Accession Number:

ADA190109

Title:

Theoretical Model of the Cathode Spot on a Unipolar Arc.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1987-12-01

Pagination or Media Count:

99.0

Abstract:

A theoretical study and computer analysis of the cathode spot of a unipolar arc was conducted. The underlying theories of plasma physics, space charge effects, and electron emission needed for an understanding of cathode phenomena are presented. Two models of unipolar arcing are reviewed and an analysis of the cathode spot is begun. A stationary model of the cathode spot is formulated with a system of equations that is not closed. A method of solution. using the Steenbeck Minimum Principle, is used and a computer program developed to determine the cathode spot parameters. Results of the analysis are presented for arc currents of 100, 150, 175, 200, 300, and 400 Amperes. It is found that for copper stable arcs occur only for arc currents greater than 200 Amperes. Keywords Electric arcs, Unipolar arcing.

Subject Categories:

  • Electricity and Magnetism
  • Electrical and Electronic Equipment
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE