Impulse breakdown in SF/sub 6/, SF/sub 6//N/sub 2/ and SF/sub 6//N/sub 2//perfluorocarbon mixtures

Conference · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5640816

Fatheddin, A; Pace, M O; Christophorou, L G; Pai, R Y

The impulse breakdown strengths of binary mixtures of SF/sub 6//N/sub 2/, SF/sub 6//PFC (perfluorocarbon), PFC/N/sub 2/, and ternary mixtures of SF/sub 6//PFC/N/sub 2/ have been measured for nonuniform field point-plane geometry. Both standard lightning (1.2 ..mu..s rise/50 ..mu..s decay) and switching (200 ..mu..s rise/2000 ..mu..s decay) waveforms of positive and negative polarity were employed. The gap distance was kept constant at 22.2 mm and the pressure was varied from 0.05 to 0.5 MPa. For negative polarity, addition of an electron-attaching PFC to SF/sub 6/ or SF/sub 6//N/sub 2/ increases the V/sub 50/ (peak voltage with 50% breakdown probability) values for both lightning and switching waveform. For positive polarity, addition of PFC to SF/sub 6/ or SF/sub 6//N/sub 2/ reduces the V/sub 50/ values for the lightning waveform, but it increases the V/sub 50/ values for pressures less than or equal to 0.3 MPa for switching surge waveforms. These delicate effects are related to space charges and the resultant changes in the size and position of the corona stabilization peak. The effect of changes in the point electrode configuration with sparking, on the V/sub 50/ vs pressure function was investigated also and the results are reported.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5640816
• Report Number(s): CONF-820331-4; ON: DE82008847
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
BINARY MIXTURES
BREAKDOWN
CABLES
CONDUCTOR DEVICES
CORONA DISCHARGES
DATA
DIELECTRIC MATERIALS
DISPERSIONS
ELECTRIC CABLES
ELECTRIC DISCHARGES
ELECTRICAL EQUIPMENT
ELEMENTS
ENERGY SYSTEMS
EQUIPMENT
EXPERIMENTAL DATA
FLUIDS
FLUORIDES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE COMPOUNDS
GAS-INSULATED CABLES
GAS-INSULATED SUBSTATIONS
GAS-INSULATED TRANSFORMERS
GASES
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
LIGHTNING
MATERIALS
MIXTURES
NITROGEN
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OVERVOLTAGE
POWER SUBSTATIONS
POWER SYSTEMS
SULFUR COMPOUNDS
SULFUR FLUORIDES
TRANSFORMERS