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Characteristics of Secondary Arc Current on UHV DC and EHV AC Transmission Lines Erected on the Same Tower

Authors
  • XIE, Yadi
  • HE, Baina
  • WANG, Lemiao
  • JIANG, Renzhuo
  • ZHOU, Yuyang
  • MAO, Yazhe
Type
Published Article
Journal
International Journal of Emerging Electric Power Systems
Publisher
De Gruyter
Publication Date
Oct 17, 2019
Volume
20
Issue
5
Identifiers
DOI: 10.1515/ijeeps-2019-0095
Source
De Gruyter
Keywords
License
Yellow

Abstract

With the continuous expansion of the scale of power system, corridor resources of overhead transmission lines tend to be saturated in China, making AC/DC erection on the same tower a trend in future development. The AC/DC coupling effect will cause DC line to generate secondary arc current at the point of failure when transmission line fails, which affects the DC restart. On account of the mechanism of generating secondary arc current by AC/DC lines erected on the same tower, this paper uses PSCAD to establish simulation model for AC/DC erected on the same tower. And the effects of different fault locations, lengths of coupling sections, and different transposition modes of AC lines on the secondary arc current and recovery voltage of AC and DC lines are studied. The results show that secondary arc current on DC line is greatly affected by fault location and length of coupling line, and using different transposition modes of AC lines can reduce secondary arc current on the DC lines effectively. According to Yunguang UHV DC restart time sequence, setting the restart time sequence can increase the first restart deionization time to ensure the stable operation of the system.

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