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access icon openaccess Shockwave phenomena in an inhibited gas-to-liquid hydrocarbon transformer oil under lightning impulse voltages

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 21/08/2018, Accepted 17/09/2018, Published 01/10/2018

Gas-to-liquid (GTL) transformer oil is increasingly considered as an alternative to conventional mineral oils, due to its consistent performance, high purity and essentially free of sulphur. This high interest has led to growing research attention on streamer and breakdown performance of GTL oil. A large effort has been made to characterise the streamer phenomena of GTL oil. However, the secondary effect of shockwaves, which are produced synchronously with the propagation of streamers, is not well studied. Shockwave phenomena in a GTL oil under standard lightning impulse voltages were studied using a 10 mm point-plane gap and the Schlieren photograph technology. Shockwave propagation velocity and shape were measured in order to quantitatively describe the pressure profiles inside the streamer channels.

Inspec keywords: transformer oil; shock waves; lightning; discharges (electric); schlieren systems

Other keywords: streamer phenomena; shockwave propagation velocity; breakdown performance; GTL oil; inhibited gas-to-liquid hydrocarbon transformer oil; streamer channels; pressure profiles; shockwave phenomena; gas-to-liquid transformer oil; point-plane gap; standard lightning impulse voltages; Schlieren photograph technology

Subjects: Dielectric breakdown and discharges; Transformers and reactors; Organic insulation

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