JPH09127160A - Optical current measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure an electric current with high accuracy even in an environment where vibration and temperature change are large, and to make the measuring device in a compact size. SOLUTION: An insulating spacer 12 is installed between tank flanges 11a, 11b of the end parts of two adjacent tubular tanks 1a, 1b to separate both side tubular tanks 1a, 1b from each other in three dimensions. A flange-like sensor part 13 is disposed between the insulating spacer 12 and the tank flange 11a. The sensor part 13 is fixed together with the insulating spacer 12 to both side tank flanges 11a, 11b. A light transmitting fiber 8 and light receiving fiber 9 are drawn out from the sensor part 13. The fibers 8, 9 are respectively connected to a light source 15 and a detector 16 of a light source and detector part 14 disposed enough apart from the sensor part 13. The light source and detector part 14 is further comprises a signal processing circuit 17 and an output terminal 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current measuring device for measuring a current flowing through a conductor of a gas insulated switchgear or the like, and more particularly to an optical current measuring device for measuring based on a polarization state associated with the Faraday effect of light. Regarding

[0002]

2. Description of the Related Art In a conventional optical current measuring device, a block of quartz, lead glass, or the like is arranged as a sensor at a position extremely close to a conductor, and linearly polarized light is allowed to pass through the sensor to flow through the conductor. The principle is to measure the optical rotation angle caused by the Faraday effect according to the measurement current.

FIG. 20 shows an example of a conventional optical current measuring device. As shown in FIG. 20, a block type sensor 3 made of quartz or lead glass is arranged inside the insulating closed tank 1 so as to surround the conductor 2.
The sensor 3 is fixed to the insulated closed tank 1 via a fixture 4 and an insulating cylinder 5. Here, the insulating cylinder 5 is
Insulated closed tank 1 at ground potential and conductor 2 at high voltage
It is provided to ensure insulation between and. Also,
An optical system storage container 6 is attached to the outside of the insulating closed tank 1, and a coupling optical system 7 including a lens, an analyzer and the like is stored in the optical system storage container 6. The coupling optical system 7 is optically coupled to the sensor 3 via the space formed by the insulating cylinder 5. Further, one end of the light transmitting fiber 8 and one end of the light receiving fiber 9 are incorporated in the coupling optical system 7, and the light transmitting fiber 8 and the light receiving fiber 9 penetrate the optical system storage box 6. External devices such as a light source and a detector are connected to the other end, which is arranged and not shown.

In such an optical current measuring device of FIG. 20, the operating principle of the optical system is as follows. That is, the light emitted from a light source (not shown) is guided to the coupling optical system 7 through the light transmitting fiber 8, and in this coupling optical system 7, a linearly polarized beam 10a of a substantially parallel light flux.
Then propagates through the space and enters the sensor 3. Sensor 3
The light that has entered the sensor 3 is emitted from the sensor 3 after being Faraday-turned while revolving around the conductor 2 in the form of being repeatedly reflected inside the sensor 3. That is, the light passing through the sensor 3 rotates its polarization plane by a certain angle due to the Faraday effect induced by the current flowing through the conductor 2. Then, the emitted light thus Faraday-rotated becomes a linearly polarized beam 10b, propagates in the space, and again travels to the coupling optical system 7, passes through the analyzer and the lens, and then enters the light receiving fiber 9. Note that the configuration and operation of the coupling optical system 7 described here are already known matters, and thus description thereof will be omitted.

[0005]

By the way, in the conventional optical current measuring device using the block type sensor as described above, a straight line for current measurement in the high pressure insulating gas in the insulating closed tank 1 is used. Polarized beams 10a, 10b
Will be propagated. Therefore, as the current flowing through the conductor 2 increases, the conductor 2 generates heat, the insulating gas is heated, the gas density locally changes, and convection occurs. As a result, the refractive indices of the propagation paths of the linearly polarized beams 10a and 10b for measurement change irregularly, causing fluctuations in the beams. This beam fluctuation is equivalent to a change in the optical axis of the optical system or an irregular change in the sensitivity of the sensor 3, and thus causes a significant decrease in current measurement accuracy.

Further, such a conventional optical current measuring device has a vibration and a temperature change (-20 to 90) which occur in the field.
It has the drawback of increasing its error with respect to (.degree. C.).
That is, an amorphous solid such as glass generally used as a Faraday effect material has optical isotropy, but when stress is applied to the glass from the outside, the glass becomes optically anisotropic and birefringent. , Which contributes to the measurement error. Further, when temperature changes occur in the glass, stress is generated, but when the glass is firmly fixed to substances having different coefficients of thermal expansion, the stress inside the glass caused by the temperature change is higher than that of the glass alone. It becomes considerably large, and this also contributes to the measurement error.

Further, in such a conventional optical current measuring apparatus, as shown in FIG. 20, a considerable space is required for fixing a block type sensor and taking out a measuring beam. There is also a problem that it is difficult to make the entire device compact.

The present invention has been proposed to solve the above-mentioned problems of the prior art.
An object of the present invention is to provide an optical current measuring device which can measure current with high accuracy even in an environment where vibration and temperature change are large and which can be made compact.

More specifically, the first object is to avoid the optical axis change of the optical system due to the temperature change by shortening the spatial propagation distance of the measurement beam by using the sensor fiber,
It is to improve the measurement accuracy. A second object is to support the sensor fiber under free outer circumference support conditions, thereby avoiding the influence of vibration and temperature change on the birefringence of the fiber and improving the measurement accuracy. The third purpose is
By configuring the sensor fiber so that there is no current-carrying portion other than the conductor to be measured in the loop formed by the sensor fiber, the current flowing in the loop of the sensor fiber is limited to the current to be measured, and the measurement accuracy is improved.

A fourth object is that the sensor unit is attached to the flange joint between the tubular tanks, and the size of the entire insulated hermetically sealed tank is substantially increased as compared with the case where the sensor unit is not attached, and the size is compact. This is to configure a simple optical current measuring device. A fifth object is to avoid inconvenient mechanical interference such as entanglement between adjacent turns when using a plurality of sensor fibers or when configuring the sensor fibers with a plurality of turns. Is to improve the reliability of. A sixth object is to improve the reliability of the optical component by realizing a watertight structure that is sufficient to avoid the intrusion of moisture from the outside in the installation space of the optical component that does not like moisture.

