Substation question

[OldBroadcastTech]

I pass this facility often, and have noticed that on one of the incoming transmission lines, two of the three conductors have what looks (from the highway) like a huge air-core coil..........only two, not all three.

Can someone provide an explanation ?

Picture attached, you can see the coils just to the right of center.

Thanks !

 

[Hv&Lv]

Google "wave trap"
It's meant to filter out the high frequency power line carrier communications. The signal dissipates quickly when it goes through the windings of a substation transformer.

 

[OldBroadcastTech]

Would that communications also be the reason I see coils of what looks like coaxial cable on transmission line towers every 1/4 mile or so, about 40 ft off the ground ?

Never realized it could be that

 

[Hv&Lv]

It's OPGW fiber
(Optical Ground Wire)