Title :
On the character of different forms of partial discharge and their related terminologies
Author :
Bartnikas, R. ; Novak, J.P.
Author_Institution :
Inst. de Recherche d´´Hydro-Quebec, Varennes, Que., Canada
fDate :
12/1/1993 12:00:00 AM
Abstract :
Experimentally obtained partial discharge pulse forms are compared with those derived theoretically, using a mathematical model of a short gap. The calculations indicate that, with overvolted short gaps, the apparent absence of the protracted ion current tail in the overall pulse form is due to the large excess of the electron current component generated by strongly enhanced cathode emission by the photoeffect and other phenomena. Under conditions of high overvoltage the ion-impact-induced emission, the ion fluxes and, consequently, the ion current component are greatly reduced as compared to the electron current. The long ion current tail, representing not more than a few percent of the total current, passes undetected. Pulseless and pseudo-glow discharges are considered. Preferred terms to designate the different forms of partial discharges are suggested
Keywords :
electron density; fault currents; glow discharges; ion density; overvoltage; partial discharges; photoemission; space charge; PD pulses; cathode emission; discharge pulse forms; electron current component; high overvoltage; ion current component; ion current tail; ion flux; ion-impact-induced emission; mathematical model; overvolted short gaps; partial discharge; photoeffect; pseudoglow discharges; pulseless discharges; Electron emission; Fault location; Partial discharges; Pulse circuits; Pulse shaping methods; Shape; Space vector pulse width modulation; Tail; Terminology; Voltage control;
Journal_Title :
Electrical Insulation, IEEE Transactions on