Backflashover Performance Evaluation of the Partially Grounded Scheme of Overhead Lines with fully Composite Pylons

Hanchi Zhang, Qian Wang, Filipe Miguel Faria da Silva, Claus Leth Bak, Kai Yin, Henrik Skouboe

Research output: Contribution to journalJournal articleResearchpeer-review

4 Citations (Scopus)
59 Downloads (Pure)

Abstract

A design of a fully composite pylon has been proposed for new-generation 400 kV transmission towers to save line corridors and to reduce visual impact. Correspondingly, a method of external down-leads is proposed to bring grounding potential to the shield wires, together with a plan that not all pylons are grounded called partially grounded transmission lines (PGTLs). This paper investigates backflashover performance of a partial grounding scheme of overhead lines (OHLs) supported by composite pylons. The transient analysis was carried out in PSCAD based on Monte Carlo method. For OHLs with every pylon grounded, reducing footing resistance and soil resistivity can improve backflashover performance effectively, but for PGTLs, these two methods do not have obvious effect and increasing insulation distance has limited effect. When lightning strikes at PGTLs, overvoltage is mainly dependent on the distance to the nearest grounded pylon and a longer distance will cause overvoltage with larger amplitude and longer wave front duration. Therefore, backflashover rate also increases along with the distance to the nearest grounded pylon until reaching a value limited by the inceptive condition of flashover. A coefficient recommended by CIGRE TB 63 to estimate backflashover rate is discussed and modified when using in PGTLs.

Original languageEnglish
JournalIEEE Transactions on Power Delivery
Volume37
Issue number2
Pages (from-to)823-832
Number of pages10
ISSN0885-8977
DOIs
Publication statusPublished - 1 Apr 2022

Bibliographical note

Publisher Copyright:
IEEE

Keywords

  • backflashover rate
  • Flashover
  • fully composite pylon
  • Grounding
  • grounding
  • Lightning
  • lightning overvoltage
  • Mathematical model
  • OHLs
  • partially grounded
  • Poles and towers
  • Voltage control
  • Wires

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