Current Transformers Voltage Class?

[mbk2k3]

I have a reputable switchgear manufacturer that has provided 4.16kV switchgear lineups (multiple instances, different projects) where the current transformers supplied are rated for 600V.

For example the CT103 from Arman here:

http://www.chesselectric.ca/wp-content/uploads/2015/07/CT103.pdf

What does the voltage / insulation level for a CT imply? Can a 600V CT be used in a 4.16kV application?

 

[davidbeach]

Sure, because it is not coming in contact with energized parts.

 

[mbk2k3]

Thanks David.

I had a hunch 600V insulation for CTs comes into play if the window/round type CTs have bare busbar or bare copper cables going through them.
Since in my application there is typically insulated busbar/insulated cables, 600V are widely used in 4.16kV applications.

Thanks for confirming.

 

[scottf]

The voltage class of the CT is 600V, which means that the 4160V conductor must be insulated. For MV switchgear, these type CTs are normally placed around the breaker bushing which provides the insulation. Other installs could have enough space in air to provide the insulation or the conductor itself could be insulated.

It's quite common to use to 600V class CTs in switchgear up to 38kV.