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    Bubar Calculation

    Uploaded by

    akshay

    Copyright:

    © All Rights Reserved
    Download as XLSX, PDF, TXT or read online from Scribd

    Bubar Calculation

    Uploaded by

    akshay
    33 views3 pages

    Copyright

    © © All Rights Reserved

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    XLSX, PDF, TXT or read online from Scribd

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    Copyright:

    © All Rights Reserved
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    33 views3 pages

    Bubar Calculation

    Uploaded by

    akshay

    Copyright:

    © All Rights Reserved
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    of 3

    Per Phase Bus Strip De rating Factor

    K1 1 No of Bus Bar per Phase 1


    Bus bar Insulating Material De K2 1.2 PVC Sleeving
    Bus bar Position De rating
    Factor K3 1 Edge-mounted bars
    Bus bar Installation Media De
    rating Factor K4 1 Calm indoor atmosphere
    Bus bar Artificial Ventilation with artificial ventilation
    De rating Factor K5 1
    Enclosure & Ventilation De
    rating Factor K6 0.95 Indoors ( Panel is well Ventilated)

    Proxy Effect De rating Factor K7 0.82 min factor


    Altitude of Bus Bar
    installation De rating Factor K8 1 Altitude > 1000m

    Total De rating Factor 0.9348

    Desire Current Rating of Bus


    bar based on Current Density 400
    1.2 Sq.MM
    Current Rating of Bus bar
    after De rating Factor 373.92

    Bus bar Cross Section Area as per Short Circuit= Isc X√ ((K/( θtx100)x(1+ α20xθ) xt

    Faultlevel A 50000
    Material Constant 1.166
    Temp Rise of Busbnar Theta1 135 DegC
    Constant 100
    Constant 1
    Alfa20 (Temp Coeff at 20DegC) 0.00403
    Operating Temp of Busbar 50 DegC
    Duration (Sec.) 1 Seconds

    Bus bar Cross Section Area as per 509.347621963625 Sq.mm


    Short Circuit 10.18695 50
    As per the busbar 40 X 8 the 602 Amps
    Current is

    Bus bar Current Details:


    Rated Voltage 415V
    Desire Maximum Current Rating 400
    of Bus bar (I2)
    Fault Current (Isc) 50KA
    Fault Duration (t) 1 Sec
    Bus bar Temperature details:
    Operating Temperature of Bus 50°C
    bar (θ)
    Final Temperature of Bus bar 185°C
    during Fault(θ1)=.
    Temperature rise of Bus Bar Bar 135°C
    during Fault (θt=θ1-θ)
    Ambient Temperature (θn) 50°C
    Maximum Bus Bar Temperature 85°C
    Rise
    Altitude of Panel Installation on 1000 Meter
    Site
    Bus bar Details:
    Bus bar Material Copper
    Current Density of Bus Bar 1.2 Sq,MM
    Material
    Temperature Co efficient of 0.00403
    Material Resistance at 20°c(α20)
    Material Constant(K) 1.166

    Bus bar Size Calculation

    Current Rating of Bus bar after De rating Factor (I1)= 373.92


    I2 X De rating Factor

    Bus bar Cross Section Area as per Short Circuit 509.35

    Final Calculated Bus Bar Cross Section Area 510


    Actual Selected Bus bar size is 50 X 10
    Panel 1008000000 2560000 0.254%

    40 30 40 30 40 30 40 250

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