JP3144137B2 - Fixture of fluorescent fiber and fixing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fixes a fluorescent fiber provided in a container as a discharge light detector for detecting an abnormal discharge generated in an electric device container such as a gas insulated switchgear. And fixing method for fixing.

[0002]

2. Description of the Related Art Fluorescent fibers are recently developed products.
The fluorescent substance in the fluorescent fiber emits light due to light that has entered from the outside, and the light propagates through the fluorescent fiber and exits from both ends similarly to a normal optical fiber. In a normal optical fiber, only light that enters from one end surface propagates through the optical fiber and exits from the other end surface. Nor. As aforementioned,
The major difference between fluorescent fibers is that light that penetrates from the surface over the entire length is transmitted to the end face even if the wavelength or intensity changes through the fluorescent substance. There have been proposed various detectors for detecting abnormal discharge of a battery.
No. 181668, a patent application filed on Sep. 4, 1991 [Serial No. 9104042]).

A container of a gas insulated switchgear to which a fluorescent fiber is attached is generally manufactured by molding a metal plate of several millimeters to several tens of millimeters made of iron or aluminum, in which a high-voltage conductor, a switchgear, and the like are stored. , Generally S
Pressure of the insulating gas is referred to as the F ₆ is sealed,
The shape of the container is mainly cylindrical to ensure mechanical strength enough to withstand high pressure, and its diameter is 0.5 to 1
It is about a meter. The fluorescent fiber according to the present invention is used by being fixed to the inner surface of the metal cylindrical container.

Since the fluorescent fiber is made of a thin synthetic resin having a diameter of about 1 mm, it is necessary to fix the fluorescent fiber inside the gas insulated switchgear by using a holder. However, in practice, there is no specific example of the fixing method of the fluorescent fiber including the above-mentioned publications. The following can be considered as a fixing method of the fluorescent fiber inferred from the wiring or the like routed inside the device.

FIG. 4 is a perspective view showing an example of a fixture for fixing a fluorescent fiber by screwing. In this figure, a fixture for the fluorescent fiber 4 is a seat 21 attached to the inner surface of the container 2 by welding or the like, a fluorescent fiber holder 20 for sandwiching the fluorescent fiber 4 between two plates, and a seat 21 for the fluorescent fiber holder 20. And a screw hole 211, 201 provided in the seat 21 and the fluorescent fiber holder 20, respectively, for screwing the screw 23 and the screw 23. Seat 21 is container 2
When the is manufactured, it is previously attached to a predetermined position by welding or screwing.

The fluorescent fiber 4 is a fluorescent fiber holder 20.
, And then attached to the seat 21 with screws 23 and fixed. FIG. 5 is a perspective view showing an example of a fixture for fixing the fluorescent fiber, which is different from FIG. In this figure,
The seat 21A is formed by forming an elastic thin plate as shown in the figure and attaching it to the container 2, and inserting the fluorescent fiber holder 20 of FIG. 4 into the bent portion 21A1 by utilizing the elasticity of the seat 21A. The fiber holder 20 is fixed by pressing. The fluorescent fiber holder 20 is not limited to the configuration shown in FIG. 4, but may be an appropriate one according to the configuration of the seat 21A.

FIG. 6 is a perspective view showing an example of a fixture for fixing the fluorescent fiber, which is different from FIGS. 4 and 5. In this figure, a seat 21B fixes the fluorescent fiber holder 20 with a flexible binder 21B1 protruding from a portion fixed to the container 2. In this case as well, the fluorescent fiber holder 20 is not limited to the configuration shown in FIG. 4, but may be an appropriate one according to the configuration of the seat 21B.

[0008]

As described above, in the fixture of the fluorescent fiber which can be inferred from the general prior art, the seat 21, 21A or 21B is previously set in the container 2.
It is necessary to attach the fluorescent fiber 4 to the inner wall of the container 2, and work such as screwing is required at the stage of fixing the fluorescent fiber 4 in the container 2. As described above, the inside of the container 2 is so large that it is difficult for an operator to work inside the container 2.
The work of fixing the fluorescent fiber holder 20 to the fluorescent fiber holders 21, 21 </ b> A or 21 </ b> B requires some method from outside the container 2, but has a problem that the workability is extremely poor as can be easily imagined.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem and to provide a fluorescent fiber fixing device and a fixing method capable of easily fixing a fluorescent fiber in a container.

