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Anonymous Poster #1

Multi Purpose Instrument Transformers Info

10/18/2023 1:00 PM

Is there multipurpose CT that would have both protection class and measuring class, CT as one combination unit, that can be installed in 15kv switchgear window type? Also the metering class has to be approved by Industry Canada. (ANSI c57.13). Could you comment, if you know a manufacturer name and part number? Thank you.

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#1

Re: MULTI PURPOSE INSTRUMENT TRANSFORMERS

10/18/2023 1:44 PM
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#2
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Re: MULTI PURPOSE INSTRUMENT TRANSFORMERS

10/18/2023 4:15 PM

Thank you !!

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#3

Re: Multi Purpose Instrument Transformers Info

10/18/2023 4:31 PM
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#4
In reply to #3

Re: Multi Purpose Instrument Transformers Info

10/19/2023 11:11 AM

That’s a very impressive development, providing both voltage & current measurements in one small package, but the design is unlike a typical window CT provided for in switchgear up to 35kV. It may be difficult to adapt mechanically to the equipment. Also, if used for revenue metering, the serving utility probably needs to be consulted, even with IEC assurances.

Certainly worth checking out...

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#5

Re: Multi Purpose Instrument Transformers Info

10/20/2023 4:48 AM

Sure. Just get onto a manufacturer stating the voltage insulation, number of windings, ratio and class of protection. I have installed them from 11KV up to 275KV and with up to 8 windings having ratios with secondary currents of 5amp and 1 amp,

The manufacturer will know the requirements and standards to meet for your part of the world.

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Anonymous Poster #1
#6

Re: Multi Purpose Instrument Transformers Info

10/27/2023 11:10 AM

This is the answer to the question:

The design of this CTs has 1 core and 1 winding. In the context of ANSI/IEEE standards, a CT with only one winding can be designed to work for both measuring and protection purposes. For measuring, the CT operates in the linear region of its magnetization curve; accuracy is guaranteed under normal operation conditions up to the Rating Factor value. For protection, the CTs operates in the saturation region of the curve; when a fault, the current exceeds the CT’s saturation level and protective relays operate when detecting this change.

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