Loss separation measurements for several electrical steels

Foster, K.; Werner, Felicitas; Vecchio, Robert M. Del

doi:10.1063/1.330350

Cited by 38 publications

(5 citation statements)

References 5 publications

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“…Energy loss components of the material were calculated based on the modelled DHL of Fig 11; the results showed that hysteresis energy loss , classical eddy current energy loss , and excess energy loss components account for 41 %, 24 % and 35 % of the total energy loss, respectively. These results are in compliance with the results reported by other researchers for 3 % SiFe GO steels at magnetizing frequency of 50 Hz and peak flux density of 1.7 T [19], [31][32].…”

Section: Constructing the Dynamic Hysteresis Loop (Dhl)supporting

confidence: 93%

“…This is a reliable means to validate the modelling results, specifically the constructed SHL, which is in line with the phenomenology of magnetic hysteresis outlined in section II.Energy loss components of the material were calculated based on the modelled DHL of Fig11; the results showed that hysteresis energy loss , classical eddy current energy loss , and excess energy loss components account for 41 %, 24 % and 35 % of the total energy loss, respectively. These results are in compliance with the results reported by other researchers for 3 % SiFe GO steels at magnetizing frequency of 50 Hz and peak flux density of 1.7 T[19],[31][32].To increase accuracy of the modelling at higher frequencies, a new empirical function with the general form of (9) was defined:…”

supporting

confidence: 86%

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Static hysteresis modeling for grain-oriented electrical steels based on the phenomenological concepts of energy loss mechanism

Hamzehbahmani

2021

Journal of Applied Physics

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This paper proposes an advanced approach to construct static hysteresis loop of Grain-Oriented (GO) electrical steels for dynamic modelling and energy loss analysis. The proposed approach is in line with the magnetic hysteresis and phenomenological concepts of ratedependent and rate-independent energy loss components of ferromagnetic materials under time varying magnetic fields. The proposed method can predominantly describe energy loss mechanism and magnetization processes of the material. Accuracy of this technique was validated on Epstein size laminations of 3 % GO silicon steels. The results explicitly confirmed the effectiveness of the proposed method in dynamic hysteresis modelling of GO electrical steels at magnetizing frequencies up to 1 kHz and peak flux densities up to 1.7 T.

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Section: Constructing the Dynamic Hysteresis Loop (Dhl)supporting

confidence: 93%

supporting

confidence: 86%

Static hysteresis modeling for grain-oriented electrical steels based on the phenomenological concepts of energy loss mechanism

Hamzehbahmani

2021

Journal of Applied Physics

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“…Iron core losses in grain-oriented (GO) steel, the predominant transformer core material, can be divided into three general categories: static hysteresis (which account for about 40% of the total), classical eddy current (about 20%), and excess losses (about 40%) [17]- [19]. The term excess loss reflects the fact that it is anomalous from the viewpoint of the classical loss theory [20], which is mainly applied to non-oriented ("dynamo") steels used in generators and motors.…”

Section: Hysteresis Modelingmentioning

confidence: 99%

Duality-Derived Transformer Models for Low-Frequency Electromagnetic Transients—Part II: Complementary Modeling Guidelines

Jazebi

Rezaei-Zare

Lambert

et al. 2016

IEEE Trans. Power Delivery

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This two-part paper is intended to clarify definitions in dual transformer modeling that are vague, provide accurate modeling guidelines, clarify misconceptions about numerical instability, provide a unified dual model for a specific type of transformer, and introduce new paths of research to the power systems/electrical machinery community for low-frequency transients. Part I discussed the topology of duality-based models and some important issues, such as the most common approaches to derive dual models and their variety, the equivalence of negative inductance and mutual couplings to represent the leakage inductance of three-winding transformers, and the numerical oscillations caused by the use of nontopological models. This part of the paper discusses and compares white-, gray-, and black-box models. The paper also reviews hysteresis models (static and dynamic) and highlights the differences between the air-core inductance and saturation inductance. The available dual models for the representation of the transformer tank are then presented. A unified and accurate model of a three-phase core-type transformer adequate for all lowfrequency transients is presented. Finally, concrete guidelines are

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“…Letting (4) The losses per phase vary with time as (5) and their average value is (defined above). Replacing by , by (6) it is possible to integrate to obtain (7) Under the same conditions, consumes . Since and should consume the same core losses for a given voltage , the bracketed expression in (7) is obviously defined above (static conductance)…”

Section: B Identification Of Those Conductances 1) Static Conductancementioning

confidence: 99%

Analytical model of iron losses in power transformers

Elleuch¹,

Poloujadoff²

2003

IEEE Trans. Magn.

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We have improved a circuit model of transformers by defining a conductance whose losses will be close to the iron losses under any circumstance. Connecting a constant conductance cs in parallel with the main magnetizing inductance is very popular in the literature; however, it is acceptable only if the flux amplitude and frequency are reasonably constant during the time of operation, and if the value can be properly adjusted. Here, we replace cs with a nonlinear dynamic conductance cd , whose losses are a function of flux amplitude. This conductance is based on the concept of dynamical hysteresis. Its definition is such that it is determined by the same test results used for cs . Knowing the values of losses given by the manufacturer of the sheets, and the measured values of iron losses of a transformer, we can then analytically express the building factor as a function of the maximum flux density. We have applied the method to a three-leg 10-kVA transformer. It allows us to identify the cases when iron losses may be ignored, when they may be represented by a constant conductance, and when they must be represented by a nonlinear conductance.

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Loss separation measurements for several electrical steels

Cited by 38 publications

References 5 publications

Static hysteresis modeling for grain-oriented electrical steels based on the phenomenological concepts of energy loss mechanism

Static hysteresis modeling for grain-oriented electrical steels based on the phenomenological concepts of energy loss mechanism

Duality-Derived Transformer Models for Low-Frequency Electromagnetic Transients—Part II: Complementary Modeling Guidelines

Analytical model of iron losses in power transformers

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