JPS58169903A - Current transformer - Google Patents

Abstract

PURPOSE:To reduce the diameter of a magnetic substance and its weight by a construction wherein ring magnetic substance is provided close to the periphery of a high tension conductor and a magnetic optical effective element is arranged in the gap made in the magnetic substance. CONSTITUTION:A magnetic substance 2 made of a ring-shaped silicon steel sheet, permalloy or the like is arranged in contact with the periphery of a high tension conductor 1 contained in an airtight container. A magnetic optical effective element 3 is provided in the gap made in the magnetic substance 2. Subsequently there are provided a cable guide 42 comprising an optical cable 4, an optical connector 41 and an insulator composed of teflon, and so on for supplying light to the magnetic optical effective element and leading polarized light out of the airtight container. In so doing, because the ring magnetic substance 2 is provided close to the high tension conductor, it is possible to reduce its diameter and weight.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current transformation device using a magneto-optic effect element.

As is well known, this Keyaki current transformation device using a magneto-optic effect element, such as a Faraday element, has been proposed.

For example, to measure the current of a high-voltage conductor placed in a sealed container filled with an insulating medium such as 8FA gas, a ring-shaped magnetic material is placed close to the inner wall of the sealed container and surrounding the high-voltage conductor. A Faraday element is placed in the gap provided in the magnetic body to apply a magnetic field to the magnetic body, an optical cable drawn from outside the sealed container is connected to the Faraday element, and a polarizer is connected to the Faraday element. Using the principle that the polarization angle of the Faraday element changes in proportion to the strength of the magnetic field, the current flowing through the conductor changes the polarization angle of the light to a smaller value, and then the analyzer The optical cable is then sealed by changing the strength of the light through the
A structure has been proposed in which the signal is guided outside the 2G device and converted into an electrical signal by an optical-to-electrical converter within an electric station, for example.

However, according to the above-mentioned configuration, the magnetic material is disposed close to the inside of the sealed container and surrounding the high voltage conductor, so its diameter becomes large, and furthermore, considerations for insulation are not taken into consideration. This has the disadvantage of complicating the support structure for the magnetic material and the Faraday element.

In view of the above-mentioned problems, the present invention is such that a ring-shaped magnetic body and a magneto-optical effect element are disposed close to the outer periphery of a high-voltage conductor.

An embodiment of the present invention will be explained below based on FIGS. 1 and 2. Reference numeral 1 denotes a high-voltage conductor housed in an airtight container (not shown) filled with an insulating medium of HFbF2 gas;
In order to measure the current flowing through the high-voltage conductor 1, in the illustrated example, a ring-shaped magnetic body 2 made of a silicon steel plate, permalloy, or the like is disposed in contact with the outer periphery of the high-voltage conductor 1. 6
is arranged in a gap provided in the magnetic column body 2, and the magneto-optical effect, such as a Faraday element, whose unidirectional angle changes in proportion to the strength of the magnetic field induced in the magnetic body 2. It is element. 4 is the magneto-optic effect element 6
41 is an optical connector for supplying light to and for leading the light out of the sealed container.
, 42 are cable guides made of an insulating material such as Teflon, which are provided as necessary to guide the optical cable 4. 5 is an analyzer, 6 is a photon.
The analyzers 5 and 6 are removed from the closed container as necessary.
It is of course possible to do so. Reference numeral 7 denotes a shield for mitigating the electric field, which is provided as necessary. It can be made of aluminum, for example, and when a three-phase high-voltage conductor is housed in a sealed container, it can prevent the magnetic influence of other phases. Of course, it may also be made of a magnetic material and serve as a magnetic shield in order to further reduce -.

According to the above configuration, since the ring-shaped magnetic body 2 is close to the high-voltage conductor 1, its diameter can be made extremely small, and the magnetic field from the high-voltage conductor 1 is efficiently induced in the magnetic body, improving measurement accuracy. I hope for improvement.

Further, the high voltage conductor 2 can also serve as a support structure for the magnetic body 2.

Next, other embodiments of the present invention will be explained based on FIGS. 6 to 5 showing other embodiments. In addition, parts given the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts. In the example shown in the figure, in addition to achieving the same effect as the above-described embodiment, the connection between the magneto-optic effect cable 6 and the optical cable 4 is performed outside the high-voltage conductor 1, so that the drilling of the high-voltage conductor 1 is easy. or,
In history, this was designed to omit the work of connecting the optical cable 4, etc. In the illustrated example, the optical cable 4 is connected to a high voltage with respect to the magneto-optic effect cable 6 disposed within the gap of the ring-shaped magnetic body 2. The conductor 1 is configured to be connected from the axial direction.

As described in detail above, according to the present invention, the magnetic material can reduce the diameter and weight with a simple configuration, and the configuration inside the closed container can be simplified.

The present invention also provides a three-phase coil current transformer in which three-phase high-voltage conductors are all housed in a sealed container.

In this case, since the high-voltage conductor to be measured and the tIA magnetic body are close to each other, the influence from the high-voltage conductors of other phases is reduced, and it is possible to achieve -accuracy.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the present invention.
The figure is a sectional view taken along the +E plane, and FIG. 2 is a sectional view taken along the line A-A' in FIG. 6 to 5 show other embodiments of the present invention, FIG. 6 is a front sectional view, FIG. 4 is a front view taken along line BB' in FIG. 6, and FIG. 5 is a diagram in FIG. 6. It is a CC' blood cut diagram of. 1: High voltage conductor, 2: Magnetic material, 6: G & magneto-optical effect element patent applicant Dai 2 Figure

Claims (1)

[Claims] A current transformation device characterized in that a ring-shaped magnetic material is disposed close to the outer periphery of a high-voltage conductor housed in a sealed container, and a magneto-optic effect element is disposed within a gap provided in the magnetic material. Device.