Why does the ALF in a current transformer increase with less load on the secondary side?

Asked Dec 15 '22 at 10:09

Active Dec 15 '22 at 17:28

Viewed 69 times

I am studying measuring transformers and I recently came across an expression that implies that the accuracy limit factor (ALF) of a protection class TI increases when the secondary load decreases (less impedance).

I am trying to understand this, since the ALF is correlated with the current at which the TI reaches magnetic core saturation, and the saturation in a transformer is correlated with the primary voltage and frequency applied to it. Then the load on the secondary side shouldn't impact (at least much) the resulting magnetic flux on the transformer. Can you help me with this?

edited Dec 15 '22 at 17:28

JYelton

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asked Dec 15 '22 at 10:09

João Marques

Alien Life Form? – winny Dec 15 '22 at 12:32
Accuracy limit factor (ALF) – João Marques Dec 15 '22 at 13:47
Texas Instruments? – Tyler Dec 15 '22 at 15:55
Current transformer, sorry i put it in another language... – João Marques Dec 15 '22 at 15:59
The burden on the secondary totally affects the magnetization current in a CT: https://electronics.stackexchange.com/questions/646310/why-are-smaller-ratio-current-transformers-physically-larger-than-bigger-ratio-c/646312#646312 – Andy aka Dec 15 '22 at 16:21

Why does the ALF in a current transformer increase with less load on the secondary side?

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