Partial Discharge measurement is a very important
means of assessing the integrity of insulation systems in a High
Voltage apparatus. In compressed gas insulation systems, floating
particles can initiate partial discharge activities which adversely
affect the working of insulation. Partial Discharges below the
inception voltage also plays a crucial in damaging the integrity of
insulation over a period of time. This paper discusses the effect of
loose and fixed Copper and Nichrome wire particles on the PD
characteristics in SF6-N2 (10:90) gas mixtures at a pressure of
0.4MPa. The Partial Discharge statistical parameters and their
correlation to the observed results are discussed.
 Mason, J. H., "Discharges", Electrical Insulations., IEEE Trans., Vol. 13,
1978, pp 211-238
 Devins J. C., "The Physics of Partial Discharges in Solid Dielectrics",
Electrical Insulations, IEEE Trans., Vol. 19, 1984, pp 475-495
 Bartinkas. R., "A Commentary on Partial discharge Measurement and
Detection", Electrical Insulations, IEEE Trans., Vol. 22, 1987, pp 629-
 Michael G. Danikas and Despoina Pitsa, "Detection and Registration of
Partial Discharge Events below the so called Inception Voltage : The
case of small air gaps", Journal of Electrical Engineering, Vol. 59, No. 3,
2008, pp 160-164.
 Bruning A. M., Kasture D.G., Campbell F. J., Turner N. H., "Effect of
Cavity Sub-Corona on Polymer Insulation Life, Electrical Insulations.,
IEEE Trans., Vol. 26., 1991, pp 826-836.
 Danikas M. G. and Prionistis F. K., "Detection and Recording of partial
Discharges below the so called Inception Voltage", Facta Universitatis.,
Vol. 17, 2004, pp 99-1110.