Three-phase dry-type transformer

In today's power system, three-phase dry-type transformers play a vital role. They ensure efficient transmission of power and adapt to various power needs by boosting and stepping down voltage. This article aims to illustrate its basic working principles and its criticality in power systems, highlighting how electromagnetic induction makes voltage rise and fall possible.

Next, we will delve into the wide range of applications of three-phase dry-type transformers in power transmission, industrial, commercial, construction and electronic equipment, as well as their importance in renewable energy systems.

Subsequently, we will focus on future trends and technological innovations, including the application of digitalization, intelligence, new materials and efficient design to meet the needs of future power systems. The goal of this article is to provide readers with an in-depth understanding of the basics of three-phase dry-type transformers, as well as a clearer understanding of their ongoing evolution and development prospects in the power industry. Three-phase dry-type transformers play a key role in power systems and continue to shape the future of the power industry.

II. Basic working principle of three-phase dry-type transformer

The working principle of a three-phase dry-type transformer involves electromagnetic induction and voltage conversion, which is the key to its ability to step up or step down voltage. The following is a detailed description:

Three-phase system: First, we need to understand the basic components of a three-phase power system. This system consists of three phases of alternating current that are 120 degrees apart. This three-phase power system is commonly used because it provides efficient, balanced power transmission for a variety of power applications.

Construction: Three-phase dry-type transformers usually consist of three coils, which include a primary coil, a secondary coil, and possibly a neutral coil. The primary 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 constructed of silicon steel sheets, to enhance the electromagnetic induction effect.

Electromagnetic Induction: When AC current flows through the main coil, it generates an alternating magnetic field in the core of the transformer. This alternating magnetic field, also known as magnetic flux, is the result of changes in electrical current. Due to the physical contact between the coils, this alternating magnetic field travels into the secondary coil. According to Faraday's law of electromagnetic induction, an electrically induced electromotive force will be generated in the secondary coil, resulting in a change in voltage. By controlling the ratio of the turns of the primary coil and the secondary coil, the transformer can step up or step down the voltage so that the electrical energy can adapt to different power needs.

Turns ratio: Turns ratio is the key factor that determines the voltage conversion ratio. If the primary coil has more turns than the secondary coil, the output voltage will be higher than the input voltage, thus achieving a voltage boost. On the contrary, if the secondary coil has more turns than the primary coil, the output voltage will be lower than the input voltage, achieving a voltage reduction.

Ideal transformer principle: Ideally, a three-phase dry-type transformer has no energy loss. This means that it can transmit electrical energy with 100% efficiency, while in reality there will be some energy loss, mainly from conductor resistance and core loss. Therefore, actual transformers are usually designed very precisely to minimize energy losses.

By understanding how three-phase dry-type transformers work, we can better understand their critical role in power systems. They not only enable voltage conversion but also provide stable and reliable power supply in different applications.