3-Phase Transformer Calculator

3 Phase Transformer Calculator is a tool that offers the possibility to perform basic electrical calculations of a 3-phase transformer.

3 Phase Transformer Calculator is a tool that offers the possibility to perform basic electrical calculations of a 3-phase transformer. This calculator can help in determining various electrical parameters such as transformer circuit analysis, current, voltage, power and effective power factor calculations, etc. Electrical engineers, technicians and students can quickly and accurately evaluate the electrical characteristics of 3-phase transformers using this calculator. You can easily determine the volts, kVA and amperes required for a three-phase transformer.

When using the Online 3 Phase Transformer Calculator: after selecting the unit you want to calculate, you can calculate by entering other information.



I Want to Calculate
Share by Email

    2 Number of Calculations Used Today


    V = \frac{k \times 1000}{A \times Ph} A = \frac{k \times 1000}{V \times Ph} k = \frac{Ph \times V \times A}{1000}


    • V = Volt
    • A = Amps
    • k = kVA
    • Ph = 3 phase (√3 = 1.732050808)


    How to Calculate a 3-Phase Transformer?

    Calculating a 3-phase transformer involves determining a number of electrical parameters. Basically, these calculations include transformer circuit analysis, various electrical characteristics such as current, voltage, power and effective power factor. Below are some steps that should generally be considered in the calculation of a 3-phase transformer:

    1. Transformer Circuit Analysis: Creating the transformer circuit diagram and performing the circuit analysis is important to determine the connection type of the transformer. Different connection types such as star or delta connection should be taken into account.
    2. Current Calculations: Calculating the current transients and current ratings of the transformer is important to determine how much current the transformer can carry under a given load.
    3. Voltage Calculations: Calculating the voltage values on the primary and secondary side of the transformer is important to determine the relationship between the output voltage and the input voltage.
    4. Power Calculations: Calculating the power output and power input of the transformer is important to determine how much power the transformer can provide.
    5. Effective Power Factor Calculations: Calculating the effective power factor of the transformer is important to determine the efficiency and power factor of the transformer.

    These steps form the basic steps for calculating a 3-phase transformer and help to accurately determine the electrical characteristics of the transformer. These calculations can be used by electrical engineers, technicians and students.

    What is a 3-Phase Transformer?

    A 3-phase transformer is a transformer with three separate windings used to transfer electrical power from one electrical circuit to another. Each winding is divided into two main sections, the primary and secondary side. A 3-phase transformer is widely used in 3-phase electrical systems and plays an important role in industrial applications, energy transmission and distribution.

    A 3-phase transformer processes three separate alternating current (AC) signals with a phase difference of 120 degrees between each phase. Therefore, a 3-phase transformer provides higher power and more efficient energy transmission, unlike a single-phase transformer.

    3-phase transformers are often used in industrial plants, power grids, electric motors and large-scale electrical systems. They are an essential component to ensure strong and stable electrical power.

    3-Phase Transformer Working Principle

    The working principle of a 3-phase transformer is to enable the conversion of electrical power from one phase to another. This principle is based on Faraday’s law of induction.

    Basically, when AC voltage is applied to the primary winding, a magnetic field is generated across the primary winding. This magnetic field creates a magnetic flux that varies with the frequency of the current flowing through the primary winding.

    The magnetic field in the secondary winding interacts with the magnetic field in the primary winding. This interaction induces an EMF (electromotive force) on the secondary winding. This EMF causes current to flow in the secondary winding.

    In a 3-phase transformer, there is a phase difference of 120 degrees between each phase. Therefore, the magnetic fluxes generated in each phase originate from each other with a phase difference of 120 degrees. In this case, the transformer has three separate windings and each winding processes a portion of the 3-phase AC power.

    As a result, a 3-phase transformer transfers the AC voltage applied to the primary winding to the secondary winding by creating a magnetic field, which in turn causes a current to flow in the secondary winding. This principle enables the conversion of 3-phase electrical power and is widely used in industrial applications.

    3-Phase Transformer Types

    3-phase transformers can be of various types and construction according to different application requirements. Here are some common types and types of 3-phase transformers:

    • Dry Type Transformers: These transformers operate in an air-cooled or air-insulated environment. They are widely used in industrial plants and buildings.
    • Oil Immersed Type Transformers: These transformers operate in a tank containing special oil for insulation. They are generally used in large power applications, especially in energy distribution.
    • Distribution Transformers: These transformers are used to transform electrical power into voltage levels suitable for distribution lines and consumers. They are found at many points in the distribution network in cities, rural areas and industrial plants.
    • Power Transformers: Used in high power applications, these transformers are commonly used in power plants, industrial plants and high voltage transmission lines.
    • Automotive Transformers: Used in the automotive industry, these transformers are used for power distribution and control in vehicles.
    • Smart Transformers: These transformers are equipped with digital technologies and communication features. They are used to improve efficiency, ensure reliability and provide remote monitoring and control in electrical networks.

    Each type of 3-phase transformer is designed to meet a specific application or industry requirement and has different structural features, performance characteristics and advantages.

    Uses of 3-Phase Transformer Calculation

    3-phase transformer calculations are used in a wide range of applications in electrical engineering and energy sector. Here are some of the uses of these calculations:

    Energy Distribution and Transmission: 3-phase transformers are widely used in energy distribution and transmission systems. These calculations are performed to convert voltage levels and transport energy from energy sources to consumers safely and efficiently.

    Industrial Applications: In factories, manufacturing plants and industrial facilities, 3-phase transformer calculations are used to ensure proper voltage levels for various electric motors, machines and equipment.

    Electric Motors and Control Systems: 3-phase transformers are used to supply and control large electric motors. This has a wide range of applications in industrial processes and in the transportation sector (e.g. in trains).

    High Voltage Transmission Lines: During the transmission of electrical energy over long distances, the calculations of transformers used in high voltage lines are important to minimize energy loss and improve transmission efficiency.

    Energy Conversion Projects: 3 phase transformer calculations are used in energy conversion projects such as integrating energy from renewable energy sources into the grid or converting different energy forms.

    Telecommunication Systems: 3-phase transformer calculations are used to ensure that power supplies provide appropriate voltage levels to telecommunication equipment.

    These areas cover various application areas related to energy transfer and conversion, where 3-phase transformer calculations are widely applied. Accurately performing these calculations in the design, operation and maintenance of electrical systems is critical for energy efficiency and reliability.