Abstract
This paper presents systematic research on the lightning performance of a novel Y-shaped composite pylon for 400 kV transmission lines and the feasibility of empirical formulas for this kind of tower when considering the effect of tower-footing impedance. The transient overvoltage response to a lightning surge at the tip of the pylon is modeled in PSCAD/EMTDC. Compared with the Donau tower, the composite pylon shows a similar backflash rate (BFR) level. Then, we use qualitative analysis based on lumped parameter model and distributed parameter model to predict the critical flashover current (Ic) of the composite pylon. We find that the calculated results exhibit higher error deflection when the existing empirical formulas are applied in the Y-shaped pylon. Furthermore, the simulated lightning performance has a lower sensitivity to varied tower-footing impedance compared with empirical formula calculation. The special structure of the Y-shaped pylon, the discontinuity in surge impedance and the soil ionization are analyzed to account for the role of tower-footing impedance on lightning performance. Finally, we improve the accuracy of the empirical formulas to the Y-shaped pylon lightning performance and discuss the effect of the footing impedance on the BFR.
Original language | English |
---|---|
Title of host publication | 35th International Conference on Lightning Protection – ICLP - SIPDA 2021 |
Number of pages | 6 |
Publication date | 2021 |
Pages | 1-6 |
ISBN (Print) | 978-1-6654-2347-2 |
ISBN (Electronic) | 978-1-6654-2346-5 |
DOIs | |
Publication status | Published - 2021 |
Event | International Conference on Lightning Protection (ICLP) and “International Symposium on Lightning Protection” (SIPDA) - Colombo, Sri Lanka Duration: 20 Sept 2021 → 26 Sept 2021 https://iclp2020.org/ |
Conference
Conference | International Conference on Lightning Protection (ICLP) and “International Symposium on Lightning Protection” (SIPDA) |
---|---|
Country/Territory | Sri Lanka |
City | Colombo |
Period | 20/09/2021 → 26/09/2021 |
Internet address |
Keywords
- BFR
- empirical formula
- tower-footing impedance
- composite pylon
- surge impedance