Single Phase Transformer Calculator

Single Phase Transformer

An electrical device with main and secondary windings coiled around a single magnetic core is called a single phase transformer.
It works on the basis of electromagnetic induction, in which a voltage is induced in the secondary winding by a magnetic field created by an alternating current in the primary winding.
In electrical distribution systems, single phase transformers are frequently used to adjust voltage levels, isolate circuits, and effectively match loads to power sources.

A single phase transformer’s main function is to adjust voltage levels to suit the needs of various electrical systems and appliances.
In order to ensure safety and avoid ground faults or short circuits, it offers electrical isolation between primary and secondary circuits.
In order to ensure optimal power transfer between the source and the load, single phase transformers also aid in impedance matching.

Understanding Single Phase Transformer:

Working Principle: The operational concept behind a single-phase transformer relies on mutual induction. This occurs when both the primary and secondary coils are wound around a shared magnetic core. As an alternating current passes through the primary coil, it creates a magnetic field, which in turn induces an electromotive force (EMF) within the secondary coil.

Types: There are several types of single-phase transformers, including:

Core Type: Ideal for use in low-voltage scenarios, this particular transformer features a core constructed from layers of steel laminations and insulation. This design effectively reduces magnetizing current and contains eddy currents within elliptical paths, minimizing flux dispersion.

Shell Type: Ideal for use in high-voltage scenarios, this transformer variant features a core enveloping the windings, offering superior insulation capabilities.

Auto Transformer: This transformer design utilizes a solitary winding for both the primary and secondary functions, presenting an economical and space-saving alternative.

Toroidal Transformer: This configuration aims to decrease the leakage flux emitted by the transformer, thereby diminishing the likelihood of electromagnetic interference.


Simple: Single-phase transformers exhibit a straightforward design and construction, facilitating convenient maintenance and repair procedures.

Cost-Effective: “They frequently come at a lower cost compared to three-phase transformers, rendering them a financially viable choice for smaller-scale uses.”

Widely Available: Single-phase transformers are readily accessible and widely distributed across numerous manufacturers.


Limited Power: Single-phase transformers have restricted power capabilities, rendering them less appropriate for extensive usage in large-scale scenarios.

Efficiency: In large-scale applications, they are not as effective as three-phase transformers, particularly in terms of efficiency.

Complexity: “Despite their straightforward construction, single-phase transformers can pose challenges in specific situations, demanding specialized skills and understanding for their installation and upkeep.”

Connection Types:

Delta: This form of connectivity is sturdy and potent, yet it may pose complexities and difficulties in achieving equilibrium.

Star:This form of linkage is straightforward to convert and uncomplicated, though it lacks the durability of delta connections.

Zigzag: This form of linkage serves the purposes of grounding and minimizing harmonics, although its design can pose complexity.

Open Delta:This form of linkage offers versatility and affordability, albeit at the expense of diminished capacity.

Voltage Levels:

Low Voltage: Appropriate for use in homes and small businesses, this category of transformer functions with voltages under 1,000 volts.

Medium Voltage: Appropriate for both commercial and light-industrial use, this category of transformer functions within voltage ranges spanning from 1,000 to 35,000 volts.

High Voltage: This transformer variant is well-suited for industrial and heavy-duty industrial use, functioning at voltage levels exceeding 35,000 volts.

Efficiency: Single-phase transformers demonstrate high efficiency when utilized in small-scale contexts, yet their efficacy may diminish when employed in larger-scale settings. Despite this, they remain favored due to their simplicity and cost-effectiveness across various applications.


  • Power Distribution
  • Voltage Regulation
  • Electrical Appliances
  • Industrial Equipment

Conclusion:To sum up, single-phase transformers represent a transformer category functioning on single-phase power, catering to residential, light-commercial, and industrial needs. They boast straightforward design, affordability, and extensive accessibility. However, they exhibit constraints in power capacity and efficiency.

You may calculate a single-phase transformer’s voltage, amps, and kilovolt-amps (kVA) with the Single Phase Transformer Calculator. This calculator assists you in determining the appropriate numbers for effective power distribution in single-phase AC systems, regardless of whether you know the kVA, Amps, or Voltage.

Note : Don’t end with comma ( , )

I Want to Calculate
Kilovolt-amps (kVA)
Volts (v)
Amps (A)


\[A = \frac{1000*kVA}{v}\]
\[v = \frac{1000*kVA}{A}\]
\[kVA = \frac{A*v}{1000}\]


  • A = Ampere
  • kVA = Kilovolt-amps
  • v = Volts

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