TRENCH IOSK 362 SR Current Transformer 1

[NAZ55]

Does any one have any photos or pictures of internal guts of a TRENCH CT?

I am just trying to get an idea on how this CT actualy looks internally

Thanks

 

[dpc]

Looks like a chunk of iron with a bunch of wire wrapped around it.

 

[scottf]

I assumed you looked at the brochure on the Trench web site?

It is an oil-paper insulated CT.

What specifically do you want to know about the insides?

 

[NAZ55]

I am looking at one of their Nameplate drawing and it shows primary with 4 rectangles and the winding past one of them is connected to the case.
Also, the secondary seems to show one long rectangle with a line above it and it didn't make sense to me.

The drawing is copyrighted or else I would have posted it.

 

[scottf]

up to you, but i would think posting a nameplate drawing of one of your units should be perfectly ok.

I can probably explain it to you if you choose to post it.

 

[NAZ55]

Here's my rough sketch of the nameplate in microsoft paint

 

[scottf]

That is a 4 turn primary winding. Each box represents a primary conductor. It shows them all in series, therefore, a 4-turn primary winding. The connection shown between the 1st and 2nd conductor is the potential connection to the head-housing, which is at line potential.

On the secondary schematic, the line above means that it's an iron-core, as opposed to an air-core, i.e. something like a rogowski coil.

 

[NAZ55]

Thanks scottf.

So if my CT ratio is 200:5 does it mean that I have 160 turns in the secondary?

How are these 4 primary conductors laid out? Are they twisted together? or is it representing one conductor wraped 4 times around the core?

 

[scottf]

Yes...you would have 160 turns on the secondary.

I'm not sure of the specifics on this design, but I assume that the conductors are aluminum 'rods', i.e. solid conductors. They would be laid out in a manner where they could be connected in series via return conductors (most likely outside conductors and the head housing) wrapping around the head.

They are not twisted, but rather for 4 independent turns around the head connected in series.

 

[NAZ55]

Thank you Sir!