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How will work motor 460V 3ph 60Hz at 380V 3ph 50Hz power net?
It will not work at all.
Why does one line of 3 phase 480v show 0 volts and the other 2 have 480?
My first thought is this is probably a corner grounded delta system, but I'm confused by your voltages. If this was a 460v (L-L voltage) ungrounded or corner grounded system, the phase to ground voltage is meaningless, but the phase to phas voltage will be 460v all around the delta. If you have a 460v system and you're only seeing 230v, there's something wrong.
What generator size for twin 150 hp 480 3 phase motors 800 amps for a tire shredder.?
First of all, a 150 HP 460V 3-phase motor only draws around 170A, so two of them would only draw 340A, not 800. 340A at 460V equals almost 300,000 watts (or 300kw), and the generator would need to be sized a little bigger than this to start such big motors.
Wire size for a 15 KVA transformer?
Primary : 4 Secondary : 3/0 <<>> To answer this question correctly a voltage must be stated.
Can a 3 phase 415V- 1000V step up transformer operate correctly from 460V Ac supply without causing damage?
That's an 11% overvoltage (460/415), so this may be reaching the design limits of the transformer. If the system is actually run hot (say 105% of 460, or 480v), then I'd say no, unless specifically stated in test reports or design criteria. You should ask the manufacturer to be sure.
