Smart meters, and systems and method for electrical power reconnection

• US 9,213,387 B2
• Filed: 11/13/2012
• Issued: 12/15/2015
• Est. Priority Date: 11/14/2011
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: eMeter Corp (Siemens AG)
• Inventors: King, Christopher Slaboszewicz, Johnson, Larsh Maur
• Primary Examiner(s): Masinick, Michael D
• Application Number:
  US13/675,132
• Publication Number:
  US 20130123997A1
• Time in Patent Office: 1,127 Days
• Field of Search: 700/295
• US Class Current: 1/1
• CPC Class Codes: G01D 4/004 Remote reading of utility meters to a fixed location
• CPC Class Codes: G01R 22/10 using digital techniques
• CPC Class Codes: G06F 1/30 Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations for resetting only G06F1/24
• CPC Class Codes: H02H 1/043 to inrush currents H02H1/046 takes precedence; differential protection of transformers H02H7/045
• CPC Class Codes: H02H 3/24 responsive to undervoltage or no-voltage H02H3/207 takes precedence
• CPC Class Codes: H02H 3/247 having timing means
• CPC Class Codes: H02H 3/46 responsive to frequency deviations
• CPC Class Codes: H02J 13/00004 characterised by the power network being locally controlled
• CPC Class Codes: H02J 13/00006 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
• CPC Class Codes: H02J 13/0004 involved in a protection system
• CPC Class Codes: H02J 2310/16 The load or loads being an Information and Communication Technology [ICT] facility
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/30 Smart metering, e.g. specially adapted for remote reading

Abstract

An electrical power system having an electricity meter connected to power lines on one side and a load on the other side, the electricity meter having a processor and memory, a communications module, a sensor, and a service disconnect switch. The system has a communications and control system adapted to send information to the electricity meter and receive information from the electricity meter. The service disconnect switch is locally operable based on a preprogrammed time delay stored in the memory of the electricity meter to restore power in a controlled fashion following a power outage. Electricity meters and electricity reconnection methods are described, as are other aspects.

Claims

1. An electrical power system, comprising:

an electricity meter connected to power lines on one side and a load on another side, the electricity meter having

a meter housing,

a processor,

a memory,

a communications module,

a sensor, and

a service disconnect switch secured within a meter housing; and

a communication and control system of a utility configured and adapted to communicate with the communications module of the electricity meter to accomplish delayed power reconnection of the load through the electricity meter to the power lines after a time delay stored in memory of the electricity meter.

2. The electrical power system of claim 1 wherein the delayed power reconnection is after a predetermined time delay has elapsed.

3. The electrical power system of claim 1 wherein the communication and control system of the utility comprises:

a communications network for sending information and control signals to the electricity meter and receiving information from the electricity meter;

a communications computer server connected to the communications network to manage messages sent over the network;

a controls computer server for initiating control commands and other information to be sent to the electricity meter; and

a database device configured to store information about the electricity meter, the database storing time delays programmed into each electricity meter for use in automatic reconnection.

4. The electrical power system of claim 3 wherein the controls computer server is operational to automatically synchronize time delay values between the database device and the memory in the electricity meter by sending messages over the communications network.

5. The system of claim 1 wherein the electricity meter stores a time delay in the memory, and actuates the service disconnect switch after the time delay has elapsed to initiate automatic power reconnection between the power lines and load through the electricity meter.

6. The system of claim 1 wherein the electricity meter stores a time delay period in the memory, and actuates the service disconnect switch at a time within the time delay period to initiate automatic power reconnection actuates the service disconnect switch after the time delay has elapsed to initiate automatic power reconnection between the power lines and the load through the electricity meter.

7. The system of claim 1 wherein the service disconnect switch operates automatically to reconnect the load through the electricity meter to the power lines at a random time after a delay time stored in the memory of the electricity meter.

8. The system of claim 1 wherein the service disconnect switch operates automatically to reconnect the load through the electricity meter to the power lines at a random time within a delay period stored in the memory of the electricity meter.

9. The system of claim 1 wherein the communications module of the electricity meter is configured to

communicate with a customer-site electrical power generator on a load side of the electricity meter;

receive a message indicating a generator electrical frequency of an output of the customer-site electrical power generator;

sense frequency on the power lines on a line side of the electricity meter; and

automatically reconnect a load only when the frequency of both the customer-site electrical power generator and the power line is between an upper frequency bound and a lower frequency bound stored in the memory of the electricity meter.

10. The system of claim 9 wherein values of the upper frequency bound and the lower frequency bound of the electricity meter are also stored in a database device of the communication and control system wherein the upper frequency bound and the lower frequency bound are synchronized between the electricity meter and the database device via messages sent over a communications network to the electricity meter.

