Title :
The effect of aromatic and sulfur compounds on partial discharge characteristics of hexadecane
Author :
Bolliger, D. ; Pilania, G. ; Boggs, Steven
Author_Institution :
Electr. Insulation Res. Center, Univ. of Connecticut, Storrs, CT, USA
Abstract :
Partial discharge (PD) characteristics of hexadecane were studied in a needle-plane electrode geometry under AC field with a 20 μm tip radius tungsten needle. PD experiments were conducted on samples containing known concentrations of aromatic and corrosive sulfur compounds. Partial discharge inception voltage (PDIV), streamer repetition rates, and phase resolved PD (PRPD) patterns were acquired. Ionization potentials (IP) and electron affinities (EA) of hexadecane and the additives were calculated with density functional theory (DFT) and correlated with the PD characteristics. Low IP and negative EA of the additives relative to hexadecane increased the number of positive and negative streamers initiated, except for additives that contained an electron donating group on the aromatic ring. Low IP and positive EA for polyaromatic hydrocarbons (PAH) and corrosive sulfur compounds decreased the number of negative streamers initiated due to large electron capture cross sections. Copper sulfide particulates caused the greatest changes in PD characteristics as a result of its semi-conductive nature.
Keywords :
organic insulating materials; partial discharges; sulphur compounds; tungsten; AC field; W; and electron affinities; aromatic compound; aromatic ring; copper sulfide particulate; corrosive sulfur compound; density functional theory; electron donating group; hexadecane partial discharge characteristics; ionization potential; needle-plane electrode geometry; partial discharge inception voltage; phase resolved partial discharge pattern; polyaromatic hydrocarbon; size 20 mum; streamer repetition rate; Additives; Compounds; Copper; Dielectrics; Fluids; IP networks; Partial discharges; Streamer; additives; corrosive sulfur; density functional theory; dielectric fluid; electron affinity; ionization potential; partial discharge; phase resolved PD pattern;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2013.6518950
