Design of grading ring structure for high altitude ultra-high voltage transformers

Before putting into operation, ultra-high voltage transformers need to undergo strict handover tests to ensure their safe and reliable operation. The grading capacity of the grading ring on the transformer will affect the accuracy of the handover test. When there are problems with high altitude envi...

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Bibliographic Details
Published in电力工程技术 Vol. 43; no. 5; pp. 216 - 223
Main Authors LIAO Wenlong, DING Lijie, ZHU Tianyu, HUANG Zhiwen, ZHANG Yu, WEI Wenfu
Format Journal Article
LanguageChinese
Published Editorial Department of Electric Power Engineering Technology 01.09.2024
Subjects
corona discharge
electric field distribution
grading ring
high altitude
roughness problem
transformer
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Summary:Before putting into operation, ultra-high voltage transformers need to undergo strict handover tests to ensure their safe and reliable operation. The grading capacity of the grading ring on the transformer will affect the accuracy of the handover test. When there are problems with high altitude environments or grading ring structures, their grading ability will change. It is particularly important to study and design grading rings that can have good grading ability in different situations. This article first uses COMSOL software to build a three-dimensional model of the withstand voltage test circuit of a 500 kV transformer. Secondly, the influence of changes in the pipe diameter and ring spacing of the equalizing ring on the equalizing capacity of the equalizing ring is studied. Finally, the variation of equalizing capacity of the equalizing ring in a rough state is studied. It is found that as the diameter of the equalizing pipe and the ring diameter increase or the distance between the rings decreases, the
ISSN:2096-3203
DOI:10.12158/j.2096-3203.2024.05.022