Apparatus and system for protection, control, and management of electricity distribution systems using time synchronization

• US 20030220752A1
• Filed: 10/15/2002
• Published: 11/27/2003
• Est. Priority Date: 02/12/1997
• Status: Abandoned Application

• Current Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Original Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Inventors: Hart, Ronald G.
• Application Number:
  US10/271,167
• Publication Number:
  US 20030220752A1
• Time in Patent Office: Days
• US Class Current: 702/61
• CPC Class Codes: G01D 4/004 Remote reading of utility meters to a fixed location
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: G01R 22/10 using digital techniques
• CPC Class Codes: H02H 1/0061 concerning transmission of signals transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• 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: Y02E 40/70 Smart grids as climate change mitigation technology in the energy generation sector
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
• CPC Class Codes: Y04S 10/00 Systems supporting electrical power generation, transmission or distribution
• CPC Class Codes: Y04S 10/22 Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
• CPC Class Codes: Y04S 20/30 Smart metering, e.g. specially adapted for remote reading

Abstract

A phasor monitoring system and apparatus for use with a distribution system for electricity wherein periodic three phase electricity is distributed in a plurality of circuits. The phasor monitoring apparatus comprises a phasor transducer that has an input that receives analog signals representative of parameters of electricity in a circuit of the distribution system, an analog to digital converter that receives the analog signals and outputs a digital data signal representative of the analog signals, a processor coupled to the analog to digital converter to receive the digital data signal output from the analog to digital converter, programming on the processor that computes phasor data representative of the electricity in the circuit based on the digital data received from the analog to digital converter and provides a digital output representative of the phasor data, and a network-compatible port coupled to the processor to transmit the phasor data onto a data network coupled thereto. The phasor monitoring system comprises a data network interconnecting a plurality of phasor transducers each associated with one of the circuits of an electricity distribution system. A phasor array processor is connected to the data network and receives phasor data from a plurality of the phasor transducers connected to the network. The phasor array processor computes combined phasor data for the plurality based upon the phasor data received from the plurality of phasor transducers.

Claims

1. A device for measuring electrical energy in an electric circuit, said device comprising:

at least one sensor coupled with said electric circuit and operative to sense at least one electrical parameter in said electric circuit and generate at least one analog signal indicative thereof;

at least one analog to digital converter coupled with said at least one sensor and operative to convert said at least one analog signal to at least one digital sample;

a time synchronization receiver operative to generate a time synchronization signal; and

a processor coupled with said at least one analog to digital converter and said time synchronization receiver, said processor operative to alter a timing clock signal based on said time synchronization signal.

2. The device of claim 1 further comprising a local synchronization circuit coupled with said processor which outputs said timing clock signal to said processor.

3. The device of claim 1, wherein said time synchronization receiver is further coupled with a communications network.

4. The device of claim 3, wherein said time synchronization receiver is operative to transmit said time synchronization signal onto said communications network.

5. The device of claim 1, wherein said time synchronization signal comprises a network time signal.

6. The device of claim 1, wherein said time synchronization signal comprises an external time synchronization signal generated externally to said device.

7. The device of claim 1, wherein said time synchronization receiver comprises a GPS receiver operative to receive a GPS signal.

8. The device of claim 7, wherein said GPS receiver is operative to wirelessly receive said GPS signal.

9. The device of claim 1, wherein said device is an energy meter.

10. The device of claim 1, wherein said device is a phasor transducer.

11. The device of claim 1, wherein said processor is further operative to timestamp data based on said time synchronization signal.

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

a digital network;

at least one device coupled with said digital network, said devices comprising;

at least one sensor coupled with said electric circuit and operative to sense at least one electrical parameter in said electric circuit and generate at least one analog signal indicative thereof;

at least one analog to digital converter coupled with said at least one sensor and operative to convert said at least one analog signal to at least one digital sample;

a time synchronization receiver operative to generate a time synchronization signal; and

a processor coupled with said at least one analog to digital converter and said time synchronization receiver, said processor operative to alter a timing clock signal based on said time synchronization signal.

13. The system of claim 12, wherein said processor is further operative to timestamp said at least one digital sample based on said time synchronization signal.

14. The system of claim 12, wherein said processor is further operative to transmit said timestamped at least one digital sample onto said digital network.

15. The system of claim 14, wherein said processor is operative to perform a function on said timestamped at least one digital sample.

16. The system of claim 14, wherein said time synchronization receiver comprises a GPS receiver operative to receive a GPS signal.

17. The system of claim 16, wherein said GPS receiver is operative to wirelessly receive said GPS signal.

18. A method for measuring electrical energy in an electric circuit, said method comprising:

(a) sensing at least one electrical parameter in said electric circuit and generating at least one analog signal indicative thereof;

(b) converting said at least one analog signal to at least one digital sample;

(c) generating a time synchronization signal; and

(d) altering a timing clock signal based on said time synchronization signal.

19. The method of claim 18 further comprising timestamping said at least one digital sample based on said time synchronization signal.

20. The method of claim 18 further comprising transmitting said time synchronization signal onto a communications network.

21. The method of claim 18 wherein c) further comprises communicating with an external time synchronization device.

22. A device for measuring electrical energy in an electric circuit, said device comprising:

sensing means for sensing at least one electrical parameter in said electric circuit and generate at least one analog signal indicative thereof;

converting means for converting said at least one analog signal to at least one digital sample;

synchronization means for generating a time synchronization signal; and

processing means for altering a timing clock signal based on said time synchronization signal.