Green gas for a grid as an eco-friendly alternative insulation gas to SF 6 : From the perspective of partial discharge under AC

Abstract

This paper deals with the characteristics of partial discharge (PD) in green gas for a grid (g3), which is thought to be a promising eco-friendly alternative to substitute SF 6 used in electrical power facilities and to reduce the greenhouse effect. g3 gas with 4% NOVECTM 4710/96% CO 2 was used and electrode systems including a protrusion on conductor (POC) and a protrusion on enclosure (POE) were fabricated to simulate PD in a gas-insulated structure. PD characteristics in terms of partial discharge inception voltage (PDIV), pulse parameters in time and frequency, and the phase-resolved partial discharge (PRPD) pattern in SF 6 and g3 were compared. From the results, the PDIVs of g3 were 76%-81% of that of SF 6 in the POC and were 78%-84% of that of SF 6 in the POE, depending on the gas pressure. Rising time, pulse width, and relative amplitude in the frequency domain of PD pulses in g3 gas were greater than those in SF 6 . In addition, the PRPD patterns indicated that both the average apparent charge and pulse count of PD in g3 were higher compared with those in SF 6 . The results from this paper are expected to provide fundamental material for the green manufacturing of gas-insulated power apparatus.