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Open AccessArticle

A Non-Uniform Transmission Line Model of the ±1100 kV UHV Tower

1
State Grid Corporation of China, Beijing 100000, China
2
Department of Electrical Engineering, Zhejiang University, Hangzhou 310058, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(3), 445; https://doi.org/10.3390/en12030445
Received: 30 December 2018 / Revised: 28 January 2019 / Accepted: 28 January 2019 / Published: 30 January 2019
(This article belongs to the Special Issue DC and AC Overhead Transmission Lines from Low to Extra-High Voltages)
The modeling of the Ultra-High Voltage (UHV) tower plays an important role in lightning protection analysis of transmission lines because the model used will directly affect the reliability of the results. Moreover, the higher the voltage level is, the more prominent the impact becomes. This paper first analyzes the inapplicability of the Hara multi-segment multi-surge impedance model for the ±1100 kV UHV towers, and then builds a non-uniform transmission line model of the tower. Secondly, the multi-segment multi-surge impedance model is used to study the influence of the tower’s spatial structure changes on its electromagnetic transient characteristics. It is concluded that the more accurately the nominal height of the tower is modeled, the more accurately its electromagnetic transient response is reflected. Finally, the lightning electromagnetic transient responses of the tower with the non-uniform transmission line model and with the multi-segment multi-surge impedance model are compared and analyzed, which shows that the non-uniform transmission line model is more in line with the actual situation under the lightning strikes. View Full-Text
Keywords: ±1100 kV Ultra-High Voltage (UHV) tower; multi-surge impedance model; non-uniform transmission line model; lightning protection analysis; tower electromagnetic transient response ±1100 kV Ultra-High Voltage (UHV) tower; multi-surge impedance model; non-uniform transmission line model; lightning protection analysis; tower electromagnetic transient response
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Guo, X.; Fu, Y.; Yu, J.; Xu, Z. A Non-Uniform Transmission Line Model of the ±1100 kV UHV Tower. Energies 2019, 12, 445.

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