WIDE RANGE CURRENT MONITORING SYSTEM AND METHOD FOR ELECTRONIC TRIP UNITS

摘要

A circuit interrupter that includes a passive integration channel structured to receive an output signal from a di/dt current sensor and generate a first signal output based on the output signal, and an active integration channel structured to receive the output signal from the di/dt current sensor and generate a second signal output based on the output signal that is proportional to the primary current received by the di/dt current sensor. Circuit protection functionality is provided based on the first signal output responsive to the primary current being determined to be greater than a threshold level, current metering and circuit protection functionality is provided based on the second signal output responsive to the primary current being determined to be less than or equal to the threshold level, and a seed current value is provided to the active integrator based on the first signal output.

主权项

1. A circuit interrupter, comprising:
a passive integration channel including a passive integration circuit, wherein the passive integration channel is structured to receive an output signal from a di/dt current sensor and generate a first signal output based on the output signal that is proportional to a primary current received by the di/dt current sensor; an active integration channel including an active integrator, wherein the active integration channel is structured to receive the output signal from the di/dt current sensor and generate a second signal output based on the output signal that is proportional to the primary current received by the di/dt current sensor; a control system, wherein the control system stores and is structured to execute a number of routines, the number of routines being structured to:
provide circuit protection functionality for the circuit interrupter based on the first signal responsive to the primary current being determined to be greater than a threshold level;provide current metering and circuit protection functionality for the circuit interrupter based on the second signal output responsive to the primary current being determined to be less than or equal to the threshold level; andprovide a seed current value to the active integrator based on the first signal output.