Effect of Vapour Force at the Blow-Open Process in Double-Break Contacts

Kharin, S.N.; Nouri, Hassan; Bizjak, M.

doi:10.1109/tcapt.2009.2013986

Cited by 11 publications

(2 citation statements)

References 13 publications

(26 reference statements)

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“…The contact blow-open process is a complex one, dependent on the pre-open phenomena [25] and on electrodynamic forces [15,22,26,27]. The current thrusts of research are the effects of blow-open contact bounce on contact welding and the phenomena behind it [4,5,13,26].…”

Section: Resultsmentioning

confidence: 99%

Electrodynamic Contact Bounce Induced by Fault Current in Low-Voltage Relays

et al. 2019

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Due to fault currents occurring in electrical installations, high electromagnetic force values may be induced in current paths of low-voltage electromagnetic relays. This force may lead to an electromagnetic bounce that will further result in an electric arc ignition between contacts, and under some circumstances, it will result in contact welding. For the proper exploitation of relays, the threshold value of the maximum current, and thus the electrodynamic force, should be known. This force depends on several factors, including: contact materials, dimensions of relay current paths, relay electromagnetic coil, etc. This paper presents the results of calculations and an experiment on electromagnetic forces, which cover these factors. A static closing force, acting on the contacts, and the fault current were measured. As a result, values of the force and current threshold were obtained, which inform when an electrodynamic bounce may occur. The obtained result may be used in designing contact rivets and relay current paths together with the selection of adequate fault protection devices.

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Section: Resultsmentioning

confidence: 99%

Electrodynamic Contact Bounce Induced by Fault Current in Low-Voltage Relays

et al. 2019

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“…A similar kind of integral equation arises in solving the boundary value problems of heat conduction with heat generation, which describe the development of the one-dimensional unsteady heat processes with axial symmetry. More complex equations arise from the model that is based on the system of spherical heat equations in a domain with moving boundary and when studying the Stefan problem [20][21][22][23].…”

Section: Reducing the Equation (1) To A Differential Equation In Imagesmentioning

confidence: 99%

On a pseudo-Volterra nonhomogeneous integral equation

Kosmakova¹,

Akhmanova²,

Tuleutaeva³

et al. 2019

Bul. Kar. Univ. - Math.

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In this paper the issues of the solvability of a pseudo-Volterra nonhomogeneous integral equation of the second kind are studied. The solution to the corresponding homogeneous equation and the classes of the uniqueness of the solution are found in [1]. By replacing the right-hand side and the unknown function, the integral equation is reduced to an integral equation, the kernel of which is not compressible. Using the Laplace transform, the obtained equation is reduced to an ordinary first-order differential equation (linear). Its solution is found. By using the solution of the homogeneous equation the form of a particular solution of the nonhomogeneous differential equation is defined (by the variation method of an arbitrary constant). By using the inverse Laplace transform, a particular solution of the pseudo-Volterra nonhomogeneous integral equation under study is obtained. The case of an nonhomogeneous integral equation with the value of the parameter k = 1 is considered and studied. Classes for the right side and the solution of the integral equation are indicated.

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