A seventh object is to attach a sensor part to a flange joint between tubular tanks to realize a high measurement accuracy and to easily make an electrical connection between the tubular tanks. It is applicable to the gas insulated switchgear of. An eighth object is to facilitate the assembly of sensor fiber and optics. A ninth object is to facilitate the assembly of the entire insulated closed tank when the sensor unit is attached to the flange joint between the tubular tanks of the sensor unit.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a sealed tank formed by joining a plurality of tubular tanks to each other through flanges provided at respective tank ends. The energization of a gas-insulated device, which is filled with an insulating gas, has an energizing conductor arranged in the axial direction of the closed tank, and selectively attaches an insulating spacer for spatially separating the tubular tank to the flange of the tubular tank. An optical current measuring device for measuring a current flowing through a conductor based on a polarization state associated with the Faraday effect of light is characterized in that the sensor part is particularly configured as follows.

[1. Invention of Claim 1] The invention of claim 1 is characterized by having an annular insulating member, an optical fiber, and an optical device. That is, the annular insulating member is disposed between one of the flanges of the tubular tank and a flange of another tubular tank joined to this flange. The optical fiber is arranged in a wound state in a fiber arrangement space formed in a part of a range including the annular insulating member and its outer peripheral space, and is attached to the annular insulating member. An optical device is optically coupled to the optical fiber,
Light for measurement is incident on the optical fiber, and light passing through the optical fiber is emitted to the outside.

According to the first aspect of the present invention having such a configuration, since the spatial propagation distance of the measurement beam can be shortened by using the optical fiber as the sensor, the optical axis change of the optical system due to the temperature change can be avoided. The measurement accuracy can be improved. Further, by using the annular insulating member, it is possible to prevent the current-carrying part other than the conductor from existing in the loop formed by the optical fiber, so that the current flowing in the loop of the optical fiber is limited to the measured current. The measurement accuracy can be improved. Furthermore, by installing the sensor unit at the flange joint between the tubular tanks, a compact optical current measuring device can be realized without increasing the size of the entire insulated closed tank as compared with the case where this sensor unit is not installed. Can be configured.

[2. Inventions of Claims 2 and 3] Each of the inventions of claims 2 and 3 is characterized by the configuration of the fiber arrangement space. The invention according to claim 2 is characterized in that, in the invention according to claim 1, the fiber arrangement space and the optical fiber are configured as follows. That is, the fiber disposition space has a size larger than the fiber diameter of the optical fiber, and the optical fiber is disposed in the fiber disposition space under free outer circumference support conditions. The invention according to claim 3 is the invention according to claim 2, further characterized in that a cushioning material is arranged around the optical fiber in the fiber arrangement space.

According to the second and third aspects of the present invention having the above-mentioned structure, the optical fiber for the sensor is supported under the condition that the outer circumference is freely supported, so that the birefringence of the fiber due to vibration or temperature change is influenced. It is possible to avoid it and improve the measurement accuracy. In particular, according to the third aspect of the present invention, it is possible to reduce the influence of the mechanical force applied to the optical fiber sensor for the sensor and further improve the measurement accuracy.

[3. Inventions of Claims 4 to 7] Claim 4
Each of the inventions described in (1) to (7) is characterized by the form of arrangement of optical fibers. A fourth aspect of the invention is characterized in that, in the first or second aspect of the invention, the optical fibers are arranged in a spiral shape. According to a fifth aspect of the invention, in the invention of the fourth aspect, the optical fiber is
A plurality of optical fibers forming a plurality of sensors, wherein the plurality of optical fibers are arranged in layers in a radial direction of the annular insulating member, and each of the plurality of optical fibers is arranged in a spiral shape. It is characterized by being done.

The invention according to claim 6 is the invention according to claim 1 or 2.
In the invention described above, the optical fibers are arranged in a spiral shape. According to a seventh aspect of the invention, in the sixth aspect of the invention, the optical fibers are a plurality of optical fibers forming a plurality of sensors, and the plurality of optical fibers are directed in an axial direction of the annular insulating member. The optical fibers are arranged in layers, and each of the plurality of optical fibers is arranged in a spiral shape.

According to each of the inventions of claims 4 to 7 having the above-mentioned structure, the optical fiber for the sensor can be easily arranged in a plurality of turns. In particular, claims 5 and 7
According to the described invention, it is possible to easily and compactly arrange a plurality of optical fibers, each of which is composed of a plurality of turns.

[4. Inventions of Claims 8 to 15] Each of the inventions of Claims 8 to 15 is characterized by the configuration of fiber supporting means for supporting an optical fiber. Claim 8
In the invention described in any one of claims 1 to 7, the described invention forms the fiber arrangement space, and a fiber supporting means for supporting the optical fiber is arranged in the fiber arrangement space. It is characterized by that.

According to a ninth aspect of the invention, in the eighth aspect of the invention, the optical fiber is wound with a plurality of turns, and the fiber supporting means forms a plurality of the fiber disposition spaces. It is characterized in that the optical fibers are individually supported for each turn in the plurality of fiber disposition spaces, and adjacent turns are separated from each other.

According to a tenth aspect of the present invention, in the eighth aspect of the present invention, the optical fibers are a plurality of optical fibers constituting a plurality of sensors, and the fiber supporting means is a plurality of the fiber arrangement spaces. Is formed, and each of the plurality of optical fibers is individually supported in the plurality of fiber disposition spaces, and adjacent optical fibers are separated from each other.

According to the eleventh aspect of the present invention, the optical fibers are a plurality of optical fibers forming a plurality of sensors, and each of the plurality of optical fibers is wound with a plurality of turns and the fiber support is provided. Means form a plurality of layers of the plurality of fiber disposition spaces, individually support each of the plurality of optical fibers in each of the plurality of layers of the plurality of fiber disposition spaces, and adjoin each other. It is characterized in that the optical fibers and the adjacent turns are separated from each other.

