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. 2019 Aug 27;12(17):2751. doi: 10.3390/ma12172751

Figure 18.

Figure 18

Typical Schlieren images of the pre-breakdown disturbances between point-plane electrodes in pure transformer oil; (a) negative point: 60 kV and 2 µs pulse duration, (b) positive point: 45 kV and 2 µs pulse duration, (c) negative point: 45 kV and 9–6 µs pulse duration and (d) positive point: 45 kV and 2–7 µs pulse duration. Reproduced by permission of the Institution of Engineering & Technology [30].