Optimum design of core blocks and analyzing the fringing effect in shunt reactors with distributed gapped-core

Azzabi, Lotfi; Rahimpour, Ebrahim

doi:10.1016/j.epsr.2013.03.006

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…Magnetic flux density increases slightly with increasing air gap numbers. e inductance of the reactor decreases with the increase of the number of air gaps, on the premise that the magnetic flux density and the total length of air gap remain unchanged [18]. Here, the total length of air gap is reduced to maintain the inductance of the reactor at a constant level, when the number of air gaps increases.…”

Section: Discussion Of Uhv Shunt Reactor Core Vibrationmentioning

confidence: 99%

“…e total length of the air gap is adjusted so that the inductance values remain the constant. e calculation method of the reactor inductance is from the reference [18], and the corresponding relationship between the number of air gaps and the total length of the air gap is shown in Table 4. e other reactor parameters are as listed in Table 2.…”

Section: Influence Of Air Gap Number On Uhv Shunt Reactor Core Vibrationmentioning

confidence: 99%

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A New 3D Method for Reactor Core Vibration Based on Silicon Steel Lamination Rules and Application in UHV Shunt Reactors

Lü

Guo

Niu

et al. 2019

Mathematical Problems in Engineering

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A new three-dimensional (3D) analysis method is proposed as the existing two-dimensional (2D) method has low accuracy in analysing the vibration characteristics of oil-immersed shunt reactors, such as ultrahigh-voltage (UHV) shunt reactors. First of all, a set of 3D laminated coordinate systems was defined based on silicon steel lamination rules, in which the anisotropy of magnetic properties for laminated silicon steel in the rolling direction (RD), the transverse direction (TD), and the lamination direction (LD) were considered. Then, the mapping between laminated coordinate systems and space rectangular coordinate system was established to unify the parameters in different laminated coordinate systems. With the mapping, the anisotropy of the magnetic properties in the laminated coordinate systems was transformed into a rectangular coordinate system. Next, two sets of comparative studies between the new 3D method and the traditional 2D method were carried out, which show that the 3D method has high precision and a wide application range. Finally, the relationship between air gap number and core vibration of UHV shunt reactors was studied by the new 3D method. The results show that, as the number of air gaps increases, the magnetic flux density and the total force area of Maxwell force are increased, resulting in the intensification of core vibration. The conclusions of this paper are helpful for the design of large oil-immersed reactors.

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Section: Discussion Of Uhv Shunt Reactor Core Vibrationmentioning

confidence: 99%

Section: Influence Of Air Gap Number On Uhv Shunt Reactor Core Vibrationmentioning

confidence: 99%

A New 3D Method for Reactor Core Vibration Based on Silicon Steel Lamination Rules and Application in UHV Shunt Reactors

Lü

Guo

Niu

et al. 2019

Mathematical Problems in Engineering

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“…In cases where flux fringing effects in the air gap have a significant impact, the air gap length is distributed along the core leg to mitigate these effects [7].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Design of a Dry-Type Single Phase Gapped-Core Shunt Reactor to Empower National Industries

Zahedi,

Haidari

2023

CJMS

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The import dependency of essential components in our country's electrical power system poses a significant challenge, emphasizing the importance of focusing on the design, development, and maintenance of power system components, particularly shunt reactors, from an economic standpoint. Domestic production of these components contributes to employment opportunities and enhances self-sufficiency. This study aims to address these challenges by optimizing the design of a dry-type single phase gapped-core shunt reactor with a rating of 100 kVAr and 10 kV. The reactor operates at a frequency of 50 Hz and experiences a maximum core flux density of 1.2 T. The study thoroughly examines the fundamental aspects related to the design of gapped-core shunt reactors. An optimal design is achieved by determining the optimal ratio of the cross-sectional area to the height of each core disk, employing a MATLAB code to minimize the reactor's initial manufacturing cost (IC) or losses. In addition, the proposed design undergoes simulation and analysis using the finite element method (FEM) in the MAXWELL software. The reactor's inductance is obtained through both Maxwell three-dimensional (3D) simulation and analytical methods, demonstrating a reasonable agreement that validates the effectiveness and reliability of the proposed approach.

