@inbook{8fef45cd32c340b2ac353c3f3978a30b,
title = "Mach-cone Shaped Shockwave Characteristics of Gas-to-Liquids Transformer Oil under Positive Lightning Impulse",
abstract = "Investigating shockwave characteristics of insulating liquids is helpful for understanding the streamer characteristics since shockwave phenomenon is closely related to the streamer propagation. In recent years, a Gas-to-Liquids (GTL) based transformer oil has been increasingly used in large power transformers. However, there is no study to quantitatively investigate the dynamic propagation characteristics of Mach-cone shaped shockwave in GTL oil. This paper presents an experimental study focusing on the spatial distribution of Mach-cone shaped shockwave in GTL oil obtained with a laser Schlieren system. The needle-plane electrode geometry was used with the applied voltage increased from 21.0 kV to 32.5 kV under positive lightning impulse. The Mach-cone shaped shockwaves were observed after the streamer initiation in GTL oil and then they dissipated quickly. The instantaneous streamer velocity deduced from Mach cone angle in GTL oil tends to stabilise towards 1.5 km/s.",
author = "Haichuan Yu and Qiang Liu and Zhongdong Wang and Andree Hilker and Attila Gyore",
year = "2021",
doi = "10.1109/CEIDP50766.2021.9705466",
language = "English",
isbn = "9781665419079",
series = "Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP",
publisher = "IEEE",
pages = "486--489",
booktitle = "Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP",
address = "United States",
}