In Pakistan currently we are facing black outs in many areas due to false tripping of relays caused by flash overs due to severe foggy weather in the areas. Your kind suggestions are most welcome.
If the fog is affecting the relays, then they should be put into a sealed dry container or room.
If the fog is affecting the 500 V overhead lines, then you have a bigger problem easily solved by using underground cables rather than overhead lines. But that would be very expensive.
Another possible solution would be to have a greater distance between the individual overhead lines so that the arcing is less likely to happen.
I think that here in the UK, we automatically reconnect after a line drops out for the first time. You need to have timer to prevent a second re-connection in the case of a genuine shorting.
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