H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/26
H02H 3/093 (2006.01) H02H 1/04 (2006.01)
Patent
CA 1315383
ABSTRACT An arrangement is provided for checking the validity of a sensed-current signal from a current-sensing device. The sensed-current signal represents the current in a line. An associated control circuit utilizes the sensed-current signal to indicate or predict the presence of undesired overcurrent conditions. When such conditions may be present, the sensed-current signal is checked to determine if the sensed-current signal is valid; i.e., whether the sensed-current signal accurately represents the current in the line. If the sensed-current signal is invalid, no trip signal is generated to interrupt the current. If the sensed-current signal is valid, the control circuit generates a trip signal to control operation of a circuit-interrupting device. In a particular arrangement, the load on the current-sensing device is changed to determine if the sensed-current signal is valid. If the sensed- current signal is valid, the level of the sensed-current signal remains in a valid range and the overcurrent-detection circuit issues the trip signal. If the sensed-current signal is invalid, the level of the sensed-current signal changes. In response, the control circuit does not issue the trip signal and is reset to an initialized mode to monitor for a valid overcurrent condition in response to the sensed-current signal. In a specific arrangement, the current-sensing device is an iron-core transformer which saturates at high current levels.
586435
Osler Hoskin & Harcourt Llp
S. & C. Electric Company
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