Quote:
Originally Posted by wa2ise
To a first order approximation, a transformer rated for 120V @ 400 will do (60/400)*120v=18V at 60Hz. Probably not too many uses for a 18V primary transformer  But at the same way, the 120V 25Hz transformer could do (60/25)*120V=288V at 60Hz, assuming the insulation on all high voltages are up to handling it. Had a class in this back in the mid 70's in my BSEE major at Syracuse Univ. Some industrial environments actually have power at 277V @ 60Hz (480V delta would be 277V Y (3 phase)). Maybe that's where 277V came from, power companies making use of 25Hz transformers at 60Hz... |
Most industrial environments are 480/277. Interesting proposition.