# US 2019/0377010 A1 · Current measurement device

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- Number: US 2019/0377010 A1
- Document ID: US20190377010A1
- Status: Published application
- Kind: A1
- Application number: 16/488,400
- Filed: 2017-10-05
- Published: 2019-12-12
- Earliest claimed: 2017-03-06
- Assignees: Cvengineering Corporation
- Applicants: Cvengineering Corporation
- Inventors: Yoichi YANAGISAWA
- Web page: https://patentgrep.com/patent/US20190377010A1

## CPC

- G01R 19/16504: {characterised by the components employed}
- G01R 1/22: Tong testers acting as secondary windings of current transformers
- G01R 15/20: using galvano-magnetic devices, e.g. Hall-effect devices {, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices}
- G01R 15/207: {Constructional details independent of the type of device used}
- G01R 19/0092: {Measuring current only}
- G01R 33/07: Hall effect devices
- G01R 33/072: {Constructional adaptation of the sensor to specific applications}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A pair of clamping parts clamp a conductor to be measured and biased in closing directions. A pair of gripping parts are provided to be able to change a distance between the respective clamping parts according to a distance therebetween. Magnetoelectric conversion element(s) for current measurement is/are provided on either one or both of the respective clamping parts. A distance measurement unit is provided to be able to measure a physical quantity corresponding to the distance between the respective gripping parts as a physical quantity corresponding to the distance between the respective clamping parts. A current calculation device is provided to obtain a current flowing in the conductor to be measured on the basis of a magnetic field detected by the magnetoelectric conversion element(s) for current measurement and the physical quantity measured by the distance measurement unit when the conductor to be measured is clamped by the respective clamping parts.

## Claims

### Claim 1

A current measurement device, comprising:
a pair of clamping parts provided to clamp a conductor to be measured;
magnetoelectric conversion element(s) for current measurement provided on either one or both of the respective clamping parts;
a distance measurement unit provided to be able to measure a physical quantity corresponding to a distance between the respective clamping parts; and
a current calculation means provided to obtain a current flowing in the conductor to be measured on the basis of a magnetic field detected by the magnetoelectric conversion element(s) for current measurement and the physical quantity measured by the distance measurement unit when the conductor to be measured is clamped by the respective clamping parts.

### Claim 2 (depends on 1)

The current measurement device according to claim 1, comprising a pair of gripping parts provided to be able to change the distance between the respective clamping parts according to a distance therebetween, wherein:
the respective clamping parts are biased in closing directions; and
the distance measurement unit is provided to be able to measure a physical quantity corresponding to the distance between the respective gripping parts as the physical quantity.

### Claim 3 (depends on 2)

The current measurement device according to claim 2, wherein the distance measurement unit includes a magnet provided on one gripping part and a magnetoelectric conversion element for distance measurement provided on the other gripping part to be able to detect a magnetic field due to the magnet.

### Claim 4 (depends on 1)

The current measurement device according to claim 1, wherein the current calculation means is configured to obtain the current flowing in the conductor to be measured by correcting a current value obtained on the basis of the magnetic field detected by the magnetoelectric conversion element(s) for current measurement by a correction value obtained on the basis of the physical quantity measured by the distance measurement unit.

### Claim 5 (depends on 2)

The current measurement device according to claim 2, wherein the current calculation means is configured to obtain the current flowing in the conductor to be measured by correcting a current value obtained on the basis of the magnetic field detected by the magnetoelectric conversion element(s) for current measurement by a correction value obtained on the basis of the physical quantity measured by the distance measurement unit.

### Claim 6 (depends on 3)

The current measurement device according to claim 3, wherein the current calculation means is configured to obtain the current flowing in the conductor to be measured by correcting a current value obtained on the basis of the magnetic field detected by the magnetoelectric conversion element(s) for current measurement by a correction value obtained on the basis of the physical quantity measured by the distance measurement unit.