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

Li, Yan; Li, Longnv; Jing, Yongteng; Li, Shuangpeng; Zhang, Fengge

doi:10.1109/icems.2013.6754556

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Hence there are a lot of FEM and FD based solution found in the literature for core loss calculation. But few of them pay attention to the thermal aspects in the core temperature rise [13,18,[24][25][26][27][28]. This heat transfer problem can be solved by using three-dimensional finite element or finite difference thermal formulations with the anisotropic thermal material properties taken into account [7,[28][29][30][31].…”

Section: Finite Difference and Finite Element Methodsmentioning

confidence: 99%

Comparison of Methods for Calculation of Core-Form Power Transformer’s Core Temperature Rise

Orosz

Kleizer

Iváncsy

et al. 2016

Period. Polytech. Elec. Eng. Comp. Sci.

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The temperature rise calculation of core-type power transformers is an essential question in the design process however this is neglected during the preliminary optimization process. The methods of the calculation methods are classified and introduced shortly and they applicability is examined for the preliminary design process. For comparison of the methods performance, two core arrangements were examined, the Roth's transformer and a 50 MVA three-phase transformers' core. The result shows that the FEM method provides the most accurate solution however according to its simplicity, the Ryder's method has better performance in the preliminary design stage.

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Section: Finite Difference and Finite Element Methodsmentioning

confidence: 99%

Comparison of Methods for Calculation of Core-Form Power Transformer’s Core Temperature Rise

Orosz

Kleizer

Iváncsy

et al. 2016

Period. Polytech. Elec. Eng. Comp. Sci.

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“…After modification, the calculation formula of copper consumption is a function of temperature θ, as shown in (13).…”

Section: Temperature Loss Correctionmentioning

confidence: 99%

“…In (13), Ii is the phase current of the transformer's primary and secondary windings, i=1,2; θk is the temperature correction factor, which take 235℃ for the copper material; θr is the temperature at which the rated parameter is measured, usually 75℃. θ is the current temperature of the winding material, which corresponding approximate value is obtained according to the oil temperature model; Pdc and Pfj refer to DC resistance loss of winding and additional loss of winding respectively, and Rated stands for rating.…”

Section: Temperature Loss Correctionmentioning

confidence: 99%

Calculation model of hot-spot temperature of transformer winding based on top-oil temperature

Dong,

Liu,

Chen

et al. 2023

Third International Conference on Electronics, Electrical and Information Engineering (ICEEIE 2023)

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Oil-immersed type transformer is an essential part of electric power system, and the hot-spot temperature of the winding is closely related to the oil temperature at the top of the transformer. In this paper, modeling of the thermal circuit based on the distribution of the top oil temperature of the double-wound transformer. On the basis of the consideration of nonlinear characteristics of thermal resistance of insulating oil, we also considered the influence of oil stickiness and the thermal capacitance of transformer components (iron core, insulating oil, windings) with temperature changes, and introduced the cooling ways and winding loss correction factors in the model. The Runge-Kutta method is selected to resolve the model parameters, which further simplified the calculation process. Above all, the improved model of hotspot temperature of transformer winding is proposed. Contrast with testing transformer measured data in laboratory and calculation result of traditional hot spot analogy method, the model shows good consistency in the light load (around 20% and 40%), which can well describe the transient temperature change and propose a new method to calculate the hotspot temperature of transformer winding.

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“…About the type test of power and electronic transformers, criteria of IEC61558-1 (safety of power transformers, power supplies, reactors and similar products-Part1: General requirements and tests) [1] is abided by, in which the heating of each winding is the main contents of the temperature rise test. At present, a great deal of researches focus on calculation and analysis of hot-spot temperature rise of transformer windings [2][3][4][5]. In view of the relatively low integrated and automation degree of the test equipments and devices in the domestic laboratory, the test item of temperature rise with the complicated operation procedure required in the IEC standard has to be performed manually in the past, including connecting the corresponding test circuit, setting and switching the test conditions, matching the different testing methods exactly to the various types of samples, and the ultimate arrangement and implementation of the entire testing process.…”

Section: Introductionmentioning

confidence: 99%

Automatic Measurement and Control System of Temperature Rise Test for the Power Electronic Transformers

Shen

Wan

et al. 2015

AMM

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In the domestic certification bodies the automation degree of the definitive test of the accessories products left much to be improved, as for safety of the transformer conforming to the international standard of IEC61558-1, the traditional manual testing method barely meets the requirements of sampling rate, and has caused a lot of technical deficiencies including inadmissible deviation in the calculation and post-processing of the related experimental data, lengthy work-time of staff, and low test efficiency. In this paper, concerning the type test of various electronic and power transformers, a set of intelligent automatic measurement and control system of the temperature rise test is presented, consisting of software packages with modularized designing and an original hardware apparatus with built-in control modules. Therefore this system is capable of performing a series of operations without human intervention, such as controlling of the related testing equipment, data analysis, real-time monitoring, timing acquisition and data processing of corresponding algorithms, auto-save of test configuration and generating original record of the test. Thus, the idea of ‘Full automation with only one simple configuration’ has truly been realized. The experimental results show that compared with the traditional testing method, the application of this system minimized uncertainty caused by human factors in the testing process and improve precision of data analysis, and also ensured the reproducibility, consistency and traceability of the test results effectively.

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

Cited by 6 publications

References 2 publications

Comparison of Methods for Calculation of Core-Form Power Transformer’s Core Temperature Rise

Comparison of Methods for Calculation of Core-Form Power Transformer’s Core Temperature Rise

Calculation model of hot-spot temperature of transformer winding based on top-oil temperature

Automatic Measurement and Control System of Temperature Rise Test for the Power Electronic Transformers

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