[0010]

According to the present invention, there is provided a fluorescent fiber fixture for fixing a fluorescent fiber for detecting discharge light inside a container to the inside of the container. A ferromagnetic fluorescent fiber holder attached to the container and a permanent magnet installed at a predetermined position on the outer wall of the container, wherein the fluorescent fiber holder is fixed to the inner wall of the container by the attraction force of the permanent magnet through the container wall In addition, the permanent magnet is composed of a permanent fixing permanent magnet attached to the outer wall of the container before the fluorescent fiber fixing operation, and a permanent fixing permanent magnet attached near the temporary fixing permanent magnet after the fixing operation is completed. And

[0011]

In the structure of the present invention, the fixture for the fluorescent fiber is composed of a ferromagnetic fluorescent fiber holder attached to the fluorescent fiber and a permanent magnet attached to a predetermined position on the outer wall of the container. The fluorescent fiber holder is fixed at a position on the inner wall of the container opposite to the mounting position of the permanent magnet by the attractive force generated in the ferromagnetic fluorescent fiber holder by the magnetic flux generated by the permanent magnet. It can be fixed without any need for screwing by simply moving it to

Further, the permanent magnet is divided into a permanent fixing permanent magnet and a permanent fixing permanent magnet, and only the temporary fixing permanent magnet is attached to the outer wall of the container before the fluorescent fiber fixing operation, and the fixing operation is completed. After the permanent magnet for fixing is attached, the permanent magnet for temporary fixing generates a weak suction force sufficient to fix the fluorescent fiber holder in the fixed position during the fixing operation, and the predetermined position of the fluorescent fiber holder is fixed. , And a permanent magnet for fixing can be added and attached to generate a strong attractive force sufficient to maintain the fixed state stably for a long period of time.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is a sectional view of a gas insulated switchgear showing an embodiment of the present invention. In this figure, a container 2 of a gas insulated switchgear is shown.
Has a circular cross section, a high-voltage lead 1 as a high-voltage conductor is disposed in the center, and an insulating gas 3 is sealed in the internal space at a predetermined pressure. In an actual gas insulated switchgear, there is a portion in which three high-voltage leads called three-phase collective buses are arranged at the apexes of a triangle, and a portion in which a circuit breaker is provided. In the container 2, fluorescent fibers 4 are arranged in a circular shape along the inner surface of the container 2 and fixed at four positions by a fluorescent fiber holder 10.

When a discharge is generated from the high voltage lead 1 and discharge light is emitted into the container 2, the fluorescent fiber 4 receives the discharge light, emits a fluorescent substance inside, and the fluorescent light propagates through the fluorescent fiber 4. One end of the fluorescent fiber 4 is connected to a normal optical fiber 5 through a light-tight terminal 7 provided on a flange portion of the conduction hole and is drawn out to a position remote from a place where the gas insulated switchgear is installed. The light guided and propagated to the provided light receiver 6 is converted into an electric signal, and an operation in an electronic circuit such as abnormality determination is performed, and the result is displayed on the display 8.

The fluorescent fiber holder 10 is made of a ferromagnetic material such as steel, and is fixed to the inner wall of the container 2 by the attractive force of a permanent magnet 11 attached to a predetermined position on the outer wall of the container 2. FIG. 2 is a perspective view of the fluorescent fiber holder 10. In this figure, the fluorescent fiber holder 10 has a structure in which a fluorescent fiber is sandwiched between two plates and these plates are bonded or screwed together, similarly to the fluorescent fiber holder 20 described above.

The permanent magnet 11 is fixed at a predetermined position in advance. Since the fixing position is the outer wall of the container 2, the fixing method is simple and the operation is easy regardless of the bonding method or another method. The fluorescent fiber 4 is fixed by the fluorescent fiber holder 10 with the permanent magnets 11 facing each other.
Only to move to the position. Fluorescent fiber holder 1
When 0 comes to a position facing the permanent magnet 11 with the wall of the container 2 interposed therebetween, the magnetic flux generated by the permanent magnet 11 attracts the fluorescent fiber holder 10 and fixes it at that position. Because of such an operation, the operation of fixing the fluorescent fiber can be easily performed even if the operation is performed from the outside of the container 2.

