Electric charge storage apparatus and method for an intelligent electronic device

• US 6,687,627 B1
• Filed: 06/29/2001
• Issued: 02/03/2004
• Est. Priority Date: 08/09/1999
• Status: Expired due to Term

• Current Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Original Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Inventors: Loewen, Dan N., Hancock, Martin A., Lightbody, Simon H., Gunn, Colin N., Etheridge, Hal E.
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): Raymond, Edward
• Application Number:
  US09/897,877
• Time in Patent Office: 949 Days
• Field of Search: 702/61, 702/62, 702/63, 702/64, 702/65, 702/99, 702/130, 702/132, 702/183, 702/185, 702/188, 324/500, 324/512, 324/522, 324/629, 738/630.1, 738/63
• US Class Current: 702/61
• CPC Class Codes: G01R 21/133 by using digital technique

Abstract

Power quality detection, monitoring, reporting, recording and communication in a revenue accuracy electrical power meter is disclosed. All recorded and computed data is moved to non-volatile storage via direct memory access transfer in the event that a power quality event jeopardizes the operating power of the meter. The meter provides a power supply utilizing high and low capacitive storage banks to supply sufficient energy to survive short duration power quality events which jeopardize the meter'"'"'s operating power. The power supply also enables the meter to initiate and complete a shut-down routine allowing the storage of he recorded and computed data. Further, a separate power supply utilizing a capacitive storage bank is utilized to operate a communications device when the operating power is lost. The communications device switches from the meter power supply to the alternate capacitive storage bank when an power outage occurs and then initiates a connection with an external network to report the loss of operating power and send the appropriate power management data.

Claims

1. An electricity meter comprising:

an input for receiving operating power from an external power source;

a metering circuit for measuring delivery of electrical energy; and

a communications device coupled with said input and operative to receive said operating power;

said communications device including a power supply, said power supply including;

at least one capacitor operative to store energy from said input when said operating power is received and supply said stored energy to said communications device when said operating power is not received;

logic coupled with said at least one capacitor and operative to monitor said power supply and signal said communications device when said stored energy runs low.

2. The electricity meter according to claim 1, said at least one capacitor being characterized by an effective series resistance (“

ESR”

) of less than 1.0 ohm and further characterized by a capacitance of at least 10 farads.

3. The electricity meter according to claim 1, wherein said communications device further comprises a boost converter, said boost converter operative to maintain a constant voltage from said at least one capacitor to said communications device.

4. The electricity meter according to claim 1, said communications device further comprising a charging circuit, said charging circuit operative to control said storage of energy by said at least one capacitor from said input.

5. The electricity meter according to claim 4, wherein said communications device is capable of operating from power received from at least one of said input and said at least one capacitor.

6. The electricity meter according to claim 4, further comprising a temperature sensor operative to measure temperature and wherein said capacitor is characterized by a voltage, and further wherein said charging circuit is disabled if said temperature and said voltage are above a pre-defined threshold.

7. The electricity meter according to claim 4 where said charging circuit is disabled if said external power source is disabled.

8. The electricity meter according to claim 1, wherein said communications device further comprises a modem.

9. The electricity meter according to claim 8 further wherein said modem is capable of connecting with a network.

10. The electricity meter according to claim 9 further wherein said network is the Internet.

11. The electricity meter according to claim 8 further wherein said modem connects with a telephone line.

12. The electricity meter according to claim 8 further wherein said modem connects with an internet service provider.

13. The electricity meter according to claim 1, wherein said communications device further comprises a network interface.

14. The electricity meter according to claim 1 wherein said communications device is operative to transmit a message when said external power source fails.

15. The electricity meter according to claim 14 wherein said message comprises an alert message.

16. The electricity meter according to claim 14 wherein said message comprises power outage data.

17. The electricity meter according to claim 1, wherein said communications device is removable.

18. The electricity meter according to claim 17 wherein said communications device is coupled with said electric meter via a communications interface, said communications device being characterized by a type, said communications interface further being capable of detecting said type of said communications device.

19. The electricity meter according to claim 1, said at least one capacitor being characterized by the ability to store at least 137.5 Joules of energy.

20. The electricity meter according to claim 1, wherein said communications device further comprises at least one of a RS232 port and RS485 port.

21. The electricity meter of claim 1, wherein said logic comprises a processor.

23. Tha apparatus according to claim 21, further wherein said capacitive energy store further comprises atm least one capacitor, said at least one capacitor characterized by at least 10 farads and an equivalent series resistance (”

ESR“

)of less than 1.0 ohm.

22. An apparatus for communicating data from an Intelligent Electronic Device (“

IED”

), said IED including a monitoring circuit for monitoring delivery of electrical energy, said apparatus comprising;

a communications device coupled with said IED and operative to receive data from said IED;

an input for receiving operating power from said IED; and

a power supply coupled with said input and said communications device, said power supply including;

a capacitive energy store operative to store energy iron said input when said input is providing power to said apparatus and further operative to supply said stored energy to said communications device when power from said input is interrupted;

logic coupled with said capacitive energy store and operative to monitor said power supply and signal said communications device when said stored energy runs low.

24. The apparatus according to claim 22 further wherein said IED is an electricity meter.

25. The apparatus according to claim 22 further wherein said IED is a relay.

26. The apparatus according to claim 22 further wherein said IED is a revenue meter.

27. The electricity meter according to claim 22, said at least one capacitor being characterized by the ability to store at least 137.5 Joules of energy.

28. The apparatus of claim 22, wherein said logic comprises a processor.

29. A method of communicating data from an energy meter coupled with an operating power source during a failure of said operating power source, said energy meter comprising a communications device, a metering circuit for measuring delivery of electrical energy and a power supply, said power supply including logic, the method comprising:

(a) charging an energy storage device from said operating power source, said energy storage device fixedly attached and coupled with said communications device;

(b) monitoring said energy meter for said failure;

(c) powering said communication device from said energy storage device during said power failure;

(d) transmitting a message with said communications device during said power failure; and

(e) signaling said communication device by said logic when said energy storage runs low.

30. The method of data communication in claim 29, said transmitting further comprising transmitting power outage data.

31. The method of data communication in claim 29, said transmitting further comprising transmitting an electronic mail message.

32. The method of data communication in claim 29, said charging further comprising charging at least one capacitor.

33. The method of data communication in claim 32, further wherein said capacitor is characterized by an equivalent series resistance (“

ESR”

) of less than 1.0 ohm and a capacitance of at least 10 farads.

34. The method of data communication in claim 29 comprising:

(e) storing power outage data.

35. The method of data communication in claim 29, said monitoring further comprising detecting said failure.

36. A revenue meter for measuring the delivery of electrical energy from an energy supplier to a consumer through an electric circuit, said revenue meter comprising:

bayonet terminals disposed on said revenue meter malleable with matching jaws of a detachable meter mounting device;

a seal connected between said revenue meter and said detachable meter mounting device, said seal operative to prevent removal of said revenue meter and indicate tampering with said revenue meter;

a metering circuit for measuring said delivery of electrical energy;

a communications device for reporting data from said revenue meter; and

a power supply coupled with said electric circuit and said metering circuit and operative to store energy from said electric circuit and provide said energy to said communications device when a power quality event occurs on said electric circuit to operate said communications device during said power quality event, said power supply including;

a high voltage portion coupled with said electric circuit;

a low voltage portion coupled with said high voltage portion and said metering circuit; and

a processor coupled with said high voltage portion and operative to monitor said power supply and signal said metering circuit when said stored energy runs low.

37. The revenue meter of claim 36 wherein said power supply comprises at least one capacitor.