Partial discharge inception and extinction studies in polymer film structures impregnated with compressed SF/sub 6/ gas

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6072463

Reed, C W; Atkins, J M

New concepts for a gas insulated transformer include the following turn-to-turn structure for the transformer windings: sheet conductor (aluminum foil); polymer film insulation (Mylar film); and pressurized SF/sub 6/ gas (impregnating the structure). A previous study of this structure compared the 60 Hz discharge inception and breakdown performance of model windings using 0.0125 and 0.0233 mm thick polymer films. The present experimental investigation is part of a larger program evaluating the effect of different parameters (gas pressure, voltage waveform, conditioning effects, etc.) on the performance of this insulation system. Six-inch size models, featuring multiple samples wound concentrically, were tested. A new winding apparatus was designed and built specifically for the construction of these models. The test equipment, procedures, and results are discussed. The results showed that good consistency was achieved in the discharge and breakdown performance of 6-in. size coils wound on the specially-designed winding apparatus; normal probability plots indicate a single mode of breakdowns, partly determined by the quality of the conductor edge finish and partly by chance residual particles; the validity of using multiple-sample test coils was demonstrated; there has been no evidence for conditioning effects on discharge behavior in tests in air or SF/sub 6/ gas using coils constructed with precision slit aluminum; and discharge inception and extinction are affected by gas pressure in short-time tests, but breakdown is unaffected.

• Research Organization: General Electric Co., Schenectady, NY (USA). Research and Development Center
• DOE Contract Number: AC01-77ET29069
• OSTI ID: 6072463
• Report Number(s): CONF-811016-2; ON: DE81029140
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
AIR
BREAKDOWN
DATA
DIELECTRIC MATERIALS
ELECTRIC DISCHARGES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATION
ENERGY SYSTEMS
EQUIPMENT
EXPERIMENTAL DATA
FABRICATION
FILMS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
INFORMATION
MATERIALS
NUMERICAL DATA
PERFORMANCE TESTING
POLYMERS
POWER SYSTEMS
PRESSURE DEPENDENCE
SULFUR COMPOUNDS
SULFUR FLUORIDES
TESTING
TRANSFORMERS