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access icon free Research on lightning performance of AC/DC hybrid transmission lines on the same tower

  • Author(s): Shi Wei 1 ; Li Qingmin 2 ; Zou Liang 1 ; Zhang Li 1 ; Lu Xinchang 1
    • View affiliations
    • Affiliations: 1: School of Electrical Engineering, Shandong University, Jinan 250061, People's Republic of China;
      2: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, People's Republic of China
  • Source: Volume 7, Issue 2, February 2013, p. 166 – 174
    DOI:  10.1049/iet-gtd.2012.0308 , Print ISSN 1751-8687, Online ISSN 1751-8695
© The Institution of Engineering and Technology
Received 03/06/2012, Accepted 10/09/2012, Revised 04/09/2012, Published

Rapid expansion of power system and the limitation of transmission corridor resources have indispensably promoted the development of AC/DC hybrid transmission lines on the same tower under special situations, especially for ultra-high voltage systems being established in China. A hybrid tower model incorporating a double-circuit AC transmission and a bipolar DC transmission is proposed in the study. The lightning performance of AC/DC hybrid transmission lines is investigated based on electro-magnetic transient program (EMTP) and leader progression model, taking into account the operating voltage of transmission lines as well as the competition of multiple upward leaders. The impact of tower's height, footing resistance, arrangements of ground wires and ground obliquity on lightning protection performance is also analysed. In accordance with the ± 800 kV bipolar DC and the 500 kV double-circuit AC transmission lines on the same tower, the results show that the back flashover and the shielding failure is relatively serious for a 500 kV AC transmission line, which should be paid more attention to. Finally, several methods that may be used to improve lightning protection performance of the AC/DC hybrid transmission lines are presented, such as reducing the tower's height, using a negative protection angle and installing additional ground wires.

Inspec keywords: shielding; flashover; lightning protection; AC-DC power convertors; poles and towers; DC transmission networks; power transmission lines

Other keywords: ultra-high voltage systems; same tower; transmission corridor resources; tower height; AC/DC hybrid transmission lines; EMTP; hybrid tower model; back flashover; multiple upward leaders; leader progression; shielding failure; bipolar DC transmission; power system; lightning protection; ground obliquity; ground wires; China; double-circuit AC transmission lines; voltage 500 kV; footing resistance

Subjects: Power system protection; d.c. transmission; Power line supports, insulators and connectors; Power convertors and power supplies to apparatus

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