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Four Fast Transformer Calculations

Distribution transformer calculations spreadsheet provides fast calculations for the following: Determining the MV/LV transformer rating, calculating overcurrent protection device rating on the low voltage side of the transformer, calculating the prospective short circuit current and Calculating natural ventilation openings sizes required for the transformer room.

Distribution transformer calculations - MS Excel Spreadsheet
Distribution transformer calculations – MS Excel Spreadsheet

1. Determining the MV/LV transformer rating

Input parameters:

  • Primary rated voltage (kV.)
  • Secondary rated voltage (kV.)
  • Max. demand load (kW)
  • Power factor after correction
  • Transformer type
  • Permissible loading percentage (%)
  • The nearest standard transformer rating (KVA)

2. Calculating overcurrent protection device rating on the low voltage side of the transformer

Calculating overcurrent protection device rating
Calculating overcurrent protection device rating

3. Calculating the prospective short circuit current across the low voltage side of the transformer

Calculating the prospective short circuit current
Calculating the prospective short circuit current

4. Calculating natural ventilation openings sizes required for the transformer room.

Calculating natural ventilation openings sizes

Software:Distribution Transformer Calculations – MS Excel Spreadsheet
Version:
Developer:Mahmoud Salama
Size:278 KB
Price:FREE
Download:Right here | Video Courses | Membership | Download Updates
Distribution transformer calculations - MS Excel Spreadsheet
Distribution transformer calculations – MS Excel Spreadsheet

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27 Comments


  1. Kelvin
    Sep 30, 2021

    Could anyone share the password of this Distribution Transformer Calculation sheet? It’s in protected mode. Need to unprotect it to understand calculations…

    Thanks


  2. sanjay sharma
    Aug 21, 2021

    Useful. However some basic mistakes are there like the unit of Impedance has been given in Ohm.mile which could not be correct. It should be just Ohm. Further the bottommost table(left side) is presented in a way which can not be called user friendly and technically not correct also.


  3. Muhammad Bilal
    Aug 19, 2021

    I want detail calculations related to the electrical LT HT panels
    CT/ VT calculations
    Breaker sizing
    Cable rating calculation
    If any one have please email me
    I em beginner level


  4. John Ledawo
    Mar 03, 2021

    I desire that you will help me improve based on the how technology has advanced.


  5. Muhammad Asim Hussain
    Mar 01, 2021

    it is simply great


  6. Hervin Hugo Colmenares Quiñones
    Feb 28, 2021

    EEP is the best way I have to update my knowledge in electrical engineering. This article is a sample of the great value of EEP in the world.


    • Fehintola Samson Olusola
      Mar 01, 2021

      This is so helpful. Thank you for this.
      But is would be better if you can define the terms use next time because of beginners. Thank you once again.


  7. md.suzauddoula
    Dec 17, 2020

    it’s very good.


  8. Hakim Walya
    Apr 14, 2020

    I do recommend fellow technicians to make use of the portal. it has been of great value


    • muzaffar khan
      Apr 16, 2020

      How can i down load the templates

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