current transformer

'CT saturation' and 'CT accuracy limit factor' are different things.

For 1600/1A, 5P20 CT, the number 20 is called the 'accuracy limit factor' which means the CT composite error will remain within 5% with 20 x 1600 A = 32 kA primary current. With more than 32 kA, the error limit will be more than 5% but actual saturation may occur higher than 32 kA and the CT class designation (5P20) doesn't have the saturation limit information. The saturation current can be obtained from CT excitation curve.

And off course, the CT burden must be within the CT VA rating. As 'Electronaut' mentioned the CT saturation may occur less than 32 kA if the burden exceeds the rated VA.

See also

http://cr4.globalspec.com/thread/43440

https://w3.energy.siemens.com/cms/00000032/aune/Documents/EA/08_CT%20Dimensioning.pdf

- MS