Since the detection range of the discharge light by the fluorescent fiber 4 is wide, the displacement of the position of the fluorescent fiber 4 has little effect on the detection sensitivity. Further, since the fluorescent fiber 4 is highly flexible, the relative positions of the individual fluorescent fiber holders may be slightly shifted. For this reason, there is no practical problem even if the fixing position of the fluorescent fiber holder 10 has an error of about several millimeters. Although high dimensional accuracy cannot be expected by the above-described method of fixing the fluorescent fiber holder 10 by the attractive force of the permanent magnet 11, there is no practical problem for the above-described reason. This is a major reason why the fixing method using the permanent magnet 11 can be adopted.

FIG. 3 is a sectional view showing another configuration of the permanent magnet 11. As shown in FIG. In this figure, the permanent magnet 11 is composed of two layers, a permanent fixing permanent magnet 11A and a permanent fixing permanent magnet 11B, and when the fluorescent fiber holder 10 is attached, only the temporary fixing permanent magnet 11A is placed at a predetermined position. The permanent magnet 11B for permanent fixing is attached when the fixing of the fluorescent fiber holder 10 is completed. The reason why the configuration of the permanent magnet 11 is divided into two is as follows.

Fluorescent fiber holder 1 with permanent magnet 11
The fixing of zero must be continued for several decades during the life of the gas insulated switchgear, and vibrations applied from outside such as earthquakes and vibrations transmitted during the closing / closing operation of the circuit breaker of the gas insulated switchgear. When such a movement in which the attachment position of the fluorescent fiber holder 10 may move due to, for example, the fluorescent fiber is cut,
There is a possibility that the fluorescent fiber holder 10 may fall off and become a conductive foreign matter, thereby lowering the insulation strength and causing dielectric breakdown. Therefore, the permanent magnet 11
Of the fluorescent fiber holder 10 must be sufficiently large. On the other hand, if the suction force is large, there arises a problem that the attaching operation of the fluorescent fiber holder 10 becomes difficult. The above-mentioned permanent magnet 11 is divided into two layers of the permanent magnet 11A for temporary fixing and the permanent magnet 11B for permanent fixing as a measure for solving this problem.

The operation of fixing the fluorescent fiber 4 is performed in the following order. That is, first, the temporary fixing permanent magnet 1
The fluorescent fiber holder 10 is attached while only 1A is attached at a predetermined position. After this operation is completed, the permanent fixing permanent magnet 11B is placed on the temporary fixing permanent magnet 11A.
And attach them. Since the directions of these magnetizations are attached so as to be in the same direction, a strong attractive force acts between them, so that the adhesion is not necessarily required. Permanent magnet 1
By adding 1B, the suction force applied to the fluorescent fiber holder 10 increases, and a suction force that does not change the position even when the above-described vibration or the like is obtained can be obtained.

FIG. 3 shows a configuration in which two permanent magnets are overlapped in the direction of magnetization. This is because the amount of magnetic flux generated by increasing the size of the permanent magnets in the direction of magnetization is increased. Instead of such a configuration, it is also possible to adopt a method of increasing the attraction force by increasing the area of the permanent magnet to increase the amount of generated magnetic flux. As a method therefor, there is a configuration in which two permanent magnets are arranged side by side. As a method of arranging, rectangular permanent magnets may be literally arranged side by side, but in this case, in order to prevent the magnetic center from changing at the beginning and after, for example, one rectangular plate is first used as a temporary fixing permanent magnet. A permanent magnet having a rectangular shape is attached, and two permanent magnets 11B for fixing are also attached to both sides of the permanent magnet. Alternatively, a combination of a circular permanent fixing permanent magnet and a ring-shaped permanent fixing permanent magnet arranged concentrically outside the permanent magnet may be employed.

In addition to the fluorescent fiber holder 10 having a structure in which the fluorescent fiber 4 is sandwiched between two plates as shown in FIG. 2, the holder 10 for holding the fluorescent fiber 4 has the object of the present invention. Various configurations can be employed without departing from the scope of the present invention.

[0023]

As described above, according to the present invention, the fluorescent fiber fixture is constituted by a ferromagnetic fluorescent fiber holder and a permanent magnet attached to a predetermined position on the outer wall of the container. Since the holder is sucked and the fluorescent fiber holder can be fixed at the position on the inner wall of the container opposite to the mounting position of the permanent magnet, the fluorescent fiber holder can be simply moved when the fluorescent fiber is fixed. Since the work such as tightening is not required, the work of fixing the fluorescent fiber holder can be easily performed from the outside of the container, and the effect of shortening the work time for fixing the fluorescent fiber and reducing the cost of electric equipment and the manufacturing time can be obtained. Can be

