JPS6273166A - Light applied current detector - Google Patents

Abstract

PURPOSE:To obtain a light applied current detector in which an optical sensor having extremely high sensitivity as compared with the one using a core is incorporated, by lowering the position of an electric wire to the intermediate position in the up-and-down directions of an insulator along a groove part and assembling a magnetic core so as to surround said electric wire. CONSTITUTION:An insulator 1 has an internal cavity 3 and a projection 4 is formed in said insulator 1 by a grooved part 2. A magnetic core 5 is formed as a core having two gap parts (a), (b). An optical magnetic field sensor 6 is arranged to the gap part (a) and connected to an optical fiber cord 7. The gap width of the other gap part (b) almost just coincide with the outer width of the projection 4 when the optical magnetic field sensor 6 is integrally connected in the state arranged to the gap part (a) and both ends of the gap part (b) is externally fitted to the projection 4. The core 5 is fixed to the projection 4 or a cavity wall surface in this state. The depth of the groove part 2 is determined in relative relation to the size of the core 5. A bottom lid 9 is equipped with a mount pin 10 and an optical fiber cable 11 is pierced through said lid 9 and an earth terminal 12 is fixed to the lid 9 to hermetically close the cavity 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an optical current detector incorporating an optical magnetic field sensor into an insulator.

[Background Art and Problems] First, we proposed a device that measures a total of 6111 currents by inserting an optical magnetic field sensor into a bottle insulator. The device is compact and improves system reliability (31'al
l+, which is very useful.

By the way, the magnetic field around the current-carrying part is inversely proportional to the distance from the center of the current-carrying part, but in the above device, the distance from the center of the current-carrying part to the center of the magnetic field sensor is at least 20 square meters or more, and the measured magnetic field is small, so the detection sensitivity is low. is low.

Furthermore, since the optical magnetic field sensor is sensitive to the magnetic field in the direction of the optical path, it may be influenced by other phase magnetic fields and introduce errors.

Furthermore, although the measured value changes depending on the positional relationship between the electric wire and the optical magnetic field sensor, there is a problem in that measurement accuracy is low due to the influence of fluctuations in the electric wire.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and the insulator has a groove in the upper part and is hollow inside. A magnetic core having a cavity is disposed, an optical magnetic field sensor is disposed in one of the cavities, the other cavity is disposed in the hollow protrusion, and an electric wire is sandwiched in the groove and positioned inside the core. It is characterized by this.

The present invention will be explained below with reference to an embodiment shown in FIG.

In the figure, 1 is an insulator, and 2 is -1- below the top surface.
+i formed across the wire for holding the electric wire is the part. The interior of the insulator 1 is a cavity 3, and a protrusion 4 protrudes into the interior through the groove 2.

5 is a magnetic core, which is formed as a core having two air gaps 49. An optical magnetic field sensor 6 is placed in one of the gaps ^. The optical magnetic field sensor 6 is connected to an optical fiber cord 7.

Various choices can be made regarding the connection between the core 5 and the portion housing the optical magnetic field sensor 6. For example, the end portion of the core 5 and the portion housing the optical magnetic field sensor 6 may be wrapped and bound with a non-magnetic material, or may be integrally molded as the case may be. The gap width of the other gap 6 in the core 5 is exactly the same as that of the protrusion 4 when the optical magnetic field sensor 6 is disposed in the gap 4 as described in 1-1 and is coupled together.
y+
tJ is fitted to the outside of the protrusion 4. The core 5 is fixed to the protrusion 4 or the cavity wall using an adhesive or the like in this lowered position. J The depth of the groove 2 is determined relative to the thickness of the core 5, but when the core 5 is fixed, the electric wire 8 inserted into the groove 2 is just inside the core 5. Make it deep enough to be in the center.

The optical magnetic field center 6 is a Faraday effect element, such as a BSO (
B i+2s i 020), BGO(B 11z
Geo2o), lead glass, Zn5e, magnetic thin film (YI
G magnetic garnet), (TBY) IG, which is equipped with a polarizer, an analyzer, etc., and an optical fiber input/output line is created, and the detection is performed by Faraday rotation of the plane of polarization by the magnetic field. The current value is measured based on changes in the amount of light output from photons.

