Integrated power line metering and communication method and apparatus

• US 6,177,884 B1
• Filed: 11/12/1998
• Issued: 01/23/2001
• Est. Priority Date: 11/12/1998
• Status: Expired due to Fees

• Current Assignee: Hunt Techonologies Incorporated (Landis+Gyr Group AG)
• Original Assignee: Hunt Techonologies Incorporated (Landis+Gyr Group AG)
• Inventors: Hunt, Paul C., Burnham, Steven Mose
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): Edwards, Jr., Timothy
• Application Number:
  US09/191,287
• Time in Patent Office: 803 Days
• Field of Search: 340/870.02, 340/870.17, 340/870.28, 340/310.01, 340/310.07, 340/870.03, 340/870.07, 324/126, 324/127, 324/142
• US Class Current: 340/870.02
• CPC Class Codes: G01R 11/16 Adaptations of counters to electricity meters

Abstract

A quick connect power line metering and communication apparatus and method for measuring energy consumption or other electrical characteristics on a power line and for communicating the measured information to a remote location. The apparatus includes a housing, and a coupling mechanism attached to the housing to physically connect the housing to a suspended portion of the power line, and to provide an electrical connection to at least one conductor of the power line. A metering apparatus is provided within the housing, and is electrically coupled to the power line conductors via the coupling mechanism to measure energy consumption. The metering apparatus includes a current monitor and a voltage monitor to measure the energy consumption on the power line. A communications apparatus is provided within the housing, and is electrically coupled to the metering apparatus. The communications apparatus communicates information corresponding to the measured energy consumption to a remote location.

Claims

1. A power line metering and communication apparatus for measuring electrical information on a power line, comprising:

a housing;

a coupling mechanism attached to the housing to physically connect the housing to a suspended power line under strain, and to provide an electrical connection to one or more conductors of the suspended power line, the coupling member including a clamp portion and a cutting device to sever a current-carrying one of the power line conductors;

metering apparatus disposed within the housing and electrically coupled to the power line conductors via the coupling mechanism, wherein the metering apparatus comprises at least a current monitor and a voltage monitor to measure the power line current and power line voltage; and

a communications apparatus disposed within the housing and coupled to the metering apparatus to communicate information derived from the power line current and voltage measurements to a remote location.

2. The power line metering and communication apparatus as in claim 1, wherein one of the first and second clamp portions includes a pocket, and the other of the first and second clamp portions includes a projection that is receivable within the pocket to guide a current-carrying one of the power line conductors into the pocket.

3. The power line metering ad communication apparatus as in claim 1, further comprising a magnetic current sensor positioned proximate the current-carrying conductors to sense the power line current therethrough, and wherein the current monitor measures the power signal current sensed by the magnetic current sensor.

4. The power line metering and communication apparatus as in claim 1, wherein each of the first and second clamp portions is provided with recesses adapted to receive the power line conductors, wherein the recesses on the first and second clamp portions are physically aligned to envelop the corresponding power line conductors.

5. The power line metering and communication apparatus as in claim 1, wherein the housing is substantially filled with a non-conductive material.

6. The power line metering and communication apparatus as in claim 1, wherein the metering apparatus comprises an integrated circuit to receive a current value and a voltage value from the current monitor and voltage monitor respectively, and to output an energy consumption indication in response thereto.

7. The power line metering and communication apparatus as in claim 1, wherein the communications apparatus is connected to the power line for communicating the measured information via the power line.

8. The power line metering and communication apparatus as in claim 1, wherein the communications apparatus includes a wireless transmitter to communicate the measured information to the remote location.

9. The power line metering and communication apparatus as in claim 1, wherein the communications apparatus includes a digital interface to communicate the measured information via a dedicated digital interface using a digital transmission protocol.

10. The power line metering and communication apparatus as in claim 1, further comprising a shunt resistance coupled in series with a current-carrying conductor of the power line, wherein the current monitor measures a power signal current on the power line by measuring the current through the shunt resistance.

