Electrical power monitoring system

• US 5,196,982 A
• Filed: 08/23/1991
• Issued: 03/23/1993
• Est. Priority Date: 08/23/1991
• Status: Expired due to Term

• Current Assignee: Science Applications International Corporation
• Original Assignee: The Fleming Group
• Inventors: Landsberg, Dennis, Hesse, Bradley J.
• Primary Examiner(s): Pellinen, A. D.
• Assistant Examiner(s): JACKSON, STEPHEN W
• Application Number:
  US07/749,374
• Time in Patent Office: 578 Days
• Field of Search: 361/93, 361/82, 361/68, 361/78, 364/483, 364/480, 364/492, 324/103
• US Class Current: 361/93.1
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: G01R 21/133 by using digital technique
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00017 using optical fiber
• CPC Class Codes: H02J 13/00036 the elements or equipment being or involving switches, relays or circuit breakers circuits for indication of single switches H01H9/167
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge

Abstract

A method and system incorporating an integral power consumption monitor-circuit breaker panel for industrial or commercial buildings and facilities. The power consumption monitor-circuit breaker panel not only protects each end use within the building against harmful overloads, but also monitors peak power demands of each end use. Electrical current, voltage and phase information is provided by each monitor-breaker. This information is then fed to a processing circuit that provides a power consumption value. The power consumption value is then fed to recording device to provide a power consumption history for each end use. Each monitor-breaker is identified by its end use, as for example, by color coding. The monitor device of each circuit breaker is designed to provide a voltage that is proportional to the circuit load. Two methods may be used to provide such a voltage signal: a) the voltage signal can be developed across a built-in shunt in each circuit braeker; and b) a proportional voltage can be obtained by use of a circuit breaker with a built-in Hall effect device, wherin the product of the instantaneous current and voltage along with the phase angle between them, provides the power measurement. The current and/or instantaneous power information can be sent to the recording device via a powerline carrier, radio link, or optical fiber. The information can be integrated to provide either kW or kW/hr readings.

Claims

1. An end use power consumption monitor for industrial or commercial buildings integrally constructed with a circuit breaker, said power consumption monitor disposed in a current carrying line feeding an end use circuit of said industrial or commercial building, said power consumption monitor providing a voltage signal proportional to current being carried by said circuit breaker for said end use circuit, said power consumption monitor operatively connected to a processing circuit for receiving said voltage signal and for processing said voltage signal to provide a power consumption value for said end use circuit, said end use power consumption monitor further including a circuit breaker panel for housing said power consumption monitor integrally constructed with said circuit breaker, and wherein a plurality of power consumption monitors and integral circuit breakers are housed by said circuit breaker panel, each of said plurality of power consumption monitors and integral circuit breakers being operative for a separate end use, and further wherein each end use is coded to identify said end use on said circuit breaker panel.

2. The end use power consumption monitor of claim 1, wherein said power consumption monitor further comprises a shunt disposed in said current carrying line.

3. The end use power consumption monitor of claim 1, wherein said power consumption monitor further comprises a Hall effect sensor disposed in said current carrying line.

4. The end use power consumption monitor of claim 1, wherein said processing circuit comprises a sample and hold circuit for receiving said voltage signal, an A/D converter connected to said sample and hold circuit for converting said voltage signal to a digital value, and a microprocessor connected to said A/D converter for processing said digital value to provide a power consumption value.

5. The end use power consumption monitor of claim 4, wherein said power consumption value is integrated by said microprocessor to provide a power consumption rate value.

6. A method of determining a power consumption value for an end use circuit of a commercial or industrial building, comprising the steps of:

a) feeding a line current through a circuit breaker to an end use circuit disposed in a commercial or industrial building, said circuit breaker being added to reflect a particular end use to which the circuit breaker is servicing;

b) monitoring said line current within said circuit breaker, and obtaining a voltage signal proportional to said line current being fed to said end use circuit; and

c) processing said voltage signal to provide a power consumption value for said end use circuit.

7. The method of claim 6, wherein said processing step (c) further comprises the step of integrating said voltage signal to provide a power consumption rate value.

8. The method of claim 6, wherein said steps (a) through (c) are performed for each of a plurality of end use circuits.

9. The method of claim 6, further comprising the steps of:

d) recording said power consumption value.

10. The method of claim 8, further comprising the steps of:

d) recording each of said power consumption values.

11. The method of claim 6, further comprising the steps of:

d) breaking the line current to said end use circuit when said line current exceeds a circuit breaker limit.

12. The method of claim 8, further comprising the steps of:

d) breaking the line current to any of said end use circuits when its line current exceeds its circuit breaker limit.

13. An end use power consumption monitor system for industrial or commercial buildings integrally constructed with a circuit breaker panel, said power consumption monitor system comprising:

a plurality of circuit breakers each servicing an end use circuit in an industrial or commercial building, and each being coded to reflect said particular end use to which each circuit breaker is servicing;

a circuit breaker panel for housing said plurality of circuit breakers; and

power consumption monitoring means disposed within each of said plurality of circuit breakers housed in said circuit breaker panel for monitoring power consumption of a respective end use circuit of said industrial or commercial building.

14. The end use power consumption monitor system for industrial or commercial buildings in accordance with claim 13, wherein said power consumption monitoring means further comprises means for providing a power consumption value for each end use circuit.

15. The end use power consumption monitor system for industrial or commercial buildings in accordance with claim 14, wherein said power consumption monitoring means further comprises means for recording said power consumption value for each end use circuit.

16. An end use power consumption monitor system for industrial or commercial buildings in accordance with claim 14, wherein said power consumption monitoring means is connected to a recording means by an optical fiber, said recording means recording a power consumption value for each end use circuit.