The invention according to claim 12 is the invention according to claims 8 to 11.
In the invention described in any one of the above items, the fiber supporting means is a partition plate for separating the adjacent optical fibers. According to a thirteenth aspect of the present invention, in the invention according to any one of the eighth to eleventh aspects, the fiber support means is a support seat provided at a plurality of locations on the outer circumference of the annular insulating member. I am trying. A fourteenth aspect of the present invention is characterized in that, in the thirteenth aspect, the support seat has a plurality of holes for individually supporting the optical fibers. A fifteenth aspect of the invention is characterized in that, in the thirteenth aspect, the support seat has a plurality of U-shaped groove portions for individually supporting the optical fibers.

[0025] Claims 8 to 15 having the above structure
According to each of the above-mentioned inventions, in the case of using the optical fibers for a plurality of sensors, or in the case of configuring the fiber for a sensor with a plurality of turns, the fiber supporting means causes an optical fiber between adjacent turns or adjacent optical fibers. It is possible to avoid inconvenient mechanical interference such as entanglement between
The reliability of the optical fiber for the sensor can be improved.

[5. Inventions of Claims 16 to 18] Each of the inventions of claims 16 to 18 is characterized by a mold structure in the annular insulating member. According to a sixteenth aspect of the invention, in the invention according to any one of the first to fifteenth aspects, the optical fiber is molded in the annular insulating member.

A seventeenth aspect of the present invention is characterized in that, in the sixteenth aspect of the present invention, the optical fiber is molded in the annular insulating member via a partition plate forming the fiber arrangement space. There is. The invention according to claim 18 is the invention according to claim 16 or 17, characterized in that the optical device is molded in the annular insulating member together with the optical fiber.

Claims 15 to 1 having the structure as described above
According to each invention described in 8, since the optical fiber and the optical device are molded in the annular insulating member, a watertight structure sufficient to prevent the intrusion of moisture from the outside can be obtained, and the optical fiber and the optical device are obtained. The reliability of can be improved. Also,
The sensor unit can be made compact and easy to assemble.

[6. Inventions of Claims 19 to 21] Each of the inventions of Claims 19 to 21 is characterized by an electrical connection structure of a flange joint portion of a tubular tank. The invention according to claim 19 is the invention according to any one of claims 1 to 18, wherein the flanges of the tubular tanks on both sides of the annular insulating member are electrically connected to each other. It is characterized in that a connecting member is provided.

The twentieth aspect of the invention is characterized in that, in the nineteenth aspect of the invention, the connecting member is a conductive cover. The invention according to claim 21 is characterized in that, in the invention according to claim 19, the connecting member is a shunt bar.

Claims 19 to 2 having the above structure
According to each of the inventions described in 1, the sensor unit is attached to the flange joint between the tubular tanks to realize high measurement accuracy, and the electrical connection between the tubular tanks can be easily performed. It is applicable to point-grounded gas insulated switchgear.

[7. Invention of Claims 22 and 23] Each of the inventions of Claims 22 and 23 is characterized by the arrangement or mounting structure of the annular insulating member. The invention according to claim 22 is the invention according to any one of claims 1 to 21, wherein when the insulating spacer is attached to the flange of the tubular tank, the annular insulating member is
It is characterized in that it is arranged between the flange of another tubular tank joined to the flange and the insulating spacer.

According to a twenty-third aspect of the present invention, in the twenty-third aspect of the invention, the annular insulating member is attached to the gas circuit breaker when the insulating spacer is directly connected to the flange of the gas circuit breaker. It is characterized by being attached to the flange of the equipment.

22 and 2 having the above-mentioned structure
According to each of the inventions described in 3, the sensor unit is mounted so as to be sandwiched between the insulating spacer and the flange of the tubular tank, so that the size of the entire insulated closed tank is substantially increased as compared with the case where the sensor unit is not mounted. Without doing so, a compact optical current measuring device can be configured. Further, according to the invention of claim 23, since it is not necessary to disassemble the gas circuit breaker when performing maintenance of the sensor portion, the maintainability is excellent.

[8. Invention of Claims 24 to 26] Each of the inventions of Claims 24 to 26 is characterized by the arrangement or mounting structure of the annular metal member. A twenty-fourth aspect of the present invention is the invention according to any one of the first to fifteenth aspects, which surrounds the outer periphery of the annular insulating member and forms the fiber arrangement space between the annular insulating member and the outer peripheral surface of the annular insulating member. It is characterized in that an annular metal member is provided.

The invention as set forth in claim 25 is characterized in that, in the invention as set forth in claim 24, the annular metal member is arranged so as to electrically connect the flanges on both sides thereof. The invention according to claim 26 is the invention according to claim 25, wherein the insulating spacer is attached to the flange of the tubular tank, and the insulating spacer has an insulating member and a metal flange portion on an outer periphery thereof. The metal member is arranged so as to electrically connect between a flange of another tubular tank joined to the flange of the tubular tank and the metal flange portion of the insulating spacer.

24 to 2 having the above-mentioned structure
According to each of the inventions described in 6, since the tubular tanks can be electrically connected by the annular metal member forming the fiber disposition space on the outer periphery of the annular insulating member, it is not necessary to use a special connecting member. In addition, it is applicable to a gas-insulated switchgear of a multipoint grounding system.

[9. Invention of Claim 27] Claim 27
The described invention is the invention according to any one of claims 24 to 26, wherein the annular metal member is configured to form an optical device installation space in a part of an outer periphery of the fiber installation space. The optical device is arranged in the optical device installation space and is supported by the annular metal member. 28. Having such a configuration
According to the described invention, the sensor unit can be made compact and the assembly is easy.

[10. Invention of Claims 28-32] Each of the inventions of Claims 28-32 is characterized by a watertight structure of the optical equipment installation space. According to a twenty-eighth aspect of the present invention, in the twenty-seventh aspect, the annular metal member has a watertight structure capable of ensuring watertightness of the fiber installation space and the optical device installation space therein. Is characterized by.

