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CT saturation test

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    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?
    *Give me a smart idiot over a stupid genius any day*

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    Quote Originally Posted by dukeofsmooth View Post
    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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    Quote Originally Posted by CQCmaster View Post
    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?

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    Quote Originally Posted by lakjdfslk View Post
    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.

    Click image for larger version. 

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