Current Transformer

Can you supply more information please as your question is a little unclear?

Are you aware of the difference between a voltage transformer and a current transformer?

CT's still have to have voltage ratings...

Bushings use CT's, not VT's...the VT is inside the can.

The manufacturer will rate the bushing to the need, i.e., if the CT is only rated at 600V, the the bushing would have a similar rating.

Why would the bushing be rated any higher? What would the need be? The CT only needs the bushing to be rated at its limit, right?

Would you put 250 MPH rated tires on a minivan? No, the minivan would never reach that speed (under normal circumstances) so you put appropriately rated tires on it.

If you need a CT of a higher rating, then have the supplier make the bushing suited for the task under the same contract.

Many times components will be found suitable for work at higher ratings than what they are sold/rated for. The money there could be traced to the work needed to certify a component for a non-standard application.

$$$

The bushing has to be rated for the line voltage.

The current transformer only has to be rated for low voltage. The current transformer is not normally connected to the line.

Current transformers are operated at very low voltage. The current transformer output is normally nearly shorted. (probably under 10 volt)

The current transformer turns ratio is designed to obtain the correct load corrent. The load on the current transformer has to have low enough resistance so that the output voltage is low. (usually under 10 volt)

Hi, is this voltage when you magnetise your CT from the secondary side

Greetings

M & L