What are the purposes of transformer winding drying?

TransformerWinding are a crucial component of electrical equipment such as transformers, and their performance is directly related to the operational reliability and safety of the entire equipment. Winding drying is an extremely important treatment process with several key purposes. The specific purposes are as follows:

Content

● Improving electrical insulation strength
Under normal circumstances, the insulating materials in windings contain a certain proportion (6% - 8%) of moisture. Under the action of an electric field, this moisture will ionize and conduct electricity, forming leakage current paths, thereby reducing the resistivity of the insulating materials and severely weakening their electrical insulation performance. When the equipment operates at a high voltage, the moisture-absorbed insulating materials may be unable to withstand the electric field strength, resulting in partial discharge or even breakdown phenomena, which can lead to short-circuit faults in the equipment.

Through the drying treatment, the moisture in the insulating materials can be effectively removed, significantly increasing their resistivity and enhancing the ability of the insulating materials to withstand high voltages. This ensures that the windings can operate safely and stably under the rated voltage and certain overvoltage conditions. This is especially important for the windings of high-voltage and ultra-high-voltage transformers.

● Stabilizing material dimensions
After the insulating materials absorb moisture, their molecular structures will change due to the intrusion of moisture, which will then lead to an expansion in thickness. In windings, such dimensional changes will directly affect the axial dimensional accuracy of the windings. On the one hand, it may change the tightness of the windings and affect their mechanical stability. On the other hand, for some electrical equipment with strict requirements for spatial dimensions, such as compact transformers or motors with special structures, changes in winding dimensions may lead to the inability to assemble the equipment normally or cause internal structures to rub against or collide with each other during operation, damaging the winding insulation and other components.

The drying treatment can remove moisture, allowing the insulating materials to return to their normal dimensional state and remain stable during subsequent operation, ensuring the structural integrity and reliability of the windings and the entire equipment.

● Preventing the acceleration of insulation aging
Moisture is one of the important factors that cause the aging of insulating materials. In a humid environment, moisture will react chemically with certain components in the insulating materials, such as hydrolysis reactions, which will destroy the molecular chain structures of the insulating materials and gradually cause them to lose their original insulation performance and mechanical strength.

Insulating materials that have been damp for a long time will become hard and brittle and are prone to cracking and peeling, greatly shortening their service life. Drying the windings can reduce the erosion of the insulating materials by moisture, delay the insulation aging process, extend the service life of the windings and the equipment, reduce equipment maintenance costs and replacement frequencies, which is of great significance for electrical equipment that operates in complex environments for a long time.

In Summary

Combining the above purposes of improving electrical insulation strength, stabilizing material dimensions, and preventing the acceleration of insulation aging, the ultimate purpose of winding drying is to ensure that electrical equipment can operate stably and reliably throughout its service life cycle. Whether it is large transformers in power systems or various motors in industrial production, the windings after drying treatment can reduce the downtime caused by insulation problems, improve the continuity of power supply and the efficiency of industrial production, reduce economic losses and safety risks caused by equipment failures, and ensure the smooth operation of the entire power network and industrial production process.

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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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