Data acquisition system for a circuit breaker
First Claim
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1. An electrical system, comprising:
- a load running on an alternating current;
a circuit breaker coupled to the load; and
a data acquisition system for a circuit breaker, the data acquisition system having a discrete energy transducer providing a source signal related to the current in the circuit breaker;
a microprocessor;
a signal conditioning circuit coupled to the microprocessor and configured to receive a periodic signal from the microprocessor; and
a chopping circuit coupled to the signal conditioning circuit and coupled to the signal source, the chopping circuit configured to chop the source signal in response to the periodic signal, the chopping circuit including;
a measurement branch coupled to the signal source; and
a switching branch coupled to the signal conditioning circuit and coupled to the signal source, wherein the switching branch is switched in response to the periodic signal and measurement, across the measurement branch, is carried out in response to the periodic signal.
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Abstract
A circuit breaker system 10 (FIG. 1) using electronic trip units 35 is disclosed. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled, and/or monitored by a central computer. Further, the electronic trip units 30 include a data acquisition circuit 100 (FIG. 4) that uses chopping to provide better accuracy and increased dynamic range of current measurements.
22 Citations
5 Claims
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1. An electrical system, comprising:
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a load running on an alternating current;
a circuit breaker coupled to the load; and
a data acquisition system for a circuit breaker, the data acquisition system having a discrete energy transducer providing a source signal related to the current in the circuit breaker;
a microprocessor;
a signal conditioning circuit coupled to the microprocessor and configured to receive a periodic signal from the microprocessor; and
a chopping circuit coupled to the signal conditioning circuit and coupled to the signal source, the chopping circuit configured to chop the source signal in response to the periodic signal, the chopping circuit including;
a measurement branch coupled to the signal source; and
a switching branch coupled to the signal conditioning circuit and coupled to the signal source, wherein the switching branch is switched in response to the periodic signal and measurement, across the measurement branch, is carried out in response to the periodic signal. - View Dependent Claims (2, 3, 4, 5)
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Specification
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Current AssigneeSiemens Industry Incorporated (Siemens AG)
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Original AssigneeSiemens Energy & Automation Incorporated (Siemens AG)
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InventorsBilac, Mario, Staley, Peter Spenlove
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Primary Examiner(s)HUYNH, KIM NGOC
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Application NumberUS10/184,221Publication NumberTime in Patent Office530 DaysField of Search361/18, 361/20-21, 361/93.1, 361/93.2, 361/78, 361/100, 323/284, 340/3.1, 340/825.22US Class Current361/93.2CPC Class CodesH02H 1/0092 concerning the data process...H02H 3/006 Calibration or setting of p...
