Multiple phase measurement device

Patent metadata

Field	Value
Publication number	US-10534026-B2
Application number	US-201715697237-A
Country	US
Kind code	B2
Filing date	Sep 6, 2017
Priority date	Sep 6, 2017
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

Systems and methods that measure electrical parameters of a multi-phase electrical system may utilize a multi-phase measurement device that includes a sensor subsystem that has a voltage sensor and a current sensor. Each of the voltage sensor and the current sensor may be a contact-type sensor or a “non-contact” sensor that does not require galvanic contact. In operation, a multi-phase measurement device may utilize the voltage sensor and the current sensor to sequentially obtain single phase measurements for each phase of a multi-phase electrical system. The measurements may be synchronized to obtain various multi-phase power parameters, such as various parameters relating to power, phase, voltage, current, etc. The multi-phase measurement device may be operative to automatically detect when an operator has positioned a sensor of the sensor subsystem proximate a conductor under test so the multi-phase measurement device can initiate detection of one or more electrical parameters in the conductor.

First claim

The invention claimed is:

1. A multi-phase measurement device, comprising:
a sensor subsystem that, in operation, senses at least one of voltage or current in a conductor;
a user interface;
control circuitry communicatively coupled to the sensor subsystem, wherein in operation, the control circuitry:
causes the user interface to direct a user of the multi-phase measurement device to position a sensor of the sensor subsystem proximate a first conductor of a multi-phase electrical system;
receives, via the sensor subsystem, first conductor electrical parameter data associated with a signal present in the first conductor, the first conductor electrical parameter data comprising at least one of voltage data or current data;
processes the received first conductor electrical parameter data to determine a frequency of the signal in the first conductor;
establishes synchronization data based at least in part on the determined frequency of the signal in the first conductor;
causes the user interface to direct the user to position a sensor of the sensor subsystem proximate a second conductor of the multi-phase electrical system;
receives, via the sensor subsystem, second conductor electrical parameter data associated with a signal present in the second conductor, the second conductor electrical parameter data comprising at least one of voltage data or current data;
processes the received second conductor electrical parameter data to determine phase information for the signal in the second conductor relative to phase information for the signal in the first conductor based at least in part on the established synchronization data;
causes the user interface to direct the user to position a sensor of the sensor subsystem proximate a third conductor of the multi-phase electrical system;
receives, via the sensor subsystem, third conductor electrical parameter data associated with a signal present in the third conductor, the third conductor electrical parameter data comprising at least one of voltage data or current data; and
processes the received third conductor electrical parameter data to determine phase information for the signal in the third conductor relative to phase information for the signal in at least one of the first conductor or the second conductor based at least in part on the established synchronization data,

wherein prior to the reception of each of the first conductor electrical parameter data, second conductor electrical parameter data, and third conductor electrical parameter data, the control circuitry receives measurement data from the sensor subsystem indicative of whether the sensor of the sensor subsystem is positioned proximate the first conductor, second conductor, and third conductor, respectively, and wherein the sensor subsystem generates a reference current, and the measurement data comprises a characteristic of the reference current detected in the first conductor, second conductor, or third conductor.

2. The multi-phase measurement device of claim 1 wherein the synchronization data comprises a fixed repeating interval that has a duration that is equal to a period of the signal in the first conductor.

3. The multi-phase measurement device of claim 1 wherein the sensor subsystem comprises at least a current sensor and a voltage sensor.

4. The multi-phase measurement device of claim 1 wherein the sensor subsystem comprises at least one of a non-contact voltage sensor or a non-contact current sensor.

5. The multi-phase measurement device of claim 1 wherein, in operation, the control circuitry:
processes the first conductor electrical parameter data, second conductor electrical parameter data, and third conductor electrical parameter data to determine at least one additional electrical parameter of the multi-phase electrical system.

6. The multi-phase measurement device of claim 5 wherein the at least one additional electrical parameter comprises at least one of a voltage parameter, a current parameter, a power parameter, a phase sequence parameter, a voltage phase shift parameter, a current phase shift parameter, a voltage/current phase shift parameter, a harmonics parameter, or a waveform parameter.

7. The multi-phase measurement device of claim 1 wherein, in operation, the control circuitry:
causes the user interface to present an indication of the determined phase information on a display of the user interface.

8. The multi-phase measurement device of claim 7 wherein the indication of the determined phase information comprises a phasor diagram presented on the display of the user interface.

9. The multi-phase measurement device of claim 1 wherein, in operation, the control circuitry processes the received first conductor electrical parameter data utilizing a Fast Fourier Transform (FFT) to determine a frequency of the signal in the first conductor.

10. A multi-phase measurement device, comprising:
a sensor subsystem that, in operation, senses at least one of voltage or current in a conductor;
a user interface;
control circuitry communicatively coupled to the sensor subsystem, wherein in operation, the control circuitry:
causes the user interface to direct a user of the multi-phase measurement device to position a sensor of the sensor subsystem proximate a first conductor of a multi-phase electrical system;
receives, via the sensor subsystem, first conductor electrical parameter data associated with a signal present in the first conductor, the first conductor electrical parameter data comprising at least one of voltage data or current data:
processes the received first conductor electrical parameter data to determine a frequency of the signal in the first conductor;
establishes synchronization data based at least in part on the determined frequency of the signal in the first conductor;
causes the user interface to direct the user to position a sensor of the sensor subsystem proximate a second conductor of the multi-phase electrical system;
receives, via the sensor subsystem, second conductor electrical parameter data associated with a signal present in the second conductor, the second conductor electrical parameter data comprising at least one of voltage data or current data:
processes the received second conductor electrical parameter data to determine phase information for the signal in the second conductor relative to phase information for the signal in the first conductor based at least in part on the established synchronization data;
causes the user interface to direct the user to position a sensor of the sensor subsystem proximate a third conductor of the multi-phase electrical system;
receives, via the sensor subsystem, third conductor electrical parameter data associated with a signal present in the third conductor, the third conductor electrical parameter data comprising at least one of voltage data or current data: and
processes the received third conductor electrical parameter data to determine phase information for the signal in the third conductor relative to phase information for the signal in at least one of the first conductor or the second conductor based at least in part on the established synchronization data,

wherein prior to the reception of each of the first conductor electrical parameter data, second conductor electrical parameter data, and third conductor electrical parameter data, the control circuitry receives measurement data from the sensor subsystem indicative of whether the sensor of the sensor subsystem is positioned proximate the first conductor, second conductor, and third conductor, respectively, and wherein, responsive to receipt of measurement data indicative that the sensor of the sensor subsystem is not positioned proximate one

Assignees

• Fluke Corp

Inventors

• Steuer Ronald
• Radda Peter

Classifications

• G01R23/02

  Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage · CPC title

• G08C17/02

  using a radio link · CPC title

• G01R15/12

  Circuits for multi-testers {, i.e. multimeters}, e.g. for measuring voltage, current, or impedance at will · CPC title

• G01R21/06

  by measuring current and voltage (G01R21/08 - G01R21/133 take precedence) · CPC title

• G01R25/005 Primary

  Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal · CPC title