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Glass insulators, due to the thermal treatment received, offer great resistance to both the mechanical stress which is normal for suspension insulators, as well as accidental impacts which may occur during transport, handling and installation. They are also highly resistant to sudden changes in temperature.

Advantages:

Gass insulators offer a very important advantage: the insulator is either intact or shattered. There is no chance to have internal cracks or electrical punctures. If the glass were to break for any reason, it would break up into small pieces, whilst the mechanical resistance of the insulator “stub” remains practically the same as that of the intact insulator.

This makes power line inspection work easier because it can be done using the naked eye, from the ground or from a helicopter. Thus, the insulator string practically maintains its original mechanical properties until maintenance work can be done to replace the insulator.