Method of generating electrical energy metering quantities in a multi-channel load profile recorder

• US 5,546,318 A
• Filed: 12/16/1994
• Issued: 08/13/1996
• Est. Priority Date: 12/16/1994
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Lee, Robert E. Jr.
• Primary Examiner(s): Voeltz, Emanuel T.
• Assistant Examiner(s): Wachsman, Hal D.
• Application Number:
  US08/357,583
• Time in Patent Office: 606 Days
• Field of Search: 364/480-483, 364/492, 340/870.02, 324/113, 324/114, 324/116, 324/103 R, 324/74, 324/130, 324/142, 324/141
• US Class Current: 702/61
• CPC Class Codes: G01R 21/133 by using digital technique

Abstract

A method of generating electrical energy metering quantities in a multi-channel load profile recorder includes the steps of sensing a line quantity such as a line current and/or a line voltage, during a load profile time interval. Non-derived electrical energy metering quantities such as watt-hours, var-hours, volt² -hours, ampere² -hours, etc., are then generated upon completion of the load profile time interval. The non-derived quantities are determined from the sensed line quantities and are preferably stored in non-volatile programmable read-only memory (PROM) in the recorder. These steps are then repeated for each of the subsequent consecutive time intervals so that a load profile record or "database" of non-derived metering quantities can be established in the memory. This record can then be retrieved on a periodic basis by a utility field operator, preferably using a hand-held or portable programming unit such as a computer. At the time of retrieval, the internal load profile record is supplemented by the generation and transfer of derived electrical energy metering quantities, such as volt-ampere-hours (VAh) and power factor (PF). These derived quantities are determined from the respective non-derived electrical energy metering quantities, for each of the recorded load profile time intervals. The generation and transfer of the derived electrical energy metering quantities preferably takes place at the time the non-derived quantities are downloaded from internal memory and transferred to the programming unit.

Claims

1. A method of generating electrical energy metering quantities in a multi-channel load profile recorder, comprising the steps of:

sensing a line current and a line voltage transferred from a line to a load during a first load profile time interval;

generating at least one first electrical energy metering quantity based on the sensed line current and the sensed line voltage, upon completion of the first load profile time interval;

storing the first electrical energy metering quantity in a programmable memory portion of the multi-channel load profile recorder;

transferring the first electrical energy metering quantity from the programmable memory portion of the multi-channel load profile recorder to a storage unit located external to the multi-channel load profile recorder;

contemporaneously with said first electrical energy metering quantity transferring step, generating, internal to the multi-channel load profile recorder, at least one second electrical energy metering quantity corresponding to the first load profile time interval from the first electrical energy metering quantity; and

then

transferring the second electrical energy metering quantity from the multi-channel load profile recorder to the storage unit.

2. The method of claim 1, wherein said storing step comprises the step of storing the first electrical energy metering quantity in a programmable memory portion of the multi-channel load profile recorder during a second load profile time interval, subsequent to the first load profile time interval;

and wherein said second electrical energy metering quantity generating step is performed subsequent to the second load profile time interval.

3. The method of claim 2, wherein said first electrical energy metering quantity generating step comprises the step of generating a watt-hour metering quantity for the first load profile time interval, based on the sensed line current and the sensed line voltage.

4. The method of claim 3, wherein said first electrical energy metering quantity generating step further comprises the steps of generating electrical energy metering quantities selected from the group consisting of, ampere² -hour, and volt² -hour, for the first load profile time interval;

and wherein said storing step further comprises the step of storing the electrical energy metering quantities in the programmable memory portion of the multi-channel load profile recorder.

5. The method of claim 4, wherein said second electrical energy metering quantity generating step comprises the step of generating a volt-ampere-hour metering quantity from the stored electrical energy metering quantities.

6. The method of claim 5, wherein said second electrical energy metering quantity generating step further comprises the step of generating a power factor metering quantity from the stored electrical energy metering quantities and the volt-ampere-hour metering quantity.

