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# CT saturation test

1. ## CT saturation test

During a saturation test of a 1500/5 multi-ratio CT, 400 volts is applied to the X1 to X4 tap. The X1 to X4 tap is the 1200/5 ratio. What is the expected voltage across the X1 to X5 tap?

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Originally Posted by dukeofsmooth
During a saturation test of a 1500/5 multi-ratio CT, 400 volts is applied to the X1 to X4 tap. The X1 to X4 tap is the 1200/5 ratio. What is the expected voltage across the X1 to X5 tap?
500 volts

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Originally Posted by CQCmaster
500 volts
This may be a trick question and the answer is 400V? If 400V is applied then how would you get 500V on X5?

4. Originally Posted by lakjdfslk
This may be a trick question and the answer is 400V? If 400V is applied then how would you get 500V on X5?
Think autotransformer and how they work. Single winding around a core with multiple tap points (voltages). Apply voltage across the lower voltage tap to reference, and you will get the higher voltage output at the higher tap to reference.

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