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Why is it essential to have a transformer supplier really close to you?


In the world of electrical components, the word "proximity" takes on a meaning that goes far beyond mere geographic proximity. Being close to the customer means understanding their needs, anticipating their requirements, and offering customized solutions that solve real problems. At SVT, this is the philosophy that guides every decision we make.


Amazon has revolutionized the concept of service, demonstrating that logistics can be a competitive advantage. But in the electrical transformer industry, logistics is not just about speed of delivery: it's also technical response capacity, design flexibility And constant supportA "close" supplier is one that understands the specifics of each application, communicates with the customer, and supports and advises them through every phase of the project. Every electrical transformer has unique characteristics. Whether for industrial automation, home automation, residential systems, or special applications, the right transformer isn't always a standard one.


At SVT, we design and manufacture single-phase, three-phase, toroidal, switching transformers, and custom power supplies, starting from the customer's specific needs. Our experience allows us to offer reliable technical solutions, optimized for every operating context and compliant with IEC 61558, IS 365 (for the railway sector), and the RoHS 3 and Reach directives.


Being close also means being present. Our technical and sales team is always available for consultations, personalized quotes, and after-sales assistance. We don't just sell a product: we build relationshipsEvery transformer that leaves our facility is the result of dialogue, discussion, and shared planning.


At SVT, we believe that quality lies not only in the materials, but also in the way we interact with our customers. Our closeness translates into:


  • Custom design: each item is customized according to specific requests;
  • Production flexibility: we are also able to produce small series or prototypes;
  • Direct technical assistance: you speak to competent people, not call centers;
  • Optimized delivery times: thanks to an internal supply chain and efficient logistics.


    • In conclusion, choosing SVT means choosing a partner who knows you, listens to you, and supports you. We are not just a transformer manufacturer: we are close to your needs, everyday.


Choosing inverter inductors: what to consider



In photovoltaic systems, the use of inverters is essential. However, it is equally important to protect the inverter and the entire system from disturbances that may arise from the electrical grid. An effective way to do this is to insert a choke. This solution helps filter disturbances and ensure stable and safe operation of the photovoltaic system. In this article, we will explore the various factors to consider when choosing inverter chokes, taking into account aspects such as voltage, frequency, and project specifications.

When choosing a choke for an inverter, the rated voltage is one of the first factors to consider. It is crucial that the choke is not susceptible to overload or overheating. To ensure an adequate safety margin, the choke's rated voltage should be slightly higher than the inverter's output voltage. This helps prevent operational problems and extends the component's lifespan.

Another essential parameter in choosing an inductor is the operating frequency. Inverters operate at different frequencies, and the inductor must be designed to operate properly at that specific frequency. It is important to choose an inductor value appropriate for the inverter's operating frequency. An inadequate inductor value can compromise the inverter's performance, negatively impacting the system's efficiency and stability.

The inverter design specifications directly influence the choice of inductor. For example, the load current is a crucial aspect to consider: the inductor must be able to handle the expected current without saturating. Saturation of the inductor could cause malfunctions and damage the system. Furthermore, the physical dimensions of the inductor must be compatible with the inverter circuit layout. It is essential that the inductor be small enough to be mounted in the circuit without problems, yet large enough to dissipate the heat generated.

The quality of the materials used to construct the inductor is another important factor to consider. Our inductors are made with high-quality magnetic materials and durable windings, ensuring longer life and stable performance over time. Investing in quality inductors can reduce the need for long-term maintenance and replacement, helping improve the overall reliability of the system.

Choosing inverter chokes requires a careful and thoughtful evaluation of various factors. By considering rated voltage, operating frequency, project specifications, and material quality, we can help you select the most suitable choke for your application to ensure the proper operation and efficiency of your inverter. A thoughtful and well-considered choice can significantly contribute to the stability and reliability of your system over the long term.


Toroidal Transformers vs. Traditional Transformers: A Detailed Comparison


In the world of electrical systems and electronics, choosing the right transformer is essential to ensure efficiency and safety. Two of the most common types of transformers are toroidal transformers and traditional (laminated-core) transformers. In this article, we will provide a detailed comparison of these two technologies, analyzing their advantages, disadvantages, and most common applications.