7. A method of generating electrical energy metering quantities in a multi-channel load profile recorder, comprising the steps of:

sensing a line quantity transferred from a line to a load during a first load profile time interval, said line quantity selected from the group consisting of line current and line voltage;

generating a first electrical energy metering quantity based on the sensed line quantity, upon completion of the first load profile time interval;

storing the first electrical energy metering quantity in the multi-channel load profile recorder during a second load profile time interval, subsequent to the first load profile time interval;

transferring the first electrical energy metering quantity from the multi-channel load profile recorder to a storage unit located external to the multi-channel load profile recorder, subsequent to the second load profile time interval; and

contemporaneously with said first electrical energy metering quantity transferring step, generating a second electrical energy metering quantity corresponding to the first load profile time interval from the first electrical energy metering quantity.

8. The method of claim 7, wherein said second electrical energy metering quantity generating step is performed subsequent to the second load profile time interval and comprises the step of generating, internal to the multi-channel load profile recorder, a second electrical energy metering quantity corresponding to the first load profile time interval, based on the first electrical energy metering quantity.

9. The method of claim 8, further comprising the step of transferring the second electrical energy metering quantity from the multi-channel load profile recorder to the storage unit.

10. The method of claim 8, wherein said first electrical energy metering quantity generating step comprises the step of generating a watt-hour metering quantity for the first load profile time interval, based on the sensed line quantity.

11. The method of claim 10, wherein said first electrical energy metering quantity generating step further comprises the steps of generating electrical energy metering quantities selected from the group consisting of ampere-hour, ampere² -hour, volt-hour and volt² -hour, for the first load profile time interval;

and wherein said storing step further comprises the step of storing the electrical energy metering quantities in a programmable memory portion of the multi-channel load profile recorder.

12. The method of claim 11, wherein said second electrical energy metering quantity generating step comprises the step of generating a volt-ampere-hour metering quantity from the stored electrical energy metering quantities.

13. The method of claim 12, wherein said second electrical energy metering quantity generating step further comprises the step of generating a power factor metering quantity from the stored electrical energy metering quantities and the volt-ampere-hour metering quantity.

14. The method of claim 7, wherein said second electrical energy metering quantity generating step is performed subsequent to the second load profile time interval and comprises the step of generating, external to the multi-channel load profile recorder, a second electrical energy metering quantity corresponding to the first load profile time interval, based on the first electrical energy metering quantity.

15. A method of generating electrical energy metering quantities in a multi-channel load profile recorder, comprising the steps of:

sensing a line current and a line voltage transferred from a line to a load during a first load profile time interval;

generating a plurality of non-derived electrical energy metering quantities based on the sensed line current and the sensed line voltage, upon completion of the first load profile time interval;

storing the plurality of non-derived electrical energy metering quantities in a programmable memory portion of the multi-channel load profile recorder;

transferring the non-derived electrical energy metering quantities from the programmable memory portion of the multi-channel load profile recorder to a storage unit located external to the multi-channel load profile recorder;

contemporaneously with said non-derived electrical energy metering quantities transferring step, generating, internal to the multi-channel load profile recorder, a plurality of derived electrical energy metering quantities which correspond to the first load profile time interval from the non-derived electrical energy metering quantities; and

then

transferring the derived electrical energy metering quantities from the multi-channel load profile recorder to the storage unit without storing them in a programmable memory portion of the multi-channel load profile recorder.

16. The method of claim 15, wherein said storing step comprises the step of storing the non-derived electrical energy metering quantities in a programmable memory portion of the multi-channel load profile recorder during a second load profile time interval, subsequent to the first load profile time interval;

and wherein said derived electrical energy metering quantities generating step is performed subsequent to the second load profile time interval.

17. The method of claim 16, wherein said non-derived electrical energy metering quantities generating step comprises the step of generating electrical energy metering quantities selected from the group consisting of watt-hour, var-hour, ampere² -hour and volt² -hour, for the first load profile time interval.

18. The method of claim 17, wherein said derived electrical energy metering quantities generating step comprises the steps of generating a volt-ampere-hour metering quantity and a power factor metering quantity from the stored non-derived electrical energy metering quantities.