Voltage scanning, measurement, storage and reporting device

• US 6,360,177 B1
• Filed: 01/02/1998
• Issued: 03/19/2002
• Est. Priority Date: 11/10/1992
• Status: Expired due to Fees

• Current Assignee: Power Monitors, Inc.
• Original Assignee: Shenandoah Electronic Intelligence Incorporated (Serco Group PLC)
• Inventors: Shomo, Glen K. III, Curt, Walter M.
• Primary Examiner(s): WACHSMAN, HAL D
• Application Number:
  US09/002,392
• Time in Patent Office: 1,537 Days
• Field of Search: 702/57, 702/60-62, 702/65-68, 702/79, 702/80, 702/120, 702/122, 702/117, 702/124-126, 702/180, 702/183, 702/184, 702/187, 702/188, 702/189, 702/193, 702/198, 702/FOR.111, 702/FOR.170, 702/FOR.171, 702/FOR.103, 702/FOR.105, 702/FOR.106, 702/FOR.110, 705/412, 324/990, 324/100, 324/103.R, 324/141, 324/142, 324/76.15, 324/73.1, 324/76.42, 324/113, 324/116, 324/157, 340/870.02, 340/16, 340/21, 340/657, 340/660-663, 346/150.1, 363/143, 700/73, 700/74, 700/286, 700/291-298, 341/155, 341/122, 341/126, 361/78, 361/79, 361/86, 361/88, 361/89, 361/90, 361/91.1, 323/237
• US Class Current: 702/64
• CPC Class Codes: G01R 31/42 AC power supplies

Abstract

A portable unit, preferably adapted for plugging into a common wall outlet, has circuitry for monitoring the voltage and/or current provided through an electrical outlet. In addition to the monitoring circuitry, the unit preferably includes a microprocessor for digitally processing the power waveform as well as analytical quantities related to the waveform. Further, the unit preferably has a storage area for storing samples of the input waveform as well as a log of related analytical quantities for downloading to a computer, local area network, or other destination, for collection and analysis. Preferably, the unit is provided with a local visual display and an alarm indicator.

Claims

1. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network,

wherein the preset time intervals include a one second interval and a one minute interval, and wherein the averaging means determines

a one second average root mean square voltage value of voltage provided by the power portion, and

a one minute average root mean square voltage value of voltage provided by the power portion.

2. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network,

wherein voltage provided by the power portion is an alternating current voltage and one of the preset time intervals is one cycle of the alternating current voltage,

wherein the averaging means determines a one cycle average root mean square voltage value of voltage provided by the power portion, and

wherein the controller portion further includes recording means for recording a maximum one cycle average root mean square voltage value for each of one or more of the preset time intervals occurring during the recording period.

3. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network,

wherein voltage provided by the power portion is an alternating current voltage and one of the preset time intervals is one cycle of the alternating current voltage,

wherein the averaging means determines a one cycle average root mean square voltage value of voltage provided by the power portion, and

wherein the controller portion further includes recording means for recording a minimum one cycle average root mean square voltage value for each of one or more of the preset time intervals occurring during the recording period.

4. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network, wherein

the recording period is longer than twenty-four hours;

one of the preset time intervals is a first time interval, wherein the averaging means determines an average root mean square voltage value for each first time interval occurring in each twenty-four hour period of the recording period; and

the controller portion further includes a second averaging means for averaging corresponding first time interval average root mean square voltage values for each twenty-four hour period of the recording period.

5. A voltage monitoring and recording device according to claim 4, wherein the first time interval is a fifteen minute interval.

6. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network, wherein

one of the preset time intervals is a first time interval, wherein the averaging means determines an average root mean square voltage value for each first time interval occurring during the recording period; and

the controller portion further includes rounding means for rounding each first time interval average root mean square voltage value determined by the averaging means to an integral voltage value within a preset voltage value range.

7. A voltage monitoring and recording device according to claim 6, wherein the controller portion further includes recording means for recording, for each integral voltage value within the preset voltage value range, the number of rounded first time interval average root mean square voltage values equal to each integral voltage value occurring during the recording period.

8. A voltage monitoring and recording device according to claim 7, wherein the first time interval is a one minute interval.

9. A voltage monitoring and recording device according to claim 6, wherein the first time interval is a one minute interval.

10. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network, wherein the controller portion further includes a flicker determining means for determining when an average root mean square voltage value varies from a previous average root mean square voltage value by a threshold amount and at a frequency exceeding a preset flicker rate.

11. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network,

wherein the controller portion includes first abnormal voltage determining means for determining when an average root mean square voltage value of voltage provided by the power portion exceeds a first preset voltage value range for a preset trigger period, and the controller portion further includes second abnormal voltage determining means for determining when a root mean square voltage value of voltage provided by the power portion exceeds a second preset voltage value range for the preset trigger period.

12. A voltage monitoring and recording device according to claim 11, wherein the second preset voltage value range is variable.

13. A voltage monitoring and recording device according to claim 11, wherein the controller portion records the time and date when the average root mean square voltage value of voltage provided by the power portion exceeds the second preset voltage value range for the preset trigger period.

14. A voltage monitoring and recording device according to claim 11, further including a display portion for indicating when the average root mean square voltage value exceeds the second preset voltage value range for the preset trigger period.

15. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network, wherein

the plurality of preset time intervals includes a first time interval and a second time interval greater than the first time interval, and

the controller portion further includes recording means for recording a maximum first time interval average root mean square voltage value for each second time interval occurring during the recording period.

16. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including averaging means for determining an average root mean square voltage value of voltages provided by the power portion for each of a plurality of preset time intervals occurring during a recording period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network, wherein

the plurality of preset time intervals includes a first time interval and a second time interval greater than the first time interval, and

the controller portion further includes recording means for recording a minimum first time interval average root mean square voltage value for each second time interval occurring during the recording period.

17. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion further including

averaging means for determining an average root mean square voltage value of voltage provided by the power portion, and

significant change determining means for determining when an average root mean square voltage value varies from a previous average RMS voltage value by a threshold amount; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network,

wherein the controller portion further includes a flicker determining means for determining when an average root mean square voltage value varies from a previous average root mean square voltage value by a second threshold amount and at a frequency exceeding a preset flicker rate.

18. A voltage monitoring and recording device according to claim 17, wherein the controller portion further includes memory means for storing a time at which the average root mean square voltage value varies from the previous average root mean square voltage value by the threshold amount.

19. A voltage monitoring and recording device, comprising:

a power portion for receiving voltage from an external power supply and providing a voltage proportional to the received voltage;

a controller portion for monitoring and recording voltage information for voltage provided by the power portion, the controller portion including

averaging means for determining an average root mean square voltage value of voltage provided by the power portion, and

first abnormal voltage determining means for determining when an average root mean square voltage value of voltage provided by the power portion exceeds a first preset voltage value range for a preset trigger period; and

a communication portion, for receiving operation instruction from an external communications network, and for communicating recorded voltage information to the external communications network,

wherein the controller portion further includes second abnormal voltage determining means for determining when a root mean square voltage value of voltage provided by the power portion exceeds a second preset voltage value range for a second preset trigger period.

20. A voltage monitoring and recording device according to claim 19, wherein the second preset voltage value range is variable.

21. A voltage monitoring and recording device according to claim 19, wherein the controller portion records the time and date when an average root mean square voltage value of voltage provided by the power portion exceeds the second preset voltage value range for the second preset trigger period.

22. A voltage monitoring and recording device according to claim 19, further comprising a display portion, wherein the display portion indicates when an average root mean square voltage value exceeds the second preset voltage value range for the second preset trigger period.