Overcurrent trip circuit

Details Overcurrent trip circuit Overcurrent trip circuit

H - Electricity

02

H

H02H 3/08 (2006.01) H02H 3/28 (2006.01) H02H 3/38 (2006.01) H02H 3/44 (2006.01)

Patent

CA 2049120

56,150 ABSTRACT OF THE DISCLOSURE An overcurrent trip circuit monitors the rate of rise of the current and the magnitude of the current in a power conductor and opens a circuit containing the power conductor when either the rate of rise of the current exceeds a first preselected limit value or the magnitude of the current exceeds a second preselected limit value. The inherent inductance in a metering shunt is used to produce a voltage signal that contains a component which is representative of the rate of change of current in a power conductor. This voltage signal is compared to a first reference signal to produce a trip signal when the voltage exceeds the first reference signal. In addition, the voltage signal is processed and the processed voltage signal is compared to a second reference signal to produce a second trip signal when the magnitude of the processed voltage signal exceeds the magnitude of the second refer- ence signal. The power circuit is then opened in response to either of the first or second trip signals.

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