11. The system of claim 1 wherein the service disconnect switch is operable to automatically reconnect the load when a voltage on the power lines is within a threshold range stored in the memory of the electricity meter, and in accordance with the time delay programmed into the memory of the electricity meter.

12. The system of claim 1 wherein the service disconnect switch operates to reconnect the load through the electricity meter after a time delay following sensing sufficient voltage on the power lines.

13. The system of claim 1 wherein the sensor comprises a current, frequency, or voltage sensor.

14. An electricity meter, comprising:

a meter housing containing

a processor,

a memory configured to a store a time delay for reconnection,

a communications module,

a sensor configured to sense power availability, and

a service disconnect switch operable responsive to a signal from the processor to close the service disconnect switch after the time delay and reconnect power to a load through the electricity meter after the time delay.

15. The electricity meter, of claim 14, wherein

the memory is configured to a store frequency bounds;

and

the service disconnect switch is operable responsive to a signal from the processor to close the service disconnect switch after the time delay, when a generation frequency of a customer-site electrical power generator is within the frequency bounds, and when a generation frequency of power lines are within the frequency bounds.

16. An electricity reconnection method, comprising:

providing an electricity meter having a processor, a memory storing a time delay for reconnection of the electricity meter, a communications module, a sensor, and a service disconnect switch, the electricity meter being connected between a load and power lines;

sensing power availability on the power lines with the sensor; and

after sensing sufficient power availability, reconnecting the power to the load through the electricity meter after the time delay.

17. The method of claim 16 wherein the reconnecting comprises actuating the service disconnect switch after the time delay has elapsed to initiate automatic power reconnection between the load and the power lines through the electricity meter.

18. The method of claim 16 wherein the reconnecting comprises actuating the service disconnect switch at a time within a time delay period to initiate automatic power reconnection between the load and the power lines through the electricity meter.

19. The method of claim 18 wherein the reconnecting comprises actuating the service disconnect switch to reconnect power between the load and the power lines through the electricity meter at a random time within the time delay period.

20. The method of claim 16, wherein the reconnecting comprises:

communicating with a customer-site electrical power generator with the communication module of the electricity meter;

receiving a message indicating a generator electrical frequency of an output of the customer-site electrical power generator;

sensing a generation frequency on the power lines of the electricity meter; and

automatically reconnecting the load when the generator electrical frequency is between an upper frequency bound and a lower frequency bound stored in the memory of the electricity meter, and when the generation frequency of the power lines is within the upper frequency bound and the lower frequency bound.

21. The method of claim 16, wherein sensing sufficient power availability comprises measuring current falling within a current threshold range, measuring frequency falling within a frequency threshold range, or measuring voltage within a voltage threshold range.

22. The method of claim 16, wherein the reconnecting comprises:

determining a generator electrical frequency of an output of the customer-site electrical power generator;

determining a generation frequency of the power lines coupled to the electricity meter; and

automatically reconnecting the load when the generator electrical frequency is between an upper frequency bound and a lower frequency bound stored in the memory of the electricity meter, and when the generation frequency of the power lines is between the upper frequency bound and the lower frequency bound.

23. The method of claim 22, wherein the reconnecting comprises:

determining a generator phase of the output of the customer-site electrical power generator;

determining a power utility grid phase of the power lines coupled to the electricity meter, and

automatically reconnecting the load when the generator phase is within limits of the power utility grid phase.

24. The method of claim 22, wherein the reconnecting comprises:

toggling the service disconnect switch when the generator electrical frequency that is within +/−

15% of the generation frequency of the power lines.

25. The method of claim 22, wherein the reconnecting comprises:

toggling the service disconnect switch when a generator phase of the customer-site electrical power generator is within limits of a power utility grid phase of the power lines.

26. The method of claim 25, wherein the reconnecting takes place when the generator phase is within about +/−

18 degrees phase from the power utility grid phase.

27. An electrical power system, comprising:

an electricity meter connected to power lines on a line side and a load on a load side, the electricity meter having

a meter housing,

a processor,

a memory,

a communications module,

a sensor, and

a service disconnect switch secured within the meter housing; and

a communication and control system of a utility configured and adapted to communicate with the communications module of the electricity meter to accomplish delayed power reconnection of the load through the electricity meter to the power lines after a time delay stored in memory of the electricity meter,

wherein the communications module of the electricity meter is configured to;

communicate with a customer-site electrical power generator on the load side of the electricity meter,

receive a message indicating a generator electrical frequency and phase of an output of the customer-site electrical power generator,

sense the frequency and phase on the line side of the electricity meter, and

automatically reconnect when the frequency and phase of both the customer-site electrical power generator and the power lines are within limits stored in the memory of the electricity meter.