Study on the Lightning Protection Performance for a 110 kV Non-Shield-Wired Overhead Line with Anti-Thunder and Anti-Icing Composite Insulators

Jianping Hu, Ting Zhu (), Jianlin Hu, Zhen Fang and Ruihe Zhang
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Jianping Hu: Disaster Prevention and Reduction Center of State Grid Hunan Electric Power Corporation, Changsha 410129, China
Ting Zhu: State Key Laboratory of Power Transmission Equipment & System Security and New Technology of Chongqing University, Chongqing 400044, China
Jianlin Hu: State Key Laboratory of Power Transmission Equipment & System Security and New Technology of Chongqing University, Chongqing 400044, China
Zhen Fang: Disaster Prevention and Reduction Center of State Grid Hunan Electric Power Corporation, Changsha 410129, China
Ruihe Zhang: State Key Laboratory of Power Transmission Equipment & System Security and New Technology of Chongqing University, Chongqing 400044, China

Energies, 2023, vol. 16, issue 2, 1-17

Abstract: Due to micro landforms and climate, the 110 kV transmission lines crossing the mountain areas are exposed to severe icing conditions for both their high voltage (HV) conductors and shield wires during the winter. Ice accumulation on the shield wire causes excessive sag, which leads to a reduced clearance between earth and HV wires, and could eventually result in tripping of the line due to phase-to-ground flashover. Due to the lack of effective de-icing techniques for the shield wires, removing them completely from the existing overhead line (OHL) structure becomes a reasonable solution to prevent icing accidents. Nevertheless, the risk of exposure to lightning strikes increased significantly after the shield wires were removed. In order to cope with this, the anti-thunder and anti-icing composite insulator (AACI) is installed on the OHLs. In this article, the 110 kV transmission line without shield wire is considered. The shielding failure after installation of the AACIs is studied using the lightning strike simulation models established in the ATP software. The lightning stroke flashover tests are carried out to examine the shielding failures on various designs for the AACIs. Assuming the tower’s earth resistance is 30 Ω, the LWL of back flashover and direct flashover are 630.88 kA and 261.33 kA, respectively, after the installation of AACIs on an unearthed OHL. Due to the unique mechanism of the AACI, the operational voltage level and the height of the pylon have a neglectable influence on its lightning withstand level (LWL). When the length of the parallel protective gap increases from 450 mm to 550 mm, the lightning trip-out rate decreases from 0.104 times/100 km·a to 0.014 times/100 km·a, and the drop rate reaches 86.5%. Therefore, increasing the gap distance for the AACI to provide additional clearance is proven to be an effective method to reduce the shielding failure rates for non-shield-wired OHLs.

Keywords: non-shield-wired overhead lines; anti-thunder and anti-icing composite insulator; lightning withstand level; shielding failure; parallel clearance; lightning trip rate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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