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 |
How can I edit the spreadsheet, we follow NEC guidelines.
Thanks,
Thomas Philips
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?
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
Un saludo
please send me
[email protected]
regards
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
Hello sir,
I actually performed some physical tests on Power Transformers but I’m interested in the digital aspect and how I can deploy the use of algorithm. Also that I want to simulate the practical result onto the simulation model. I would need assistance on how to apply my result on the simulation platform.
I crave your indulgence to assist me to gain the knowledge.
I wish to send you the test results. My mail address is [email protected]
Thanks in anticipation.
Regards.
Good day sir, please with winding test, ratio test and excitation test on transformer
how can I know the capacity of a transformer (KVA) without looking at the name plate.
Hi Sir Edvard can you also send this to my email [email protected] Thank you very much.
I need to join EEP memberships network ,for engineering purpose to upgrade my career as power engineer .
Buenos días Ing. Edvard cordial saludo, quisiera saber cuando abra una hoja de cálculo de las que ofrecen en forma gratuita, por qué me pide contraseña y si trato de buscarla me dice que debo pagar.
Cómo desbloqueola hoja en Excel para poder trabajar.
Ejemplo la hoja de Nivel de Cortocircuito?
Quedo atento a su respuesta
Feliz día
sir
kindly let me know the cable size calculation complete formula and explain how to use that formula .Even i want to know the various design aspects of electrical design of cable size ,cable selection,
Very handy tool. Would like to see the cables listed in AWG size also and standard measurements compared to metrics. I am an American, we are different, haha!
Hi Edvard, good afternoom
Please, do you have a sheet plan to short circuit in CC?
Best regards.
Edson
Hey edward could you please send me a copy of the short circuit calculator xls. Your help would be very much appreciated. Thank You .
Dear sir
i have three question
1-could i know the formula you used from which standard or code you take it ?
2- for Phase Conductor Constant , can you send me the catalogs which took from (because it different from country to other ) ?
3- Do you have an AWG cable size equivalent ? (whith mention your resource )
best regards
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,
Murugadoss
you may also consider Short Circuit Analytic software program and mobile apps for short circuit fault current calculations. The program factors in both active and reactive parts of equipment impedance and takes into account fault current contributions from multiples sources including motors and generators:
http://arcadvisor.com/short-circuit-software
sir
kindly let me know the cable size calculation complete formula and explain how to use that formula .Even i want to know the various design aspects of electrical design of cable size ,cable selection,circuit breaker calculation,trays,etc.
as im new and working in construction field.kindly help me out
IEC 61914 covers the electrical engineering calculation for the correct selection and specification of cable cleats to retain power cables in the event of a short-circuit http://www.cablejoints.co.uk/blog/article/iec61914-cable-cleats-ellis-patents
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