Non-contact voltage measurement with adjustable size rogowski coil

Patent metadata

Field	Value
Publication number	US-2023251289-A1
Application number	US-202318303397-A
Country	US
Kind code	A1
Filing date	Apr 19, 2023
Priority date	Feb 5, 2020
Publication date	Aug 10, 2023
Grant date	—

Abstract

A sensor probe includes a body having first and second channels that are spaced apart and extend through the body approximately parallel to each other. A first end of a Rogowski coil is fixed within the first channel. The Rogowski coil passes through the second channel and loops back to the first channel where a second end of the Rogowski coil is selectively insertable into the first channel opposite the first end of the Rogowski coil. A non-contact sensor coupled to the body is positioned between the first and second channels to measure a parameter of an insulated conductor situated within the loop formed by the Rogowski coil. The size of an interior region within the loop is selectively adjustable by sliding movement of the Rogowski coil within the second channel.

First claim

1 . A sensor probe, comprising:
a body including:
a first channel;
a second channel that is approximately parallel to the first channel; and
a non-contact sensor that is operative to sense at least one electrical parameter in a conductor without requiring galvanic contact with the conductor; and
a Rogowski coil that is slidably positioned in the first and second channels of the body and forms a loop, wherein a size of the loop is adjustable by sliding a portion of the Rogowski coil relative to the body in at least one of the first channel or the second channel; and wherein the non-contact sensor and the Rogowski coil are operative to sense an electrical parameter in the conductor when the conductor is within the loop of the Rogowski coil and positioned proximate to the non-contact sensor.

2 . The sensor probe of claim 1 , wherein the size of the loop is reduced by sliding the Rogowski coil in at least one of the first channel or the second channel, to retain the conductor proximate to the non-contact sensor.

3 . The sensor probe of claim 1 , wherein the Rogowski coil has a first end and a second end, and the first end of the Rogowski coil is fixed within the first channel of the body.

4 . The sensor probe of claim 3 , wherein the second end of the Rogowski coil is removably insertable into the first channel, and when the second end is removed from the first channel, a gap is formed which allows the conductor to pass and be positioned within the loop.

5 . The sensor probe of claim 4 , wherein the first channel of the body includes a fastener that is operative to releasably secure the second end of the Rogowski coil within the first channel when the second end of the Rogowski coil is inserted into the first channel.

6 . The sensor probe of claim 4 , wherein sidewalls of the first channel releasably secure the second end of the Rogowski coil within the first channel by an interference fit when the second end of the Rogowski coil is inserted into the first channel.

7 . The sensor probe of claim 4 , further comprising a locking mechanism that is operative in an open position to allow the Rogowski coil to slide within the first and/or second channel, and in a closed position to releasably secure the Rogowski coil to prevent sliding movement of the Rogowski coil.

8 . The sensor probe of claim 1 , further comprising a second non-contact sensor coupled to the Rogowski coil, wherein the second non-contact sensor is operative to sense an electrical parameter in the conductor when the conductor is within the loop of the Rogowski coil.

9 . The sensor probe of claim 1 , wherein the body is shaped with a concave saddle opposite to the loop of the Rogowski coil, and the non-contact sensor is coupled to the body within the concave saddle.

10 . The sensor probe of claim 1 , further comprising an interface connector electrically coupled to the non-contact sensor and the Rogowski coil to convey a sensed electrical parameter to a measuring device.

11 . The sensor probe of claim 1 , wherein the non-contact sensor comprises at least one of a non-contact voltage sensor, a non-contact current sensor, a Hall Effect sensor, a fluxgate sensor, an anisotropic magnetoresistance (AMR) sensor, or a giant magnetoresistance (GMR) sensor.

12 . The sensor probe of claim 1 , wherein the body further includes an interior cavity that encompasses a portion of the Rogowski coil outside of the first and second channels.

13 . The sensor probe of claim 1 , further comprising control circuitry in communication with the non-contact sensor and the Rogowski coil, wherein the control circuitry is configured to receive a signal from at least one of the non-contact sensor or the Rogowski coil and process the signal to sense the at least one electrical parameter in the conductor.

14 . A sensor probe, comprising:
a body including a first channel, a second channel, and a non-contact sensor that is operative to sense at least one electrical parameter in a conductor without requiring galvanic contact with the conductor; and a Rogowski coil having a first end and a second end, wherein the first end is fixed within the first channel and the second end of the Rogowski coil is removably insertable into the first channel, wherein the Rogowski coil is slidable within the first channel and/or the second channel of the body, wherein the Rogowski coil forms a loop of adjustable size relative to the body when the second end of the Rogowski coil is inserted into the first channel, and wherein the non-contact sensor and the Rogowski coil are operative to sense an electrical parameter in the conductor when the conductor is within the loop of the Rogowski coil and positioned proximate to the non-contact sensor.

15 . The sensor probe of claim 14 , wherein a size of the loop is adjustable by sliding movement of the Rogowski coil in at least the second channel of the body.

16 . The sensor probe of claim 14 , wherein a gap formed by removal of the second end of the Rogowski coil from the first channel allows the conductor to pass into the loop and be positioned proximate to the non-contact sensor.

17 . The sensor probe of claim 14 , wherein sliding movement of the Rogowski coil reduces a size of the loop to retain the conductor is a position proximate to the non-contact sensor.

18 . The sensor probe of claim 14 , further comprising a fastener in the first channel of the body that releasably secures the second end of the Rogowski coil within the first channel when the second end of the Rogowski coil is inserted into the first channel.

19 . The sensor probe of claim 14 , wherein the second end of the Rogowski coil is releasably secured within the first channel by an interference fit when the second end of the Rogowski coil is inserted into the first channel.

20 . The sensor probe of claim 14 , further comprising a locking mechanism configured to selectively allow the Rogowski coil to slide within the first channel and/or the second channel and secure the Rogowski coil to prevent sliding movement of the Rogowski coil.

Assignees

• Fluke Corp

Inventors

• Woo Ginger M
• Chun Gloria M
• Rodriguez Ricardo
• Steuer Ronald

Classifications

• G01R15/181 Primary

  using coils without a magnetic core, e.g. Rogowski coils · CPC title

• H04Q9/00

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title

• G01R15/12 Primary

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

• G01R15/142 Primary

  Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26 · CPC title

• G01R19/155

  Indicating the presence of voltage · CPC title