimental measurements.

Semi Analytical Prediction of Automobile Body Temperature Distribution in the Top Coat Paint Oven

2009 ◽  
Author(s):  
P. Hanafizadeh ◽  
B. Sajadi ◽  
M. H. Saidi ◽  
H. Khalkhali ◽  
M. Taherraftar
Keyword(s):  
Temperature Distribution ◽  
Body Temperature ◽  
Thermal Behavior ◽  
The Body ◽  
Transient Temperature ◽  
Analytical Prediction ◽  
Experimental Procedure ◽  
Car Body ◽  
And Performance ◽  
Good Agreement

Automotive industry frequently needs to test new products, according to different production parameters, in order to determine the actual thermal behavior of bodies before mass production is implemented. Numerical simulation of these processes can reduce the very expensive and time consuming experimental procedures. For the drying and hardening process of the top paint applied in the coating process, the body temperature must be raised according to the paint manufacturer regulations. Consequently, prediction of temperature distribution of the car body during various zones of ovens is very vital in the design and performance analysis of the paint dryers. In this research, a novel semi-analytical approach has been used to predict the body temperature variation during the curing process. Considering the energy balance for the body, a set of differential equation has been extracted, depending on the oven zone. These equations can be solved numerically to find the transient temperature profile of the car body. Some parameters in these equations have been achieved by experimental procedure. The results show that the present model predictions are in a good agreement with the experimental data. Therefore, the developed model has a reasonable accuracy and can be used as an efficient robust approach to distinguish overall thermal behavior of the body. These techniques can be used to optimize the design of curing paint oven.

Direct observation of three-dimensional transient temperature distribution in SiC Schottky barrier diode under operation by optical-interference contactless thermometry (OICT) imaging

2022 ◽  
Author(s):  
Keiya Fujimoto ◽  
Hiroaki Hanafusa ◽  
Takuma Sato ◽  
Seiichiro HIGASHI
Keyword(s):  
Temperature Distribution ◽  
Schottky Barrier ◽  
Hot Spot ◽  
Local Heating ◽  
Three Dimensional ◽  
Schottky Barrier Diode ◽  
Transient Temperature ◽  
Optical Interference ◽  
Transient Temperature Distribution ◽  
Heating And Cooling

Abstract We have developed optical-interference contactless thermometry (OICT) imaging technique to visualize three-dimensional transient temperature distribution in 4H-SiC Schottky barrier diode (SBD) under operation. When a 1 ms forward pulse bias was applied, clear variation of optical interference fringes induced by self-heating and cooling were observed. Thermal diffusion and optical analysis revealed three-dimensional temperature distribution with high spatial (≤ 10 μm) and temporal (≤ 100 μs) resolutions. A hot spot that signals breakdown of the SBD was successfully captured as an anormal interference, which indicated a local heating to a temperature as high as 805 K at the time of failure.

Measurement of Transient Temperature Distribution at Anode Surface After Current Zero in Vacuum Interrupter

2021 ◽  
Vol 141 (11) ◽  
pp. 712-717
Author(s):  
Akira Daibo ◽  
Yoshimitsu Niwa ◽  
Naoki Asari ◽  
Wataru Sakaguchi ◽  
Yo Sasaki ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Anode Surface ◽  
Transient Temperature ◽  
Vacuum Interrupter ◽  
Transient Temperature Distribution ◽  
Current Zero

scholarly journals Exact Solution of Heat Transport Equation for a Heterogeneous Geothermal Reservoir

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2935 ◽  
Author(s):  
Sayantan Ganguly
Keyword(s):  
Temperature Distribution ◽  
Transport Equation ◽  
Heat Transport ◽  
Transport Processes ◽  
Geothermal Reservoir ◽  
Transient Temperature ◽  
Thermal Front ◽  
Transient Temperature Distribution ◽  
Heat Transport Equation ◽  
Geothermal Aquifer

An exact integral solution for transient temperature distribution, due to injection-production, in a heterogeneous porous confined geothermal reservoir, is presented in this paper. The heat transport processes taken into account are advection, longitudinal conduction and conduction to the confining rock layers due to the vertical temperature gradient. A quasi 2D heat transport equation in a semi-infinite porous media is solved using the Laplace transform. The internal heterogeneity of the geothermal reservoir is expressed by spatial variation of the flow velocity and the effective thermal conductivity of the medium. The model results predict the transient temperature distribution and thermal-front movement in a geothermal reservoir and the confining rocks. Another transient solution is also derived, assuming that longitudinal conduction in the geothermal aquifer is negligible. Steady-state solutions are presented, which determine the maximum penetration of the cold water thermal front into the geothermal aquifer.

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