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Home / Technical Articles / How to make calculation for a distribution substation 10/0.4 kV, 2×1600 kVA

Introduction to calculations

Distribution substations with an installed power of 2×1600 kVA are a typical example of electrical power supply facilities which can be often seen all around Europe and wider. By “calculation” of such a substation, it is assumed that values of all relevant physical quantities shall be determined, and all major equipment inside the substation shall be specified according to these values.

How to make calculation for a distribution substation 10/0.4 kV, 2x1600 kVA
How to make calculation for a distribution substation 10/0.4 kV, 2x1600 kVA

Within this article, an example of this type of calculation for electrical equipment will be given.

A basic guide for calculations and dimensioning will be adequate IEC standards and practical engineering experience. Of course, besides electrical, there will be also civil and HVAC (Heating Ventilation and Air Conditioning) requirements for substation which need to be fulfilled, but they are out of the scope of this article.


  1. Substation example
    1. Continuous current calculation and dimensioning
    2. Short circuit calculation and dimensioning
    3. Summary of selected equipment

1. Substation example

When we say “2×1600 kVA” that means two power transformers, each of them with rated power of 1600 kVA, will be installed inside substation.

Strictly speaking, but not necessary, 2×1600 kVA designation assumes a substation capable to cover a peak power demand of 2×1600=3200 kVA. That further implies a parallel operation of transformers, i.e. both transformers will carry the load at the same time.

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Miodrag Kokotovic

Graduated from Faculty of Electrical Engineering, within University of Belgrade, in the field of electrical power systems. Expert in electrical part of tender preparation, design, procurement, construction and commissioning of treatment plants and pumping stations, electrical power quality and energy management.

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