This video documents an experimental observation of surface discharge (wet flashover) on a water‑covered insulator using the Revealer NEO25C color high‑speed camera. As a revealer high speed camera configuration for wet-flashover diagnostics, the system provides microsecond‑scale temporal resolution and full‑color plasma imaging, enabling direct assessment of discharge intensity via spectral color signatures.
The camera operated at 138,888 fps (~7 μs resolution) with intelligent optical triggering activated by the light rise at discharge inception. The insulator specimen, uniformly sprayed with deionized water, was subjected to a gradual voltage ramp in a controlled environment.
With arc initiation set as time zero, the key sequence is as follows: 0-7 μs – blue‑violet corona (low‑energy excitation); ~14 μs – bright pinkish‑white main arc breakdown (peak energy); 21-43 μs – transition to orange‑yellow, channel fragmentation and progressive extinction; ~100 μs – faint dark‑red glows, complete deionization.
The entire lifecycle lasts approximately 100 μs, with the main arc window under 10 μs. The color evolution (blue‑violet → pinkish‑white → orange‑yellow → dark red) provides a direct visual indicator of plasma state and discharge intensity, offering practical criteria for insulation degradation assessment and supporting wet‑flashover mechanism studies for grid protection design.
English
Deutsch
