Pressure Relief Device

PRESSURE RELIEF DEVICES FOR POWER TRANSFORMERS (with electric come tos) general FEATURES When it is demand to limit the force rise inside a tank, in order to prevent an overindulgenceive mechanical stress of the walls, it is indispensable to drug abuse a safety valve set at a meticulous over twitch value. The tank of oil-immersed transformers is usually fit with this diversity of defend device; as matter of fact, in grimace of shortcircuit due(p) to an insulation failure, the dielectric arc between alive check vaporises the surrounding insulating fluid which generates a quick rise of the pressure inside the tank, with the risk of permanent deformations, or, even, of the failure of the tank walls with the serial flow-out of hot oil. Due to the rapidity of this event, it is necessary to mount on the transformer an adequate protecting device which relieves quite suddenly the extravagance of pressure generated inside the tank by the above mentioned failure. Our press ure level Relief Devices VP have this protective function.

WAY OF WORKING The advocate of working of above device is very simple: one at a eon time the pressure inside the transformer tank reach the at once pressure of the PRD, the shutter lift slowly from its rest short letter disjoining from the main tightening gasket (pos 9 of the attached sketch); in this final payment aim the exorbitance of pressure cant be released in the environment, being the shutter still in contact with the immaterial gasket (pos 10 of the attached sketch). Now the internal overpressure operates on the square internal go up of the shutter, which is bigger than the in! itial surface: consequently, the loudness acting on the shutter is much spirited than the spring-load on the other side; this brings to a quick and high lifting of the shutter followed by an equally fast reclosure as the excess of pressure is released in a very short time through the big opening created by the shutter lifting. GENERAL FEATURES of our VP devices Body, connecting recess and shutter in cast aluminium, paint...If you want to bulge a full essay, order it on our website: OrderCustomPaper.com

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