Importance

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Abstract

A pressure relief device for a power transformer provided with a tank filled with an insulating liquid, the pressure relief device including: a support flange operatively coupleable with the tank and including a through port coupleable with an opening of the tank; a valve element displaceable between a closed position, at which it obstructs the through port, and an open position, at which it is spaced away from the support flange; a protection cover fixed with the support flange and spaced apart from the support flange and the valve element; first elastic means adapted to urge the valve element in the closed position and contrast a movement of the valve element from the closed position to the open position; and at least a switch device adapted to signal a movement of the valve element from the closed position to the open position. The switch device includes a switch pin reversibly movable between a compressed position and a released position. A movement of the switch pin from the compressed position to the released position is responsive to a movement of the valve element from the closed position to the open position.

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First Claim