Modular closing resistor
AssigneeABB Power T&D Company Inc.
InventorsWillie B. Freeman, Klaus Froelich, David S. Johnson
Life of this patent
Estimating the term…
Abstract
A modular closing resistor assembly can be added in line with the interrupter assemblies of an extra high voltage circuit breaker and has a relatively short length. The resistor element consists of two stacks of disks which are disposed side by side and are electrically connected such that the alternate disks of each stack are connected in series with one another. The operating mechanism of the unit includes a linearly moving roller which engages a crank arm which is in turn pivotally connected to operate the movable closing resistor contact with a motion and with a variable mechanical advantage adapted to cause the resistor contacts to close at high speed just after the interrupter contacts close and to open after the interrupter contacts open.
Claims14
A modular closing resistor assembly for a circuit interrupter;
- said modular closing resistor assembly comprising a pair of resistor contacts relatively movable between an open and a closed position and a resistor;
- a pair of terminals at the opposite ends of said modular closing resistor assembly which are connectable in series with an interrupter assembly;
- and a first stack and a second stack, each comprising a plurality of resistor disks, said stacks together defining said resistor for said assembly;
- said first and second stacks of resistor disks being disposed laterally adjacent to one another and being substantially coextensive with one another and being disposed laterally adjacent to said pair of resistor contacts, said disks of said first and second stacks being electrically connected in series with one another in a series circuit which extends between said pair of terminals;
- said pair of resistor contacts being connected to respective ones of said pair of terminals.
A circuit interrupter comprising, in combination, at least one modular interrupter assembly elongated along an axis, at least one modular closing resistor assembly elongated along an axis, a housing elongated along an axis, and at least one pair of insulation bushings for said housing;
- said modular interrupter assembly and said modular closing resistor assembly being generally coaxial with the axis of said housing and having adjacent ends thereof connected together and the opposite ends thereof connected to respective ones of said pair of insulation bushings.
A circuit interrupter comprising, in combination, at least one modular interrupter assembly elongated along an axis, at least one modular closing resistor assembly elongated along an axis, a housing elongated along an axis, and at least one pair of insulation bushings for said housing;
- said modular interrupter assembly and said modular closing resistor assembly being generally coaxial with the axis of said housing and having adjacent ends thereof connected together and the opposite ends thereof connected to respective ones of said pair of insulation bushings, said modular closing resistor assembly comprising a pair of resistor contacts relatively movable between an open and a closed position;
- a pair of terminals at its opposite ends which are connectable in series with an interrupter assembly;
- and a first stack and a second stack, each comprising a plurality of resistor disks, said stacks together defining a closing resistor;
- said first and second stacks of resistor disks being disposed laterally adjacent to one another and being substantially coextensive with one another and being disposed laterally adjacent to said pair of resistor contacts, said disks of said first and second stacks being electrically connected in series with one another in a series circuit which extends between said pair of terminals;
- said pair of resistor contacts being connected to respective ones of said pair of terminals.
A circuit interrupter comprising, in combination, at least one modular interrupter assembly elongated along an axis, at least one modular closing resistor assembly elongated along an axis, a housing elongated along an axis, and at least one pair of insulation bushings for said housing;
- said modular interrupter assembly and said modular closing resistor assembly being generally coaxial with the axis of said housing and having adjacent ends thereof connected together and the opposite ends thereof connected to respective ones of said pair of insulation bushings;
- said modular closing resistor assembly including stationary contact, a relatively movable contact biased to an open position relative to said stationary contact and axially movable into and out of engagement with said stationary contact;
- and an operating linkage fixed to said movable contact and comprising a crank arm having a fixed central pivot and rotatable around said fixed central pivot;
- and an axially movable roller driver fixed to the movable contact of said interrupter;
- said roller contact engaging a side surface of said crank link which faces away from said fixed central pivot so as to rotate said crank link with a variable mechanical advantage as said interrupter contact is moved between an engaged and disengaged position, whereby said resistor contacts have a closing travel characteristic in which they close after said interrupter contacts close and open before said interrupter contacts open.
Dependencies are inferred from the claim text.