Potential distribution on the stress grading system of high-voltage rotating machines ???I measuring system

Author

Kumada, Akiko ; Nakamura, Takahiro ; Hidaka, Kunihiko ; Tsuboi, Yuichi ; Yoshimitsu, Tetsuo

Author_Institution

Dept. of Electr. Eng. & Inf. Syst., Univ. of Tokyo, Tokyo, Japan

Volume

22

Issue

6

fYear

2015

fDate

12/1/2015 12:00:00 AM

Firstpage

3163

Lastpage

3169

Abstract

A surface potential measuring system has been developed utilizing a Pockels sensor to measure the potential distribution of the stress grading (SG) system of form wound motor coils. A Pockels BGO crystal is positioned just above (<;1 mm) the SG, and the capacitively-induced voltage on the surface of the BGO crystal adjacent to the SG is measured by using Pockels effect of the BGO crystal. The sensing system is applicable to surface potential measurement over wide frequency region from 0.001 Hz to 100 MHz. The spatial resolution of the measuring system after enhancement through deconvolution is discussed with the result that the -3 dB spatial frequency of the measuring system is 0.22 cycle/mm which implies a resolution in the range of 4 mm.

Keywords

Pockels effect; electric machines; machine insulation; measurement systems; sensors; surface potential; Pockels BGO crystal; Pockels effect; Pockels sensor; SG system; capacitively-induced voltage; frequency 0.001 Hz to 100 MHz; high-voltage rotating machines; stress grading system; surface potential measuring system; wound motor coils; Crystals; Dielectric measurement; Electric potential; Optical surface waves; Stator cores; Surface waves; Pockels sensor; Tikhonov???s regularization; end turn grading;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2015.005581

Filename

7367509