3-D coupled electromagnetic-fluid-thermal analysis of epoxy impregnated paper converter transformer bushings

Wang, Qingyu; Wang, Haoran; Peng, Zongren; Liu, Peng; Zhang, Tao; Hu, Wei

doi:10.1109/tdei.2016.005641

Cited by 55 publications

(24 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the leakage current flowing through the RIP core also produces ohmic heat, the power loss of the RIP core is <1% of that of the conductor. Therefore, it can be ignored due to its small amount [24]. According to the monitoring results of the inspection department in convector valve, the harmonic components of current flowing through bushing at the power system full load operation are shown in Table 3.…”

Section: Electromagnetic‐thermal‐fluid Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Research on the deterioration process of electrical contact structure inside the ±500 kV converter transformer RIP bushings and its prediction strategy

Tian

Liu

Zhou

et al. 2019

IET Generation, Transmission & Distribution

Self Cite

View full text Add to dashboard Cite

Section: Electromagnetic‐thermal‐fluid Methodsmentioning

confidence: 99%

“…The thermal conductivity of RIP, aluminium alloy and red copper were measured by using a laser flash thermophysical properties analyser then fitted by a polynomial under different temperature using MATLAB. Other parameters are provided in the literature [24, 26] and shown in Tables 4 and 5.…”

Section: Electromagnetic‐thermal‐fluid Methodsmentioning

confidence: 99%

Research on the deterioration process of electrical contact structure inside the ±500 kV converter transformer RIP bushings and its prediction strategy

Tian

Liu

Zhou

et al. 2019

IET Generation, Transmission & Distribution

Self Cite

View full text Add to dashboard Cite

“…Different grounding plate radii mean different core thicknesses and the temperature distributions of the ±400 kV converter transformer bushing when the core thicknesses were 97.5, 147.5, 197.5, 247.5 and 297.5 mm were obtained as shown in Fig. 7, by using the 3‐D electromagnetic‐fluid‐thermal coupling analysis method [16]. With an increase of the core thickness, the temperature of the bushing increased because the thermal resistance of the core increased.…”

Section: Effect Of the Core Outline Size On The Electro‐thermal Couplmentioning

confidence: 99%

“…In our previous paper [16], the 3‐D electromagnetic‐fluid‐thermal coupling analysis method was applied and the temperature distribution of a ±400 kV converter transformer bushing under the AC current load at power frequency was calculated, and through the temperature rising test of the bushing, the simulation method was verified accurate and reasonable; a novel dissipating heat structure including the heat conductors and the thermal conductive oil inside the inner conductor was proposed [17], and through applying the novel dissipating heat structure, the temperature of the ±400 kV converter transformer valve side bushing was improved. After structure optimization and according to the simulation, the temperature of the core under the current of 5515 A in the temperature rise test was below 120 °C and the temperature distribution of the bushing satisfied the demand of the project.…”

Section: Introductionmentioning

confidence: 99%

Electro‐Thermal Coupling Field Simulation of Converter Transformer Valve Side Bushings

Wang

Xie

Tian

et al. 2020

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

In the actual operation, converter transformer valve side bushings are subjected to high voltages and large current loads with large number of harmonics simultaneously. In our previous papers, using the 3-D electromagnetic-fluid-thermal coupling analysis method, the 3-D temperature distribution of a converter transformer valve side bushing was researched, and the heating and dissipation characteristics of the bushing were analyzed. However, the electric field distribution of the bushing is affected by the temperature gradient inside the bushing. Related researches about the electro-thermal coupling field of the bushing are rare and most researches are concentrated on the single factor of voltage or temperature. In this paper, by using the electro-thermal coupling field simulation method proposed in our previous paper, the effect of the core outline size on the electric field distribution of the bushing under a certain temperature gradient was investigated. In addition, by using the transient electric field simulation method, the electric field distribution of the bushing in one cycle subjected to an actual voltage waveform and the current in temperature rise test simultaneously was analyzed considering the effect of the Joule heating power of the core. The proposed method will be able to provide a computation basis for the structure design and optimization of converter transformer valve side bushings.

show abstract

“…As an electromagnetic-fluid-thermal field coupling problem, the calculation of the temperature rise inside the transformer is rather complex. Therefore, it is necessary to find a highly efficient and stable numerical method for multi-physics coupling problems [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Fluid-Thermal Field in Oil-Immersed Transformer Winding Based on Dimensionless Least-Squares and Upwind Finite Element Method

et al. 2018

View full text Add to dashboard Cite

In order to study the coupling fluid and thermal problems of the local winding in oil-immersed power transformers, the least-squares finite element method (LSFEM) and upwind finite element method (UFEM) are adopted, respectively, to calculate the fluid and thermal field in the oil duct. When solving the coupling problem by sequential iterations, the effect of temperature on the material property and the loss density of the windings should be taken into account. In order to improve the computation efficiency for the coupling fields, an algorithm, which adopts two techniques, the dimensionless LSFEM and the combination of Jacobi preconditioned conjugate gradient method (JPCGM) and the two-side equilibration method (TSEM), is proposed in this paper. To validate the efficiency of the proposed algorithm, a local winding model of a transformer is built and the fluid field is computed by the conventional LSFEM, dimensionless LSFEM, and the Fluent software. While the fluid and thermal computation results of the local winding model of a transformer obtained by the two LSFEMs are basically consistent with those of the Fluent software, the stiffness matrix, which is formed by the dimensionless scheme of LSFEM and preconditioned by the JPCGM and TSEM, has a smaller condition number and a faster convergence rate of the equations. Thus, it demonstrates a broader applicability.

show abstract

3-D coupled electromagnetic-fluid-thermal analysis of epoxy impregnated paper converter transformer bushings

Cited by 55 publications

References 15 publications

Research on the deterioration process of electrical contact structure inside the ±500 kV converter transformer RIP bushings and its prediction strategy

Research on the deterioration process of electrical contact structure inside the ±500 kV converter transformer RIP bushings and its prediction strategy

Electro‐Thermal Coupling Field Simulation of Converter Transformer Valve Side Bushings

Simulation of Fluid-Thermal Field in Oil-Immersed Transformer Winding Based on Dimensionless Least-Squares and Upwind Finite Element Method

Contact Info

Product

Resources

About