A twenty-ninth aspect of the invention is the invention of the twenty-eighth aspect, wherein the watertight structure includes a watertight means disposed between the annular metal member and the flange of the tubular tank. I am trying. The invention according to claim 30 is the invention according to claim 28, wherein when the insulating spacer is attached to the flange of the tubular tank, the watertight structure is disposed between the annular metal member and the insulating spacer. It is characterized by including a watertight means provided. The invention of claim 31 is characterized in that, in the invention of claim 29 or 30, the watertight means is an elastic member. The invention according to claim 32 is
The invention according to claim 29 or 30 is characterized in that the watertight means is an adhesive.

28 to 3 having the above-mentioned structure
According to each invention described in 2, in the space where the optical fiber and the optical device are arranged, a watertight structure sufficient to prevent the intrusion of moisture from the outside can be obtained, and the reliability of the optical fiber and the optical device is improved. can do.

[11. Invention of Claim 33] Claim 3
The invention according to claim 3 is the invention according to any one of claims 24 to 32, wherein the annular metal member has a plurality of bolt holes for mounting the flange of the tubular tank, and the optical device includes: The optical fiber is arranged between two adjacent bolt holes, and the optical fiber is arranged so that the bolt hole is not located inside the loop formed by the optical fiber.

The invention of claim 33 having the above-mentioned structure is applied to a gas-insulated switchgear of a multipoint grounding system, and even when a sheath current is passed through a bolt or a stud penetrating the bolt hole, the optical fiber Since the current flowing in the loop formed by is only the measured current flowing through the conductor, the measurement accuracy can be improved.

[12. Inventions of Claims 34 to 36] Each of the inventions of Claims 34 to 36 is characterized by a temporary fixing structure for attaching an annular structure composed of an annular insulating member and an annular metal member to a flange of a tubular tank. Have. The invention according to claim 34 is the invention according to any one of claims 24 to 33, wherein the annular metal member is integrally fixed to the annular insulating member to form one annular structure, Between the annular metal member and the flange of the tubular tank, a temporary fixing structure capable of attaching the annular structure to the flange of the tubular tank is provided.

According to a thirty-fifth aspect of the present invention, in the thirty-fourth aspect of the present invention, the annular metal member has a plurality of bolt holes for mounting the flange of the tubular tank, and the temporary fixing structure is adjacent. A plurality of counterbored holes provided between the two bolt holes and a plurality of screw holes provided at positions corresponding to the counterbored holes of the flange of the tubular tank. The annular structure can be attached to the flange of the tubular tank via a temporary fixing screw corresponding to the hole.

According to a thirty-sixth aspect of the present invention, in the thirty-fourth aspect of the present invention, the annular metal member has a plurality of bolt holes for mounting the flange of the tubular tank, and the temporary fixing structure is adjacent to each other. A plurality of screw holes provided between the two bolt holes and a plurality of counterbored drill holes provided at positions corresponding to the screw holes of the flange of the tubular tank; The annular structure can be attached to the flange of the tubular tank via a corresponding temporary fixing screw.

Claims 34 to 3 having the above structure
According to each of the inventions described in 6 above, in each case, due to the temporary fixing structure,
The insulating hermetically sealed tank can be easily assembled by the same assembly process as in the case where the sensor unit including the annular structure is not attached.

[13. Inventions of Claims 37 to 39] Each of the inventions of claims 37 to 39 is characterized by an arrangement or attachment structure of an annular insulating member and an annular metal member. The invention according to claim 37 is the invention according to any one of claims 24 to 36, wherein when the insulating spacer is attached to the flange of the tubular tank,
The annular insulating member and the annular metal member are disposed between the insulating spacer and a flange of another tubular tank joined to the flange.

According to a thirty-eighth aspect of the present invention, in the thirty-seventh aspect of the present invention, when the insulating spacer is directly connected to the flange of the gas circuit breaker, the annular insulating member and the annular metal member are provided with the gas interrupting member. It is characterized in that it can be attached to the flange of other equipment attached to the container. A thirty-ninth aspect of the invention is the invention according to any one of the twenty-fourth to thirty-sixth aspects, wherein the annular insulating member and the annular metal member are joined to one of the flanges of the tubular tank and this flange. It is characterized in that it is arranged between the flanges of other tubular tanks and is directly connected to the flanges on both sides thereof without the insulating spacers interposed therebetween.

37 to 3 having the above-mentioned structure
According to each invention described in 9, the sensor unit is mounted so as to be sandwiched between the insulating spacer and the flange of the tubular tank, so that the size of the entire insulated closed tank is increased in comparison with the case where the sensor unit is not mounted. Without doing so, a compact optical current measuring device can be configured. Further, according to the invention of claim 38, since it is not necessary to disassemble the gas circuit breaker when performing maintenance of the sensor portion, the maintainability is excellent. Further, according to the invention of claim 39, regardless of the presence or absence of the insulating spacer, the sensor portion can be arranged at an arbitrary tank-to-tank flange joint portion in the gas-insulated switchgear, which is excellent in design freedom. .

[0051]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of an optical current measuring device according to the present invention will be specifically described below with reference to the drawings. It should be noted that the same parts as those of the above-described conventional technique are designated by the same reference numerals and the description thereof will be omitted.

[1. First Embodiment] [1-1. Configuration] FIG. 1 to FIG. 4 show the first embodiment according to the present invention, which are claims 1, 2, 6, 8, 9, 12, and 1.
It shows one mode in the case of carrying out each invention described in 6 to 18, 22.

[1-1-1. Outline of Configuration] FIG.
It is a block diagram which shows the outline of the optical-type electric current measuring apparatus of embodiment of this. As shown in FIG. 1, of the insulated closed tanks 1 of the gas insulated switchgear, two adjacent tubular tanks 1
An insulating spacer 12 is attached between the tank flanges 11a and 11b at the ends of a and 1b to spatially separate the tubular tanks 1a and 1b on both sides. Further, a flange-shaped sensor portion 13 is arranged between the insulating spacer 12 and the one tank flange 11a. This sensor unit 13 is, together with the insulating spacer 12,
It is fixed to the tank flanges 11a and 11b on both sides.

