Comprehensive Calculation of Winding Loss, Fluid and Temperature Field in Large Power Transformer

2014 ◽  
Vol 513-517 ◽  
pp. 3381-3384
Author(s):  
Yong Teng Jing ◽  
Yan Li ◽  
Longnv Li ◽  
Man Hua Jiang ◽  
Ning Wang
Keyword(s):  
Mathematical Model ◽  
Temperature Rise ◽  
Working Condition ◽  
Cooling System ◽  
Power Transformer ◽  
Hydraulic Loss ◽  
Operating Characteristics ◽  
Large Power ◽  
Oil Flow ◽  
Transformer Winding

This paper has make a deep theoretical analysis and experimental research according to the load loss of large capacity transformer which included the loss component decomposition, the analysis of the oil flow cooling system performance and working condition, the stray loss and temperature rise of the winding area. We have done the following work on the background of the 1000kV power transformer: The winding area loss was calculated based on the weight coefficient method and field circuit coupling method; considering that the hydraulic loss of the transformer cooling system is nonlinear and the nonlinear operating characteristics of the oil flow pump, establishing the cooling oil-way mathematical model of the transformers non winding area, and analysis the working condition of the transformer cooling system. Establishing the transformer winding multi-physics coupling mathematical model and researching the transformer winding heat problem based on the nonlinear influence of the material. The error between the windings numerical calculation results and the loss, winding temperature rise meet requirements of the engineering analysis according to this method. The calculation in this paper has high precision, and it can be used in the structure optimization of the large transformer winding.

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.

Calculation and Analysis of Winding Temperature Rise for ODAF Power Transformer

2012 ◽  
Vol 516-517 ◽  
pp. 1580-1583
Author(s):  
Yan Li ◽  
Yong Teng Jing ◽  
Longnv Li
Keyword(s):  
Temperature Rise ◽  
Power Transformer ◽  
Transformer Oil ◽  
Ansys Software ◽  
Flow Temperature ◽  
Numerical Heat Transfer ◽  
Oil Flow ◽  
Transformer Winding ◽  
Fluent Software ◽  
Volume Method

The AutoCAD, Gambit and ANSYS software are used to establish transformer oil flow-temperature rise model and mesh generation based on finite volume method, fluid mechanics and numerical heat transfer. A method that calculates temperature rise distribution of transformer winding regional wire and oil by FLUENT software, and a numerical example is given for an actual transformer.

The Heating System of Agricultural Facilities Using Excess Heat Power Transformers

2020 ◽  
Vol 67 (1) ◽  
pp. 42-47
Author(s):  
Anatoliy I. Sopov ◽  
Aleksandr V. Vinogradov
Keyword(s):  
System Design ◽  
Heat Supply ◽  
Cooling System ◽  
Power Transformer ◽  
Electric Heating ◽  
Heating System ◽  
Power Transformers ◽  
Large Power ◽  
Excess Heat ◽  
Power Centers

In power transformers, energy losses in the form of heat are about 2 percent of their rated power, and in transformers of large power centers reach hundreds of kilowatts. Heat is dissipated into the environment and heats the street air. Therefore, there is a need to consume this thermal energy as a source of heat supply to nearby facilities. (Research purpose) To develop methods and means of using excess heat of power transformers with improvement of their cooling system design. (Materials and methods) The authors applied following methods: analysis, synthesis, comparison, monographic, mathematical and others. They analyzed various methods for consuming excess heat from power transformers. They identified suitable heat supply sources among power transformers and potential heat consumers. The authors studied the reasons for the formation of excess heat in power transformers and found ways to conserve this heat to increase the efficiency of its selection. (Results and discussion) The authors developed an improved power transformer cooling system design to combine the functions of voltage transformation and electric heating. They conducted experiments to verify the effectiveness of decisions made. A feasibility study was carried out on the implementation of the developed system using the example of the TMG-1000/10/0.4 power transformer. (Conclusions) The authors got a new way to use the excess heat of power transformers to heat the AIC facilities. It was determined that the improved design of the power transformer and its cooling system using the developed solutions made it possible to maximize the amount of heat taken off without quality loss of voltage transformation.

scholarly journals Simulation of Fast-Rise Transients in a Large-Power Transformer Winding

2020 ◽  
Vol 62 (2) ◽  
pp. 478-488
Author(s):  
Fuhua Li ◽  
Yilu Liu ◽  
Alfonso G. Tarditi ◽  
Zhi Li
Keyword(s):  
Power Transformer ◽  
Large Power ◽  
Transformer Winding ◽  
Fast Rise

scholarly journals Влияние термических сопротивлений на холодильный коэффициент термоэлектрической системы охлаждения

