If the pressure cannot be externally discharged there is a danger that the transformer could explode and potentially cause harm and damage.
Pressure relief device in transformer.
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.
The prd allows rapid release of excessive pressure that may be generated in the event of a serious fault.
An internal fault in an oil filled transformer is usually accompanied by overpressure in the transformer tank.
The surge of oil caused by a heavy internal fault bursts the disk and allows the oil to discharge rapidly.
The simplest form of pressure relief device is the widely used frangible disk.
Qualitrol 201 202 205 small pressure relief device.
It is fitted on the top of the main tank.
The pressure relief device limits the tank overpressure and reduces the risk of tank rupture and uncontrolled oil spill which might also cause a fire.
This device is fitted with an alarm trip switch.
Pressure relief device for power transformers.