How to Calculate the Bus Bar Size

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  • #10705
    Abdul Basit Khan
    Participant

    Sirs,

    Can you tell me the bus bar size, we have 200kVA transformer, one 275 kVA Generator, and how we calculate the bus bar size for panel.

     

    Regards,

    Abdul Basit

    #12592
    smorkos
    Participant

    you can use bus-bars 20*10mm or up. but take care about the short circuit level and choose the bus-bars holders aacordingly.

    #12590
    Abdul Basit Khan
    Participant

    smorkos said:

    you can use bus-bars 20*10mm or up. but take care about the short circuit level and choose the bus-bars holders aacordingly.


    Thanks for guidence but what is the formula to calculate the bus bar size.

     

    Regards,

    Abdul Basit

    #12646
    admin
    Keymaster

    Hi Abdul,

    I was browsing net found out your concern might be helpful to solve your problem.

    Smorkos is correct. You should have consider by calcualting the actual short circuit current on the system(sym & assym value) and the bus bar holder. This is the basis for calculating the mechanical strenght of the bus Bus bar calcualtion to be safe and protect for max. short circuit current (KA) during fault condiotn. The formula is not easy you have to consider the following items:

    EMF between bus bar

    Bus bar arrangement

    Mechanical forace action supporters

    mechanical force or tensile strength on bus bar

    flexure of bus bar

    Thermodyanmic consideration

    Those mentioned above shall be consider in calcualting the bus bar

    TIp: Vendor has data and formula of  bus bar size with respect to the total consumer Loas (amps)

    As i can see and experience 35*4 is economically with a safe factor of 152% based on the Transformer rated current.

    Hope this will help

    #12744
    hafsa
    Participant

    anyone solve this problem now? I need help…

     

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    #12783
    admin
    Keymaster

    Abdul Basit Khan said:

    Sirs,

    Can you tell me the bus bar size, we have 200kVA transformer, one 275 kVA Generator, and how we calculate the bus bar size for panel.

     

    Regards,

    Abdul Basit


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