11. The power line metering and communication apparatus as in claim 1, wherein:

the housing comprises an enclosure to enclose the metering apparatus and the communications apparatus, wherein the enclosure is substantially filled with a non-conductive material; and

the coupling mechanism is connected to the enclosure to provide a unitary package for the metering and communications apparatus.

12. The power line metering and communication apparatus as in claim 1, wherein one of the first and second clamp portions includes conductive elements thereon, the conductive elements adapted to electrically engage current-carrying conductors of the power line.

13. The power line metering and communication apparatus as in claim 12, wherein each of the conductive elements comprises one or more conductive barbs capable of piercing a dielectric sheath on the current-carrying conductors to electrically connect the conductive elements to the current-carrying conductors.

14. The power line metering and communication apparatus as in claim 1, wherein one of the first and second clamp portions includes a cutting device to sever a current-carrying one of the power line conductors.

15. The power line metering and communication apparatus as in claim 14, wherein:

the cutting device comprises a dielectric barrier to electrically isolate severed portions of the current-carrying conductors; and

the first and second clamp portions includes at least two conductive elements thereon, each of the conductive elements adapted to electrically engage one of the severed portions of the current-carrying conductors.

16. The power line metering and communication apparatus as in claim 15, further comprising a shunt resistance coupled in series with the severed portions of the current-carrying conductors via associated ones of the conductive elements, and wherein the current monitor measures the power line current by measuring the current through the shunt resistance.

17. The power line metering and communication apparatus as in claim 1, wherein the communications apparatus is electrically coupled to the power line conductors via the coupling mechanism to communicate the measured information via a carrier signal on the power line.

18. The power line metering and communication apparatus as in claim 17, wherein the communications apparatus comprises an ultra narrow bandwidth transmitter to communicate the measured information using the power signal on the power line as a subcarrier signal.

19. The power line metering and communication apparatus as in claim 17, wherein the measured information is communicated using a lower frequency than a frequency of a power signal transmitted on the power line.

20. A power line metering and communication apparatus for measuring electrical information on a power line, comprising:

a housing;

a coupling mechanism attached to the housing to physically connect the housing to a suspended power line under strain, and to provide an electrical connection to one or more conductors of the suspended power line;

metering apparatus disposed within the housing and electrically coupled to the power line conductors via the coupling mechanism, wherein the metering apparatus comprises at least a current monitor and a voltage monitor to measure the power line current and power line voltage, the voltage monitor comprising a voltage sensor coupled to a current-carrying conductor of the power line and coupled to a reference voltage to measure a power signal voltage on the power line; and

a communications apparatus disposed within the housing and coupled to the metering apparatus to communicate information derived from the power line current and voltage measurements to a remote location.

21. A power line metering and communication apparatus for measuring electrical information on a power line, comprising:

a housing;

a coupling mechanism attached to the housing to physically connect the housing to a suspended power line under strain, and to provide an electrical connection to one or more conductors of the suspended power line, wherein the coupling mechanism comprises a wire support structure to physically support the connected portion of the suspended power line within the housing without requiring release of the strain in the suspended power line, and wherein strain relief for the connected portion of the suspended power line is provided via the wire support structures;

metering apparatus disposed within the housing and electrically coupled to the power line conductors via the coupling mechanism, wherein the metering apparatus comprises at least a current monitor and a voltage monitor to measure the power line current and power line voltage; and

a communications apparatus disposed within the housing and coupled to the metering apparatus to communicate information derived from the power line current and voltage measurements to a remote location.

