Bolts type used on overhead 22 kV & 66 kV lines

[SA07]

Good morning
What type of bolts is recommended for overhead bare aluminium cables 22 kV & 66 kV lines for a tropical country? galvanised, stainless steel, grade?

Is there a standard eg IEC or others for this?

In some areas, the atmosphere is more corrosive e.g. near the sea, a cooling tower. In these case, what is recommended?

Rgds

 

[waross]

On an island in the Gulf of Mexico we used standard hot dipped galvanized hardware.
I bigger issue than corrosion was flashover due to salt spray build-up.
Were possible use radial distribution from lines further onshore to feed loads near the sea rather than running line parallel and close to the sea.
Use a higher class of insulators.
For a 15 kV class system we used 25 kV class insulators.
Copper to aluminum connections:
For copper drops from transformers to aluminum lines the copper must be below the aluminum.
Rain water on copper causes salts that are corrosive to aluminum.
Salt spray makes it worse.
If the copper is below the aluminum there is no problem.
We had serious corrosion problems system wide until we learned this.
Changing the connections from copper above the aluminum to copper below the aluminum solved the issues.


Bill
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"Why not the best?"
Jimmy Carter