Short Circuit Stress Analysis Using FEM in Power Transformer on H-V Winding Displaced Vertically &amp; Horizontally

Ahmad, Ashfaq; Javed, Iqra; Nazar, Waseem; Mukhtar, Muhammad Asim

doi:10.1016/j.aej.2016.10.006

Cited by 16 publications

(14 citation statements)

References 5 publications

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“…The philosophy of such efforts is to model the geometry of a winding using Maxwell's equations to compute the inductance and capacitance matrices. The computed elements are then used in the equivalent circuit model to reproduce the FRA measurements [26,27].…”

Section: Objective and Motivationmentioning

confidence: 99%

Enhanced modelling of the transformer winding high frequency parameters identification from measured frequency response analysis

Chanane

Houassine

Bouchhida

2019

IET Generation, Transmission & Distribution

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Section: Objective and Motivationmentioning

confidence: 99%

Enhanced modelling of the transformer winding high frequency parameters identification from measured frequency response analysis

Chanane

Houassine

Bouchhida

2019

IET Generation, Transmission & Distribution

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“…Previously calculated and SAT are considered as 3 and 4 , respectively, for parallel connection calculation. is calculated as 0.9992 (= 1 − (1 − 0.964)(1 − 0.979)) by using (5).…”

Section: Reliability Analysismentioning

confidence: 99%

“…Therefore, the total reliability of Class 1E Bus is 0.9992. As shown in Figure 8, the reliability of Class 1E Bus in the modified electric power system is estimated in accordance with the reliability block diagram (see Figure 9) and calculations by using (4) and (5).…”

Section: Reliability Analysismentioning

confidence: 99%

See 1 more Smart Citation

Separation of Transformers for Class 1E Systems in Nuclear Power Plants

Lee

Chang

2017

Science and Technology of Nuclear Installations

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In order to supply electric power to the safety related loads, safety and reliability of onsite power have to be ensured for the safety function performance in nuclear power plants. Even though the existing electric power system of APR1400 meets the requirements of codes regarding Class 1E system, there is a room for improvement in the design margin against the voltage drop and short circuit current. This paper discusses the amount that the voltage drop and short circuit current occur in the existing electric power system of APR1400. Additionally, this paper studies with regard to the improved model that has the extra margin against the high voltage drop and short circuit current by separation of unit auxiliary transformer (UAT) and standby auxiliary transformer (SAT) for the Class 1E loads. The improved model of the electric power system by separation of UAT and SAT has been suggested through this paper. Additionally, effects of reliability and cost caused by the electric power system modification are considered.

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“…The literature presents some papers dedicated to simulating a power transformer using a finite element method (FEM) considering the model-based in the thermal properties [5][6][7][8][9][10] and electromagnetic phenomena [11][12][13][14][15]. Some other papers also inves-tigate coupled thermal electromagnetic modeling of the equipment [16,17]; however, the literature is still limited.…”

Section: Introductionmentioning

confidence: 99%

Coupled Electromagnetic-Thermal Simulation of a Power Transformer by 3d Fem

Henriques

Vizeu²,

Souza³

et al. 2020

Acta Polytech

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Power transformers are the most common equipment in an electric power system, which has been manufactured in the last decade. However, overheating can damage them, considerably reducing their operation lives, which may cause economic losses to the power utilities. The motivation of this paper is to investigate the time and power overload limits that a power transformer can be subjected to and how it will impact its temperature. Investments in the grid can be delayed if a transformer can support some overload during some momentary load demand increase. In this context, this paper presents a study of a 30/40MVA power transformer by 3D finite element method (FEM) for coupled thermal-electromagnetic simulations to investigate its thermal behaviour when it is submitted to its nominal load at a steady-state operation and a variable load during a period of one day. The simulations were performed with the commercial software packages Flux 3D and AcuSolve, for electromagnetic and thermal modelling, respectively. The modelled equipment was based on a power transformer installed in the Light Serviços de Eletricidade S.A, the utility that supplies electrical energy to the city of Rio de Janeiro, in Brazil. Since the literature doesn’t present many works simulating coupled thermal-electromagnetic power transformers in 3D-FEM, this paper has the goal to bring new contributions to this field. Three study cases were modelled, and some simplifications in transformer’s geometry were made in some of them to reduce the computation time usually required for such a simulation. The obtained results are presented and compared with the measured values for the temperature in the hot spot of the transformer and in the top of the oil, to investigate the impact of these simplifications in the calculated results.

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Short Circuit Stress Analysis Using FEM in Power Transformer on H-V Winding Displaced Vertically & Horizontally

Cited by 16 publications

References 5 publications

Enhanced modelling of the transformer winding high frequency parameters identification from measured frequency response analysis

Enhanced modelling of the transformer winding high frequency parameters identification from measured frequency response analysis

Separation of Transformers for Class 1E Systems in Nuclear Power Plants

Coupled Electromagnetic-Thermal Simulation of a Power Transformer by 3d Fem

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