The Faraday element of the optical magnetic field sensor eliminates the Pockels effect.
If the element is a device that uses a conductive layer, connect a ground wire to the ground terminal of the core and the optical magnetic field sensor, but it is necessary to ground the other end of the tensile/con member and electrostatically shield the optical magnetic field sensor with a conductive layer. There is.

In addition, the core material f4 includes steel materials such as pure iron, carbon steel, alloy steel, and silicon steel, powdered iron cores such as permalloy, sendust alloy, molybutton/permalloy, and sintered soft 1 of ferrite Kotobuki.
If material is used.

In the figure, 9 is a bottom cover that closes the cavity 3, the bottom cover 9 is provided with a bin 10 for attachment, an optical fiber cable 11 is passed through 11, a ground terminal 12 is fixed, and the cavity 3 is sealed. The optical fiber cord 7 pulled out from the optical fiber cable 1 is connected to the optical magnetic field sensor 6 for optical input/output as described above, and the tenonoyo/member 13 in the optical fiber cable 11 is fixed to the core 5, thereby transmitting light. The fiber cord 7 is made with extra length so that no tensile force is directly applied to it. Further, the ground terminal 12 is connected to the core 5.

The present invention relates to high voltage overhead distribution lines, low voltage overhead distribution lines, indoor wiring,
It can be used as a current detector in railway wiring, etc.

[Effects] In the present invention, the position of the electric wire is lowered by the groove to the middle position in the double direction of the insulator, and the magnetic core is placed around it.
Since it is erected, the sensitivity is extremely high compared to those that do not use a core, and there is less shadow V7 from external magnetic fields such as other phase magnetic fields.

If a Faraday effect element that does not exhibit the Pockels effect is used, or if the core and the optical magnetic field sensor are covered with a conductive layer and electrostatically shielded, electrostatic induction will not occur.

It has almost the same shape as a normal insulator, and the grooves for holding the wires are deep, making it easy to install the wires without causing any misalignment.

Because it is built in an insulator, it is mechanically strong and has excellent waterproof properties.
High insulation reliability.

Since the optical magnetic field is used and the input/output lines are made up of optical fibers, noise prevention is compromised.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the invention. 1...Insulator, 2...Groove, 3...Cavity, 4...
Projection portion, 5... Magnetic core, 6... Optical magnetic field sensor, 7
...Optical fiber cord, 8...Electric wire, 9...Bottom cover, 10...Bottle, II...Optical 7 y/cable, 12...Ground terminal, 13...Ten-yeonme /
Ba. Procedural amendments Written by the Commissioner of the Patent Office, Michibu Uga, dated 27th May 1985, 1, Indication of the case, Patent Application No. 215634, 1985, 2, Name of the invention: Optical applied current detector ＼Relationship with the case Patent Applicant 3, Winter Address
5-15 Kitahama, Higashi-ku, Osaka -～---Name (
213) Sumitomo Electric Industries, Ltd. Representative President Kawa
Satoshi Kami, Department 4, Agent Address: 1-9-20 Nishinakajima, Yodoyo-ku, Osaka City
No. 5, Date of amendment order Voluntary amendment 6, Specification subject to amendment Same as Claims column Detailed description of the invention column Same as Drawing 7, Contents of amendment (1) Description in Claims column Correct as shown in the attached sheet. (2) Page 2 of the specification, lines 13 to 19, “The present invention...
...is a feature. ” and insert the following sentence. The present invention has been made in order to solve the problem described in (-), and is a magnetic insulator that has a groove in the upper part and is hollow inside, and has two voids in the protrusion in the cavity caused by the groove. The core is characterized in that one gap is disposed, an optical magnetic field sensor is disposed in the other gap, and an electric wire is sandwiched between the grooves and positioned inside the core. (3) Amend the first drawing as shown in the attached sheet. Claims: (1) an insulator having a groove in its upper part and being located inside the core with two voids sandwiched between the groove and the protrusion in the hollow of the insulator; Applied current detector.

Claims (1)

[Claims] (1) A magnetic core having two voids is placed in the protrusion inside the cavity of an insulator with a groove on the top and a hollow inside, and a magnetic core having two voids is placed in one of the gaps, and an optical magnetic field sensor is placed in the other. The optical current detector is characterized in that the cavity is disposed in the protrusion in the cavity, and further an electric wire is sandwiched between the groove and positioned inside the core.