Particle-initiated breakdown in gas dielectric cable insulation expanded scope program. Final report
The adverse influence of conducting particle contaminants in gas-insulated power apparatus was investigated in a series of experiments that employed coaxial configurations and dc voltages to 1500 kV. Particle dynamics was shown to be important and related to breakdown initiation in the gas. Both SF/sub 6/ and N/sub 2/ gases at pressures from 1 to 14.6 atm absolute were used. The particles were intentionally introduced and ranged from 1.6 to 6.4 mm spheres and wires. Effects in the gas gap as well as along surfaces of solid insulators were studied. Visual observations, photographs, and electrical measurements helped in distinguishing various processes. Particles could reduce the insulation performance by factors of 3 to 5 and were especially significant when moved to the center conductor. By coordination of this work with a separate study at the Westinghouse R and D laboratory, a comparison between dc and ac performance was made. Generally the dc breakdown values exhibited wider scatter, though their lower limit was similar to that found under ac. Overall fundamental forces and processes which involve particle contamination effects were identified and found to be the same for dc and ac voltage stresses.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). High Voltage Research Lab.
- DOE Contract Number:
- EX-76-C-01-1556
- OSTI ID:
- 5513493
- Report Number(s):
- EPRI-EL-1264
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GAS-INSULATED CABLES
BREAKDOWN
UHV DC SYSTEMS
ALUMINIUM
COAXIAL CABLES
COMPARATIVE EVALUATIONS
DIELECTRIC MATERIALS
ELECTRICAL INSULATION
EXPERIMENTAL DATA
GRAPHS
NITROGEN
PARTICLES
POWER TRANSMISSION LINES
PRESSURE DEPENDENCE
SULFUR FLUORIDES
UNDERGROUND POWER TRANSMISSION
CABLES
CONDUCTOR DEVICES
CRYOGENIC FLUIDS
DATA
DATA FORMS
DC SYSTEMS
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
MATERIALS
METALS
NONMETALS
NUMERICAL DATA
POWER SYSTEMS
POWER TRANSMISSION
SULFUR COMPOUNDS
200302* - Power Transmission & Distribution- DC Systems- (1989-)