Characterization of Partial Discharges Initiated by Protrusion in HVDC Coaxial Geometry
Characterization of Partial Discharges
Initiated by Protrusion in HVDC Coaxial Geometry
This paper aims at the detection and characterization of partial discharges (PD) in GIS under HVDC constraints in the presence of a protrusion/metallic particle on the high voltage conductor. It is shown that the use of the IEC 60270 standard does not allow for the detection of PDs. For that purpose, a very accurate steady-state current measurement and a high frequency measurement of the current and emitted light associated with the PDs are performed. The results evidence a close correlation between the PD and the steady-state current and light emission. The transition between pulse and pulseless forms of corona discharges is also evidenced.