CrimeaPRESS reports:
TSL (dry power transformers) are a type of transformer that is used to change the voltage in electrical networks. The term «dry» in the name indicates the absence of liquid used for cooling and insulation, which is typical for traditional liquid transformers. During the manufacturing process, the transformer winding coils are filled with cast resin (or epoxy), which hardens and protects the conductors from external influences.
In dry-type transformers, the windings are insulated and cooled by air or neutral gas, making them safer and more environmentally friendly than liquid transformers, which can pose a risk of liquid leakage and environmental pollution.
Dry-type transformers are often used in situations where high safety standards are required, such as in buildings, near water sources or in areas with high environmental requirements. They can also be used in technical applications such as wind and solar power plants, where reliability and safety are important.
Dry transformers: pros and cons in comparison
Some advantages and disadvantages of dry-type transformers compared to other types of transformers, especially liquid transformers, are:
Advantages of dry-type transformers
- ecological cleanliness: One of the main advantages of dry-type transformers is that there is no need to use liquid as a cooling medium. This makes them environmentally friendly as they do not pose a threat to the environment in the event of a leak or spill.
- safety: is also a significant advantage of dry transformers. They do not pose the fire and explosion hazards associated with potential fluid leaks.
- low flammable content: Dry transformers do not require flammable liquids, making them safer and less prone to fire.
- low noise level: Dry-type transformers typically have lower noise levels than liquid-based transformers, making them more suitable for use in noise-sensitive environments.
Disadvantages of dry-type transformers
- higher cost: Dry type transformers are usually more expensive than wet type transformers due to the use of special materials and technologies to ensure safety and environmental friendliness.
- less cooling efficiency: Compared to liquid-based transformers, dry-type transformers may have a less efficient cooling system, which can result in higher temperatures and loss of efficiency.
- limited power options: Dry transformers may be less efficient for high power applications compared to liquid transformers due to thermal cooling limitations.
While dry-type transformers have their advantages, including being environmentally friendly and safe, it is important to consider their disadvantages and make careful comparisons with other types of transformers to choose the most suitable option for your specific needs and operating conditions.
Types of dry transformers
There are several types of dry-type transformers, differing in design, insulation materials and other technical characteristics. Here are some of the most common types of dry-type transformers:
- coil transformers: This is the most common type of dry-type transformer. They use spools of copper wire for windings, separated by insulating materials. Coil transformers can be single-phase or three-phase depending on the design and purpose.
- ribbon transformers: Windings are made from strips of copper rolled into a spiral or other shape. This type of transformers can have more compact dimensions and higher power density.
- toroidal transformers: have the shape of a toroid and are a coil wound on a ring base. They usually have high efficiency and low noise levels.
- autotransformers: The windings are usually combined on a single core, which reduces the size and weight of the transformer. They are often used in situations where voltage regulation is required.
- isolated phase transformers: Provide insulation between phases and ground, making them safe for use in three-phase systems.
Each of these types of transformers has its own characteristics, advantages and disadvantages, and the choice of a specific type depends on the requirements of your project, operating conditions and other factors.
In what areas are dry-type transformers useful?
Dry transformers have found application in various fields and industries due to their safety, reliability and environmental friendliness. Here are some of the areas where they are widely used:
- energy: Dry-type transformers can be used in the power industry for transmission and distribution of electricity. They can be installed both at substations and at industrial enterprises.
- industry: In industrial sectors such as metallurgy, mining, chemicals, etc., dry type transformers are used to power electrical equipment and machines.
- transport: Dry-type transformers can be used in railway transport to power electric trains and locomotives.
- Oil and gas industry: In oil and gas industries, dry-type transformers can be used in oil fields, oil refineries and other facilities.
- health and education: In hospitals, clinics, educational institutions and other institutions where safety and reliability are of great importance, dry-type transformers can also be used.
- infrastructure: Dry-type transformers can be installed in buildings, airports, shopping centers and other facilities to provide power supply.
These are just a few examples of applications where dry-type transformers can be used. Their applications are wide and varied, and they can be adapted to different needs and operating conditions.
Dry transformers: selection criteria
When selecting dry-type transformers, it is important to consider a number of criteria to ensure they meet your project requirements and ensure efficient and safe operation. Here are some of the main selection criteria:
- power and rated voltage: It is necessary to determine the required power and voltage rating of the transformer according to the needs of your system.
- insulation type: select type from olation that best suits your requirements and operating conditions. There are different types of insulation such as epoxy resin insulation, polyester resin insulation and others.
- efficiency: Research the transformer’s efficiency, such as efficiency (coefficient of performance), to ensure it meets your energy efficiency requirements.
- dimensions and dimensions: Consider the dimensions and dimensions of the transformer so that it can be installed in the intended location and within the existing space constraints.
- noise level: Pay attention to the noise level of the transformer, especially if it will be installed in areas where noise may be a problem.
- specifications: It is important to evaluate parameters such as thermal load, insulation level and other technical characteristics to ensure that the transformer meets your requirements.
- reliability and durability: Research the manufacturer’s reputation and check user reviews to ensure the reliability and durability of the transformer you choose.
- cost and budget: Finally, consider the cost of the transformer and compare it with your budget to choose the most suitable option.
Selection of dry-type transformers requires careful analysis and evaluation of various factors to select the most suitable option for your project.
Equipment certification
Certification is usually carried out by standards bodies or accredited laboratories and ensures that products meet certain standards of quality, safety and performance. This helps ensure that transformers meet minimum operational and safety requirements.
Some of the possible certifications for dry-type transformers may include:
- ISO certification confirms product compliance with international quality and management standards.
- CE certification is mandatory for many products sold on the European Union market and confirms their compliance with European safety standards.
- in North America, transformers may require certification from organizations such as Underwriters Laboratories (UL) or the Canadian Standards Association (CSA).
- The International Electrotechnical Commission (IEC) also defines standards and requirements for electrical equipment, including transformers.
- Depending on the country or region, there may be national standards and requirements, as well as mandatory certifications and licensing for transformers.
Checking for certification before purchasing dry-type transformers can ensure they meet applicable standards and help avoid safety and performance problems in the future.
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