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Anonymous Poster #1

CT Saturation

09/24/2013 10:25 AM

I am testing ABB SAB-1 CT, 2.5L400, ratio 2000:5.

The ratio test result is good, with in 0.1% error, but when I tested for saturation the CT excitation knee point is about 200V. from the nameplate 2.5L400, I was expecting about 400V to saturate. am I missing something here?

appreciate your help
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lyn
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#1

Re: CT Saturation

09/24/2013 2:14 PM

Yes.
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67model
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#2

Re: CT Saturation

09/24/2013 5:43 PM

You will have to look at the ABB specification.

2.5L400 might mean 2.5% error at 400VA secondary load and 2000A primary.

I do not recall a standard which gives saturation voltage in a type code, but that does not prove much.
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bravo88
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#3

Re: CT Saturation

09/25/2013 8:41 AM

The spec is for under loaded condition, did you measure in loaded condition (loaded as spec) or open circuit. If measured open cct, it will saturate much earlier.

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RAMConsult
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#4
In reply to #3

Re: CT Saturation

09/25/2013 11:30 AM

Never test a CT with its secondary open circuited!! You must have a burden or a short on its terminals, otherwise you risk deadly voltages and/or destruction of the device.

Here's a good reference with pictures for you to follow.

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