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Circuit Breaker Tripping Settings

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Setting of instant short circuit tripping of C.B/ selection of circuit fuse

Calculation of instant short circuit tripping of circuit breaker is based on following inputs:

• Voltage(L-L)
• Voltage(L-N)
• Instantaneous Short-Circuit Triping Set
• Accuracy
• Cable Size
• Cable Material
• Actual Length of Cable

And according to what you select or choose, result of maximum length of cable for your tripping setting is calculated. Selection of fuse is based on circuit wire size input (1,5mm2 – 70mm2).

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1. jose antonio salazar hidalgo
Nov 22, 2021

Good afternoon Sir
I want to make the following constructive comment in order to improve your appreciable and very useful spreadsheet CB-Tripping-Setting-Motor-Data in the motor data tab:
In cell K9 the efficiency of the motor (cell F21) must divide instead of multiply, since it is the input power of the motor from the network
In this way, cell K11, corresponding to the full load current of the motor that it absorbs from the network, takes into account the correct power

Best regards
JAS

2. Tneb KATHIRASAN
Jul 14, 2021

Sir
Have you given for OH lines designed substations with SC Calculations?

3. Sreeraj R
Mar 13, 2021

Jignesh Sir,

My sincere thanks to you for this amazing spread sheet.

i would like to bring to your attention to just one point in this spreadsheet (calculation of voltage drop and cable size for motor / elect. load) by taking an example.

If you consider a 7.5kW (an example) motor only load, at 80% efficiency, the cell I8 gives ‘consumed load’ as 6.0kW (lower than the motor output rating, as a result of multiplying output with efficiency instead of division) and this gives current values that are eventually calculated on this 6.0kW (cell I8) which would be lesser than the actual values we are hoping for.

Please see if this helps so that your spreadsheet still stands out the best among others out there

Best,
Sree

• Sreeraj R
Mar 14, 2021

Jignesh Sir /EEP team,
I realised that i have posted this one wrong thread. Please excuse me for my doing. The feedback was intended for cable sizing program spreadsheet as mentioned in the second paragraph.

4. Mihir
Feb 23, 2017

sir this is very exciting and perfectly helpful for beginners to higher levels here i found every literature about this field and also some software for real time implementation
thank you again sir

5. prashant borate
Aug 11, 2016

what is meaning of ir fault

6. Naing Aung tun
Jun 20, 2014

Thank you for kind

7. ISMAEL
Jan 14, 2014

Very nice site and very intresting

8. mod232
Jan 11, 2014

sir
how i can registry in ur website

9. cengizaras
Aug 25, 2011

Dear Sirs,
regards

• Edvard
Aug 25, 2011

Hooh, that might be the problem! You can make a list of stuff you would like to download and send it via contact form https://electrical-engineering-portal.com/contact

Just make sure to send URLs of stuff you’re interested in, so I can find’em and sent it to you.

BR