A light transmitting fiber 8 and a light receiving fiber 9 are drawn out from the sensor section 13, and these fibers 8 and 9 are located at a position sufficiently distant from the sensor section 13 to provide a light source / detector section. Fourteen light sources 15 and one detector 16 are connected to each. Of these, the light source 15 is a laser light source that emits laser light for measurement, and the detector 16 is
It is configured to detect the output from the sensor unit 13 and convert it into an electric signal. The light source / detector unit 14 further includes a signal processing circuit 17 that calculates an output signal from the detector 16 to calculate a conduction current, and an output terminal 18 that outputs the calculation result to the outside.

[1-1-2. Configuration and Operating Principle of Optical System] FIG. 2 is an illustrative view showing the optical system of the first embodiment. In FIG. 2, a portion surrounded by a dotted line is housed in the sensor unit 13, and has a sensor fiber 19 and a coupling optical box (optical device) 20. Sensor fiber 1
9 is arranged around the conductor in a wound state, one end thereof is connected to the coupling optical box 20, and the other end thereof is provided with the reflecting material 2.
1 is arranged. The coupling optical box 20 is connected to one end of the sensor fiber 19 and is also connected to the light source / detector unit 14 via the light transmitting fiber 8 and the light receiving fibers 9a and 9b.

The combined optical box 20 includes lenses 22a to 2a.
2d, a polarizer 23a, analyzers 22b and 23c, and beam splitters 24a and 24b. Of these, the lens 22a, the polarizer 23a, the beam splitter 24a,
The lens 22b and the lens 22b are arranged in this order so as to guide the incident light from the light transmitting fiber 8 to the sensor fiber 19 via the holder 25. The beam splitter 24b is
Beam splitter 24 returned from sensor fiber 19
It is arranged on the optical path of the light reflected by a. The analyzer 23 is provided on each of the optical paths divided by the beam splitter 24b.
b and lens 22c, and analyzer 23c and lens 22d
Are arranged so as to guide light to the respective light receiving fibers 9a and 9b. Of these, the analyzers 23b, 2
3c are arranged so as to be orthogonal to each other. In addition,
Since the configuration of the light source / detector unit 14 is as described above, the description thereof is omitted here.

The operating principle of the optical system shown in FIG. 2 is as follows. That is, the laser light emitted from the light source 15 of the optical / detector unit 14 enters the coupling optical box 20 through the light transmitting fiber 8. Combined optical box 2
The laser light incident on 0 is converted into a parallel beam by the lens 22a, linearly polarized by the polarizer 23a, reaches the lens 22b via the beam splitter 24a, and is condensed by the lens 22b. The laser light focused by the lens 22b is incident on one end of the sensor fiber 19 via the holder 25, passes through the inside of the sensor fiber 19, and then reaches the reflecting material 21 arranged at the other end and reaches the reflecting material 21. It is reflected by 21, returned in the opposite direction in the sensor fiber 19, and returned to the coupling optical box 20 via the holder 25 again.

The laser light returned to the coupling optical box 20 reaches the beam splitter 24a via the lens 22b, is reflected by the beam splitter 24a, and is further divided into two by the beam splitter 24b. The laser beams split into two by the beam splitter 24b are analyzed by the analyzers 23b and 23c arranged so as to be orthogonal to each other.
After passing through each of the above, the light is guided to each of the light-receiving fibers 9a and 9b through the lenses 22c and 22d. The outputs from the light receiving fibers 9a and 9b are converted into electric signals by the detector 16 of the light source / detector unit 14. Further, the output signal from the detector 16 is calculated by the processing circuit 17, and the calculation result is output to the outside by the output terminal 18.
Note that a specific signal processing method in this case is publicly known and is not a direct object of the present invention, and therefore description thereof is omitted here.

[1-1-3. Configuration of Sensor Unit] FIG.
It is sectional drawing which shows the concrete structure of the sensor part 13 periphery of 1st Embodiment. As shown in FIG. 3, the insulating member 31
At the mounting portion of the insulating spacer 12 composed of the metal flange portion 32 on the outer periphery of the tank flange 11a, the outer peripheral portion of the end surface of the tank flange 11a at the end portion of the one tubular tank 1a is counterbored. The annular insulating member 33 is provided.

The sensor fiber 19 and the coupling optical box 20 are molded inside the annular insulating member 33. Among these, as shown in FIG. 4, the sensor fiber 19 is spirally arranged around the conductor 2. Further, as shown in FIG. 3, the sensor fiber 19 is molded on the outer peripheral side in the annular insulating member 33 via a partition plate 34. The partition plate 34 forms a fiber arrangement space having a size larger than the fiber diameter of the sensor fiber 19 in the annular insulating member 33, and the sensor fiber 19 is freely supported on the outer periphery in this fiber arrangement space. Sensor fiber 1
It is configured to separate a plurality of nine turns.
Here, the inner diameter of the annular insulating member 33 is equal to the insulating spacer 12
Is smaller than the inner diameter of the metal flange portion 32.

The annular insulating member 33 in which the sensor fiber 19 is molded in this way, together with the insulating spacer 12, is attached to the tank flanges 11 on both sides by bolts 35.
It is fixed to a and 11b. In addition, tank flange 1
An O-ring 36 is provided between the insulating members 31 of the insulating spacer 12 and the la-rings 1a and 11b to secure the airtightness of the joint.

[1-2. Action / Effect] According to the optical current measuring device of the first embodiment having the above configuration, the following action / effect can be obtained.

Improvement of measurement accuracy by the configuration of the sensor unit 13 First, the tank flanges 11a of the tubular tanks 1a, 1b,
Since the sensor part 13 using the sensor fiber 19 is arranged at the joint part of 11b, like the above-mentioned conventional device,
It is no longer necessary to propagate the measuring beam in the heated gas in the tank. Since the sensor fiber 19 is thus arranged at the joining portion of the tank flanges 11a and 11b, the entire spatial propagation distance of the measurement beam is the block type sensor 3 as in the conventional device.
Is greatly shortened as compared with the case where is arranged in the conductor 2 part. Therefore, it is possible to avoid a change in the optical axis of the optical system due to a change in temperature, and it is possible to measure current with high accuracy.

