Conductive and ferromagnetic screening of 50Hz magnetic fields from a three-phase system of busbars

Salinas, Ener

doi:10.1016/s0304-8853(00)01003-9

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…The calculation of eddy currents in multiconductor systems or busbars is very important for designers [11,[26][27][28]. This second example is related to the calculation of the induced transient current in the shield of a three-phase busbar.…”

Section: Multiconductor Busbar Systemmentioning

confidence: 99%

Enhanced Time-stepping FEM Simulation using Digital Signal Processing

Dadić

2008

SIMULATION

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The purpose of this paper is to present a novel approach in time-domain simulations based on the time-stepping finite element method (FEM). The method uses a single time-stepping FEM simulation to determine the unit step response of the system. On the basis of this response, a digital filter with transfer function equal to that of the target system is designed. This allows excitation to be varied without need for the field analysis to be performed again. Such an approach can give substantial speed-up in electromagnetic or structural simulation. The proposed approach was validated in the simulation of a pulsed eddy-current inspection system and in the simulation of the eddy currents induced in the shield of a busbar system.

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Section: Multiconductor Busbar Systemmentioning

confidence: 99%

Enhanced Time-stepping FEM Simulation using Digital Signal Processing

Dadić

2008

SIMULATION

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“…The spacing between the bars is made equal to their thickness for practical reasons, and this leads to skin and proximity effects. The bus ducts usually consist of aluminum or copper busbars encapsulated in a rectangular aluminum enclosure (shield), which serves for protection against mechanical stress and fire, and reduces magnetic field outside the busbars, thereby protecting electrical and electronic equipment and people's health [1][2][3][4][5][6][7]. A typical cross-section of the non-segregated three-phase highcurrent air-insulated bus duct is depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…In other types of rectangular busbars, analytical-numerical and numerical methods must be applied [1,4,6,14,17,18,[31][32][33][34][35][36][37][38][39][40]. These impedances can also be determined by experimental methods [41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

“…These impedances can also be determined by experimental methods [41][42][43][44]. According to [9], the capacitances in the three-phase high-current bus duct systems are below 20 nF/m, and at the industrial frequency f = 50 Hz they are usually neglected [1][2][3][4][6][7][8][9][10][11]. We also neglect them, because for the bus ducts considered in this paper we found the approximate values of capacitances to be about 20 pF/m (using FEMM).…”

Section: Introductionmentioning

confidence: 99%

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Numerical Method of Computing Impedances in Shielded and Unshielded Three-Phase Rectangular Busbar Systems

Piątek¹,

Baron²,

Jabłoński³

et al. 2013

PIER B

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Abstract-In this paper, a new numerical method of calculating rectangular busbar impedance is proposed. This method is based on integral equation method and partial inductance theory. In particular, impedances of shielded and unshielded three-phase systems with rectangular phase and neutral busbars, conductive enclosure, and use of the method are described. Results for resistances and reactances for these systems of multiple rectangular conductors have been obtained, and skin and proximity effects have also been taken into consideration. The impact of the enclosure on impedances is also presented. Finally, two applications to three-phase shielded and unshielded systems busbars are described. The validation of the proposed method is carried out through FEM and laboratory measurements, and a reasonable level of accuracy is demonstrated.

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