22. A power line metering and communication apparatus for recognizing and communicating electrical current-related information, comprising:

a housing;

a coupling mechanism attached to the housing to physically connect the housing to the power line and to provide an electrical connection to one or more conductors of the power line, wherein the coupling mechanism comprises a strain relief mechanism to facilitate the connection of the housing to a suspended portion of the power line without a need for external strain relief;

current monitoring apparatus disposed within the housing and electrically coupled to the power line conductors via the coupling mechanism to measure current-related signals, wherein the current monitoring apparatus comprises a current monitor to measure the current signal traversing the power line; and

a communications apparatus disposed within the housing and electrically coupled to the current monitoring apparatus to communicate information derived from the measured current-related signals to a remote location.

23. The power line metering and communication apparatus as in claim 22, wherein the current-related information is selected from the group comprising a maximum current value, a minimum current value, and an average current value over a predetermined time period.

24. A power line metering and communication apparatus for recognizing and communicating electrical voltage-related information, comprising:

a housing;

a coupling mechanism attached to the housing to physically connect the housing to the power line and to provide an electrical connection to one or more conductors of the power line, wherein the coupling mechanism comprises a strain relief mechanism to facilitate the connection of the housing to a suspended portion of the power line without a need for external strain relief;

voltage monitoring apparatus disposed within the housing and electrically coupled to the power line conductors via the coupling mechanism to measure voltage-related signals, wherein the voltage monitoring apparatus comprises a voltage monitor to measure the voltage signal on the power line; and

a communications apparatus disposed within the housing and coupled to the voltage monitoring apparatus to communicate information derived from the measured voltage-related signals to a remote location.

25. The power line metering and communication apparatus as in claim 24, wherein the voltage-related information is selected from the group comprising a peak voltage value, a minimum voltage value, and an average voltage value.

26. A method of metering energy consumption on a power line, comprising:

attaching a housing to a suspended portion of the power line, wherein the housing contains at least a metering apparatus for measuring energy consumption and a communications apparatus;

providing strain relief for the portion of the suspended power line attached to the housing, wherein the strain relief is provided from within the housing, thereby requiring no external strain relief,

electrically coupling the metering apparatus to the power line;

metering the watt-hours of energy consumed via the power line;

transmitting a signal corresponding to the watt-hours of energy consumed to a remote location via the communications apparatus.

27. The method of claim 26, wherein transmitting a signal comprises transmitting the signal by modulating the signal onto a power signal carried on the power line.

28. The method of claim 26, wherein transmitting the signal comprises transmitting the signal using a power signal as a subcarrier signal such that the signal is transmitted using a lower frequency than a frequency of the power signal.

29. The method of claim 26, wherein electrically coupling the metering apparatus to the power line comprises:

clamping the housing to the power line;

electrically contacting selected power line conductors of the power line; and

coupling the selected power line conductors to the metering apparatus.

30. The method of claim 29, wherein electrically contacting selected power line conductors comprises severing a selected one of the power line conductors and coupling the metering apparatus in series with the severed power line conductor.

31. A system for metering and communicating power consumption information;

comprising;

a power source to provide a power signal;

power distribution lines coupled to distribute the power signal from the power source to one or more power consumers; and

an integrated power metering and communication apparatus for each of a selected group of the one or more power consumers to measure the power consumed by each of the selected group of power consumers, the integrated power metering and communication apparatus comprising;

a housing;

a coupling mechanism attached to the housing to physically connect the housing to a suspended portion of the power distribution line leading to a corresponding one of the power consumers, and to provide an electrical connection to one or more conductors of the power distribution line, wherein the coupling mechanism comprises a wire support structure to physically support the suspended portion of the power distribution line within the housing without requiring release of the strain in the suspended power distribution line, and wherein any required strain relief for the suspended portion of the power distribution line is provided entirely via the wire support structure, thereby eliminating the need for external strain relief;

a metering apparatus disposed within the housing and electrically coupled to the power line conductors via the coupling mechanism, wherein the metering apparatus comprises at least a current monitor and a voltage monitor to measure the power line current and power line voltage on the power line conductors; and

a communications apparatus disposed within the housing and coupled to the metering apparatus to communicate information derived from the power line current and voltage measurements to a remote location.