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Power line quiz
Roger Bryant
296 Posts
Who can guess the purpose of the 2 wire OHL on the far left?

7 Replies
Rob Eagle
149 Posts
Pilot wires?
Zoomup
2736 Posts
Eagle perches.
Zoomup
2736 Posts
Ski lift.
mapj1
3421 Posts
Assuming a sensible size pole those insulators suggest 6 or 11kV.  Could be a 2 wire HV feed, or DC I suppose.
Mike.
Grounding purposes?
I'm seeing three wires, but only two insulators - nothing on the top/apex.

No reason why 3-phase has to have 3 wires each insulated from earth.
Clive
 
Roger Bryant
296 Posts
The answer is in these 4 wire pylons. 


For historic reasons germanic land railways use 15 kV single phase at 16 2/3 Hz and have their own power stations and grid. The first picture was a single phase, probably 25kV line going to a mast mounted transformer somewhere.

The picture above is part of the SBB 132kV grid.



 

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