Excellent Insulation Performance of Oil-Immersed Transformers

Oil-immersed transformers are essential components in power systems, and their excellent insulation performance is crucial for ensuring the reliable operation of the system. This article focuses on discussing the key factors that contribute to the excellent insulation performance of oil-immersed transformers.


Selection of Insulation Materials:

The insulation performance of oil-immersed transformers heavily relies on the selection of appropriate insulation materials. Common insulation materials include insulating oil and insulating paper. Insulating oil is a vital dielectric medium in transformers, offering excellent electrical insulation properties and heat dissipation capabilities. Insulating paper is widely used for winding insulation and possesses good mechanical strength and insulation performance.


Maintenance of Oil Quality:

Maintaining the quality of the insulating oil is critical for ensuring excellent insulation performance. Regular monitoring of oil characteristics, such as electrical breakdown strength, dielectric loss factor, and dissolved gas content, helps detect changes and contamination in the oil. Measures such as oil filtration, purification, or replacement should be implemented when necessary to ensure the cleanliness and electrical insulation properties of the insulating oil.


Sealing of the Insulation System:

Proper sealing of the insulation system is vital for maintaining excellent insulation performance. Transformers should be equipped with effective sealing structures to prevent oil leakage and the ingress of external contaminants. Regular inspection and maintenance of the integrity of sealing structures, along with timely replacement of worn-out seals, ensure a stable internal environment and the safety of the insulation system.


Monitoring and Testing of Insulating Media:

Regular monitoring and testing of the insulating media in oil-immersed transformers are crucial maintenance measures for maintaining excellent insulation performance. Common monitoring methods include insulating oil sampling and analysis, measurement of the dielectric loss factor, and detection of partial discharge. These tests help identify insulation aging, contamination, or potential faults at an early stage, allowing for appropriate maintenance and repair actions to sustain the insulation performance.


Insulation System Maintenance:

Regular maintenance activities are essential for preserving the excellent insulation performance of oil-immersed transformers. These activities include oil sampling and replacement, inspection and replacement of insulating paper, as well as cleaning and drying of the insulation system. By conducting regular maintenance, the service life of insulation materials can be prolonged, ensuring continuous and reliable insulation performance.


The excellent insulation performance of oil-immersed transformers is a critical factor in maintaining the reliable operation of power systems. By selecting suitable insulation materials, maintaining the quality of the insulating oil, ensuring proper sealing of the insulation system, and implementing regular monitoring and maintenance practices, the insulation performance of transformers can be optimized. Regular maintenance activities help extend the service life of insulation materials, contributing to enhanced reliability and reduced risk of failures in oil-immersed transformers.

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