Abstract: A circuit breaker electronic trip unit includes a controller, and a memory that stores a threshold tripping duration. The memory is readable by the controller. The trip unit includes a trip signal output, and an input section that receives at least one of a phase current level signal, a phase or line voltage level signal, and a contact state change signal. The trip unit activates the trip signal output and monitors the input section for a predetermined signal change. The trip unit determines a tripping duration from a timing of the activation of the trip signal output and a timing of the predetermined signal change. The trip unit compares the tripping duration to the threshold tripping duration to determine a sluggish circuit breaker operation.
Abstract: A circuit protection system includes a normal mode and a maintenance mode. A current sensor senses current in the circuit. An enclosure includes an access panel that is movable between a closed position and open position. A circuit breaker is mounted within the enclosure. An electronic trip unit is in communication with the current sensor and controls interruptions of the current by the circuit breaker based on a trip setting. An interface device is accessible when said access panel is closed and allows selections of the normal and maintenance modes. A display, which is in communication with both of the user interface device and the electronic trip unit, monitors the interface device and transmits data to the trip unit that is based on the selected mode. The display receives data from the trip unit and displays information based on the received data. The display is viewable when the access panel is closed.
Type:
Grant
Filed:
November 9, 2009
Date of Patent:
February 15, 2011
Assignee:
Utility Relay Co., Ltd.
Inventors:
Helmut Weiher, Richard C. Fleischer, Jeffrey W. Patterson
Abstract: A circuit protection system includes a normal mode and a maintenance mode. A current sensor senses current in the circuit. An enclosure includes an access panel that is movable between a closed position and open position. A circuit breaker is mounted within the enclosure. An electronic trip unit is in communication with the current sensor and controls interruptions of the current by the circuit breaker based on a trip setting. An interface device is accessible when said access panel is closed and allows selections of the normal and maintenance modes. A display, which is in communication with both of the user interface device and the electronic trip unit, monitors the interface device and transmits data to the trip unit that is based on the selected mode. The display receives data from the trip unit and displays information based on the received data. The display is viewable when the access panel is closed.
Type:
Application
Filed:
November 9, 2009
Publication date:
March 4, 2010
Applicant:
UTILITY RELAY CO., LTD.
Inventors:
Helmut Weiher, Richard C. Fleischer, Jeffrey W. Patterson
Abstract: A circuit protection system includes a normal mode and a maintenance mode. A current sensor senses current in the circuit. An enclosure includes an access panel that is movable between a closed position and open position. A circuit breaker is mounted within the enclosure. An electronic trip unit is in communication with the current sensor and controls interruptions of the current by the circuit breaker based on a trip setting. An interface device is accessible when said access panel is closed and allows selections of the normal and maintenance modes. A display, which is in communication with both of the user interface device and the electronic trip unit, monitors the interface device and transmits data to the trip unit that is based on the selected mode. The display receives data from the trip unit and displays information based on the received data. The display is viewable when the access panel is closed.
Type:
Grant
Filed:
March 7, 2007
Date of Patent:
January 12, 2010
Assignee:
Utility Relay Co., Ltd.
Inventors:
Helmut Weiher, Richard C. Fleischer, Jeffrey W. Patterson
Abstract: A circuit protection system includes a normal mode and a maintenance mode. A current sensor senses current in the circuit. An enclosure includes an access panel that is movable between a closed position and open position. A circuit breaker is mounted within the enclosure. An electronic trip unit is in communication with the current sensor and controls interruptions of the current by the circuit breaker based on a trip setting. An interface device is accessible when said access panel is closed and allows selections of the normal and maintenance modes. A display, which is in communication with both of the user interface device and the electronic trip unit, monitors the interface device and transmits data to the trip unit that is based on the selected mode. The display receives data from the trip unit and displays information based on the received data. The display is viewable when the access panel is closed.
Type:
Application
Filed:
March 7, 2007
Publication date:
September 13, 2007
Applicant:
UTILITY RELAY CO., LTD.
Inventors:
HELMUT WEIHER, RICHARD C. FLEISCHER, JEFFREY W. PATTERSON