Low oil trip and/or lockout apparatus
AssigneeRTE Corporation
InventorsHarvey W. Mikulecky, Todd K. Knapp
Life of this patent
Estimating the term…
Abstract
A low oil lock-out and/or trip apparatus for a submersible transformer circuit breaker of the type having a manually operated crank shaft assembly for opening and closing the circuit breaker and a fault trip assembly for opening the circuit breaker under fault current conditions, the apparatus including a float assembly which is responsive to changes in oil level in said transformer and a rod carried by said float for blocking the movement of the crankshaft and a trip member for tripping the trip assembly when the oil level drops below a predetermined level in the transformer.
Claims16
A low oil responsive lockout apparatus for an under oil primary circuit breaker of the type including an arc extinguishing assembly having an arc chamber with a fixed contact at one end of the chamber and a rod contact movable into engagement with the fixed contact within the arc chamber, a latch mechanism operably connected to move said rod contact between open and closed positions with respect to said fixed contact, a fault current trip assembly for releasing said latch mechanism from said rod contact so that said rod contact will move away from said fixed contact and a crank shaft assembly for manually moving said latch mechanism between open and closed positions, said apparatus comprising a float mounted on said arc extinguishing assembly for movement in response to changes in the level of oil in a transformer and means supported by said float for locking the crank shaft assembly in a fixed position when the oil level drops below a predetermined level with respect to the arc extinguishing assembly.
A low oil safety device for an underoil primary circuit breaker of the type having an arc extinguishing assembly, a fixed electrical contact mounted in said assembly and a rod contact mounted for movement into engagement with said fixed electrical contact in said assembly, a latch mechanism operably connected to said rod contact, a manually operable crank assembly connected to said latch mechanism for moving said rod contact between open and closed positions and a magnetically operated trip assemby operably connected to release said latch mechanism from said rod under fault current conditions, said safety device comprising a float assembly supported on said arc extinguishing assembly for movement in response to changes in the oil level in said transformer and including lock-out means for blocking movement of a crank shaft assembly when the oil level drops to a predetermined level with respect to the arc extinguishing assembly.
Dependencies are inferred from the claim text.