Motor-Generator Set Bolted Fault

[SmokinJoeR]

Hi,

I have a 30hp 39A @ 440V 3 phase AC induction motor turning a 20kVA 58A @ 200V synchronous generator. My question is how could I calculate the line current into the AC motor if a fault was to occur on the generator output? I have asked the manufacturer of this M-G set for this information and they do not have any.

Is there some form of fault current calculation I can do for the generator which will give me a torque value and then use that to calculate the kind of current the AC motor will pull?

Thanks for your help

-Joe

 

[waross]

The transformers are optional on series lighting. They are sometimes used to change the current. An instance of this was street lighting on streets where street cars ran. The vibration caused by the passing steel wheeled street cars had a tendency to break the filaments in the street lights. 20 amp lamps had a filament like a toaster element and would withstand the vibration. However the system I²R losses were fairly high. The solution was to use a 6.6 Amp or 7.5 amp to 20 Amp transformer to feed 20 Amp lamps from a 6.6 Amp or 7.5 Amp constant current system. At each lamp there is a cutout. These were disks about 5/8" in diameter, with paper insulation separating metallic disks. When a lamp failed, the system Voltage would appear across the lamp terminals and also across the safety cutout which was across the lamp terminals. The safety cutouts would short out somewhere above 100 Volts and bypass the failed lamp.

Bill
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"Why not the best?"
Jimmy Carter