Dry-type transformer is an important power equipment, which plays an important role in the work. It is mainly used in the fields of high-voltage power transmission, power distribution and industrial power consumption. Its operating principle is based on the principle of electromagnetic induction.

Basic Working Principle of Three-Phase Dry Type Transformer

The working principle of three-phase dry-type transformers involves electromagnetic induction and voltage transformation, which are the key factors for their ability to increase or decrease voltage. The following is a detailed description:

Three phase system: Firstly, we need to understand the basic composition of a three-phase power system. This system includes three phases of AC current, with a phase difference of 120 degrees. This three-phase power system is commonly used because it provides an efficient and balanced power transmission method, suitable for various power applications.

Structure: A three-phase dry-type transformer typically consists of three coils, which include a main coil, a secondary coil, and possibly a neutral coil. The main coil is usually connected to the power supply, and the secondary coil is connected to the load. These coils are wrapped in an iron core, usually composed of silicon steel sheets, to enhance electromagnetic induction effects.

Electromagnetic induction: When AC current flows through the main coil, it generates an alternating magnetic field in the iron core of the transformer. This alternating magnetic field, also known as magnetic flux, is the result of changes in current. Due to physical contact between coils, this alternating magnetic field passes through the secondary coil. According to Faraday’s law of electromagnetic induction, an electrically induced electromotive force will be generated in the secondary coil, causing a change in voltage. By controlling the ratio of turns between the main coil and the secondary coil, transformers can achieve voltage increase or decrease, allowing electrical energy to adapt to different power demands.

Turn ratio: The turn ratio is a key factor in determining the voltage conversion ratio. If the number of turns of the main coil is greater than that of the secondary coil, the output voltage will be higher than the input voltage, thereby achieving boost. On the contrary, if the number of turns of the secondary coil is greater than that of the main coil, the output voltage will be lower than the input voltage, achieving voltage reduction.

Ideal Transformer Principle: In an ideal situation, three-phase dry-type transformers have no energy loss. This means that it can transmit electrical energy with 100% efficiency, but in reality, there will be some energy loss, mainly from conductor resistance and magnetic core loss. Therefore, actual transformers are usually designed very precisely to minimize energy loss.

By understanding the working principle of three-phase dry-type transformers, we can better understand their critical role in the power system. They can not only achieve voltage conversion, but also provide stable and reliable power supply in different applications.

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Company Profile

GNEE Electric was founded in 2008 and is a professional company engaged in the research and development, production, sales, and technical services of power products such as dry-type transformers, three-dimensional coil iron core transformers, amorphous alloy iron core transformers, amorphous three-dimensional coil iron core transformers, photovoltaic substations, energy storage equipment, high and low voltage switchgear, outdoor box type substations in Europe, America, China, and intelligent substations. It is a production service enterprise that integrates construction general contracting. The product is widely used in fields such as State Grid, Southern Power Grid, railways, mines, infrastructure, metallurgy, highway bridges, and real estate management systems.