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Pressure relief device for power transformers

Sudden and violent short circuits inside the oil-cooled transformer’s metal tanks instantly generate an enormous amount of gas, which causes a substantial increase in internal pressure. If the pressure cannot be externally discharged, there is a danger that the transformer could explode and potentially cause harm and damage.

In case of a sudden and uncontrolled increase in pressure inside the transformer, the pressure relief device allows the insulating fluid to be discharged in milliseconds. Our pressure relief devices significantly improve transformer reliability and safety.

Why Hitachi Energy?

  • More than 50 years of experience in manufacturing transformer components 
  • Global after-sales and customer support network

Pressure relief device for power transformers' product scope:

  • Liquid-filled power transformers
  • For IEC and IEEE markets
Pressure relief devices

Pressure Relief Valves and Devices

Hitachi Energy's Pressure Relief Valves and Devices limit the tank's overpressure and reduce the risk of tank rupture and uncontrolled oil spills, which might also cause a fire. Learn more.
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Measurement and Monitoring Devices

Hitachi Energy provides a comprehensive range of measurement and monitoring devices to secure your transformers' reliable and safe service conditions. Learn more.
Hitachi Energy Power Transformers


Hitachi Energy offers distribution and power transformers, Dry-type and EconiQ™ Transformers as well as services, for industrial and commercial applications.

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