Accounting for the Influence of the Tank Walls in the Zero-Sequence Topological Model of a Three-Phase, Three-Limb Transformer

Zirka, S. E.; Moroz, Y.I.; Arturi, C.M.

doi:10.1109/tpwrd.2014.2307117

Cited by 30 publications

(36 citation statements)

References 18 publications

(28 reference statements)

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“…This value (2.335 T) considers a snapshot of the flux density distribution that corresponds to the worst saturation conditions. This case occurred in many previous works, such as mild steel BS‐4360 material in Charalambous et al, in which the flux density reached 2.21 T, and high‐grain‐oriented silicon steel HiB‐27ZH95 material in Yang et al, in which the flux density reached 2.36 T at the operating flux density of 1.7 T. Furthermore, the MFD distribution for the high‐grain‐oriented silicon steel HiB‐27ZH95 material in 3D magnetization reached 2.18 T in Li et al The flux density of the M‐5 oriented steel material in the core reached 2.36 T in Arslan et al at the operating flux density of 2 T. In Tang et al, the 3D flux distribution results of the fifth lamination layer with SSL 45° mitered joints showed that the operating flux density of M‐6 material reached 2 to 2.53 T. By contrast, the magnetic field distribution of the transformer model obtained by FEM in Yang et al reached 2.87 T when the operating flux density of core material steel 1008 is 2.58 T. In addition, the value of flux densities in limb “A,” and the adjacent yoke is more than 2.5 T for the grain‐oriented steel.…”

Section: Resultssupporting

confidence: 71%

A new approach of core structure model for 3-phase distribution transformer

Alyozbaky

Kadir

Izadi

et al. 2018

Int Trans Electr Energ Syst

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Summary Reducing the losses of 3‐phase transformers is still considered a significant target by many transformer designers and manufacturers. Core joint design is one of the factors related to the losses. In previous studies, core losses and flux density distribution motivated researchers to design appropriate T‐joints. However, the variation of load and thermal profiles are the most important factors related to the losses in transformers. This study proposed a new T‐joint configuration for the core of the 3‐phase transformer. The proposed model was built after considering the variation of load and thermal profiles. Results were compared with those of conventional T‐joint designs, such as butt‐lap and 45° mitered designs, that are currently used. The no‐load losses of the proposed model were reduced by more than 6.8% and 10% compared with those of the butt‐lap and mitered T‐joint designs, respectively. Furthermore, the total losses, the hot spot temperature of the core, and the oil temperature decreased significantly. The proposed model contributes to the literature on new T‐joint designs for improving transformer performance.

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Section: Resultssupporting

confidence: 71%

A new approach of core structure model for 3-phase distribution transformer

Alyozbaky

Kadir

Izadi

et al. 2018

Int Trans Electr Energ Syst

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“…Without affecting numerical calculation results, they stabilize the solution (simulation) by maintaining the current circuit (the physical sense-the way for leakage current), which is especially important when a discrete change of the resistance of a IM circuit occurs, for example, when powered from the frequency converter or in the case of the phase circuit breaking. A similar solution is described in [10].…”

Section: The Implementation Of a Computer Modelmentioning

confidence: 97%

Induction Electrical Machine Simulation at Three-Phase Stator Reference Frame: Approach and Results

Pustovetov¹

2020

Applied Electromechanical Devices and Machines for Electric Mobility Solutions

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This chapter provides the equations of mathematical model of three-phase induction electrical machine recorded in the three-phase stator reference frame. The possibilities of the proposed mathematical model are described in detail. This chapter also discusses the development of the computer model of an induction motor based on the abovementioned mathematical model. It uses an approach that allows combining during preparation the computer model dual methods: means of visual programming circuitry (in the form of electrical schematics) and logical one (in the form of block diagrams). The approach enables easy integration of the model of an induction motor as part of more complex models of electrical complexes and systems. The developed computer model gives the user access to the beginning and the end of a winding of each of the three phases of the stator and rotor. This property is particularly important when considering the asymmetric modes of operation or when powered by the special circuitry of semiconductor converters. Simulation results show the adequacy of the proposed mathematical model of induction electrical machine.

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“…The role of inductance L 04 was explained in [4]. Since the modeled five-limb transformers have reinforced yokes (A yoke = 0.6 A leg ), the variation of L 04 in the range [0, L S12 ] does not affect the model behavior, and L 04 was set equal to L S12 .…”

Section: Topological Transformer Modelmentioning

confidence: 99%

“…The role of the off-core fluxes and thus the necessity for a detailed tank model is different for different transformer constructions. The off-core flux is significant in three-limb three-phase transformers, so a transient model of the tank was proposed in [4]. The lesser role of the tank in five-limb transformers is caused by the presence of the end (lateral) core limbs providing the paths for the unbalanced (zero-sequence) flux.…”

Section: Introductionmentioning

confidence: 99%

Topological Transient Models of Three-Phase Five-Limb Transformer

Zirka¹,

Moroz²,

Arturi

et al. 2018

E&E

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Purpose. To show capabilities of topological models of three-phase, five-limb transformer to correctly represent transformer operation in regimes with high flux densities in the core. As a practically important example, time domain response of transformer subjected to geomagnetically induced currents (GIC) is analyzed and compared with results of a comprehensive field experiment. Methodology. Transformer magnetic model, which takes into account geometry of the core and windings, is transformed in a dual electric equivalent scheme, whose transient is calculated by using EMTP-ATP. The results obtained demonstrate the importance of incorporating the positive and zero sequence impedances of power network. Findings. A simple and reliable model of five-limb transformer is proposed. It was found that the presence of the transformer tank can be effectively accounted for by linear inductances representing the paths of the off-core fluxes from yoke to yoke. The modeling of GIC events represented in the paper is the most accurate ever obtained for threephase, five-leg transformers. The model is validated by close agreement of the predicted values and waveforms of the phase currents and reactive power with those measured in tests performed on two 400 MVA transformers connected back-to-back and to a 400 kV power network. Originality. It is shown that a simplified non-hysteresis model developed portrays the behavior of the of five-limb transformer under GIC condition with the same good accuracy as its hysteresis model. Both the transformer models are well grounded. So, the paper dispels some misconceptions about the influence of the hysteresis properties of the core material and tank in transient modeling of five-leg transformers. Practical value. The practical value and significance of the paper is caused by the fact that the model proposed is a simple and reliable tool for power system studies. The paper warns of using unnecessary complicated models whose parameters are difficult to be estimated by experiments or calculations.

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Accounting for the Influence of the Tank Walls in the Zero-Sequence Topological Model of a Three-Phase, Three-Limb Transformer

Cited by 30 publications

References 18 publications

A new approach of core structure model for 3-phase distribution transformer

A new approach of core structure model for 3-phase distribution transformer

Induction Electrical Machine Simulation at Three-Phase Stator Reference Frame: Approach and Results

Topological Transient Models of Three-Phase Five-Limb Transformer

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