25 kva transformer

A 25 kVA transformer is an electrical device that converts high-voltage electrical energy into low-voltage electrical energy. With a capacity of 25 kVA, it is commonly used in some small factories, commercial venues, residential communities, etc., to provide appropriate power supply for various electrical equipment. The following is some information about it:

Working Principle

Based on the principle of electromagnetic induction, through the primary and secondary windings on the closed iron core, the high voltage and low current on the primary side are converted into low voltage and high current on the secondary side to meet the power consumption requirements of different loads. In an ideal state, the input power of the transformer is equal to the output power, that is, \(P_{in}=P_{out}\). However, in actual operation, due to factors such as iron core losses and winding resistance losses, there will be certain energy losses.

Structural Composition

- **Iron Core**: Generally stacked with silicon steel sheets, it is a part of the magnetic circuit of the transformer. It has the characteristics of high magnetic permeability and low hysteresis loss, and can effectively transmit and concentrate the magnetic field.

- **Windings**: Divided into the primary winding and the secondary winding, usually wound with copper or aluminum wires. The primary winding is connected to the input power source, and the secondary winding is connected to the load. The transformation of voltage is achieved through the difference in the number of turns of the windings.

- **Insulation System**: Including winding insulation, iron core insulation, and oil insulation (for oil-immersed transformers), etc. It is used to prevent electrical short circuits between windings, between windings and the iron core, and between the transformer and the outside. At the same time, it can also play the roles of heat dissipation and moisture prevention.

- **Tank**: Used to hold the transformer oil (for oil-immersed transformers), it provides heat dissipation and insulation media for the windings and the iron core, and at the same time protects the internal components from the influence of the external environment.

- **Cooling System**: For oil-immersed transformers, heat is carried away through the circulation of the transformer oil; for dry-type transformers, air natural cooling or forced air cooling methods are generally adopted.

 Application Scenarios

- **Industrial Field**: It supplies power to small processing equipment, production lines, etc., such as some small mechanical processing factories, electronics factories, etc.

- **Commercial Field**: It is used to supply power to equipment such as lighting, air conditioners, and elevators in shopping malls, hotels, office buildings, and other places.

- **Residential Life**: In some residential communities, it provides power conversion for public facilities in the community such as streetlights, elevators, water pumps, etc., as well as for residential household electricity.

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 Selection Key Points

- **Voltage Level**: Determine the voltage of the primary side and the secondary side according to the actual power consumption requirements, such as the common 10kV/0.4kV, etc.

- **Load Characteristics**: Consider the type of load, whether it is a resistive, inductive or capacitive load, as well as parameters such as the starting current and operating current of the load to ensure that the transformer can meet the power supply requirements of the load.