Toroidal transformers are electronic devices featuring a toroidal (ring)-shaped magnetic core. This configuration offers a number of advantages over traditional transformers, including greater efficiency and lower electromagnetic interference. Toroidal transformers are often used in applications where space and signal quality are critical.

Traditional transformers, often known as lamination transformers, consist of a core of silicon steel laminations stacked to form an E- or U-shaped structure. These transformers are widely used for their robustness and reliability. Thanks to their simple and proven construction, traditional transformers are widely used in many applications. However, they have some limitations, such as their relatively large size and the magnetic losses that occur at the junctions between the laminations. Below, we detail the advantages of each configuration:


Advantages of toroidal transformers

  • Energy efficiency: toroidal transformers have lower magnetic flux dispersion, which translates into greater efficiency, at the same power;
  • Compact size: the toroidal shape allows for a more compact design, saving space in devices;
  • Reduced electromagnetic interference (EMI): the toroidal configuration reduces the emission of electromagnetic interference, improving signal quality;
  • Less buzz: Toroidal transformers produce less acoustic noise than traditional transformers.



Advantages of traditional transformers

  • Robustness: Laminated core transformers are known for their durability and resistance to harsh operating conditions;
  • Lower cost: for the same power output, traditional transformers, being more standard, tend to be less expensive than toroidal transformers;
  • Wide availability: Traditional transformers are widely available and used in many standard applications;
  • Lower inrush currents: in a toroidal transformer the inrush currents can reach quite high values and this, increasing with power, can represent a problem, while traditional transformers do not have this criticality.


Generally speaking, toroidal transformers are used in audio equipment, low-noise power supplies, measuring instruments, and medical devices, while traditional transformers are widely used in industrial equipment, household appliances, emergency power supplies, and photovoltaic systems.

In conclusion, both traditional and toroidal transformers have their strengths and weaknesses. Choosing the most suitable transformer type depends on specific application needs and design constraints. With a clear understanding of the differences between these two types of transformers, we can help you make an informed choice that maximizes the efficiency and performance of your electrical or electronic system.


Motor Starter Reactors: Advantages, Applications, and Practical Advice


Motor starting reactors are essential components in industrial systems and electrical applications. These devices help reduce inrush current, thus improving motor life and overall system safety. In this article, we'll explore the benefits of motor starting reactors, their main applications, and provide some practical tips on how to choose the right one for your needs.

One of the main advantages of motor starting reactors is their ability to reduce inrush current. When a motor is started, the initial current can be up to ten times higher than the rated current. This high current can damage motor and electrical system components. Reactors limit this initial current, reducing stress on components and increasing motor life.

In addition to reducing inrush current, motor starting reactors also improve system stability. By minimizing current spikes and line phase shifts, voltage fluctuations are reduced, ensuring smoother and more reliable motor operation, thus significantly reducing energy bills. This is particularly important in industrial applications where system stability is crucial to avoiding outages and failures.

Motor starting reactors are used in a wide range of industrial and commercial applications. Some examples include:

  • pumping systems: reactors are used to start electric pumps, reducing component wear and improving operating efficiency;
  • compressors: in air compression systems, reactors help avoid current surges that could damage compressors and electrical circuits;
  • conveyor belts: in industrial conveyor systems, reactors ensure a smooth and controlled start-up, preventing overloads and damage to equipment;
  • large industrial engines: Reactors are used to start high-power motors in applications such as fans, mills and machine tools, ensuring safe and reliable operation.

When choosing a motor starter reactor, it's important to consider several factors to ensure the right choice. Here are some practical tips:

  • evaluate the inrush current: Make sure the reactor is sized correctly to handle the motor's expected inrush current. A reactor that is too small may not be effective, while one that is too large may result in excessive costs.
  • consider the type of engineDifferent types of motors may require specific reactors. Consult the motor specifications and manufacturer's recommendations to determine the most appropriate reactor.
  • evaluate the available spaceThe physical dimensions of the reactor are important for easy installation. Make sure there is enough space to mount the reactor in the system without any problems and to ensure proper operation.

In conclusion, motor starting reactors are essential components for improving the efficiency and safety of motorized systems. By reducing inrush current and improving system stability, reactors help extend the life of motors and reduce the risk of failure. By carefully considering the benefits, applications, and practical advice provided in this article, you can choose the right reactor for your needs and optimize the operation of your motors. If you need further technical support, write to us at info@svtsas.it.

