Use of composite insulators in SF{sub 6} switchgears

Book · Wed Nov 01 04:00:00 EST 1995

OSTI ID:122774

Bessede, J L; Martin, J ^[1]

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1. GEC ALSTHOM T and D S.A., Villeurbanne (France)

In switchgear, composite insulators are exposed to specific conditions: switching of electrical arc, permanent current, mechanical operations, dielectric gradients, etc. Then, these insulators must withstand electro-dynamic forces, electrical arc radiation, temperature, decomposed SF{sub 6}, or ambient pollution. Different kinds of technologies are available for these hollow insulators, that may behave differently. Tests were performed on glass/epoxy samples. They gave information on the ability of composite or bonding agents to withstand temperature or decomposed SF{sub 6}. Then 72.5 kV silicone rubber shedded insulators were submitted to pressure, bending, aging, leak tests, partial discharge tests, salt fog and pollution flashover tests, etc. The results demonstrated that attention must be given to the degradation of the composite tube under deflexion, and to the tightness of the composite insulator before and after mechanical tests. At the end, tests on open type 72.5 kV switchgear were performed. The mechanical and leak tests, switching and internal fault tests gave good results.

• OSTI ID: 122774
• Report Number(s): CONF-950521--; ISBN 1-56676-313-4
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
36 MATERIALS SCIENCE
COMPILED DATA
COMPOSITE MATERIALS
DECOMPOSITION
ELASTICITY
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
ELONGATION
EPOXIDES
FIBERGLASS
FLEXURAL STRENGTH
GAS-INSULATED SUBSTATIONS
HYDROFLUORIC ACID
MATERIALS TESTING
MECHANICAL TESTS
PERFORMANCE TESTING
STRESS CORROSION
SULFUR FLUORIDES