JPH0228103B2 - DENRYUSOKUTEISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical measuring device capable of measuring a current flowing through a conductor within a container.

As shown in FIGS. 1 and 2, a conventional electric device includes magnetic sensors 11, 1 for detecting current in each phase.
Since the magnetic sensors 11, 12, 13 are arranged inside each container 1, 2, 3, it is difficult to install and maintain the magnetic sensors 11, 12, 13.

This invention was made to solve the above-mentioned drawbacks, and a container is constructed by connecting first and second cylinders made of conductive members in series via an insulating member in the axial direction, and the container is surrounded by a container. By electrically connecting each end of the magnetic shield to each cylinder and placing a magnetic sensor between the magnetic shield and the container,
Provided is a current measuring device that allows easy installation and removal of a magnetic sensor and maintenance work.

The figures will be explained below. In FIGS. 3 and 4, 1, 2, and 3 are containers arranged approximately in parallel, and first cylinders 1a, 2a,
3a and second cylindrical bodies 1b, 2b, 3b are connected in series via insulating members 1c, 2c, 3c. 1d, 2d, and 3d are the respective first cylindrical bodies 1a,
Flanges provided on 2a, 3a, 1e, 2e,
3e is a flange provided on each of the second cylindrical bodies 1b, 2b, 3b; 4, 5, and 6 are electrical conductors disposed through each of the containers 1, 2, and 3; and 7a, 7b are the containers 1. , 2 and 3 are electrically connected between one end side and the other end side thereof, respectively. By providing the short circuit members 7a and 7b, the containers 1,
An induced current flows in the conductors 2 and 3 in the opposite direction to the current flowing through the conductors 4, 5, and 6, and leakage magnetic flux to the outside of each container 1, 2, and 3 is reduced. Reference numerals 8, 9, and 10 denote circular magnetic shields made of a conductive material or a magnetic material, which are coaxial with the containers 1, 2, and 3, and surround the containers 1, 2, and 3. The magnetic shields 8, 9, 10 have one end electrically connected to the flanges 1d, 2d, 3d, and the other end electrically connected to the flanges 1e, 2e, 3e. Further, each magnetic shield 8, 9, 10 is divided on a straight line connecting each conductor 4, 5, 6 to facilitate assembly work. 11, 12, 13
is a magnetic sensor composed of a search coil, a Hall element, a magneto-optical element, etc., and is attached to flanges 1d,
The first containers 1a, 2a, 3a and the magnetic shield 8, which are closer to the insulating members 1c, 2c, 3c than 2d, 3d.
It is located between 9 and 10.

The induced current circulating through the short-circuiting member 7 flows through the second cylindrical bodies 1b, 2b, 3b - the flanges 1e, 2e, 3.
e-magnetic shield 8, 9, 10-flange 1d,
2d, 3d - Flows from the flanges 1d, 2d, 3d to the first cylinders 1a, 2a, 3a on the shorting member 7a side. Therefore, the first cylindrical body 1a, between the flanges 1d, 2d, 3d and the insulating members 1c, 2c, 3c,
2a, 3a, that is, magnetic sensors 11, 12,
No induced current flows through the short-circuiting members 7a, 7b to the first cylindrical bodies 1a, 2a, 3a located inside the cylinder 13. As a result, the magnetic sensor 11,1
The influence of induced current on 2 and 13 is extremely small.

Moreover, the magnetic shields 8, 9, 10 are the containers 1,
2 and 3, so the magnetic field due to the current of the conductors 4, 5, and 6 of the own phase is applied to the magnetic sensor 1.
It is easy to pass through 1, 12, and 13.

In addition, as shown in FIG. 5, the first cylinders 1a, 2
Cylindrical insulators 1f, 2 are installed between the flanges 1d, 2d, 3d of a, 3a and the flanges 1e, 2e, 3e.
It is also effective to configure it with f and 3f.

As described above, according to the present invention, a container is constructed by connecting the first and second cylindrical bodies made of a conductive member in series via an insulating member, and a plurality of containers are arranged approximately parallel to each other. A conductor was passed through the container, each end of the magnetic shield surrounding the container was electrically connected to each cylinder, and the magnetic sensor was placed between the magnetic shield and the container, so it was easy to install and remove the magnetic sensor. This makes maintenance work easier.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional current measuring device, FIG. 2 is a sectional view of FIG. 1, FIG. 3 is a perspective view of an embodiment of the present invention, and FIG. 4 is a sectional view of FIG. FIG. 5 is a sectional view of another embodiment of the invention. In the figure, 1,
2 and 3 are containers, 1a, 2a, and 3a are first cylinders,
1b, 2b, 3b are second cylindrical bodies, 1c, 2c, 3
c is an insulating member, 4, 5, 6 are conductors, 8, 9, 10
is a magnetic shield, and 11, 12, and 13 are magnetic sensors. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1 A container is constructed by connecting first and second cylindrical bodies made of a conductive member in series via an insulating member in the axial direction, and a plurality of the containers are arranged approximately in parallel, and each container is energized. A conductor is passed through the container, electrically connecting one end of each of the containers and one end of the container, and each end of a magnetic shield surrounding the container is electrically connected to each of the cylindrical bodies. A current measuring device characterized in that a magnetic sensor for detecting the current in the conductor is disposed between the magnetic shield and the container.