The reactors we produce are made exclusively with high-quality, reliable, and certified components.


Can you always convert a three-phase voltage to a single-phase voltage?

It is often necessary to convert a three-phase supply voltage to a single-phase voltage. Is this always possible?

The answer is yes, and there are several possible solutions. One of the most economical options is to use a three-phase transformer, supplied with 400V three-phase power, with 230V taken at the output between one of the phases and neutral. Bear in mind that with this type of electromechanical solution, the system will always be unbalanced: one phase will carry twice the load of the other two. Therefore, if a balanced output load is required, the balance must be achieved electronically using a PLC. It is not possible to balance the system even by using three single-phase transformers connected together in delta or star instead of a three-phase transformer. In fact, this solution only results in lower efficiency and greater weight compared with using a single three-phase transformer.

Can an autotransformer be used in this case?

No. An autotransformer can only be used when a voltage change is required within a three-phase-to-three-phase or single-phase-to-single-phase system, not in mixed configurations combining the two.

And how can I convert a single-phase voltage to a three-phase voltage?

Single-phase means one phase; three-phase means three separate phases. It is not possible to “create” three separate phases from a single phase, so unfortunately there is currently no solution to this problem.

How to choose the right electrical transformer for your application?


Electrical transformers are devices that allow electrical energy to be transferred from one circuit to another. These devices are essential for electrical energy distribution as they allow voltage and current to be adjusted to suit different uses.

There are various types of transformers, and choosing the right one for your needs can be a daunting task: is a toroidal transformer or a traditional transformer better? Do you need an isolation transformer, or will an autotransformer suffice? Do you need a three- to single-phase transformer, or will a standard three-phase transformer suffice? And how do I go from a single-phase 230V voltage to a three-phase 400V voltage?

Let's try to identify some guidelines that can help you choose the transformer (or autotransformer) best suited to your needs.

It's good practice to always place a transformer upstream of your device to isolate the grid from the load, thus protecting the load from any voltage surges and variations that may occur on the grid side. In a transformer, the primary circuit is galvanically separated from the secondary circuit, so the two circuits are completely separated. Conversely, if only a voltage change is required because the load is already completely disconnected from the grid, an autotransformer may be sufficient, offering significant savings both in terms of cost and size, while maintaining the same power.

Three- and single-phase transformers are a special type of separation transformer, featuring a three-phase input and a single-phase output. However, this type of solution does not resolve the phase balancing (which must therefore be done differently, through electronic control), as one phase will always be loaded twice as hard as the other two. Therefore, it's better to use a standard three-phase transformer, drawing 230V between one phase and the neutral.

Toroidal transformers have a higher efficiency but also a higher cost for the same power, compared to a traditional lamellar transformer: they are normally used when there is a need to reduce size and weight, or when there are specific needs in terms of containing noise or leakage currents, as may be the case in the case of power transformers for audio or in the electromedical field.

Ferrite switching transformers, high frequency windings and high voltage transformers deserve a separate chapter, and we might write a separate article about them.

For any specific needs relating to your application, write to us at info@svtsas.it and we will be happy to advise you on the most suitable solution for your application!


How to reduce the size and bulk of electrical transformers?

Electrical transformers are static electrical machines that operate on alternating current and are based on the phenomenon of electromagnetic induction. They are essential in most of the electronic devices we use because they transform voltage to enable the proper functioning of the appliances and machinery needed for our daily work.

Transformers can also be classified by size. We find mega transformers (1,000 MVA), large transformers (up to 2 MVA), grid transformers (up to 1,600 kVA), and small transformers (up to 16 kVA).

In general, is it always possible to reduce the size and weight of the electrical transformers used?

The answer depends primarily on the operating frequency: if the operating frequency is 50/60 Hz, the only way to try to keep dimensions and weight down is to use toroidal transformers instead of traditional lamellar transformers.

Conversely, if it's possible to operate at a higher frequency, the higher the operating frequency, the smaller the windings can be used. However, the higher the operating frequency, the greater the need for higher-performance ferromagnetic cores (i.e., iron powder materials, Kool Mu, and Mu-metal), and the greater the electromagnetic compatibility issues that will arise.


