India's First 400 kV Ester Fluid Transformer

New Delhi, Jul 15 (PTI) Hitachi Energy on Wednesday said that it has flagged off India's first 400 kV class three-phase synthetic ester fluid-filled power transformer for Power Grid Corporation of India.

This occasion marks a significant milestone in sustainable, high-performance power solutions, a company statement said.

According to the statement, engineered for future-ready performance, these transformers operate at higher temperatures, support greater load capacities, leading to reduced operational costs, superior energy efficiency, and safety from fire hazards which could get triggered at that temperature.


The ester fluid-filled transformer stands out as the largest-of-its-kind in India, both in terms of kV class and MVA rating, and reinforces Hitachi Energy's leadership in advanced, eco-conscious technology along with enhanced safety.

Developed and manufactured entirely based on Hitachi Energy's Trafostar global platform and at the power transformers manufacturing facility in Maneja, Vadodara, the 315 MVA rating transformer represents a significant stride toward ‘Atmanirbhar Bharat' in the energy sector.

Ester fluid, with a high flash point of 330°C, significantly reduces fire hazards in the transformer. Its biodegradable fluid minimizes environmental risks, making it an ideal choice for sensitive or high-density installations.