{"id":3125,"date":"2026-08-03T07:19:56","date_gmt":"2026-08-02T23:19:56","guid":{"rendered":"http:\/\/www.alikucukhoca.com\/blog\/?p=3125"},"modified":"2026-08-03T07:19:56","modified_gmt":"2026-08-02T23:19:56","slug":"how-does-the-winding-arrangement-affect-the-performance-of-an-oil-immersed-transformer-4771-ce96a0","status":"publish","type":"post","link":"http:\/\/www.alikucukhoca.com\/blog\/2026\/08\/03\/how-does-the-winding-arrangement-affect-the-performance-of-an-oil-immersed-transformer-4771-ce96a0\/","title":{"rendered":"How does the winding arrangement affect the performance of an oil – immersed transformer?"},"content":{"rendered":"

As a seasoned supplier in the oil-immersed transformer industry, I’ve witnessed firsthand the profound impact that winding arrangement has on the performance of these crucial electrical devices. In this blog, I’ll delve into the technical aspects of how different winding arrangements can transform the efficiency, reliability, and overall functionality of oil-immersed transformers. Oil Immersed Transformer<\/a><\/p>\n

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Understanding the Basics of Winding in Oil-Immersed Transformers<\/h3>\n

Before we explore the effects of winding arrangement, let’s briefly understand what windings are in an oil-immersed transformer. Windings are essentially coils of insulated wire that are wound around a magnetic core. The primary winding is connected to the input voltage source, while the secondary winding is connected to the load. The interaction between these windings, facilitated by the magnetic field in the core, is what enables the transformer to step up or step down the voltage as required.<\/p>\n

Types of Winding Arrangements<\/h3>\n

There are several types of winding arrangements commonly used in oil-immersed transformers, each with its own set of characteristics.<\/p>\n

Concentric Windings<\/h4>\n

Concentric windings are one of the most widely used arrangements. In this setup, the primary and secondary windings are arranged concentrically around the core. The secondary winding is usually placed on the outside, while the primary winding is inside. This arrangement offers several advantages.<\/p>\n

One of the key benefits is the reduced leakage reactance. Leakage reactance is the opposition to the alternating current due to the leakage flux that does not link both the primary and secondary windings. By having the windings tightly packed in a concentric manner, the magnetic coupling between the primary and secondary windings is improved, resulting in lower leakage reactance. This, in turn, leads to higher efficiency and better voltage regulation.<\/p>\n

Concentric windings also provide good mechanical stability. The compact design allows the windings to be firmly held in place, reducing the risk of movement during operation. This is particularly important in high-voltage and high-power applications where mechanical stress can be significant.<\/p>\n

Sandwich Windings<\/h4>\n

Sandwich windings, also known as interleaved windings, involve alternating layers of primary and secondary windings. This arrangement is designed to minimize the leakage inductance even further. By interleaving the windings, the mutual inductance between the primary and secondary is increased, and the leakage flux is reduced.<\/p>\n

The reduced leakage inductance in sandwich windings results in better performance at high frequencies. This makes them suitable for applications where the load has a high-frequency component, such as in some industrial processes or in power electronics. However, the construction of sandwich windings is more complex and expensive compared to concentric windings. The interleaving process requires precise alignment and insulation, which adds to the manufacturing cost.<\/p>\n

Impact on Transformer Efficiency<\/h3>\n

Efficiency is a critical factor in the performance of oil-immersed transformers. It is defined as the ratio of the output power to the input power, and it represents how effectively the transformer converts electrical energy from the primary side to the secondary side.<\/p>\n

The winding arrangement has a direct impact on efficiency through its influence on losses. There are two main types of losses in a transformer: copper losses and iron losses.<\/p>\n

Copper Losses<\/h4>\n

Copper losses occur due to the resistance of the winding conductors. When current flows through the windings, some of the electrical energy is dissipated as heat. The amount of copper loss is proportional to the square of the current and the resistance of the winding.<\/p>\n

A well-designed winding arrangement can help reduce copper losses. For example, using a winding arrangement with low leakage reactance, such as concentric windings, allows for a more efficient transfer of energy between the primary and secondary windings. This means that less current is required to achieve the same output power, resulting in lower copper losses.<\/p>\n

Iron Losses<\/h4>\n

Iron losses, also known as core losses, are caused by the alternating magnetic field in the core. There are two components of iron losses: hysteresis losses and eddy current losses.<\/p>\n

Hysteresis losses occur due to the repeated magnetization and demagnetization of the core material. Eddy current losses are caused by the induced currents in the core due to the changing magnetic field.<\/p>\n

The winding arrangement can indirectly affect iron losses. By reducing the leakage flux, the magnetic field in the core is more uniform, which can help reduce eddy current losses. Additionally, a balanced winding arrangement can minimize the distortion of the magnetic field, thus reducing hysteresis losses.<\/p>\n

Influence on Voltage Regulation<\/h3>\n

Voltage regulation is another important performance parameter of a transformer. It measures the ability of the transformer to maintain a constant output voltage under varying load conditions.<\/p>\n

The winding arrangement plays a crucial role in voltage regulation. A transformer with a low leakage reactance, achieved through a well-designed winding arrangement, will have better voltage regulation. When the load on the transformer changes, the voltage drop across the leakage reactance is minimized, allowing the output voltage to remain relatively stable.<\/p>\n

For example, in a transformer with concentric windings, the reduced leakage reactance ensures that the voltage at the secondary side does not fluctuate significantly with changes in the load current. This is essential in applications where a stable voltage supply is required, such as in sensitive electronic equipment or in grid-connected power systems.<\/p>\n

Effect on Short-Circuit Performance<\/h3>\n

Short-circuit is a severe fault condition that can occur in a transformer. During a short-circuit, a large current flows through the windings, which can generate significant mechanical forces and heat.<\/p>\n

The winding arrangement affects the short-circuit performance of a transformer. A robust winding design can withstand the mechanical stresses caused by short-circuit currents. For instance, concentric windings, with their compact and stable structure, are better able to resist the radial and axial forces generated during a short-circuit.<\/p>\n

In addition, the winding arrangement can also influence the short-circuit impedance. A proper winding arrangement can ensure that the short-circuit impedance is within an acceptable range, which helps to limit the short-circuit current and protect the transformer from damage.<\/p>\n

Considerations for Different Applications<\/h3>\n

The choice of winding arrangement depends on the specific requirements of the application.<\/p>\n

For distribution transformers, which are used to supply power to residential and commercial areas, efficiency and voltage regulation are of primary importance. Concentric windings are often the preferred choice due to their low leakage reactance and good mechanical stability, which result in high efficiency and stable voltage output.<\/p>\n

In industrial applications, where the load may have a high-frequency component or require a high degree of reliability, sandwich windings may be more suitable. Their low leakage inductance makes them better suited for high-frequency operation, and the increased mechanical stability can enhance the reliability of the transformer in harsh industrial environments.<\/p>\n

Contact Us for Your Transformer Needs<\/h3>\n

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As an experienced oil-immersed transformer supplier, we understand the importance of choosing the right winding arrangement for your specific application. Our team of experts can work with you to design and manufacture transformers that meet your exact requirements. Whether you need a transformer for a small-scale residential project or a large industrial installation, we have the expertise and capabilities to deliver high-quality products.<\/p>\n

Substation Transformer<\/a> If you’re interested in learning more about our oil-immersed transformers or would like to discuss a potential project, please don’t hesitate to contact us. We look forward to the opportunity to work with you and provide you with the best transformer solutions.<\/p>\n

References<\/h3>\n