A multiconductor transmission line model for surge propagation studies in large a.c. machine windings

Author

Keerthipala, Wickramaarachchige W L ; McLaren, Peter G.

Author_Institution

Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada

fYear

1990

fDate

12-14 Aug 1990

Firstpage

629

Abstract

An analytical model (a frequency-dependent transients program) was developed to predict turn and interturn voltages across the line-end coil under steep-fronted surge conditions. The results of simulation for laminated and solid slot cases showed a close agreement with the corresponding experimental results. This investigation shows the error in replacing the laminated slot core by a solid slot core in the study of steep-fronted surge propagation in large a.c. motor coils. For the laminated slot case, the peak interturn voltages are greater (by a factor of about 1.5) than those for the solid slot model for the coil used in this study. The steeper the surge front impinged, the greater the peak interturn voltages

Keywords

AC motors; laminations; machine insulation; machine theory; machine windings; surges; transients; transmission line theory; HV motors; analytical model; experimental results; frequency-dependent transients program; laminated slot core; laminations effect; large a.c. motor coils; lightning surges; line-end coil; multiconductor transmission line model; peak interturn voltages; solid slot core; steep-fronted surge conditions; steep-fronted surge propagation; surge propagation studies; switching surges; turn voltages; Coils; Dielectrics and electrical insulation; EMTP; Lamination; Machine windings; Multiconductor transmission lines; Optical propagation; Solid modeling; Surges; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1990., Proceedings of the 33rd Midwest Symposium on

Conference_Location

Calgary, Alta.

Print_ISBN

0-7803-0081-5

Type

conf

DOI

10.1109/MWSCAS.1990.140797

Filename

140797