Natural ageing of EPDM composite insulators

Journal Article · Sun Dec 31 23:00:00 EST 1989 · IEEE (Institute of Electrical and Electronics Engineers) Transactions on Power Delivery; (USA)

DOI:https://doi.org/10.1109/61.107305· OSTI ID:5095626

Vlastos, A E; Sherif, E ^[1]

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1. Chalmers Univ. of Technology, High Voltage Engineering, S-412 96 Gothenburg (SW)

Long-rod composite insulators, with weather sheds (sheds) made of ethylene propylene rubbers (EPDM), were exposed for many years to HVAC and HVDC under realistic conditions and natural pollution. The change of their properties with time and their aging was studied. The results show that the insulator shed material undergoes a slow degradation process and loses successively its water repelling properties which initially make the EPDM composite insulators superior to inorganic glass and porcelain insulator. The outdoor degradation of the shed material depends on the electric stress, in the environmental factors (such as pollution, rain, salt-laden fog, and UV-radiation from sun) and on the materials and fillers used in the construction of the composite insulators. A thorough macro- and microscopic study of the EPDM composite insulator sheds illustrates the differences of the surface state of EPDM insulators of different makes in which different basic material compositions and fillers are used. The poor performance of aged EPDM composite insulators compared to inorganic insulators depends on the design and on environmental factors.

• OSTI ID: 5095626
• Journal Information: IEEE (Institute of Electrical and Electronics Engineers) Transactions on Power Delivery; (USA), Journal Name: IEEE (Institute of Electrical and Electronics Engineers) Transactions on Power Delivery; (USA) Vol. 5:1; ISSN 0885-8977; ISSN ITPDE
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240201 -- Power System Networks
Transmission & Distribution-- AC Systems-- (1990-)
36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
AC SYSTEMS
COMPOSITE MATERIALS
DC SYSTEMS
DESIGN
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
ENERGY SYSTEMS
ENVIRONMENTAL IMPACTS
EQUIPMENT
ETHYLENE PROPYLENE DIENE POLYMERS
HVAC SYSTEMS
HVDC SYSTEMS
MATERIALS
MATERIALS TESTING
MICROSCOPY
PERFORMANCE TESTING
PHYSICAL PROPERTIES
POLYMERS
POWER SYSTEMS
SERVICE LIFE
TESTING