A flashover or short circuit in a liquid-filled transformer is usually accompanied by overpressure in the tank due to gas being formed by the decomposition and evaporation of the oil. The pressure relief devices limit the tank's overpressure and reduce the risk of tank rupture and uncontrolled oil spills, which might also cause a fire. The valve disc has a low mass, and the closing springs have a low spring rate to permit fast and wide openings. The valve closes again once the overpressure is released.
Why Hitachi Energy?
- More than 50 years of experience in manufacturing transformer components
- The new generation of pressure relief devices with analog and digital output (eDevices)
- Global after-sales and customer support network