Further, since the sensor fiber 19 is supported under the condition of free support of the outer circumference in the fiber arrangement space having a size larger than the fiber diameter, vibration is more likely to occur than when the sensor is fixed as in the conventional device. It is possible to avoid the influence on the birefringence of the fiber due to the temperature change and the temperature change, and from this point, it is possible to measure the current with high accuracy.

Further, since the inner diameter of the annular insulating member 33 in which the sensor fiber 19 is molded is made smaller than the inner diameter of the metal flange portion 32 of the insulating spacer 12 joined to the annular insulating member 33, the sensor fiber 19
There is no current-carrying part other than the conductor 2 in the loop formed by. Therefore, the return current and the sheath current do not flow in the loop portion of the sensor fiber 19. Therefore, since the current flowing in the loop formed by the sensor fiber 19 is only the measured current flowing in the conductor 2, it is possible to measure the current with high accuracy according to Ampere's law.

As described above, in the first embodiment, the influence of vibration and temperature change can be avoided as much as possible by using the sensor fiber 19 and the arrangement and configuration thereof.
Since there is no current-carrying part that affects the measurement between the sensor fiber 19 and the conductor 2, it is possible to measure the current with high accuracy.

Light source / detector unit 1 for sensor unit 13
4. Improvement of measurement accuracy by remote placement of 4 and fiber connection Since the light source / detector unit 14 is placed at a position distant from the sensor unit 13, the light source 15 and the detector 16, which are vulnerable to environmental changes, can be changed by temperature change, vibration, It can be placed avoiding areas where electrical noise is severe. Further, since the sensor unit 13 and the light source / detector unit 14 are connected by the light transmitting fiber 8 and the light receiving fibers 9a and 9b, it is possible to avoid an external influence on the transmission beam, and , Electrical insulation becomes easy. Therefore, highly accurate current measurement is possible.

The structure of the sensor section 13 makes the apparatus compact, facilitates assembly, and improves reliability of optical parts. The sensor fiber 19 and the coupling optical box 20 are connected to each other by the annular insulating member 3.
3 is integrally molded into the inside of the sensor unit 13 to form the sensor unit 13. Since the sensor unit 13 is attached so as to be sandwiched between the insulating spacer 12 and the tank flange 11a of the tubular tank 1a, the sensor unit 13 is not attached. A compact optical current measuring device can be configured without increasing the size of the entire insulated closed tank 1 as compared with the case.

Further, since the sensor fiber 19 and the coupling optical box 20 are integrally molded in the annular insulating member 33 to form the sensor portion 13 as described above, the sensor fiber 19 and the coupling optical box 20 are combined. There is also an advantage that it is easy to assemble. Further, since the sensor fiber 19 is arranged in a spiral shape and the turns are separated by the partition plate 34, it is possible to easily arrange a plurality of turns of the fiber, and the adjacent turns are arranged. Avoiding inconvenient mechanical interference such as entanglement between the sensor fiber 19
The reliability of can be improved.

Further, although the sensor fiber 19 and the optical parts in the coupling optical box 20 do not like water, they are molded in the annular insulating member 33, so that it is sufficient to prevent the intrusion of water from the outside. A watertight structure can be obtained and the reliability of the optical component can be improved.

[1-3. Modification] As a modification of the first embodiment, for example, a plurality of 1-turn sensor fibers 19 forming a plurality of sensors are radially arranged in layers and a partition plate is provided between adjacent fibers. A similar configuration is also conceivable via 34. In this case, the number of the coupling optical box 20 or the number of optical components inside the coupling optical box 20 increases depending on the number of sensors, but the basic configuration is exactly the same as the configuration shown in FIG.

[2. Second Embodiment] FIGS.
As a second embodiment according to the present invention, claims 4 to 1
It has shown the some form which concerns on arrangement | positioning of the sensor fiber 19 at the time of implementing each invention of 2,16,17. FIG.
Shows a form in which the sensor fiber 19 is spirally arranged around the conductor 2 according to the invention of claim 4. Even in the case of arranging in this way, as in the case of arranging in a spiral shape as in the first embodiment, it is possible to easily arrange a fiber of a plurality of turns.

In FIG. 6, a plurality of sensor fibers 19 are arranged in layers in the radial direction of the annular insulating member 33 and a plurality of sensor fibers 19 are provided in accordance with the inventions of claims 4, 5 and 8 to 12. 2A and 2B are arranged spirally around the conductor 2. Further, FIG. 7 shows claims 6 to 1.
According to each invention described in 2, the plurality of sensor fibers 19 are arranged in layers in the axial direction of the annular insulating member 33, and each of the plurality of sensor fibers 19 is spirally arranged around the conductor 2. Is shown.

In each of the embodiments shown in FIGS. 6 and 7, a plurality of sensor fibers 19 and a plurality of turns of each sensor fiber 19 are separated by a partition plate 34. That is, the partition plate 34 forms a fiber disposition space having a size larger than the fiber diameter of the sensor fiber 19, and the sensor fiber 19 is supported in the fiber disposition space under free outer circumference support conditions.

Then, (A) of FIG. 6 and (A) of FIG.
The figure shows a configuration in which the sensor fiber 19 is attached to the outer peripheral surface and the end surface of the annular insulating member 33, respectively. 6B and 7B, according to the inventions of claims 16 and 17, the sensor fiber 19 is provided inside the annular insulating member 33 as in the first embodiment. A molded form is shown.

In the case of such a configuration, FIG. 6 and FIG.
In any of the above configurations, a fiber arrangement space having a size larger than the fiber diameter is formed around the sensor fiber 19, and the sensor fiber 1 is arranged in the fiber arrangement space.
Since 9 is supported on the outer circumference free supporting condition, the influence on the birefringence of the fiber due to vibration or temperature change can be avoided as in the first embodiment, and high-precision current measurement is possible. is there. In addition, a plurality of sensor fibers 19
It is possible to easily and compactly dispose while configuring each of the plurality of turns.

