1. General lens characteristics

1.1 The right material for the right application

The characteristics of glass used in electrical engineering vary according to the application, whether it's molded glass or glass fiber. Generally speaking, the electrical properties of glass are of secondary importance (glass, by its very nature, has insulating properties), and it is above all the chemical and, initially, mechanical properties that are decisive.

In the case of molded parts, there are two main families, differentiated by the mechanical strength of the glass. Some parts that do not require high mechanical strength are molded and annealed. The mechanical limits of the material when annealed have led glass insulator manufacturers to develop and adapt the tempering process (more common in flat glass)...

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General lens characteristics

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page Glass for electrical insulation

Application to overhead line insulators

Bibliography

(1) - ZARZYCKI (J.) - Les verres et l'état vitreux. - Masson (1982).
(2) - RIVIERE (D.) - Le verre trempé et son utilisation pour l'isolement des lignes aériennes à haute tension. - RGE, n° 5 (mai 1966).
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Events

CIGRE International Council on Large Electric Systems, sessions held every two years in Paris (even-numbered years) http://www.cigre.org

JEC Composites Show held every year in Paris http://www.jeccomposites.com

Standards and norms

International Electrotechnical Commission

Insulators for overhead lines with nominal voltage above 1,000 V – Part 1: Ceramic or glass insulator elements for AC systems – Definitions, test methods and acceptance criteria - CEI 60383-1 - 1993
Insulators for overhead lines with nominal voltage above 1,000 V – Part 2: Isolator chains and equipped isolator chains for AC systems - CEI 60383-2...