Patent ID: 7777994

Claim:
A device for preventing the explosion of an element of an electrical transformer provided with a tank containing a combustible transformer cooling fluid, comprising a pressure release element, coupled to an outlet of the tank for decompressing the tank and a gastight inflatable bag coupled to an outlet orifice by a flange, said gastight inflatable bag being coupled to the outlet orifice with a sealed gastight connection downstream of the pressure release element and configured to pass from a substantially un-inflated state to a gas inflated state upon the rupture of the pressure release element and for confining combustible transformer cooling fluid passing through the pressure release element such that the combustible transformer cooling fluid does not leak from the gastight inflatable bag, wherein the pressure release element is configured to rupture such that substantially unrestricted release of gas occurs from the tank to the gastight inflatable bag when a predetermined pressure occurs in the tank.