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Recently, an advanced vacuum transformer oil purification system was installed, commissioned, and officially put into operation at a key substation in Mexico. This project, through deep purification of transformer insulating oil, effectively addressed the operational risks caused by oil deterioration in local substation equipment, significantly improving the stability and reliability of the power system. It represents another successful example of Chinese power technology services serving overseas markets.

Technology Enables Solutions to Operation and Maintenance Challenges

Due to their long service life and the high humidity of the local climate, some substations in Mexico experience a gradual accumulation of moisture, gas, and mechanical impurities in their transformer oil. This leads to decreased oil insulation strength and increased dielectric losses, affecting transformer operating efficiency and creating safety hazards. The vacuum transformer oil purification system, now in operation, integrates dual-stage vacuum separation and multi-stage precision filtration technologies. Through gradient vacuum environment construction and three-dimensional flash evaporation, it reduces the water content in the oil to below 5 ppm and the gas content to within 0.1%, achieving a filtration accuracy meeting NAS 1638 Class 5 standards. The equipment can operate online while energized, without interrupting the power supply. It ensures continuous power supply to the substation while simultaneously performing deep oil purification, significantly reducing operation and maintenance costs and downtime losses.

Intelligent and Efficient, Offering Multiple Benefits

This purification system is equipped with an intelligent PLC control system that can monitor key parameters such as vacuum, oil temperature, and oil pressure in real time. It enables one-button start/stop and automatic fault alarms, offering convenient operation and high safety. The system adopts an environmentally friendly chassis design, reducing waste liquid discharge. Combined with oil regeneration, it effectively reduces resource consumption and complies with local environmental policies in Mexico. After the project implementation, the insulation strength of the substation transformers has been significantly improved, the oil breakdown voltage has reached international standards, and the frequency of equipment maintenance has been reduced by more than 40%. It is expected to extend the service life of the transformers by 15-20 years, achieving a triple win in economic, social, and environmental benefits.