Circuit interrupter with energy management functions
First Claim
1. Self-contained circuit interrupter apparatus, comprising:
- interrupter means for conducting current flow in an associated circuit and for operating to interrupt the current flow therethrough on command;
sensing means for sensing current flow through said interrupter means and for supplying operating power to said apparatus;
trip unit means connected to said interrupter means and said sensing means for operating said interrupter means when current flow therethrough exceeds predetermined limits;
voltage means for obtaining the value of line voltage on the associated circuit;
power factor means for obtaining the value of power factor on the associated circuit;
arithmetic means connected to said current sensing means, said voltage means, and said power factor means for calculating real power flow through the associated circuit;
a housing enclosing said apparatus; and
display means visible from the exterior of said housing and connected to said arithmetic means for displaying the numeric value of said product as real power being delivered by the associated circuit.
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Abstract
A circuit interrupter includes a digital trip unit containing a microprocessor. The circuit interrupter also includes current transformers for sensing current flow through the contacts of the interrupter and for providing operating power to the trip unit. The current transformers monitoring current flow through the breaker and control potentiometers receiving operator-entered values of the product of line voltage and power factor are connected to the microprocessor to supply it with the values needed to compute real power flow through the interrupter and to display the numeric value of this power flow. The power flow is compared to an operator-entered limit value of peak demand power, and an alarm signal is generated whenever power flow exceeds the limit value peak demand. Integration capability is also provided to calculate energy flow through the contacts in megawatt hours and to present the numeric value of this energy flow.
69 Citations
10 Claims
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1. Self-contained circuit interrupter apparatus, comprising:
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interrupter means for conducting current flow in an associated circuit and for operating to interrupt the current flow therethrough on command; sensing means for sensing current flow through said interrupter means and for supplying operating power to said apparatus; trip unit means connected to said interrupter means and said sensing means for operating said interrupter means when current flow therethrough exceeds predetermined limits; voltage means for obtaining the value of line voltage on the associated circuit; power factor means for obtaining the value of power factor on the associated circuit; arithmetic means connected to said current sensing means, said voltage means, and said power factor means for calculating real power flow through the associated circuit; a housing enclosing said apparatus; and display means visible from the exterior of said housing and connected to said arithmetic means for displaying the numeric value of said product as real power being delivered by the associated circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification