Mathematical model of the arc erosion in bimetallic electrical contacts

Kharin, Stanislav; Nouri, Hassan; Miedzinski, Bogdan

Abstract

The mathematical model describing the nonstationary temperature field in a bimetallic contact consisting of a basic material and a covering is presented. It is based on the axially symmetric heat equation with the boundary conditions including an arc heat flux entering the covering surface and the ideal heat contact on the interface between covering and the basic material. The arc heat flux consists of the several components relating to the heating due to the electron and ion bombardment, arc radiation, inverse electrons, and cooling due to the electron emission, melting and evaporation. The dynamics of all these components is calculated for the brass contacts with the AgCdO covering. It is found that the transition from the metallic arc phase to the gaseous arc phase occurs due to dynamical redistribution of the arc heat components. The resulting temperature fields in the basic contact and the covering enable us to choose the parameters for the optimal thickness of covering.

• Presentation Conference Type: Conference Paper (unpublished)
• Conference Name: 28th International Conference on Electric Contacts
• Start Date: Jun 6, 2016
• End Date: Jun 9, 2016
• Acceptance Date: Mar 15, 2016
• Publication Date: Jan 1, 2016
• Deposit Date: Jun 15, 2016
• Publicly Available Date: Jun 15, 2016
• Peer Reviewed: Peer Reviewed
• Keywords: electrical contacts, surface coating, arc erosion, mathematical model
• Public URL: https://uwe-repository.worktribe.com/output/920488
• Publisher URL: http://www.contacts2016.com
• Additional Information: Title of Conference or Conference Proceedings : 28th International Conference on Electric Contacts
• Contract Date: Jun 15, 2016