Simulations as Verification Tool for Design and Performance Evaluation of Switchgears

Kriegel, Martin; Uzelac, Nenad

doi:10.1007/978-3-319-72538-3_12

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…Therefore, it is essential to define a model description as much as possible on the data flow and information, which is the case of the MHD simulation where a mathematical model that stands on such a solid basis will have a high probability of being applied, and so tested and improved, in a continuous way [67]. That is the reason for the vast utilization of the MHD tools for the design and performance evaluation of switchgear [68]. Four groups of equations used in this study are the current conservation equations Ampere's law and Lorentz force, HT, and Navier-Stokes equations (NSEs) for an incompressible fluid, including conservation of momentum and mass.…”

Section: Solidsmentioning

confidence: 99%

Effects of Fast Elongation on Switching Arcs Characteristics in Fast Air Switches

Kadivar

Niayesh

2020

Energies

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This paper is devoted to investigating the effects of high-speed elongation of arcs inside ultra-fast switches (ucontact≈ 5–80 m/s), through a 2-D time-dependent model, in Cartesian coordinates. Two air arcs in series, one between a stationary anode and a moving cathode and the other between a stationary cathode and a moving anode in the arc chamber, are considered. A variable speed experimental setup through a Thomson drive actuator is designed to support this study. A computational fluid dynamics (CFD) equations system is solved for fluid velocity, pressure, temperature, and electric potential, as well as the magnetic vector potential. Electron emission mechanisms on the contact surface and induced current density due to magnetic field changes are also considered to describe the arc root formation, arc bending, lengthening, and calculating the arc current density, as well as the contact temperatures, in a better way. Data processing techniques are utilized to derive instantaneous core shape and profiles of the arc to investigate thermo-electrical characteristics during the elongation progress. The results are compared with another experimentally verified magnetohydrodynamics model of a fixed-length, free-burning arc in the air. The simulation and experimental results confirm each other.

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Section: Solidsmentioning

confidence: 99%

Effects of Fast Elongation on Switching Arcs Characteristics in Fast Air Switches

Kadivar

Niayesh

2020

Energies

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“…A contact is a part of the current circuit in which the current flow is made possible by the conjunction of two conductors. Due to their function in the current circuit, a distinction can be made between connecting and nonconnecting contacts [22]. Connecting contacts consist of movable and fixed elements, while nonconnecting contacts are only made of fixed elements.…”

Section: Non-connecting and Connecting Contactsmentioning

confidence: 99%

Mechanical and Electrical Simulations of the Tulip Contact System

Łapczyński

Szulborski

Gołota³

et al. 2020

Energies

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The purpose of this work is to discuss the tulip contact behavior during mechanical and electrical simulations in a Finite Element Method (FEM) environment using ANSYS and COMSOL software. During the simulations, the full contact movement was analyzed. During the contact movement, the individual behavior of the contact components was taken into consideration. The motion simulation was carried out at different velocities and forces acting on the contact. The obtained results were compared to each other and discussed. Relatively, the angles of the contact surfaces to each other were also changed, which meant that we could conduct a more in-depth analysis. The other approach of simulation research was a field analysis of physical phenomena occurring in the tulip contact. This analysis was performed in COMSOL Multiphysics. Parametric analysis allowed an observation of the electric field in the tulip contact at different contact distances with respect to each other. This work is important in terms of the cost effectiveness for design procedures concerning tulip contacts and fault avoidance, which both result from mechanical and electrical conditions throughout contact exploitation and optimization of the working conditions for the tulip contact.

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“…A contact is a part of the current circuit in which the current flow is made possible by the conjunction of two conductors. Due to their function in the current circuit, a distinction can be made between connecting and non-connecting contacts [22]. Connecting contacts consist of movable and fixed elements, while nonconnecting contacts are only made of fixed elements.…”

Section: Contacts In Electrical Apparatuses and Current Circuits Non-connecting And Connecting Contactsmentioning

confidence: 99%

Mechanical and Electrical Simulations of the Tulip Contact System

Łapczyński¹,

Szulborski²,

Gołota³

et al. 2020

Advances in Energy Research

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Simulations as Verification Tool for Design and Performance Evaluation of Switchgears

Cited by 4 publications

References 6 publications

Effects of Fast Elongation on Switching Arcs Characteristics in Fast Air Switches

Effects of Fast Elongation on Switching Arcs Characteristics in Fast Air Switches

Mechanical and Electrical Simulations of the Tulip Contact System

Mechanical and Electrical Simulations of the Tulip Contact System

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