Description
Pressure relief valves are used to evacuate any overpressure found in the oil tanks. They operate in case the pressure increases in an accidental and uncontrolled way creating the danger of explosion of the same tank.
Their main characteristic is to operate in a very short period of time (few thousandths of a second) by evacuating the pressure increase that has taken place.
These valves are widely used in the metal tanks of oil-cooled electric transformers.
In fact a sudden and violent short-circuit generates instantaneously an enormous volume of gas which, if not readily discharged towards the exterior, could cause the explosion of the transformer itself.
The application of one or more valves and the choice of the proper diameter must be made by taking into consideration the oil volume contained in the transformer.