In particular, in the configurations of FIGS. 6B and 7B, the sensor fiber 19 is molded in the annular insulating member 33, so that the sensor fiber 19 can be easily assembled from this point as well. In addition, a watertight structure sufficient to prevent the intrusion of moisture from the outside can be obtained, and the reliability of the sensor fiber 19 can be improved.

[3. Third Embodiment] FIG. 8 shows the third embodiment according to the present invention.
One form when each invention of 8, 9, 12, 16-22 is implemented is shown. Specifically, in the third embodiment, in addition to the structure of the first embodiment shown in FIGS. 1 to 4, the conductive cover 37 or the shunt bar is provided between the tank flanges 11a and 11b. This is a modified example in which the connection is made electrically at 38. That is, the other parts are configured in the same manner as in the first embodiment.

The third embodiment configured as described above is
It is suitable as an optical current measuring device for a gas-insulated switchgear of a multipoint grounding system. That is, in the first embodiment, since the tubular tanks 1a and 1b are electrically insulated from each other by the insulating spacer 12, the gas insulated switchgear of the single-point grounding system can be applied. Tubular tank 1
It is not suitable for a gas-insulated switchgear of a multipoint grounding system which requires electrical connection between a and 1b. On the other hand, in the third embodiment, the conductive cover 37 or the shunt bar 3 is used.
8, tubular tanks 1a, 1b of the gas insulated switchgear
Since they can be electrically connected to each other, they are suitable for a gas-insulated switchgear of a multipoint grounding system. It is also suitable for a gas-insulated switchgear of a single-point ground system.

[4. Fourth Embodiment] FIG. 9 shows a fourth embodiment according to the present invention in which each of the inventions according to claims 22 and 23 is implemented. That is, in the fourth embodiment, when the insulating spacer 12 is directly connected to the tank flange 11b of the gas circuit breaker 39, the sensor unit 13 is attached to the tank flange 11a of the tubular tank 1a of another device. Is. In the fourth embodiment configured in this way, particularly when performing maintenance on the sensor fiber 19 of the sensor unit 13, there is no need to disassemble the gas circuit breaker 39, and maintenance is excellent.

[5. Fifth Embodiment] [5-1. Configuration] FIGS. 10 and 11 show a fifth embodiment of the present invention.
As an embodiment of the present invention, claims 1, 2, 4, 8, 9, 1
It shows one mode when each invention described in 2, 24 to 31, 37 is carried out. FIG. 10 is a schematic diagram showing the outline of the optical current measuring device according to the fifth embodiment. This FIG.
In the fifth embodiment, as shown in FIG.
Except for the above configuration, the configuration is basically the same as that of the first embodiment.

FIG. 11 shows the sensor section 4 of the fifth embodiment.
It is sectional drawing which shows the concrete structure of 0 periphery. As shown in FIG. 11, at the mounting portion of the insulating spacer 12, the tank flange 11 at the end of one tubular tank 1a
The flange-shaped sensor portion 40 is disposed between the end surface a and the end surface of the outer peripheral portion of the insulating spacer 12 including the metal flange portion 32.

The sensor section 40 is composed of an annular insulating member 41 and an annular metal member 42 surrounding the outer periphery thereof. Here, the inner diameter of the annular metal member 42 is equal to the annular insulating member 4
The center portion of the end surface of the annular metal member 42 on the tank flange 11a side is counter bored, and the annular insulating member 41 is disposed in this counterbore portion. The portion of the annular metal member 42 on the side of the insulating spacer 12 left by the counterboring is the insulating spacer 1
A metal wall 43 is formed between 2 and the annular metal member 42.

The sensor fiber 19 is attached to the outer peripheral surface of the annular insulating member 41 in the spot facing portion of the annular metal member 42. This sensor fiber 19
Are arranged spirally around the conductor 2 as shown in FIG. Further, as shown in FIG. 11, this sensor fiber 19 is separated by a partition plate 34.
While being supported under the condition of free support on the outer periphery in the fiber arrangement space 44 having a size significantly larger than the fiber diameter, the partition plate 34 separates a plurality of turns.

A pocket portion having a coupling optical box installation space 45 protruding in the radial direction is provided in a part of the outer peripheral portion of the sensor fiber 19 in the annular metal member 42. The coupling optical box 20 is housed in the coupling optical box arrangement space 45 and is fixed to the metal wall 43 of the annular metal member 42. In this case, a fiber end installation space 46 is provided between the coupling optical box installation space 45 and the sensor fiber 19.
Is formed, and the end portion of the sensor fiber 19 is arranged in the fiber end portion arrangement space 46. Further, the outer periphery of the tank flange 1a on the opposite side of the metal wall 43 of the pocket portion having the joint optical box arrangement space 45 is opened, and the joint optical box arrangement space 45 is sealed in this opening portion. A lid 47 is provided.

In this way, the flange-shaped sensor portion 40, in which the sensor fiber 19 and the coupling optical box 20 are disposed between the annular insulating member 41 and the annular metal member 42, together with the insulating spacer 12, the bolt 35. And watertight washer 48
It is fixed to the tank flanges 11a and 11b on both sides. In addition, in the fifth embodiment, the O-rings 36 for ensuring the airtightness of the joint portion are provided on both surfaces of the outer peripheral portion of the insulating member 31 of the insulating spacer 12 and the annular insulating member 41. It is arranged on both sides. That is, by these O-rings 36, between the tank flange 11 a and the annular insulating member 41, between the annular insulating member 41 and the metal wall 43 of the annular metal member 42, and between the metal wall 43 of the annular metal member 42 and the insulating spacer 12. Airtightness is ensured between the insulating members 31 and at each joint surface between the insulating member 31 of the insulating spacer 12 and the tank flange 11b. Furthermore, counterbore processing is performed on both sides of the outer peripheral portion of the annular metal member 42,
Watertight rubber packings 49 are respectively provided in the counterbore portions. A watertight rubber packing 49 is also arranged around the lid 47.

