Parts of 110KV Current Transformer

https://www.google.com/search?ie=UTF-8&q=primary+on+110kv+transformers&sa=Search#q=primary+on+110kv+transformer

link of that like a search for these has pictures and further explainations ---

about:

"cables that come from the left of the picture seem"

- "seems" difficult to compare "thin" to something relevant to the purpose of those cables, objectively; however varily, if what is pictured is very well insulated and well positioned as high voltage conductors, I think you will find such can carry many kv within a use of some required conductor surface-to-cross-sectional area for some designed current flow for a working-result of some VA (k-, or mega- wattage, so to say)

for example, and with fluids- though avatar shows "thin" looking "cables" of piping of really 3/4" tubing (pic bottom of a 12 ft deep pond of 180ft wide x 80ft x 12)

it "flows" enough to adequately heat ~95% of the peak loading of "work" required in energy transfer to heat 7200 sq ft of a home with "work" flowing on a chilled fluid side to the pond, in the winter, such that it supports a "rated-size 7+" GeoThermal (water-source) Heat Pump in -5f below zero or lower ambient conditions.

The velocity - and pressure with the amount of fluid flow "works" very well with those "thin" ... "conductors".

It's a matter of viewing perspective, those "thin" cables are probably 3/4 inch thick when viewed up close, something that you don't want to do with a 110KV line. That particular installation is a traction substation, a system where the loading varies widely, something that allows a thinner than expected bare conductor to be more than adequate.

In one study the 110KV phase current went from 90A to 270A over a 4 minute period as a train passed by the pair of 15MVA transformers feeding the overhead conductor at that point. A bare 4/0 copper conductor (diameter = 0.4600 inches) can easily carry that current for short periods without serious overheating (about 90°C max.), especially hanging in free air.

The current transformer in the diagram is Live Tank Outdoor CT suitable for overhead line type switchyard - hence no cable.

The bare conductor connected to the terminals at either end of Live Tank is 110kV conductor suitable for maximum current at 110kV 3 Phase power system.

Hi,

you're right, "cable" was not the correct term.

Thanks all for your answers!