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Electricity pylons - electricity pylon wire at top

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eem2am

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electricity pylon wire at top

On pylons i see 13 conductors. What are these?

There are 3 pairs each side.
-and a single on top

The pairs are a phase alongside neutral?

They put 3 pairs each side of the pylon for balancing?

The top wire is a comms/monitoring wire?

(They have about 10 insulation disks so these are ~100KV pylons)
 

Electricity pylons

The top wire is an earth link. Lightning will strike it before the main HV cables, as it protects about a 30 degree arc under it for a short distance, like an umbrella.

The others are simply the 3 phases, doubled up as network capacity/demand increases. Steel core aluminum cable, three phases each side. Check to see if the insulators are the same size side to side, sometimes they run two different voltages to different substations on the same pylons.

Most distribution systems only run the 3 phases to the destination substation transformer where the primary is Delta wound - ie no required neutral.
 

Electricity pylons

right thanks trekkytekky

but for the sake of reducing loop inductance , they would surely put a phase and a neutral alongside each other to get the cancellation of the field?
 

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