2021 ◽  
Vol 91 (5) ◽  
pp. 743
Author(s):  
Е.Н. Васильев
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Power Supply ◽  
Cooling System ◽  
Thermoelectric Module ◽  
Current Strength ◽  
Temperature Control System ◽  
Operating Characteristics ◽  
Optimal Values ◽  
Supply Current

A thermoelectric cooling and temperature control system consisting of a thermoelectric module and devices for supplying and removing heat is considered. Based on a mathematical model that uses the operating characteristics of a serial thermoelectric module as initial data, the cooling coefficient of the cooling system was calculated taking into account the thermal resistances of the devices for supplying and removing heat. The dependences of the cooling coefficient on the current strength for different values of the cooling parameters are obtained. The analysis of optimal values of the power supply current of the thermoelectric module is carried out.

scholarly journals Determination of temperature distribution on windings of oil transformer based on the laws of heat transfer

ScienceRise ◽  
2021 ◽  
pp. 3-13
Author(s):  
Volodymyr Grabko ◽  
Stanislav Tkachenko ◽  
Oleksandr Palaniuk
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Temperature Distribution ◽  
Simulation Model ◽  
Power Transformer ◽  
Experimental Studies ◽  
Short Term ◽  
Transformer Winding ◽  
Transformer Equipment ◽  
Technological Product

Object of research: development of a technology for determining the temperature of the winding of a power oil transformer, in particular, the analysis of thermal processes in the winding of a power transformer during short-term overloads, taking into account the influence of the environment. Investigated problem: temperature distribution in the winding of a power oil transformer taking into account short-term load surges in the problem of assessing the residual life of the insulation of the transformer winding by temperature aging. The calculation of the temperature distribution in the winding was carried out using the passport data and characteristics of the power oil transformer, including the winding, transformer oil, load currents. Main scientific results: a mathematical model was calculated, with the help of which the results of temperature distribution in the transformer winding were obtained during short-term load surges or constant work with an increased load. According to the presented model, the analysis of the cooling time of the transformer winding after short-term overloads is carried out. Comparing the results obtained on the simulation model with the known results of experimental studies of the temperature distribution in the winding of a power transformer, the adequacy of the mathematical model is proved. It is shown that the use of the laws of heat transfer in a homogeneous plate to analyze the temperature distribution in the transformer winding is not wrong, but requires clarifications and simplifications. The area of practical use of the research results: enterprises of the machine-building industry and energy companies specializing in the production and operation of transformer equipment. Innovative technological product: simulation model of heat distribution in a transformer winding, which can take into account the load of the transformer, the effect of the environment on the insulation of the transformer windings. An innovative technological product: a method for diagnosing the duration of the non-failure operation of a transformer, which makes it possible to ensure trouble-free operation and save money for the repair of transformer equipment. Scope of application of the innovative technological product: design and development of diagnostic systems for windings of power oil transformers

A Mathematical Model for Studying the Pulse Flaw Detection of High-Voltage Transformer Windings

2021 ◽  
pp. 50-57
Author(s):  
Alexey V. LAVRINOVICH ◽  
◽  
Alexey V. MYTNIKOV ◽  
Keyword(s):  
Mathematical Model ◽  
Frequency Spectrum ◽  
Low Voltage ◽  
Power Transformer ◽  
Flaw Detection ◽  
Pulse Frequency ◽  
Voltage Transformer ◽  
Nanosecond Pulses ◽  
Transformer Winding ◽  
A Chain

The article presents the results from elaborating a power transformer mathematical model for modeling the processes of diagnosing the mechanical state of windings using the method of low-voltage nanosecond pulses. The model includes a chain representation of the transformer windings taking into account the dependence of the resistance and reactance of the turns on the frequency spectrum of the pulse supplied from the probing generator. The study of the pulse flaw detection processes carried out on the developed mathematical model has shown that the probing pulse frequency spectrum plays an essential role in locating the transformer winding flaw, in determining the flaw type (displacement of turns, inward radial displacement, buckling). The response signals obtained from application of the simulated probing pulse coincide satisfactorily with the response signals obtained during experiments on the transformer physical model. The developed model opens the possibility of determining, by calculation, transformer winding flaw location and type based on comparing the results of experimental responses during examinations of transformers using the method of low-voltage nanosecond pulses with the simulation results.

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