Metering system

• US 6,492,910 B1
• Filed: 05/03/2000
• Issued: 12/10/2002
• Est. Priority Date: 02/07/1996
• Status: Expired due to Term

• Current Assignee: Landis+Gyr Inc. (Landis+Gyr Group AG)
• Original Assignee: Schlumberger Resource Management Services Incorporated (Schlumberger NV)
• Inventors: Hayes, Robert A., Ragle, Steven J., Johnson, Larsh M., King, Christopher S.
• Primary Examiner(s): Edwards, Jr., Timothy
• Application Number:
  US09/564,223
• Time in Patent Office: 951 Days
• Field of Search: 340/870.02, 340/870.03, 340/870.11, 702/57, 702/61
• US Class Current: 340/870.02
• CPC Class Codes: G08C 15/06 successively, i.e. using time division
• CPC Class Codes: H04Q 2209/40 using a wireless architecture
• CPC Class Codes: H04Q 2209/60 for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

A metering system provides a measuring level with multiple meters and a collection level with multiple collectors. Each meter periodically measures a parameter, such as electricity consumption, and stores measurement information. Each meter periodically transmits its stored measurement information to a collector by a wireless signal. When a collector receives a transmission, it determines which meter sent the transmission, and then extracts unprocessed measurement information. The collector then processes the measurement information to generate a metered function, such as a load profile, a time-of-use profile, or a demand profile. The collector can compensate for missed transmissions and power failures. The metered functions for each meter are transmitted from the collectors to a monitoring station.

Claims

1. A data collection system, comprising a collector having a receiver configured to receive data transmitted by a plurality of sensors each of which is configured to sample a parameter value at discrete measurement times, a processor configured to generate a summary profile of data received by the receiver from the plurality of sensors, and a transmitter configured to transmit the summary profile to a monitoring station.

2. The data collection system of claim 1, wherein the processor is configured to generate a load profile from data received by the receiver.

3. The data collection system of claim 1, wherein the processor is configured to generate a demand profile from data received by the receiver.

4. The data collection system of claim 1, wherein the processor is configured to generate a time-of-use profile from data received by the receiver.

5. The data collection system of claim 1, wherein the processor is configured to estimate information contained in data which was transmitted by a given sensor but which was not received by the collector based upon data previously received by the collector from the given sensor.

6. The data collection system of claim 1, wherein each sensor comprises:

a clock for identifying a sequence of time intervals and for identifying a sequence of data collection periods each corresponding to a plurality of time intervals; and

a memory configured to store a plurality of data measurements, each sensor storing a data measurement in memory at the end of each time interval, and each sensor transmitting the plurality of stored data measurements after each data collection period, the number of stored data measurements transmitted during each transmission being greater than the number of time intervals in the data collection period.

7. The data collection system of claim 1, further comprising a plurality of sensors each having a meter configured to sample a parameter value at discrete measurement times and a transmitter configured to transmit data measured by the meter.

8. The data collection system of claim 7, wherein each sensor periodically transmits a plurality of data measurements during a current data collection period and, with each transmission, each sensor transmits a measure of the delay from the time a failure power was detected to the time of a transmission after power was restored.

9. The data collection system of claim 7, wherein each sensor periodically transmits a plurality of data measurements during a current data collection period and, with each transmission, each sensor transmits a signal indicative of whether a power failure occurred during the current data collection period.

10. The data collection system of claim 9, wherein the collector processor is configured to define a recovery period that includes one or more power failure indications.

11. The data collection system of claim 10, wherein the collector processor is configured to estimate information contained in missing measurements based upon information extracted from the beginning and the end of the recovery period.

12. The data collection system of claim 7, wherein each sensor is configured to redundantly transmit measured data to the collector.

13. The data collection system of claim 7, wherein the processor is configured to determine whether data is missing from a transmission received from a sensor.

14. The data collection system of claim 13, wherein each sensor periodically transmits a plurality of data measurements during a current data collection period and, with each transmission, each sensor transmits a sequence number representing the order and the number of measurements made by the sensor during the current data collection period.

15. The data collection system of claim 14, wherein the collector determines whether data is missing based upon a comparison of the sequence numbers contained in a current transmission and in a previous transmission.

16. A data collection system, comprising:

a plurality of measurement sensors each located near a consumer of electricity and configured to measure data relating to consumer usage of electricity and further configured to transmit measured electricity usage data; and

a collector having a receiver configured to receive electricity usage data transmitted by the plurality of sensors, a processor configured to compute electricity usage information from electricity usage data received by the receiver, and a transmitter configured to transmit the electricity usage information to a monitoring station.

17. The data collection system of claim 16, wherein the computed electricity usage information is a load profile.

18. The data collection system of claim 16, wherein the computed electricity usage information is a demand profile.

19. The data collection system of claim 16, wherein the computed electricity usage information is a time-of-use profile.

20. The data collection system of claim 16, further comprising a plurality of collectors each configured to generate electricity usage information from data received from a subset of the plurality of the sensors.

21. The data collection system of claim 20, further comprising a monitoring station configured to process electricity usage information received from each of the collectors.

22. A data collection system, comprising:

a plurality of measurement sensor means each located near a consumer of electricity for measuring data relating to consumer usage of electricity and for transmitting the measured electricity usage data; and

a collector means having a receiver for receiving electricity usage data transmitted by the plurality of sensor means, a processor for computing electricity usage information from electricity usage data received by the receiver, and a transmitter for transmitting the electricity usage information to a monitoring station.