Spectral Analysis of Light Emitted by Streamers and Gas Chromatography in Liquid Dielectrics

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Abstract
Spectral analysis of the light emitted by streamers during their propagation in liquid dielectrics reveals the presence of the Hα line and C2 Swan bands as well as a continuum which corresponds to dissociation and fragmentation of liquid molecules and recombination of molecular fragments. Spectra of the emitted light vary according to polarity and streamer velocities. The more energetic the streamer, that is, the faster it is, the higher the characteristic lines emerging from the continuum. The above results confirm those obtained by gas chromatography conducted in a blend of mono- and dibenzyltoluene (M/DBT) and phenylxylylethane (PXE). Indeed, the latter shows the presence of decomposition products such as H2, CH4, C2H2, C2H4 and C2H6. However, hydrogen and acetylene are predominant. These gases may result from vaporization for slow bushlike streamers, whereas for fast filamentary ones the dominant mechanisms may be dissociation and ionization in the liquid phase.

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