Title :
Partial discharge based diagnostics for impurities in insulating fluid
Author :
Bolliger, D. ; Boggs, Steven
Author_Institution :
Electr. Insulation Res. Center, Univ. of Connecticut, Storrs, CT, USA
Abstract :
A novel test method for the condition assessment of dielectric fluids is proposed based on measurement of the fluid´s partial discharge (PD) characteristics in a needle-plane electrode geometry under AC field using a tungsten needle of 20 μm tip radius and a lowfield electrode blocked by a dielectric barrier. This system facilitates acquisition of partial discharge inception voltage (PDIV), streamer repetition rates, and phase resolved PD (PRPD) patterns without the risk of needle-damaging breakdowns. To demonstrate the approach, PD experiments were conducted on thermally and electrically aged hexadecane and on commercially available paraffinic and naphthenic base oils with typical field-aged concentrations of naturally occurring degradation products.
Keywords :
electrodes; insulating oils; partial discharges; AC field; PDIV; PRPD; condition assessment; dielectric barrier; dielectric fluids; hexadecane; lowfield electrode; naphthenic base oils; needle-plane electrode geometry; paraffinic; partial discharge inception voltage; phase resolved PD; size 20 mum; streamer repetition rates; tungsten needle; Aging; Degradation; Discharges (electric); Electrodes; Nitrogen; Partial discharges; Streamer; condition assessment; dielectric fluid; partial discharge; phase resolved PD pattern;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2013.6633696
