Remote meter reading system providing demand readings and load control from conventional KWH meters

• US 4,213,119 A
• Filed: 11/07/1977
• Issued: 07/15/1980
• Est. Priority Date: 04/29/1976
• Status: Expired due to Term

• Current Assignee: Western Bank Las Cruces
• Original Assignee: Energy Optics, Inc. (American Millennium Corporation Incorporated)
• Inventors: Ward, Steven M., Ward, Ernest M., Dils, Michael A.
• Primary Examiner(s): Yusko, Donald J.
• Application Number:
  US05/848,998
• Time in Patent Office: 981 Days
• Field of Search: 340/152, 340/157, 340/150, 340/152 R, 340/152 T
• US Class Current: 340/870.02
• CPC Class Codes: G01D 4/006 Remote reading of utility meters to a non-fixed location, i.e. mobile location
• CPC Class Codes: G01D 4/008 Modifications to installed utility meters to enable remote reading
• CPC Class Codes: G08C 23/04 using light waves, e.g. infrared
• CPC Class Codes: H04B 10/1143 Bidirectional transmission
• CPC Class Codes: H04Q 9/14 Calling by using pulses
• 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 20/30 Smart metering, e.g. specially adapted for remote reading

Abstract

An electro-optical remote meter reading system providing automatic load control and time related and peak demand readings from conventional electric power meters, including an electro-optical monitor unit having a non-contact meter scanner providing meter data to a digital storage and readout unit, and an electro-optical transponder effective to receive and to transfer data from the latter unit and to convert such data into a train of laser radiation pulses which are emitted in response to interrogation by a laser radiation pulse from a remote mobile interrogator unit which triggers the noncoded interrogation of the transponder. The interrogator includes a laser receiver and a pulse converting sub-system and is associated with further digital data processing equipment. A variant of the reading system interacts with a plurality of meters in a common location and provides sequential interrogation of a common, i.e. single, transponder, associated with the plurality of meters.

Claims

1. An electro-optical remote electrical utility meter reading system comprising:

first means generating a plurality of signals with each signal representing a predetermined quantity of the utility measured and with the number of signals generated being quantitatively in direct proportion to the utility measured by the meter;

second means associated with said first means and being adapted to convert said signals into digital pulses;

third means having a memory receiving and storing said digital pulses;

fourth means having a memory module with logic circuitry providing time correlated intelligence reflecting the rate at which increments of electrical power are consumed;

fifth means comprising an electro-optical transponder effective in response to interrogation by laser radiation pulses to cause said third means to transfer pulses from said third means to said fifth means, and to emit said pulses in the form of laser radiation;

sixth means comprising an interrogator at a location remote from said transponder to trigger said interrogation and to receive said pulses from said transponder;

seventh means receiving signals from said interrogator for selectively providing intelligence reflecting the measured quantities.

2. A system according to claim 1, wherein said fourth means includes circuitry providing a digital representation of utility consumed during multiple, mutually exclusive time of day periods.

3. A system according to claim 2, wherein mutually exclusive time of day periods consist of three, eight-hour periods.

4. A system according to claim 1, wherein said fourth means includes circuitry providing a digital representation of electrical power consumption rate.

5. A system according to claim 4, wherein said consumption rate is determined by counting the number of electrical meter calibration wheel revolutions occuring during a fifteen-minute period.

6. A system according to claim 1, wherein said fourth means includes digital comparator circuitry and memory registers effective to store the maximum utility demand rate occuring during a billing period.

7. A system according to claim 1, wherein said fourth means includes fixed threshold comparator circuitry and memory registers effective to store the total utility consumed at a rate exceeding a predetermined critical threshold.

8. A system according to claim 1, wherein said third means includes a master nonvolatile memory storing the total accumulated meter reading in conjunction with said fourth means with memories storing the total utility consumed at a rate exceeding a predetermined critical threshold and the maximum value of consumption rate for a given billing period.

9. A system according to claim 1, wherein said fourth means includes a fixed threshold comparator circuit effective to provide a load control output when utility is consumed at a rate exceeding a predetermined critical value.

10. A system according to claim 9, wherein said output control is automatic and comprises a digital load control command effective to disconnect predetermined increments of the metered load.

11. A system according to claim 9, wherein said output control comprises an electronic signal effective to drive biofeedback indicators informing the consumer that the consumption rate exceeds the critical value.

12. A system according to claim 1, wherein said third means includes a master nonvolatile memory storing the total accumulated meter reading in conjunction with said fourth means wherein memories store meter readings accumulated during three unique eight hour periods daily.

13. An electrooptical remote meter reading system, in which the meter or status indicator has a mechanical representation, comprising;

a monitor unit effective to count increments of movement comprising electro-optical light radiation monitoring and digital storage means being effective to electro-optically detect a change in the mechanical representation and to translate such change into electronic didigral pulses, digital circuitry to manipulate said digital pulses to provide representations of utility consumption rate and wherein said digital circuitry brackets utility consumed into mutually exclusive, time of day storage registers;

and digital memories to store the digital representations, said monitor unit further including electro-optical transponder means for receiving said digital pulses from said transponder means for receiving said digital pulses from said storage means, converting said digital pulses into light radiation and for transmitting said radiation, said radiation being a carrier for a train of pulses; and

remote electro-optical interrogator means located at a point spaced from said monitor unit and effective to electro-optically trigger said transponder and to receive said train of pulses from said transponder.

14. A system according to claim 13 wherein said digital circuitry determines the maximum utility consumption rate during a billing period.

15. A system according to claim 13, wherein said digital circuitry stores the total utility consumed at a rate exceeding a predetermined threshold value.

16. A system according to claim 13, wherein said digital circuitry provides a digital alarm output whenever utility consumption rate exceeds a predetermined critical value.