Transformer internal fault warning indicator
First Claim
1. An internal arcing warning indicator for a transformer comprising:
- an opening in a casing of the transformer;
moveable piston means for sensing pressure surges due to internal arcing faults within the transformer, said piston means being mounted over the opening in the transformer casing and within means received in the opening to retain the piston means over the opening, the piston means having at least one aperture therein to allow slow increases and decreases of pressure within the transformer without the piston means moving a predetermined distance; and
indicator means attached to the piston means and to the retaining means, for providing an indication that the piston means has moved a predetermined distance and for retaining the indication until reset.
3 Assignments
0 Petitions
Accused Products
Abstract
A warning indicator provides an indication that a transient over-pressure condition has occurred in a transformer. The indicator takes into account small or slow pressure changes and only indicates pressure surges. The internal arcing warning indicator comprises an opening in a casing of a transformer, a movable piston over the opening with a retainer to retain the piston over the opening, the piston having at least one small aperture therein to allow slow increases and decreases of pressure within the transformer without the piston moving, and an indicator attached to the piston, the indicator providing an indication that the piston has moved a predetermined distance and retaining the indication until reset.
30 Citations
5 Claims
-
1. An internal arcing warning indicator for a transformer comprising:
-
an opening in a casing of the transformer; moveable piston means for sensing pressure surges due to internal arcing faults within the transformer, said piston means being mounted over the opening in the transformer casing and within means received in the opening to retain the piston means over the opening, the piston means having at least one aperture therein to allow slow increases and decreases of pressure within the transformer without the piston means moving a predetermined distance; and indicator means attached to the piston means and to the retaining means, for providing an indication that the piston means has moved a predetermined distance and for retaining the indication until reset. - View Dependent Claims (2, 3, 4, 5)
-
Specification