Open AccessComparative analysis of breakdown spectra registered using optical spectrometry technique in biodegradable ester liquids and mineral oil
Author(s) -
Rozga Pawel,
Tabaka Przemyslaw
Publication year - 2018
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2017.0229
Subject(s) - mineral oil , molecule , spectral line , analytical chemistry (journal) , dissociation (chemistry) , excitation , chemistry , dielectric , dielectric strength , hydrogen , ionization , emission spectrum , fragmentation (computing) , materials science , chemical physics , organic chemistry , optoelectronics , ion , physics , astronomy , electrical engineering , engineering , computer science , operating system
This study presents the results of optical spectrometry based measurements performed in three commercial dielectric liquids: synthetic ester, natural ester, and mineral oil. The optical spectra collected concern the breakdown initiated by standard lightning impulse voltage of positive polarity in a point‐plane electrode system. The obtained results showed the differences between the spectra. The relationships between emission from atomic hydrogen (656.3 nm) and continuum concerning the wavelengths between 380 and 600 nm attributed to dissociation and fragmentation of molecules and recombination of molecular fragments were assessed as different for the distinctive liquids tested. The emission from atomic hydrogen was dominant in the case of mineral oil, however, for natural ester and first of all for synthetic ester, the light from the mentioned continuum had the highest intensity. Thus, this may be supposed that the differences in the spectra resulting from the different proportions of the physical processes responsible for the breakdown in a given liquid. It seems that in ester liquids the way for direct excitation and ionisation of liquid molecules is easier, so easier rotational and vibrational types of excitation of the high number density main molecules may take place giving a reflection in the optical spectra registered.