The power of a single-phase transformer generally varies from a few kVA to several hundred kVA, depending on its design and application. Single-phase transformers commonly used in residential and light commercial applications can range from 1 kVA to 50 kVA. For industrial or larger needs, single-phase transformers can be designed to handle up to 100 kVA or more.

The power of a single-phase transformer is measured in kilovolt-amperes (kVA). This rating represents the transformer’s ability to handle electrical energy without considering power factor.

For example, a single-phase transformer rated at 10 kVA can handle up to 10 kilovolt-amps of power, which translates to the amount of electrical load it can handle efficiently.

To determine how much kVA a transformer has, you can check its nameplate or the technical specifications provided by the manufacturer. The kVA rating is usually listed on the transformer nameplate, along with other important details such as rated voltage, rated current, and frequency.

If nameplate information is not available, you can calculate kVA based on the voltage and current rating of the transformer using the formula: kVA = (Volts x Amps) / 1000.

The kVA of a transformer is determined by its design specifications and is a key indicator of its ability to handle electrical loads. The kVA rating is calculated based on the transformer’s ability to deliver power without exceeding its design limits.

This rating helps match the transformer to the required load capacity in electrical systems.

The current of a 25 kVA transformer can be calculated using the formula: Current (Amps) = kVA x 1000 / Voltage (Volts). For example, in a single-phase 240V system, the current would be 25,000/240 = approximately 104.17 amps. In a three-phase system with a voltage of 415 V, the current would be 25,000 / (415 x √3) = approximately 34.8 amps.