Transformer oil serves as the core insulating and cooling medium for oil-immersed power equipment. Prolonged operation can lead to issues such as increased acidity, excessive moisture, sludge accumulation, and reduced dielectric breakdown voltage due to oxidation, moisture ingress, and contamination. These problems not only degrade insulation performance but also corrode windings and insulation paper, significantly shortening the transformer's overall lifespan. While traditional oil replacement is costly and generates significant waste pollution, regenerative filtration has emerged as the industry's mainstream maintenance solution. Chongqing Tongrui Filtration Equipment Manufacturing Co., Ltd. has long specialized in transformer oil regeneration and purification; leveraging an integrated process, the company achieves deep restoration of aged insulating oil, meeting the energy-efficient maintenance needs of power grids, power plants, and substations.
Tongrui's transformer oil regeneration equipment integrates three core modules: two-stage high-vacuum flash dehydration and degassing, multi-stage precision filtration, and polymer-based adsorption for acid removal and decolorization. A two-stage vacuum pump system creates an ultra-high vacuum environment, which, combined with a 3D flash evaporation structure, rapidly removes dissolved and free water as well as fault-indicating gases like acetylene and hydrogen; residual moisture can be reduced to below 10 ppm, and gas content strictly complies with national standards. Progressive precision filter elements capture metal particles, free carbon, and solid sludge impurities with micron-level accuracy, eliminating the risk of conductive impurities forming electric field bridges. For heavily aged and acidified oil, the equipment features a dedicated adsorption-regeneration unit that uses polar adsorbent materials to neutralize organic acids and oxidized colloids while simultaneously decolorizing the oil and effectively reducing the dielectric loss factor. The treated oil's breakdown voltage can exceed 75 kV, fully meeting the GB/T 7595 standard for new oil.
The equipment employs multiple protection systems, including automatic temperature control, liquid level interlocking, and overpressure/overload protection. With stable and reliable electrical components, it supports offline circulation regeneration of stored oil as well as online processing without shutting down the transformer. Additionally, it can perform vacuum oil filling and transformer body drying, offering multi-functionality that reduces the need for additional on-site equipment. Compared to a complete oil replacement, Tongrui's regeneration process cuts oil-related costs by over 80% and reduces hazardous waste emissions. It is suitable for oil restoration across various applications-ranging from 110kV units to UHV main transformers, instrument transformers, and capacitors-and ensures stable operation even in high-altitude environments.
Leveraging mature technology and extensive on-site operational experience, Chongqing Tongrui focuses on oil regeneration to curb transformer insulation aging at the source and enhance grid stability. Balancing economic efficiency with environmental sustainability, the company provides essential equipment for the full lifecycle management of power assets.
