Dry transformers — equipment features, areas of use, selection criteria

Dry-type transformers are a type of transformer that do not contain traditional insulating oil or other liquids used to cool and insulate the windings. Instead, they use special materials for insulation and cooling, making them safer, more environmentally friendly and more economical to maintain. complectprom.ru/transformers/suhie-transformatory/.

Here are the main characteristics and advantages of dry-type transformers:

• safety: Due to the absence of internal oil, dry-type transformers pose no risk of fluid leakage or fire, making them safer for use indoors and near people.
• ecological cleanliness: The use of environmentally friendly materials for insulation and cooling makes dry-type transformers more environmentally friendly as they do not contain toxic or harmful substances.
• economical in maintenance: Because dry-type transformers do not require regular insulating oil changes or liquid level monitoring, they typically have lower operating costs and require less maintenance than traditional transformers.
• high efficiency: Dry-type transformers typically have a high material utilization rate and a more efficient cooling system, allowing them to provide stable operation under high loads.
• short circuit resistance: thanks to special design features, dry transformers have increased resistance to short circuits and other emergency situations.

Dry-type transformers are widely used in various industries, such as energy, industry, railway transport, as well as in buildings and structures where reliable and safe power supply is required. Their advantages make them the preferred choice for many applications, especially where safety, reliability and environmental friendliness are a high priority.

• windings: Dry-type transformers, like their traditional counterparts, have two or more windings of wire wound around a ferromagnetic core. The winding through which electric current is supplied is called primary, and the winding on which electric current is inducted is called secondary.
• AC voltage: When AC voltage is applied to the primary winding, it creates an alternating magnetic field around the core of the transformer. This magnetic field induces an alternating voltage in the secondary winding.
• principle of electromagnetic induction: According to Faraday’s law, a change in the magnetic field inside the secondary winding creates an electric current in that winding. The magnitude of this current depends on the ratio of the number of turns in the primary and secondary windings (winding ratio).
• energy transfer: Electrical energy is transferred from the primary winding to the secondary winding through an alternating magnetic field. In this case, the voltage and current in the secondary winding can be different, depending on the ratio of the number of turns in the windings.
• cooling and insulation: Dry-type transformers typically use special materials such as insulating resins or silicone-based fluids to cool and insulate the windings. This allows for efficient cooling and safe operation of the transformer without the use of traditional insulating oil.

Thus, dry-type transformers operate on the same basic principles as traditional transformers, but use safer and more environmentally friendly materials for insulation and cooling. This makes them the preferred choice in many applications where high power reliability and security are required.

Dry-type transformers can be of different types depending on their design, characteristics and specific application requirements. Some of the most common types of dry-type transformers include:

• toroidal transformers: Transformers are ring-shaped and can be compact and lightweight. They are typically used in applications where small size and low power loss are required.
• winding transformers: a classic type of dry-type transformer with wire windings wound around a ferromagnetic core. They provide a wide range of powers and voltages and are used in a variety of applications including power generation, industrial and transportation.
• resonant transformers: These transformers are used in resonant circuits to transmit electrical energy at a specific frequency. They are commonly used in communications, electronics and radio transfer.
• auxiliary transformers: Such equipment is used to supply power to low voltage devices and systems such as lighting, alarms and control.
• instrument transformers: These transformers are used to measure current and voltage in electrical networks. They usually have special characteristics and design to ensure accurate measurements.

In addition, dry-type transformers can be classified according to their power rating, voltage, frequency, type of cooling and other characteristics. The choice of a specific type of dry-type transformer depends on the requirements of a particular application, such as power, reliability, efficiency and safety.

Dry-type transformers can be either standard or custom made, depending on the needs and requirements of a particular client or project.

Standard dry-type transformers usually have standard designs and characteristics that meet generally accepted standards and specifications for various types of applications. They can be available in a variety of power, voltage, frequency and other options to suit a wide range of needs.

However, sometimes it is necessary to custom manufacture dry-type transformers to fully meet specific customer requirements or project features. When custom ordered, transformers can be designed and manufactured to meet the unique technical, geometric, power and electrical characteristics required for a specific application.

The benefits of custom ordering include the ability to obtain a precisely matched solution for specific requirements, tailored to the customer’s production process or infrastructure, as well as taking into account specific technical and operational requirements.

Thus, both standard and customized dry-type transformers have their place in the market and are used depending on the specific needs and goals of the customer.