Eaton Corporation

Joe M Kellis

Lawrence B Farr

Robert Yanniello

Justin Raymond Hoglund

A protection relay for an electrical switching apparatus for a load includes a number of voltage sensors structured to sense voltage applied to the load, a number of current sensors structured to sense current flowing to the load, and a processor cooperating with the number of voltage sensors and the number of current sensors. The processor determines a fault current available at the load. An output cooperates with the processor. The output is structured to output the determined fault current and a number of: incident energy at the electrical switching apparatus, and a personal protective equipment level operatively associated with the electrical switching apparatus. The processor determines from the determined fault current the number of: the incident energy at the electrical switching apparatus, and the personal protective equipment level operatively associated with the electrical switching apparatus.

Protection relay, electrical switching apparatus, and system for determining and outputting fault current available at a load and incident energy or personal protective equipment level operatively associated therewith

An electrical switching apparatus includes a number of separable contacts, an operating mechanism structured to open and close the separable contacts, a number of sensors structured to sense at least current flowing through the separable contacts, and a processor structured to cooperate with the operating mechanism to open and close the separable contacts. The processor determines a fault from the sensed current flowing through the separable contacts. The processor further responsively opens the separable contacts if the sensed current associated with the fault is less than the interrupting rating of the electrical switching apparatus. The processor keeps the separable contacts closed and waits for another circuit interrupter to interrupt the fault if the sensed current associated with the fault is greater than the interrupting rating.

Electrical switching apparatus providing coordinated opening with a circuit interrupter and method of operating the same

The movable conductors of a three-phase isolation switch are incorporated into the electrically insulative molded shaft, thereby mechanically supporting them and isolating them from the metal axle of the shaft. Movable contacts on the ends of each movable conductor are angularly spaced by &agr; degrees, where &agr; is less than 180&deg; and is 90&deg; in the exemplary embodiment. A common fixed load contact is located angularly between, and spaced &agr; degrees from, both the fixed line and ground contacts so that the shaft is rotated only &agr; degrees between a first, closed position, in which the movable conductors connect the fixed load contact for each phase to the corresponding fixed line contact, and a second, grounded position, where the fixed load contact of each phase is connected by the movable conductor to the corresponding fixed ground contact.

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Weaverville, NC, United States of America

Joe M Kellis