HV power transformer at 200Hz

[boxi]

Does anybody know how higher frequency (up to 200Hz) will affect transformer impedance (ez) compared with 50-60Hz transformer. I know that transformer will be smaller and lighter but approx value of ez worse to guess. power of transformer are in range 10-15MVA.

 

[dpc]

If you are talking about running the same transformer at 60 Hz and 200 Hz, the impedance will be much higher at 200 Hz. Roughly 3 times greater, I would say, since nearly all of the impedance is leakage reactance which varies directly with frequency.

If you are talking about a transformer designed to operate at 200 Hz, I'm not sure, but I'm guessing it will work out to a similar percentage of the base MVA as a transformer designed for 60 Hz.