HOPU ZYD-150 Double Stage Vacuum Transformer Oil Purifier set out from the Chongqing factory, and arrived in Gaborone, the capital of Botswana. After 72 hours of uninterrupted operation, the oil and water content of 20t aged transformer at the customer's site decreased from 98 ppm to 2.8 ppm, the gas content from 8% to 0.08%, and the breakdown voltage increased from 28 kV to 78 kV. It passed the acceptance of Botswana National Power Corporation (BPC) at one time and was officially put into operation in the 220 kV substation. This marks the vivid footnote of the "Made in China" ZYD series oil purification machine once again writing a "new life for old oil" on the African continent.

Project Background - The "Old Oil" Crisis is Urgent and Urgent

Morupule B substation in Botswana is responsible for 70% of the power supply in the capital. For three consecutive years of high temperature and drought, transformer oil has been severely oxidized, and water, gas, and impurity indicators are in urgent need. BPC has considered replacing the entire batch of new oil, but due to foreign exchange quotas and a 4-month delivery cycle, it can only seek an "on-site regeneration" solution. After multiple rounds of international bidding, Chongqing HOPU Filtration Plant Company’s ZYD series double stage vacuum oil purifier won the bid with its combination of "dual stage high vacuum+three-dimensional flash evaporation+nanoscale filtration" technology and trailer type structure that can work continuously in a high temperature environment of 50 ℃.

Technical Highlights - Bipolar Vacuum, Triple Effect Integration

1. Dehydration: Double stage Roots pump+thin film evaporation, ultimate vacuum ≤ 5Pa, minimum moisture content can reach 2ppm;

2. Degassing: Three dimensional flash evaporation tower, oil film thickness of 0.3mm, residence time extended by 3 times, gas content<0.1%;

3. De clutter: Five level gradient filtering, β≥ 1000@1 μm， Particle size reaches NAS level 3;

4. Regeneration: Optional ion reaction tank can remove acidic components and free carbon, restore oil color to 0.5 (ASTM);

5. Intelligence: PLC+IoT module, real-time viewing of moisture, gas content, temperature, and flow rate through mobile app, supports bilingual communication in Chinese and English.

Customer Voice - a senior electrical engineer of Botswana State Power Company, said: "The original budget for purchasing new oil was 550000 dollars, but now it only costs 98000 dollars to complete regeneration, saving 450000 dollars, and it also delivers power three months in advance. The noise of ZYD transformer oil purification machine is lower than 75dB, and the on-site communication can be normal. The trailer design allows us to use it in turn in six substations across the country, a real Mobile Hospital for Oil! ”

From Chongqing to Gaborone, ZYD series double stage vacuum oil purification machine has won trust with their data and strength. In the future, we will continue to deeply cultivate markets in Africa, with the mission of "making every drop of oil circulate", to safeguard global energy decarbonization and the healthy operation of transformers. Old oil never stops, new life is just in time.