How to Improve the Drying Quality of Transformer Winding?

The drying quality of winding plays a decisive role in the performance and reliability of electrical equipment such as transformers. High-quality drying treatment can ensure good insulation performance and stable dimensions of the winding, thereby guaranteeing the safe and stable operation of the equipment during long-term operation. To achieve high-quality winding drying, multiple key factors need to be comprehensively considered and effective measures should be taken.

Content

● Precise Control of Drying Temperature
Drying temperature is one of the core elements affecting the drying quality of winding. An appropriate temperature can accelerate the evaporation of moisture in the insulating materials and improve the drying efficiency. However, if the temperature is too high, it may cause aging, even damage to the insulating materials. For example, for common oil-paper insulated winding, it is generally more appropriate to control the drying temperature within the range of 80 - 110 °C. Within this temperature range, moisture can vaporize and escape at a relatively ideal rate, and at the same time, it will not have a serious adverse impact on the performance of the insulating paper and insulating oil.

Advanced temperature sensors and intelligent temperature control systems can be used to monitor and precisely adjust the temperature inside the drying equipment in real time, ensuring that it is uniformly and stably within the set range, avoiding local overheating or excessive temperature fluctuations, thereby ensuring the performance integrity of the insulating materials during the winding drying process. This is applicable to the drying treatment ofwinding with different insulating materials and structures.

● Improvement of the Vacuum Degree of the Equipment
Increasing the vacuum degree of the drying equipment is another crucial step in improving the drying quality ofwinding. A high-vacuum environment can effectively reduce the boiling point of water, enabling moisture to vaporize and be extracted quickly at a lower temperature. When the vacuum degree reaches a certain level, the drying time can be significantly reduced and the drying effect can be improved. For example, when the vacuum degree is increased to the range of 100 - 10 Pa, the moisture removal efficiency can be greatly enhanced. High-quality vacuum pumps and sealing devices should be used to ensure good airtightness of the drying equipment and maintain a high vacuum state continuously.

Under high-vacuum conditions, the oxidation effect of components such as oxygen in the air on the insulating materials can also be reduced, further protecting the insulation performance. Especially for the drying of high-voltage and ultra-high-voltage winding with extremely high requirements for insulation performance, increasing the vacuum degree is more important, which helps to remove the deeply adsorbed moisture and improve the drying degree and stability of the insulation.

● Optimization of the Setting of Drying Time
The reasonable setting of drying time cannot be ignored for the drying quality ofwinding. If the time is too short, the moisture may not be completely removed, affecting the insulation performance; if the time is too long, it may cause energy waste and unnecessary thermal stress on thewinding. The drying time should be comprehensively determined based on various factors such as the material, size, initial moisture content of thewinding and the performance of the drying equipment.

Through preliminary experiments and experience accumulation, a drying time model for different types ofwinding can be established. During the drying process, combined with real-time monitored parameters such as temperature, vacuum degree and winding insulation resistance, the drying time can be adjusted dynamically to ensure that the ideal drying effect is achieved while avoiding potential risks caused by over-drying. This is applicable to the quality control and optimization in the large-scale winding drying production process.

● Strict Control of Pre-drying Preparation Work
Before winding drying, doing sufficient preparatory work has an important impact on the final drying quality. First, thewinding should be thoroughly cleaned to remove impurities such as oil stains and dust on the surface, preventing them from affecting the evaporation of moisture or polluting the insulating materials during the drying process. Secondly, a pre-inspection of thewinding should be carried out to ensure that their structures are complete and there are no short-circuit, open-circuit or other defects, avoiding drying failure or damage to thewinding due to internal faults during the drying process.

Moreover, thewinding should be placed reasonably inside the drying equipment to ensure that they are heated evenly and the vacuum environment acts sufficiently. Special winding supports and fixing devices can be used to make thewinding in the best drying state, laying a solid foundation for a high-quality drying process. This is applicable to the preliminary stage of all winding drying operations.

In Summary

Improving the drying quality ofwinding is a systematic project that requires the coordinated cooperation of multiple aspects such as precise control of drying temperature, improvement of equipment vacuum degree, optimization of drying time setting and strict control of pre-drying preparation work. In the process of winding manufacturing and equipment maintenance, only by comprehensively paying attention to and implementing these points and following scientific and reasonable drying processes and standards can high-quality drying treatment ofwinding be ensured, thereby enhancing the overall performance and operational reliability of electrical equipment such as transformers and meeting the growing high-quality requirements of power systems and industrial production.

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LuShan, est.1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single-phase transformer, three-phase isolation transformers,electrical transformer,distribution transformer, step down and step up transformer, low voltage transformer, high voltage transformer, control transformer, toroidal transformer, R-core transformer;DC inductors, AC reactors, filtering reactor, line and load reactor, chokes, filtering reactor, and intermediate,high-frequency products.

Our power transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering(furnace), central air conditioning.

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