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Here are a few Photos of Transmission and Distribution Circuits / Poles, for US systems.
These are located in various areas of ECN:



This shows a Wood Pole, which is carrying (I think) is one 3 Phase 66KV Transmission circuit (on the left), one 3 Phase 34.5KV Distribution circuit (top right), and a possible 4160Y/2400 3 Phase 4 Wire Distribution circuit on the lower section (the Transformer is fed from this circuit).

Behind the Wood pole is a Transposition spot, for a two 3 Phase 138KV - 230KV Transmission circuits.

To the left of the Transpositions is a 138KV 3 Phase 2 ciruit Transmission structure.



Here is an oddity: This is an Open Wye Primary, Open Delta Vee 4 Wire Secondary Transformer configuration.
The Primary Distribution feeders appear to be a 13200Y/7620V 3 Phase 4 Wire Wye system.

The Secondary is one of the "Famous" 4 Wire Deltas - with the "High Leg".
Secondary Voltage is 240/120V, 3 Phase 4 Wire Delta. Measured Voltage from the secondary bushing on the far left side of the smaller Transformer, to the center tap of the larger Transformer, will equal something in the range of 195-208 Volts, while measuring Voltage between the center tap and either the left or right bushings of the Larger Transformer, will result in 120V, and all L-L measurements will show 240V.



Here is a 4 wire Wye secondary setup, with a delta primary arrangement.
Primary side voltage is in the 4KV range (looks like 4160).



Here are some wooden poles (tilting drammatically), with two 66KV 3 Phase Transmission circuits on the upper sections, and a few 12KV 3 Phase Distribution circuits on the lower sections.



Here is a shot of some Transformers fed from what appears to be a 7200 Volt 3 Phase circuit.



Another 12KV Distribution pole.

We have a lot of other pictures scattered around ECN, just search the Photos sections + the Electrical Theory sections.

Scott35