scholarly journals Effects of Air Gaps on Core Losses of Shunt Reactors / Şönt Reaktörlerde Hava Aralıklarının Demir Kayıplarına Etkisi

2016 ◽  
Vol 12 (1) ◽  
Author(s):  
Atilla Dönük
Keyword(s):  
Air Gaps ◽  
Core Losses ◽  
Shunt Reactors

Investigating Effects of Distance Air-Gaps on Iron-Core Shunt Reactors

2022 ◽  
pp. 545-557
Author(s):  
Tu Pham Minh ◽  
Hung Bui Duc ◽  
Thinh Tran Van ◽  
Dung Dang Chi ◽  
Vuong Dang Quoc
Keyword(s):  
Iron Core ◽  
Air Gaps ◽  
Shunt Reactors

scholarly journals Finite Element Modeling of Shunt Reactors Used in High Voltage Power Systems

2021 ◽  
Vol 11 (4) ◽  
pp. 7411-7416
Author(s):  
T. P. Minh ◽  
H. B. Duc ◽  
N. P. Hoai ◽  
T. T. Cong ◽  
M. B. Cong ◽  
...  
Keyword(s):  
Finite Element ◽  
Power Systems ◽  
High Voltage ◽  
Reactive Power ◽  
Magnetic Circuit ◽  
Iron Core ◽  
Air Gaps ◽  
Extra High Voltage ◽  
Shunt Reactors ◽  
Copper Losses

Shunt reactors are important components for high-voltage and extra high voltage transmission systems with large line lengths. They are used to absorb excess reactive power generated by capacitive power on the lines when no-load or under-load occurs. In addition, they play an important role in balancing the reactive power on the system, avoiding overvoltage at the end of the lines, and maintaining voltage stability at the specified level. In this paper, an analytical method based on the theory of magnetic circuit model is used to compute the electromagnetic fields of shunt reactors and then a finite element method is applied to simulate magnetic field distributions, joule power losses, and copper losses in the magnetic circuit. In order to reduce magnetic flux and avoid magnetic circuit saturation, it is necessary to increase the reluctance of the magnetic circuit by adding air gaps in the iron core. The air gaps are arranged along the iron core to decrease the influence of flux fringing around the air gap on shunt reactors' total loss. Non-magnetic materials are often used at the air gaps to separate the iron cores. The ANSYS Electronics Desktop V19.R1 is used as a computation and simulation tool in this paper.

scholarly journals AC Magnetic Loss Reduction of SLM Processed Fe-Si for Additive Manufacturing of Electrical Machines

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1241
Author(s):  
Hans Tiismus ◽  
Ants Kallaste ◽  
Anouar Belahcen ◽  
Marek Tarraste ◽  
Toomas Vaimann ◽  
...  
Keyword(s):  
Magnetic Measurements ◽  
Magnetic Loss ◽  
Core Loss ◽  
Soft Magnetic Materials ◽  
Loss Reduction ◽  
Soft Magnetic ◽  
Cross Sectional ◽  
Air Gaps ◽  
Advantages And Disadvantages ◽  
Core Losses

Additively manufactured soft magnetic Fe-3.7%w.t.Si toroidal samples with solid and novel partitioned cross-sectional geometries are characterized through magnetic measurements. This study focuses on the effect of air gaps and annealing temperature on AC core losses at the 50 Hz frequency. In addition, DC electromagnetic material properties are presented, showing comparable results to conventional and other 3D-printed, high-grade, soft magnetic materials. The magnetization of 1.5 T was achieved at 1800 A/m, exhibiting a maximum relative permeability of 28,900 and hysteresis losses of 0.61 (1 T) and 1.7 (1.5 T) W/kg. A clear trend of total core loss reduction at 50 Hz was observed in relation to the segregation of the specimen cross-sectional topology. The lowest 50 Hz total core losses were measured for the toroidal specimen with four internal air gaps annealed at 1200 °C, exhibiting a total core loss of 1.2 (1 T) and 5.5 (1.5 T) W/kg. This is equal to an 860% total core loss reduction at 1 T and a 510% loss reduction at 1.5 T magnetization compared to solid bulk-printed material. Based on the findings, the advantages and disadvantages of printed air-gapped material internal structures are discussed in detail.

Determination of eddy current losses and hysteresis losses in magnetic circuits of electrical machines

2020 ◽  
pp. 54-58
Author(s):  
S. M. Plotnikov
Keyword(s):  
Eddy Current ◽  
Magnetization Reversal ◽  
Eddy Currents ◽  
Technical Problem ◽  
Electrical Machines ◽  
Eddy Current Losses ◽  
Hysteresis Losses ◽  
Magnetic Circuits ◽  
Core Losses ◽  
Reversal Frequency

The division of the total core losses in the electrical steel of the magnetic circuit into two components – losses dueto hysteresis and eddy currents – is a serious technical problem, the solution of which will effectively design and construct electrical machines with magnetic circuits having low magnetic losses. In this regard, an important parameter is the exponent α, with which the frequency of magnetization reversal is included in the total losses in steel. Theoretically, this indicator can take values from 1 to 2. Most authors take α equal to 1.3, which corresponds to the special case when the eddy current losses are three times higher than the hysteresis losses. In fact, for modern electrical steels, the opposite is true. To refine the index α, an attempt was made to separate the total core losses on the basis that the hysteresis component is proportional to the first degree of the magnetization reversal frequency, and the eddy current component is proportional to the second degree. In the article, the calculation formulas of these components are obtained, containing the values of the total losses measured in idling experiments at two different frequencies, and the ratio of these frequencies. It is shown that the rational frequency ratio is within 1.2. Presented the graphs and expressions to determine the exponent α depending on the measured no-load losses and the frequency of magnetization reversal.

A Simple Calculation Method of Flashover Characteristics for Long Air Gaps under Various Discharge Conditions

1993 ◽  
Vol 113 (3) ◽  
pp. 252-258
Author(s):  
Kiyoto Nishijima ◽  
Itaru Tsuneyasu ◽  
Hiraku Nakahodo ◽  
Masaharu Minakami
Keyword(s):  
Calculation Method ◽  
Simple Calculation ◽  
Air Gaps

ALLOY 48

Alloy Digest ◽  
1975 ◽  
Vol 24 (6) ◽  
Keyword(s):  
Iron Alloy ◽  
Heat Treating ◽  
Magnetic Core ◽  
High Permeability ◽  
Nickel Iron ◽  
Core Losses ◽  
Instrument Transformers ◽  
Nickel Iron Alloy ◽  
Shielding Material ◽  
Communication Equipment

Abstract ALLOY 48 is a vacuum-melted, 48% nickel-iron alloy designed for high permeability, and low core losses. It is ideal in applications requiring efficient magnetic core materials, such as audio and instrument transformers, instrument relays, and many other communication equipment devices. It is excellent for rotor and stator laminations, and is also a very effective magnetic shielding material. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Fe-52. Producer or source: Magnetics Specialty Metals Division. See also Alloy Digest Fe-96, April 1992.

ROUND PERMALLOY 80

Alloy Digest ◽  
1976 ◽  
Vol 25 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Magnetic Core ◽  
Molybdenum Alloy ◽  
Nickel Iron ◽  
Low Field ◽  
Core Losses ◽  
Very High

Abstract Round Permalloy 80 is an 80% nickel-iron-molybdenum alloy that provides very high initial and maximum magnetic permeabilities and minimal core losses at low field strengths. This vacuum-melted product also offers the advantages of small size and weight in magnetic core and shielding materials for numerous applications. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-223. Producer or source: Spang Industries Inc..

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