Search

Premium Membership

Learn about power engineering and HV/MV/LV substation design. Study specialized technical articles, papers & video courses. Apply 15% off code on Pro plan: ZX21F

Home / Download Center / Electrical Software Reviews / Short circuit current calculation at various point of electrical circuits (Isc)

Available fault current calculation

Infinite Bus Method

Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)
Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)

1. Fault Current At Transformer

Inputs:

  • Transformer Kva
  • Secondary Voltage of Transformer (Line-Line)
  • Secondary Voltage of Transformer (Line-Neutral)
  • Transformer Impedance (Zt)
  • Transformer Secondary Full Load Current I (Line-Line)
  • Transformer Secondary Full Load Current I (Line-Neutral)

  • KVA Short Circuit At Primary Side
  • Source Impedance (Zu)
  • Total Impedance (Z =Zu+Zt)
  • Short Circuit Current RMS Symmetrical
  • Fault Current At Transformer Secondary ( Isc(L-L)=I (L-L)/Total Impedance)
  • Fault Current At Transformer Secondary ( Isc(L-N)=I (L-N)/Total Impedance)

2. Fault Current At Main Panel

Inputs:

  • Cable Length from Transformer to Main Panel
  • Type of Cable
  • No of Conductor/Phase
  • Size of Phase Conductor
  • Size of Neutral Conductor
  • Type of Race Way
  • Phase Conductor Constant (C1)

  • Neutral Conductor Constant (C2)
  • F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
  • F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
  • M1(L-L) [M=(1/(1+F1)]
  • M2(L-N) [M=(1/(1+F2)]
  • Fault Current at Main Panel Disconnection (L-L) [Isc X M1]
  • Fault Current at Main Panel Disconnection (L-N) [Isc X M2]

3. Fault Current At Sub Panel

Inputs:

  • Cable Length from Main Panel to Sub Panel
  • Type of Cable
  • No of Conductor/Phase
  • Size of Phase Conductor
  • Size of Neutral Conductor
  • Type of Race Way
  • Phase Conductor Constant (C1)

  • Neutral Conductor Constant (C2)
  • F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
  • F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
  • M1(L-L) [M=(1/(1+F1)]
  • M2(L-N) [M=(1/(1+F2)]
  • Fault Current at Sub Panel Disconnection (L-L) [Isc X M1]
  • Fault Current at Sub Panel Disconnection (L-N) [Isc X M2]

4. Fault Current At Distribution Board

Inputs:

  • Cable Length from Sub Panel to Distribution Board
  • Type of Cable
  • No of Conductor/Phase
  • Size of Phase Conductor
  • Size of Neutral Conductor
  • Type of Race Way
  • Phase Conductor Constant (C1)

  • Neutral Conductor Constant (C2)
  • F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
  • F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
  • M1(L-L) [M=(1/(1+F1)]
  • M2(L-N) [M=(1/(1+F2)]
  • Fault Current at Distribution Board Disconnection (L-L) [Isc X M1]
  • Fault Current at Distribution Board Disconnection (L-N) [Isc X M2]

Software:Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)
Version:
Developer:Jignesh Parmar
Size:85 Kb
Price:Free
Download:Right here | Video Courses | Membership | Download Updates
Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)
Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)

Premium Membership

Get access to premium HV/MV/LV technical articles, advanced electrical engineering guides, papers, and much more! It will help you to shape up your technical skills in your everyday life as an electrical engineer.
More Information

39 Comments


  1. Pol Sanahuja
    Apr 20, 2020

    Is it possible that in the base MVA method tab there is an error in the calculation of fault current at Main LT Panel?

    I think that there is an error because the impedance of the transformer is not added to the impedance used for the calculation and I’m getting results like 2 000 KA -> 2 000 000 A

    Please confirm

    PD.: Can I have the password to modify the spreadsheets?


  2. Romell Bojie Belleza
    Apr 15, 2020

    Good day Edward could you pls send me a copy of short ckt current calculation at various point of electrical circuits in excel..thank you


  3. Felipe Rengifo
    Apr 15, 2020

    Un saludo


  4. Abir Hasan
    Apr 14, 2020

    please send me
    [email protected]gmai.com
    regards


  5. Chris Dodds
    Sep 09, 2019

    All: Where the system peak fault current and the cable diameter are known, the formula featured in the below Article, excerpted from the international standard IEC 61914, can be used to calculate the forces between two conductors in the event of a 3 phase fault in order to specify the correct type of cable cleats.

    IEC 61914 – Cable Cleats & Short Circuit Protection Calculations
    https://www.powerandcables.com/iec-61914-cable-cleats-short-circuit-protection/

    Chris Dodds
    Thorne & Derrick http://www.powerandcables.com

Leave a Comment

Tell us what you're thinking... we care about your opinion!

EEP Academy Video Courses

The learning platform for LV/MV/HV electrical engineers. Learn from experienced engineers and sharpen up your knowledge.
Electrical Engineering Software