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12 pulse package


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#1 Mohammad Imran

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Posted 23 February 2005 - 04:01 PM

What is 12 pulse DC package and waht is of use it.

#2 marke

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Posted 24 February 2005 - 09:08 AM

Hello Mohammed

A three phase rectified voltage results in a positive "pulse" of current on each phase and a negative "pulse" of current on each phase in each cycle. This results in six "pulses" per cycle. There are harmonics associated with these pulses.
The three phase supply has angular displacements of 120 degrees.
A 60 degree phase shifting transformer can be used to add an additional three phases offset by 60 degrees. This results in a six phase supply.
A six phase rectifier produces twelve "pulses" of current on the supply, and is used as a means of reducing the harmonic currents on the supply.

Best regards,

#3 Mohammad Imran

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Posted 24 February 2005 - 03:04 PM

thanks Mr marke for sending this useful information. Kindly send some information on the question given below.

What should the field control on a DC motor set the field to when the
>motor trips on Over-voltage or Over-speed. Why?




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