Measurement of stress grading conductivity to 1.6 MV/m and 155 oC Computation of grading power density and temperature rise for PWM waveforms

Author

Boggs, S.A. ; Kumada, A. ; Yoshimitsu, Tetsuo

Author_Institution

Inst. of Mater. Sci., Univ. of Connecticut, Storrs, CT, USA

fYear

2014

fDate

1-5 June 2014

Firstpage

54

Lastpage

56

Abstract

The move to PWM-based waveforms with substantial high frequency content results in much greater capacitive currents in the stress grading (SG) material and the conductive armor tape (CAT) which increase power dissipation and electric fields within these elements. Treating this subject numerically is challenging for several reasons, viz., (i) the need to measure SG nonlinear properties as a function of field to at least 1.5 kV/mm over the operating temperature range and (ii) the difficulty of computing steady state temperature rise in a stator bar which results from a continuous PWM waveform. This contribution presents solutions to both problems.

Keywords

cable sheathing; electrical conductivity measurement; pulse width modulation; stators; waveform analysis; CAT; SG nonlinear properties; capacitive currents; conductive armor tape; conductivity measurement; continuous PWM waveform; electric field effect; grading power density; operating temperature; power dissipation; stator bar; steady state temperature; stress grading materials; temperature 155 degC; Computational modeling; Current measurement; Dielectrics; Electrodes; Materials; Pulse width modulation; Temperature measurement; converter; corona protection; form wound coil; stator endturn; stress grading;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials (ISEIM), Proceedings of 2014 International Symposium on

Conference_Location

Niigata

Type

conf

DOI

10.1109/ISEIM.2014.6870718

Filename

6870718