Help me about rectifier

Discussion in 'General Electronics Chat' started by petrus, Apr 4, 2005.

  1. petrus

    Thread Starter New Member

    Apr 4, 2005
    Hi... :) I'am new member from indonesia...

    I have problem about Rectifier circuit... :(

    my machine in my factory short circuit at rectifier
    than type of rectifier is 15MA400 (37~45A 4000V)
    But that rectifier build with series wiring 10 pcs
    We searching at indonesian market cannot find...
    but we find other type 15MA300 (37~45A 3000V)

    My question is..
    - Can I change original type with other type (15MA300) for wiring with 13pcs..??
    - Can I joining 2 type rectifier on 1 wiring..??
    - Can anyone help other type or other wiring for change my rectifier wiring set..??

    thank you verymuch for your atention...

    Engieering Dept Engine
  2. mozikluv

    AAC Fanatic!

    Jan 22, 2004

    your best option is to replace that with the original specs and order it direct from the manufacturer. :)

    the next option is to replace it with a lower voltage spec but of the same current rating. for the moment i can't say you can or cannot. we don't know at what voltage level is your rectifier rectifying. you see that 4000v is your breakdown voltage.

    pls be specific with more infos so appropiate suggestions can be presented. we have great guys here that can help you out :)
  3. PAB

    New Member

    Jun 21, 2007
    sorry i know this is slightly off topic but i am new to this forum and have not worked out how to start anew topic.

    What i am after is the formula to calculate the output voltage of a polyphase rectifier.

    Eg. I have a 3 phase PRI (415VRMS) supplied transformer @ 50Hz, and SEC output of 380VRMS on a DELTA Tap, and 380RMS on a STAR Tap.

    This gives me 2 sets of 3 phases with a phase difference of 30degrees (if you impose the star winding over the delta).

    Once (SCR) rectified there will be 12 pulses @ 220VRMS (311peak).

    HOW DO I CALCULATE THE RMS recitiied voltage for this circuit (I understand there will be a small ripple voltage between waveforms.
  4. Papabravo


    Feb 24, 2006
    In each of the forum subsections there is a big blue button called "New Thread". Press that and see what happens.