Title :
The effect of high current density and uneven current distribution on a current collection system
Author :
Chow, Tommy W S ; Bishop, Herby W.
Author_Institution :
Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon, Hong Kong
fDate :
9/1/1991 12:00:00 AM
Abstract :
The complex relationship between current density, flash temperature, contact voltage drop, brush wear, and brush hardness is discussed. The flash temperature is estimated for a wide range of current densities and the effect of brush softening at high temperature is included in the analysis. Experimental results obtained from two screening rigs provided strong evidence that a nonlinear current distribution occurred on a current collection system. How the flash temperature and the current collector performance are affected by the effect of such a nonhomogeneous current distribution are discussed
Keywords :
brushes; wear; brush hardness; brush softening at high temperature; brush wear; complex relationship; contact voltage drop; current collection system; effect; effect of high current density; flash temperature; nonhomogeneous current distribution; nonlinear current distribution; uneven current distribution; Brushes; Contacts; Copper alloys; Current density; Current distribution; Degradation; Electric resistance; Equations; Superconducting films; Temperature distribution;
Journal_Title :
Components, Hybrids, and Manufacturing Technology, IEEE Transactions on
