Available fault current calculation
Infinite Bus Method
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 |
its not setisfied i need full calculation of short ckt current….
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,
I am not able to free down load free EL. ENG. Technical articles.
Can you please advice
Thanks
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
Could you please develop the Excel calculation sheet for sizing of Soft Starter with the curve appearance.
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.
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%).
Do you have an AWG cable size equivalent excel file?
I have sent you all an email with this tool. Hope it will help!
Cheers
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
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.
Sir,
Kindly send the excel tool for SC calculation as I am unable to download. My id: [email protected].. Thanks in advance..
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
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]
Dear Edvard,
Can you send to my e.mail too.
My e.mail is: [email protected]
Thanks.
Please send the software for calculation of short circuit as it is not getting down-loaded. Thanks
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
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.
No problem at all Ahmadgce04! I just sent you above mentioned XLS tool on your email.
BR