Search

Premium Membership

Save 15% on Pro Premium Plan with discount code: SX79 (expires on May 31st). Study specialized LV/MV/HV technical articles and papers.

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. KUMAR
    Dec 03, 2013

    its not setisfied i need full calculation of short ckt current….


  2. Faruque Ahmad
    Aug 18, 2013

    Thank you for your support.

    Can you please send me a format for calculating Isc for a panel fed from generator. (e.g. 2.75MVA CAT Genset feeds to a Panel of 4000A, 415V, 4C armored cables).

    Or please advice to: [email protected]

    Best regards,


  3. MILIND TAMBAT
    Mar 21, 2013

    I am not able to free down load free EL. ENG. Technical articles.
    Can you please advice
    Thanks


    • Edvard
      Mar 21, 2013

      As a registered member (and you are), normally you should see download link ‘Right here’.

      If you have problem with downloading, please send me email on office at electrical-engineering-portal dot com

      Best regards,
      Edvard


  4. Allen
    Jan 05, 2013

    Could you please develop the Excel calculation sheet for sizing of Soft Starter with the curve appearance.


    • Edvard
      Jan 05, 2013

      EEP is not the developer of any MS Excel Spreadsheet here. All spreadsheets are developed by engineers who wanted to share their entusiasm and knowledge with everybody.


  5. fayinminu tosin
    Feb 01, 2012

    Hello, could you please solve the short circuit problem manually using point to point calculation. A better explanation on how you arrived at your answer would also be appreciated. Kindly send your reply to: [email protected] or [email protected].

    • One 480V motor feeder, 100HP, 100m length, for both underground installation and offshore installation in cable trays. Assume MCC is fed from switchgear, on the secondary of a 750kVA transformer, 4160-480V. The check for Voltage drop should be for running and starting conditions
    • One feeder cable to a Power Panel, 480V, 100kVA, 200 m distance
    • One 250 HP, 4.16kV motor, 100m length for both underground and cable tray installation. Assume 4.16kV MCC is fed from 4.16kV switchgear having a short circuit rating of 200MVA, the feeder length is 50Ft.
    • One remote 4.16kV-480V transformer feeder, 200m length, 500kVA.
    • One line diagram for the system (4.16kV and 480V) shall also be prepared.
    • Primary short circuit calculation (using reactance and resistances in ohms, not p.u.)
    • Assume the generation is with 2+1 1250kVA, 4.16 kV Solar Saturn 20 gas turbine generators (sub transient reactance is 12.5%).


  6. jbuda54
    Jan 03, 2012

    Do you have an AWG cable size equivalent excel file?


  7. Edvard
    Dec 15, 2011

    I have sent you all an email with this tool. Hope it will help!

    Cheers


  8. GP
    Dec 14, 2011

    Please can you forward Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc) excel sheet to me on my email address- [email protected]

    Thanks


  9. Simon
    Dec 14, 2011

    Hi Edvard,

    Nice work, can you send me on a copy of the excel tool please? I’m having difficulty downloading it too. Thanks.
    Simon.


  10. Sairaj
    Dec 07, 2011

    Sir,
    Kindly send the excel tool for SC calculation as I am unable to download. My id: [email protected].. Thanks in advance..


  11. RamaRaju
    Dec 06, 2011

    Dear Edvard,
    Request you to send me a copy of the excel file for Short CKT Calcs as I am unable to download from the link.
    My mail id: [email protected]
    Thanks & Regards,
    Raju


  12. Marcus
    Dec 04, 2011

    Dear Sir, will you be able to send me a copy of the excel file? I am having trouble downloading it too. thanks heaps for your great work. [email protected]


  13. Brkn
    Dec 02, 2011

    Dear Edvard,
    Can you send to my e.mail too.
    My e.mail is: [email protected]
    Thanks.


  14. S P Gupta
    Nov 29, 2011

    Please send the software for calculation of short circuit as it is not getting down-loaded. Thanks


    • Edvard
      Nov 29, 2011

      I just checked and MS Excel tool is working very well, it’s downloadable. However, it’s my pleasure to se send it to you!

      Check your email!

      BR


  15. ahmadgce04
    Nov 28, 2011

    sir, this short ckt. sheet is not getting downloaded on my system due to some network problem.so please send the Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc) excel sheet me on my email address- [email protected]. i will be very much thankfull for your kind support.


    • Edvard
      Nov 28, 2011

      No problem at all Ahmadgce04! I just sent you above mentioned XLS tool on your email.

      BR

Leave a Comment

Tell us what you're thinking. We care about your opinion! Please keep in mind that comments are moderated and rel="nofollow" is in use. So, please do not use a spammy keyword or a domain as your name, or it will be deleted. Let's have a professional and meaningful conversation instead. Thanks for dropping by!

  ⁄  one  =  2

Learn How to Design Power Systems

Learn to design LV/MV/HV power systems through professional video courses. Lifetime access. Enjoy learning!

Subscribe to Weekly Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and guides (PDF).