The environmental impact of electrical transformers: challenges and opportunities for a sustainable future.

Electrical transformers, key components for the distribution and use of electricity, can have a significant environmental impact throughout their life cycle. In this article, we analyze the main environmental challenges related to electrical transformers and the opportunities for a more sustainable future.


Environmental challenges:

  • Energy consumption: Energy losses during electrical transformation result in greenhouse gas emissions and increased resource consumption;
  • End of Life: Improper disposal of obsolete transformers can release harmful substances into the environment.


Opportunities for sustainability:

  • Eco-sustainable materials: Development of biodegradable and recyclable alternatives;
  • Energy efficiency: Improving design and technologies to reduce energy losses during processing;
  • Circular economy: Implementation of recycling and reuse systems for end-of-life transformer components.


Examples of innovations:

  • Dry-type transformers: Eliminate the use of mineral oil, reducing the risk of pollution and increasing safety;
  • Smart Transformers: Real-time performance monitoring to optimize energy efficiency and reduce losses;
  • Component Recycling: Recovery of copper and other materials for the production of new transformers.

The electrical transformer industry is making significant strides to reduce its environmental impact. The adoption of eco-friendly materials, efficient technologies, and circular economy models will contribute to a more sustainable future for the electricity sector.

Case studies: the use of electrical transformers in various applications.

Learn how electrical transformers are used in various industries, from electricity distribution to powering electronic devices.

Electrical transformers are essential components in a wide range of applications, from power distribution to supplying electronic devices. In this article, we look at several case studies illustrating the use of electrical transformers in different sectors.


Case study 1: Transformers for power distribution

  • Application: An electricity distribution company needs a new transformer to increase the voltage on a key power line.
  • Solution: Installation of a high-power transformer with an oil cooling system to ensure reliable and safe operation.
  • Benefits: Improved energy efficiency, reduced power losses and increased distribution capacity.


Case study 2: Transformers for industry

  • Application: An industrial facility needs a transformer to power new high-power machinery.
  • Solution: Installation of a dry-type transformer with a compact, robust design tailored to the facility's specific requirements.
  • Benefits: Greater safety in an industrial environment, reduced fire risk and lower maintenance costs.


Case study 3: Transformers for consumer electronics

  • Application: A smartphone manufacturer needs a miniature transformer to charge the device's battery.
  • Solution: Development of an integrated transformer with an innovative design and high energy efficiency.
  • Benefits: Improved device reliability, faster charging times and reduced size.


These case studies demonstrate the versatility and importance of electrical transformers in a range of applications. The use of efficient, reliable transformers is essential to ensuring safety, continuity of service and energy sustainability across a variety of sectors.

New technologies in electrical transformers: innovations for a more efficient and sustainable future.

Innovations in electrical transformers improve efficiency, reliability, and sustainability. Discover new technologies and their benefits.

Electrical transformers are essential components in any electrical system, converting voltage from one level to another. In recent years, the transformer industry has seen a wave of innovations aimed at improving the efficiency, reliability, and sustainability of these devices. Let's take a closer look at some of them:


  • Advanced magnetic materials: new metal alloys with improved magnetic properties reduce energy losses and improve heat dissipation;
  • Innovative insulation systems: more efficient insulating materials increase the safety and lifespan of transformers;
  • Intelligent power electronics: the integration of sensors and intelligent control systems allows real-time monitoring of transformer performance and optimized management of the device where it is installed.


The advantages are many:

  • Better energy efficiency: Reduction of energy consumption (and consequently of CO2 emissions), with a positive impact on the environment and on operating costs;
  • Greater reliability: Reduced risk of breakdowns and reduced machine downtime, for greater safety and continuity of service;
  • Advanced sustainability: the new materials used reduce the environmental impact of end-of-life transformers.
  • Intelligent Transformers: Real-time monitoring of operating conditions, advanced diagnostics and optimized automatic adjustment of operating voltage;
  • Dry type transformersElimination of insulating oil, for greater safety and lower environmental impact.


New technologies in electrical transformers are paving the way for a more efficient, reliable, and sustainable future. The adoption of these innovations will help reduce the electricity sector's environmental impact and improve the quality of distributed energy.

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