Further, the permanent magnet is divided into two, a permanent magnet for temporary fixing and a permanent magnet for permanent fixing, and only the permanent magnet for temporary fixing is mounted on the outer wall of the container in advance. By attaching the permanent magnet for fixing, the permanent magnet for temporary fixing generates enough magnetic flux to generate a weak attraction force sufficient to fix the fluorescent fiber holder at the fixing position during the fixing operation, and the fluorescent fiber holder The above-mentioned effect can be further enhanced by facilitating the operation of moving the object to a predetermined position, and then a permanent magnet for fixing is added and attached to generate a strong attraction force, and the fixed state is maintained for a long time. Therefore, there can be obtained an effect that a highly reliable fixing tool and a fixing method can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas-insulated switchgear showing an embodiment of the present invention.

FIG. 2 is a perspective view of the fluorescent fiber holder of FIG. 1;

FIG. 3 is a sectional view showing another configuration of the permanent magnet of FIG. 1;

FIG. 4 is a perspective view showing an example of a fixture for a fluorescent fiber according to the related art.

FIG. 5 is a perspective view showing an example of a fixture different from FIG. 4 in the prior art.

FIG. 6 is a perspective view showing an example of a fixture different from FIGS. 4 and 5 in the related art.

[Explanation of symbols]

 2 container 4 fluorescent fiber 10 fluorescent fiber holder 11 permanent magnet 11A permanent magnet for temporary fixing 11B permanent magnet for permanent fixing

────────────────────────────────────────────────── (5) References JP-A-3-285185 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01R 31/12-31/20 H01F 7 / 00-7/02 H01H 9/50

Claims (8)

(57) [Claims] 1. A fluorescent fiber fixing device for fixing a fluorescent fiber for detecting discharge light inside a container inside the container, comprising: a ferromagnetic fluorescent fiber holder attached to the fluorescent fiber; and a predetermined position on an outer wall of the container. A fluorescent fiber fixing device, comprising: a permanent magnet attached to the container, wherein the fluorescent fiber holder is fixed to the inner wall of the container by an attractive force of the permanent magnet. 2. The permanent magnet according to claim 1, comprising: a permanent magnet for temporary fixing attached to the outer wall of the container before the fixing operation of the fluorescent fiber; and a permanent magnet for permanent fixing attached near the permanent magnet for temporary fixing after the fixing operation is completed. The fluorescent fiber fixture according to claim 1, wherein: 3. A fluorescent fiber fixing method for fixing a fluorescent fiber for detecting discharge light inside a container inside the container, wherein a permanent magnet is attached to a predetermined position on an outer wall of the container and then attached to the fluorescent fiber. A method for fixing a fluorescent fiber, comprising: moving a ferromagnetic fluorescent fiber holder to a position on an inner wall of a container opposite to a position where a permanent magnet is mounted, and fixing the holder to the inner wall of the container by a suction force of the permanent magnet. 4. The permanent magnet comprises a temporary fixing permanent magnet and a permanent fixing permanent magnet, and only the temporary fixing permanent magnet is attached to the outer wall of the container before the fluorescent fiber fixing operation, and after the fixing operation is completed. The method for fixing a fluorescent fiber according to claim 3, wherein the permanent magnet for fixing is attached. 5. The permanent magnet according to claim 1, wherein the permanent magnet comprises a disk-shaped permanent fixing permanent magnet and a ring-shaped permanent fixing magnet having an inner diameter larger than the diameter of the temporary fixing permanent magnet. 3. The fixture according to claim 1, wherein the magnet is mounted concentrically outside the temporary fixing permanent magnet. 6. The permanent magnet for permanent fixing includes a disk-shaped permanent magnet for permanent fixing and a ring-shaped permanent permanent magnet having an inner diameter larger than the diameter of the permanent magnet for temporary fixing. The method according to claim 3 or 4, wherein the magnet is attached concentrically outside the temporary fixing permanent magnet. 7. The permanent magnet comprises a rectangular plate-shaped temporary fixing permanent magnet and two rectangular permanent fixing permanent magnets.
3. The fluorescent fiber fixing device according to claim 1, wherein the permanent fixing permanent magnets are attached with the temporary fixing permanent magnets interposed therebetween. 8. A permanent magnet comprising a rectangular plate-shaped temporary fixing permanent magnet and two rectangular permanent fixing permanent magnets.
The method for fixing a fluorescent fiber according to claim 3 or 4, wherein the permanent fixing permanent magnets are attached with the temporary fixing permanent magnets interposed therebetween.