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“…Controllable shunt reactors placed on line terminals or substation bus bars play an important role in extra high‐/ultra high‐voltage (EHV/UHV) transmission networks of voltage control and reactive power compensation . With the advantages of continuously adjustable capacity, low harmonics, and excellent steady‐state control characteristics, magnetically controlled shunt reactors (MCSRs) are preferable for reactive power compensation in EHV/UHV power systems.…”

Section: Introductionmentioning

confidence: 99%

Modeling and impacts analysis of energization transient of EHV/UHV magnetically controlled shunt reactor

Zheng

Huang

Zhang

et al. 2017

Int. Trans. Electr. Energ. Syst.

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To address the problems of overvoltage, harmonic distortion, and mal-operation that can occur in protection systems as a result of direct energization in magnetically controlled shunt reactors (MCSRs), this paper proposes a novel approach for MCSR energization-namely, pre-excited energization. Using the structure and operating principles of an MCSR, a detailed derivation of energization transient mathematical model for both direct and pre-excited energization are presented and the model-specific impacts of the 2 different energization modes are investigated. To validate the theoretical analysis, we performed physical model tests and simulations of different energization modes. The results indicate that pre-excited energization is capable of suppressing overvoltage on the DC link bus and alleviating harmonics caused by direct energization. KEYWORDS energization, impacts analysis, magnetically controlled shunt reactor (MCSR), mathematical model, transient characteristics 1 | INTRODUCTIONControllable shunt reactors placed on line terminals or substation bus bars play an important role in extra high-/ultra high-voltage (EHV/UHV) transmission networks of voltage control and reactive power compensation. 1-3 With the advantages of continuously adjustable capacity, 4 low harmonics, 5 and excellent steady-state control characteristics, 6 magnetically controlled shunt reactors (MCSRs) are preferable for reactive power compensation in EHV/UHV power systems. Energization of power system components is accompanied by a switching transient, 7,8 and the energization transients of components such as transformers, 9-11 shunt capacitor banks, 12-14 and conventional shunt reactors 15 have been well documented. However, owing to their special body structures, MCSR energization transients are more complicated than those of conventional shunt reactors and transformers, and there has not been much research so far on the energization of MCSRs. 16 The simplest energization strategy for MCSRs at present is direct energization, in which the DC excitation system is blocked. As with transformer energization, one of the main problems associated with the MCSR direct energization transient is the occurrence of inrush current with a large number Symbols: _ U m , System bus voltage where MCSR is equipped; α, Phase angle of the system bus voltage at the instant of energization; U k , DC excitation source voltage; i 1 , Current of the grid-side winding; i k , Current of the control winding in the single phase MCSR; R 1 , Resistance of the grid-side winding; R k , Resistance of the control winding; R w , Balance resistor; N 1 , Number of turns in the grid-side winding; N 2 , Number of turns in the control winding; N 3 , Number of turns in the compensation winding; A, Area of the iron limb; l, Magnetic path length of the iron limb; i kA , Current of phase A in the control windings; i kB , Current of phase B in the control windings; i kC , Current of phase C in the control windings; i t , Total current of control windings; I dc , DC excitation current;...

show abstract

Optimum design of core blocks and analyzing the fringing effect in shunt reactors with distributed gapped-core

Cited by 14 publications

References 13 publications

A New 3D Method for Reactor Core Vibration Based on Silicon Steel Lamination Rules and Application in UHV Shunt Reactors

A New 3D Method for Reactor Core Vibration Based on Silicon Steel Lamination Rules and Application in UHV Shunt Reactors

Optimizing the Design of a Dry-Type Single Phase Gapped-Core Shunt Reactor to Empower National Industries

Modeling and impacts analysis of energization transient of EHV/UHV magnetically controlled shunt reactor

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