air power transformer

Often, when it comes toair power transformer, people think about something simple and understandable. And this is usually a mistake. Despite the apparent simplicity of their design, these devices have many nuances that can significantly affect their reliability and efficiency. Many people believe that it is enough to select the right parameters, and then everything will work stably. But the reality is often much more complicated. Having seen everything in my life, I have been convinced of this more than once.

Main problems in design and selectionair power transformer

Let's start from the very beginning - design. Not all designers take into account a complex of factors. Of course, it is important to determine the required power, voltage, and frequency. But it is equally important to choose the right type of magnetic core, winding material, and cooling system. Otherwise, even if all nominal parameters are observed, the transformer will begin to overheat, which will inevitably lead to a reduction in service life and, ultimately, to its failure. There was a case when, due to the wrong choice of insulation material, breakdowns occurred in the transformer, although all other parameters were normal. Fortunately, this was prevented, but it took a lot of time and effort.

The role of the environment cannot be underestimated.Overhead power transformerworks outdoors, so it is exposed to precipitation, dust, and pollution. This leads to the formation of condensation on the windings, corrosion and a decrease in insulating properties. Therefore, it is extremely important to provide reliable protection from external factors - the use of a special coating, sealing the housing, installing a ventilation system.

And, of course, don’t forget about vibrations. The transformer may vibrate due to fans, wind or other external influences. Vibration leads to weakening of winding connections, destruction of insulation and interference with equipment operation. Therefore, it is necessary to provide vibration isolation for the transformer housing.

The importance of choosing the right winding material

The choice of material for windings is a separate big topic. We often come across situations where they choose aluminum windings, believing that it is cheaper than copper. This is not always the case. Aluminum has lower conductivity, so to achieve the same power requires a larger winding area, which increases the weight and dimensions of the transformer. In addition, aluminum windings have poorer dielectric properties, which can lead to increased heating.

In most cases, forair power transformerIt is preferable to use copper windings, although it is more expensive. Copper has higher conductivity and dielectric strength, which reduces losses and increases the reliability of the transformer. But here it is important to take into account the specific task. For transformers with very high power, special copper alloys with additives can be used to increase their strength and resistance to overheating.

And so, we had a project for an industrial enterprise, where they initially decided to use aluminum windings for reasons of economy. As a result, the transformer overheated, and it had to be converted to copper. This, of course, required additional costs, but in the long run it was cheaper than repairs and downtime.

Cooling systemsair power transformer: selection and features

Cooling is perhaps the most important aspect of the design.air power transformer. The service life and reliability of the device directly depends on the efficiency of the cooling system. There are several main types of cooling systems: air, oil and combined.

Air cooling is the simplest and cheapest option. It consists of blowing air through the windings using fans. This type of cooling is suitable for small power transformers. However, it is less efficient than oil cooling and can lead to overheating under high loads.

Oil cooling is a more efficient and reliable option. It consists of cooling the windings with oil, which circulates through a special circuit. The oil removes heat from the windings and releases it in the radiator. Oil cooling is suitable for high power transformers.

Combined cooling combines the advantages of air and oil cooling. In this case, the windings are cooled by oil, and the oil is discharged to the radiator using fans. This reduces the energy consumption of the cooling system and increases the efficiency of the transformer.

Oil cooling problems

Despite its effectiveness, oil cooling also has its disadvantages. Oil decomposes over time and loses its properties, so it is necessary to regularly analyze and replace it. In addition, oil can pollute the environment if it leaks. Therefore, it is necessary to provide a reliable system for protecting against oil leaks.

In practice, we often encounter problems related to oil quality. Sometimes oil is used that does not meet technical specifications. This leads to a decrease in cooling efficiency and accelerated wear of the windings. Therefore, it is important to use only high-quality oil recommended by the transformer manufacturer.

In one of the projects, we encountered the problem of oil contamination with metal particles. This resulted in increased electrical resistance of the oil and a decrease in its ability to dissipate heat. I had to clean the oil and replace the filters. It took a lot of time and effort, but in the end it was possible to restore the efficiency of the cooling system.

Control and monitoring of parametersair power transformer

Regular control and monitoring of parametersair power transformer– this is a necessary condition for its reliable and durable operation. It is necessary to regularly measure voltage, current, winding and oil temperatures, and visually inspect the transformer for damage. Modern monitoring systems make it possible to collect data on transformer parameters in real time and analyze them. This allows you to identify problems in a timely manner and prevent emergency situations.

The use of temperature and pressure sensors allows you to monitor the condition of the transformer and detect overheating and oil leaks. Oil analysis systems allow you to assess its quality and promptly replace it. Winding condition monitoring systems allow you to identify defects and prevent damage.

Nowadays, remote monitoring systems are becoming increasingly common, which allow you to monitor the condition of the transformer from anywhere in the world. This is especially important for transformers located in hard-to-reach places.

Conclusions and recommendations

So,air power transformeris a complex device that requires careful design, proper selection of materials and a reliable cooling system. You should not skimp on the quality of components and pay insufficient attention to control and monitoring of transformer parameters. Only in this case can its reliable and durable operation be ensured.

I recommend when choosingair power transformerpay attention to the following factors: power, voltage, frequency, type of magnetic core, winding material, type of cooling system, presence of a monitoring system. And, of course, do not forget about the reliability of the manufacturer and the availability of service support.

Wenzhou Qiaonasen Electrical Equipment Co.,Ltd

https://www.qnasen.ru/

Specializing in solutions for high and low voltage transmission and distribution and electrical control systems in the power equipment industry.