Edp --> Isoladores Rígidos

[ManuFranciscoPT]

A EDP ainda distrubui postes com isoladores rígidos? (vidro ou de porcelana)
Qual a diferença entre isoladores rígidos de porcelana e isoladores rígidos de vidro?
Obrigado.

[sikiliki]

encontrei esta info:

http://www.electrical4u.com/electrical- ... insulator/
Advantages of Glass Insulator


It has very high dielectric strength compared to porcelain.

Its resistivity is also very high.

It has low coefficient of thermal expansion.

It has higher tensile strength compared to porcelain insulator.

As it is transparent in nature the is not heated up in sunlight as porcelain.

The impurities and air bubble can be easily detected inside the glass insulator body because of its transparency.

Glass has very long service life as because mechanical and electrical properties of glass do not be affected by ageing.

After all, glass is cheaper than porcelain.


Disadvantages of Glass Insulator


Moisture can easily condensed on glass surface and hence air dust will be deposited on the wed glass surface which will provide path to the leakage current of the system.

For higher voltage glass can not be cast in irregular shapes since due to irregular cooling internal cooling internal strains are caused.

[aureliocoimbra]

Se me é permitido, sugiro à administração que junte estes três tópicos, para evitar um pouco de "poluiçâo"

http://www.eletricidade.net/viewtopic.php?f=10&t=19756
http://www.eletricidade.net/viewtopic.php?f=10&t=19612
http://www.eletricidade.net/viewtopic.php?f=10&t=19653

[ManuFranciscoPT]

Se me é permitido, sugiro à administração que junte estes três tópicos, para evitar um pouco de "poluiçâo"

http://www.eletricidade.net/viewtopic.php?f=10&t=19756
http://www.eletricidade.net/viewtopic.php?f=10&t=19612
http://www.eletricidade.net/viewtopic.php?f=10&t=19653

Pelo menos tenho questões enquanto você só faz comentários de "lixo" mesmo.

Obrigado sikiliki