Test pulses for enabling revenue testable panel meters

• US 7,508,190 B2
• Filed: 12/22/2005
• Issued: 03/24/2009
• Est. Priority Date: 10/20/2004
• Status: Expired due to Fees

• Current Assignee: EI Electronics LLC (Hubbell, Inc.)
• Original Assignee: Electro Industries/Gaugetech
• Inventors: Kagan, Erran, Banhegyesi, Tibor
• Primary Examiner(s): Nguyen; Ha Tran T
• Assistant Examiner(s): Vazquez; Arleen M
• Application Number:
  US11/317,227
• Publication Number:
  US 20060170409A1
• Time in Patent Office: 1,188 Days
• Field of Search: 324/74, 324/134, 324/142, 324/76.11, 702/61, 702/60, 361/659
• US Class Current: 324/142
• CPC Class Codes: G01R 35/04 of instruments for measuring time integral of power or current

Abstract

A panel meter including an energy test pulse device that enables the panel meter to be used for revenue applications and eliminates the need for two separate meters, one for panel indication, and the other for energy and revenue applications. The electrical panel meter including at least one sensor configured for measuring an electrical parameter; at least one analog-to-digital converter coupled to the at least one sensor for converting the measured electrical parameter to a digital signal; a display for continuously displaying at least one electrical parameter; a processor configured to receive the digital signal and calculate an amount of energy consumed; and a test pulse circuit configured to receive the calculated amount and generate a plurality of pulses equal to the calculated amount, wherein each of the plurality of pulses is equal to a predetermined amount of energy.

Claims

1. An electrical panel metering device comprising:

a housing including a front face panel configured to facilitate mounting of the panel metering device in a cut-out of an indication panel;

at least one sensor configured for measuring an electrical parameter;

at least one analog-to-digital converter coupled to the at least one sensor for converting the measured electrical parameter to a digital signal;

a display disposed on the front face panel of the housing for continuously displaying at least one electrical parameter;

a processor configured to receive the digital signal and calculate an amount of energy consumed for revenue metering; and

a test pulse circuit configured to receive the calculated amount and generate a plurality of pulses equal to the calculated amount, wherein each of the plurality of pulses is equal to a predetermined amount of energy accumulated, wherein the test pulse circuit includes an LED disposed on the front face panel of the housing to generate infrared pulses from the plurality of pulses for verifying the accuracy of the panel metering device with an external reference standard device.

2. The panel metering device of claim 1, wherein the at least one analog-to digital converter has 24 bit resolution.

3. The panel metering device of claim 1, wherein the at least one analog-to digital converter has a sampling rate of 400 samples per cycle.

4. The panel metering device of claim 1, wherein the test pulse circuit further comprises a divider for receiving the calculated amount from the processor, generating the plurality of pulses and transmitting the pulses to the LED wherein said divider slows said plurality of pulses'"'"' rate to accommodate testing by conventional testing equipment.

5. The panel metering device of claim 4 wherein said conventional testing equipment includes calibration equipment.

6. The panel metering device of claim 1, wherein the at least one analog-to digital converter, the processor, and the test pulse circuit are disposed on a single integrated circuit.

7. The panel metering device of claim 1, wherein the display is configured to continuously and simultaneously display at least three electrical parameters.

8. The panel metering device of claim 7, wherein the display further comprising a % load bar display.

9. An electrical panel metering device comprising:

a housing including a front face panel configured to facilitate mounting of the panel metering device in a cut-out of an indication panel;

at least one sensor configured for measuring an electrical parameter;

at least one analog-to-digital converter coupled to the at least one sensor for converting the measured electrical parameter to a digital signal;

a display disposed on the front face panel of the housing for continuously displaying at least one electrical parameter;

a processor configured to receive the digital signal, calculate an amount of energy consumed for revenue metering and generate a plurality of pulses equal to the calculated amount;

a test pulse circuit configured to receive the plurality of pulses and outputting the plurality of pulses at an input rate of an external conventional reference standard device; and

a light emitting diode disposed on the front face panel of the housing and coupled to the test pulse circuit for receiving the plurality of pulses and generating a plurality of infrared pulses for verifying the accuracy of the panel metering device with the external conventional reference standard device.

10. The panel metering device of claim 9, wherein the at least one analog-to-digital converter has a sampling rate of 400 samples per cycle.

11. An electrical panel metering device comprising:

a housing including a front face panel configured to facilitate mounting of the panel metering device in a cut-out of an indication panel;

three current sensors configured for measuring current on each of three phases of an electrical distribution system;

three voltage sensors configured for measuring voltage on each of three phases of an electrical distribution system;

six analog-to-digital converters for converting the measured electrical parameters to digital signals, each analog-to-digital converter coupled to one of the three current sensors and three voltage sensors;

a display disposed on the front face panel of the housing for continuously displaying at least three electrical parameters;

a processor configured to receive the digital signals and calculate an amount of energy consumed for revenue metering;

a test pulse circuit configured to receive the calculated amount and generate a plurality of pulses equal to the calculated amount, wherein each of the plurality of pulses is equal to a predetermined amount of energy accumulated; and

a light emitting diode disposed on the front face and coupled to the test pulse circuit for receiving the plurality of pulses and generating a plurality of infrared pulses for verifying the accuracy of the panel metering device with an external reference standard device.