Simulation and Optimization on Electrodynamic Repulsion Force of Contact System in Circuit Breaker with Oil Dashpot

doi:10.16182/j.issn1004731x.joss.201806022

Abstract

Abstract: A 3D finite element model for contact system of circuit breaker with oil dashpot is established. Two electrodynamic repulsion forces, the Holm force between contacts and the Lorentz force between the conductor arms, are analyzed. The current density distribution, magnetic intensity distribution and the forces of the contact and contact arm are obtained. Compared with the theoretical value, it shows that it is feasible to use this method to solve electrodynamic repulsion force. The main factors that influence the Holm force are analyzed. The simulation results show the changes of Holm force with different surface contact coefficient, contact pressure and material hardness. The structure of the contact system is optimized through ANSYS. More electrodynamic repulsion force can be got in short-circuit condition, thus assisting circuit breaker with oil dashpot for breaking.

Key words: circuit breaker with oil dashpot, electro-magnetic coupling, Holm force, Lorentz force, optimal design

CLC Number:

TP391.9

Qiao Yanhua, Su Xiuping, Dong Tianying. Simulation and Optimization on Electrodynamic Repulsion Force of Contact System in Circuit Breaker with Oil Dashpot[J]. Journal of System Simulation, 2018, 30(6): 2175-2182.

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