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    scabml's Avatar
    scabml Posts: 1, Reputation: 1
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    #1

    Mar 20, 2008, 11:45 AM
    50hp ac motor
    Can you tell me how many amps would I need out of a 480v transformer to startup a 50 hp AC motor?
    danar's Avatar
    danar Posts: 69, Reputation: 2
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    #2

    Mar 24, 2008, 04:49 AM
    There are many condition to be met in sizing up your transformer to start up a 50hp 3phase ac motor.

    1. the starting kva of your motor. (per NEMA code Letter Designation)
    2. the voltage sag during motor starting should satisfy the 10% drop requirement.
    3. the selection of starter (FVS- full Votage Satrater, RVS- reduce Voltage Starter)
    4. the transformer must be sized to its short circuit capability
    Jithendran's Avatar
    Jithendran Posts: 13, Reputation: 1
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    #3

    Apr 3, 2008, 05:13 AM
    I can understand from your question that the transformer output is 3 Phase of 480 V.You have to connect an motor of 50 Hp to the same source.
    Now I shall suggest you to check the motor characteristic curve which tell you the motor performance under load condition,Based on this you can choose the rating of the fuse & starter type .Typically for 50 Hp motor the fuse shall be 100A.
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