Mathematical models of heat and mass transfer in electrical contacts

Kharin, S.N.

doi:10.1109/holm.2015.7354949

Cited by 16 publications

(8 citation statements)

References 15 publications

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“…The marked voltage jumps of more than 10 V seen at t = 122 and 126 µs in figure 2(b) are evidence of the rupture of the molten bridge at each contact pair. Irrespective of the exact process at the origin of this rupture (large contact separation or magnetic pinch forces [8]), it results in a dense metal vapor with a pressure on the order of 100 bar [9]. The voltage between the contact is high enough to ionize atoms in this vapor [10], allowing current to flow.…”

Section: Resultsmentioning

confidence: 99%

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From the molten bridge rupture to the local thermal equilibrium arc: optical emission spectroscopy of electric arcs during contacts opening

Corfdir

Delachaux

Sütterlin

et al. 2020

J. Phys. D: Appl. Phys.

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We investigate by time-resolved optical emission spectroscopy the properties of electric arcs forming at the opening of Cu contacts and with a current of a few kA. The systematic observation of well-resolved transitions demonstrates that the dense Cu vapor that results from the rupture of the molten metal bridge between the contacts expands rapidly. Solving the radiative transfer equation through the line-of-sight to fit the lineshape of the detected spectra, we obtain that both the pressure and the temperature of the Cu-dominated plasma increase during the first 100 µs of arcing. At the same time, the peak wavelength and broadening of Cu I transitions exhibit a non-monotonic time-dependence. In particular, both the blueshift and narrowing of these transitions by Stark effect during the first 40 µs of arcing demonstrate a decrease in electron temperature. This result leads us to the conclusion that it takes at least 40 µs for the arc to be at local thermal equilibrium after the rupture of the molten metal bridge.

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Section: Resultsmentioning

confidence: 99%

“…Irrespective of the exact process at the origin of the rupture (e.g. boiling, magnetic pinch, etc [7,8]), a nonequilibrium highpressure (on the order of 100 bar) metal vapor is formed [9]. This vapor then expands [9], metal atoms that it contains are ionized [10], arc roots are established, and electrode erosion takes place.…”

Section: Introductionmentioning

confidence: 99%

From the molten bridge rupture to the local thermal equilibrium arc: optical emission spectroscopy of electric arcs during contacts opening

Corfdir

Delachaux

Sütterlin

et al. 2020

J. Phys. D: Appl. Phys.

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“…j (k−m−p) ! α (0) j 1 α (0) j 2 ...α (k−m−p) (0) j k−m−p = qWλτ + 2qβ (τ) (n) τ=0 , Convergence of series (17), (18) can be proved similarly like in the papers [4,5].…”

Section: Problem Solutionmentioning

confidence: 87%

Mathematical model of heat transfer in opening electrical contacts with tunnel effect

Sarsengeldin

Kharin

Rayev

et al. 2018

Filomat

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“…Zhang et al 11 calculated the electric contact heat flow and applied it to the contact surface of the model and subsequently used ANSYS finite element software to analyze the transient temperature field change during the armature electric contact process. Kharin et al 12 established a mathematical model of heat transfer in electrical contact and detailed arc erosion.…”

Section: Introductionmentioning

confidence: 99%

Simulation of electrical contact wear on the rough surfaces of ultra-high-voltage transmission line fittings

Yang,

Li,

Wang

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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A novel electrical contact wear simulation method was proposed to characterize the electrical contact wear of fittings in ultra-high-voltage transmission lines by combining line fittings with the Archard wear model and oxidation loss theory. In this method, a three-dimensional (3D) rough body was generated by using the Weierstrass–Mandelbrot fractal function to simulate the contact surface. An electrical contact wear subroutine was developed, and the wear state was updated using arbitrary Lagrangian–Eulerian adaptive grid technology. Finally, finite element software was used to perform thermal stress wear coupled analysis. The results show that the wear volume, wear depth and friction temperature obtained by the rough electric contact model were 2.71 times, 4.21 times and 2.18 times of the common ideal plane model, respectively. In the rough model, the wear depth of the nodes initially accelerated, subsequently slowed down, and again accelerated with time. The friction high temperature region was distributed in a point pattern, and the temperature difference between the contact region and the non-contact region became obvious.

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Mathematical models of heat and mass transfer in electrical contacts

Cited by 16 publications

References 15 publications

From the molten bridge rupture to the local thermal equilibrium arc: optical emission spectroscopy of electric arcs during contacts opening

From the molten bridge rupture to the local thermal equilibrium arc: optical emission spectroscopy of electric arcs during contacts opening

Mathematical model of heat transfer in opening electrical contacts with tunnel effect

Simulation of electrical contact wear on the rough surfaces of ultra-high-voltage transmission line fittings

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