Method of and system for accumulating verifiable energy demand data from remote electricity meters

• US 4,639,728 A
• Filed: 09/16/1985
• Issued: 01/27/1987
• Est. Priority Date: 09/16/1985
• Status: Expired due to Term

• Current Assignee: Itron Electricity Metering, Inc. (Itron, Inc.)
• Original Assignee: Sangamo Weston, Inc.
• Inventors: Swanson, Scott C.
• Primary Examiner(s): Myracle, Jerry W.
• Application Number:
  US06/776,719
• Time in Patent Office: 498 Days
• Field of Search: 340/870.02, 340/870.03, 340/310 A, 340/870.11, 340/870.19, 324/137, 324/141, 324/142, 179/2 AM, 179/4
• US Class Current: 340/870.03
• CPC Class Codes: G01R 11/64 Maximum meters, e.g. tariff for a period is based on maximum demand within that period
• CPC Class Codes: G01R 21/008 Measuring maximum demand

Abstract

Pulses generated by the pulse initiator of an electricity meter (30) are counted during successive measurement intervals. The pulse count for each interval is stored in the solid state memory (42) of a recorder (10), to be thereafter transmitted to a central computer and printed and/or displayed to obtain energy demand survey and billing data. The operation of the recorder is controlled by a programmable microprocessor (38). To verify the accuracy of the pulses counted during each interval, the counts are accumulated over a predetermined number of successive intervals constituting a record. The accumulated count is compared with an encoded register reading obtained from the meter (30) at the end of the record. If there is acceptable correlation between the accumulated count and encoded meter reading, the interval pulse counts associated with that record are deemed verified. Power for the recorder (10) is obtained from the powerline, except during power outages in which case a rechargeable battery (28) provides back-up power. Battery charging is under the control of the microprocessor.

Claims

1. A system for accumulating verifiable energy demand data from a remote electricity meter of a type having at least one register indicating accumulated demand and generating pulses corresponding to demand rate, comprising:

means for detecting pulses generated by said meter;

means for counting the pulses detected by said detecting means during a predetermined measurement interval to develop an interval pulse count;

means for digitally encoding an output of said register;

means for reading an output of said encoding means at the last of a predetermined number of measurement intervals;

solid state memory means for storing data; and

means for storing interval pulse counts and encoded register readings in different addressable locations of said memory means.

2. The system of claim 1, including:

means for reading said addressable memory locations representing interval pulse counts for a predetermined number of intervals, said intervals constituting a record, together with an associated encoded register reading;

means for accumulating pulse counts during said record; and

means for correlating said encoded register reading with said accumulated pulse counts to verify said accumulated pulse counts.

3. The system of claim 2, wherein said correlating means is at a central computer, and said reading means includes means for transmitting data read from said memory means to said central computer over telephone lines.

4. The system of claim 2, wherein said correlating means is at a central computer, and said reading means includes means for converting data read from said memory means into optically transmittable data;

and further including means for transmitting said optical data to a portable data receiver, said portable data receiver including;

means for converting said optical data into corresponding electrical signals;

means for storing said electrical signals; and

means for transferring data stored in said portable data receiver to said central computer.

5. The system of claim 2, including:

means for converting pulse counts read from said memory means into energy demand data;

means responsive to said accumulated pulse count and said encoded register reading for verifying said energy consumption data and developing corresponding reliability data; and

means for displaying said energy consumption data and corresponding reliability data.

6. The system of claim 1, including further means for storing periodically in said memory means data identifying a current time.

7. The system of claim 1, including:

means for accumulating interval counts for a predetermined number of intervals constituting a record;

means for determining the difference between (1) a pulse count accumulated to the end of a current record, and (2) a pulse count accumulated to the end of the previous record; and

means for comparing said difference to the accumulated pulse count of only the current record to verify the current record.

8. The system of claim 1, wherein said memory is powered by a battery during a power outage, and including means for recharging said battery following the power outage, said recharging means including means for measuring a time period of said power outage, calculating a period of time required to recharge the battery at a predetermined rate of recharge, and, in response, controlling said recharging means.

9. A method of accumulating verifiable energy demand data from a remote electricity meter of a type generating electrical pulses as a function of energy demand at the site of the meter and having at least one register providing an indication of accumulated energy demand, comprising the steps of;

detecting electrical pulses generated by said meter;

counting said pulses during a predetermined measurement interval to develop an interval pulse count;

accumulating pulse counts over a predetermined number of intervals constituting a record to obtain an accumulated pulse count;

digitally encoding the output of the register;

reading the digitally encoded output at the end of each record; and

comparing the encoded register reading with said accumulated pulse count to verify the pulse counts developed during the current record.

10. The method of claim 9, including the steps of:

converting said pulse count into energy demand data and displaying said energy demand data corresponding to each measurement interval within a record; and

displaying an indication of verification of the energy demand data over the corresponding record interval.

11. The method of claim 9, including the step of displaying the current time associated with each record.

12. The method of claim 9, including the steps of:

determining the difference between (1) a pulse count accumulated to the end of a current record and (2) a pulse count accumulated to the end of a previous record; and

comparing said difference to the accumulated pulse count of the current record to verify the accuracy of the current record.