Hitachi Energy tests 765 kV ester transformer
The world’s first 765 kV ester-filled transformer sets new safety and environmental standards for ultra-high-voltage AC grids.
Image credit: Hitachi Energy
Switzerland, Zürich: Hitachi Energy has successfully tested the world’s first 765 kV / 400 kV, 250 MVA single-phase transformer using natural ester insulation fluid, marking a major step in safe and sustainable power transmission.
Designed under the company’s TrafoStar technology platform, the transformer replaces traditional mineral oil with biodegradable natural ester, offering a higher flash point and self-extinguishing properties, significantly enhancing fire safety and environmental protection.
This transformer is the largest at its voltage and power level to use ester fluid, positioning it as a benchmark for sustainable innovation in ultra-high-voltage AC systems. A typical 765 kV transformer can supply power to a city of 250,000 people, making its safety and reliability critical.
The ester used is biodegradable within 28 days, reducing the environmental risk from leaks. Safety is further enhanced by Hitachi Energy’s TXpand™ rupture-resistant design.
The 765 kV AC voltage level is vital in grid systems across North and South America, South Africa, and Asia, where long-distance transmission and high capacity are essential. Hitachi Energy has delivered ester-filled transformers to over 40 countries, supporting the global energy transition with over 30,000 transformers produced to date.
Source: Hitachi Energy
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