[5-2. Action / Effect] According to the optical current measuring device of the fifth embodiment having the above configuration, the following action / effect can be obtained.

Improvement of measurement accuracy by the structure of the sensor unit 40 First, as in the first embodiment, the sensor unit 40 using the sensor fiber 19 is arranged at the joint between the tank flanges 11a and 11b. , It is not necessary to propagate the measurement beam in the heated gas in the tank, and the total spatial propagation distance of the measurement beam is shortened. Therefore, it is possible to avoid a change in the optical axis of the optical system due to a change in temperature, and it is possible to measure current with high accuracy.

Further, similarly to the first embodiment, since the sensor fiber 19 is supported in the fiber arrangement space having a dimension larger than the fiber diameter under the condition of free support of the outer circumference, the fiber due to vibration or temperature change is The effect on the birefringence can be avoided, and from this point also, highly accurate current measurement can be performed.

Furthermore, an annular insulating member 41 inserted so as to separate the tank flange 11a and the insulating spacer 12 from each other.
Since the sensor fiber 19 is attached to the outer periphery of the sensor fiber, there is no current-carrying portion in the loop formed by the sensor fiber 19. Therefore, similar to the first embodiment, the structure is such that the return current and the sheath current do not flow in the loop inner portion of the sensor fiber 19. Therefore, since the current flowing in the loop formed by the sensor fiber 19 is only the measured current flowing in the conductor 2, it is possible to measure the current with high accuracy according to Ampere's law.

Light source / detector unit 1 for sensor unit 40
Improvement of measurement accuracy by remote placement of 4 and fiber connection As in the first embodiment, since the light source / detector unit 14 is placed at a position distant from the sensor unit 40, the light source 15 that is weak against environmental changes Further, the detector 16 can be arranged so as to avoid an area where temperature changes, vibrations, and electrical noise are severe. Further, between the sensor unit 40 and the light source / detector unit 14, the light transmitting fiber 8 and the light receiving fibers 9a and 9b are provided.
Since they are connected with each other, external influences on the transmission beam can be avoided, and electrical insulation is facilitated.
Therefore, highly accurate current measurement is possible.

The structure of the sensor section 40 makes the apparatus compact, facilitates assembly, and improves reliability of optical parts. The sensor fiber 19 and the coupling optical box 20 are connected to the annular insulating member 4.
1 and the annular metal member 42 to form a sensor portion 40, and the sensor portion 40 is attached so as to be sandwiched between the insulating spacer 12 and the tank flange 11a of the tubular tank 1a. It is possible to configure a compact optical current measuring device without increasing the size of the entire insulated closed tank 1 as compared with the case where 40 is not incorporated.

Further, since the sensor fiber 19 is arranged in a spiral shape and the turns are separated by the partition plate 34, it is possible to easily arrange a plurality of turns of fiber, and the adjacent fibers are adjacent to each other. It is possible to improve the reliability of the sensor fiber 19 by avoiding the unfavorable mechanical interference between the turns.

On the other hand, when the insulating members are joined together,
Even if the O-ring 36 is provided, there is a possibility that sufficient airtightness may not be obtained. However, in FIG. 11, each of the joint surfaces provided with the O-ring 36 has a metal member and an insulating member. Since they are joined via the O-ring 36, high airtightness can be secured. In particular, the insulating member 3 of the annular insulating member 41 and the insulating spacer 12
A metal wall 43 of the annular metal member 42 is inserted between the metal wall 43 and the metal member 1. However, in addition to ensuring the airtightness as described above, the metal wall 43 also has a metal flange portion 32 of the insulating spacer 12.
It is also effective in terms of electrical connection with.

Further, a rubber packing 49 is provided at the joint between the annular metal member 42 on the outer peripheral side of the sensor unit 40 and another member, and the bolts for fixing the tank flanges 11a and 11b are also watertight. Since the washer 48 is provided, a watertight structure sufficient to prevent water from entering the inside of the sensor unit 40 can be obtained. Therefore, it is possible to improve the reliability of the sensor fiber 19 and the optical components of the coupling optical box 20 that do not like water.

Realization of adaptability to a multipoint grounding system by using the annular metal member 42. In the fifth embodiment, the annular metal member 42 allows the tubular tank 1a, through the metal flange portion 32 of the insulating spacer 12, The 1b can be electrically connected. Therefore, unlike the third embodiment, it is possible to apply to a gas-insulated switchgear of a multipoint grounding system without the need to use the conductive cover 37 or the shunt bar 38 specially.

[5-3. Modification] As a modification of the fifth embodiment, for example, a plurality of 1-turn sensor fibers 19 constituting a plurality of sensors are arranged in layers in the axial direction, and a partition plate is provided between adjacent fibers. A similar configuration is also conceivable via 34. In this case, the number of the coupling optical box 20 or the number of optical components inside the coupling optical box 20 increases according to the number of sensors, but the basic configuration is exactly the same as the configuration shown in FIG.

[6. [Sixth Embodiment] FIG. 12 shows a sixth embodiment according to the present invention.
One form when each invention of 13, 14, and 24 is implemented is shown. Specifically, this sixth embodiment is
In the configuration of the fifth embodiment shown in FIGS. 10 and 11, each of a plurality of turns of the sensor fiber 19 is individually used instead of using the partition plate 34 as the fiber supporting means for supporting the sensor fiber 19. It is a modification using a support seat 50 having a plurality of holes for supporting the. The support seats 50 are arranged at a plurality of locations on the outer circumference of the annular insulating member 41.

In the sixth embodiment, a plurality of turns of the sensor fiber 19 can be easily separated by the support seat 50 having a simpler structure than the partition plate 34, and entanglement between adjacent turns. It is possible to avoid inconvenient mechanical interference such as. Further, as a modified example of the sixth embodiment, for example, instead of using the support seat 50 having a plurality of holes, a support seat having a plurality of U-shaped grooves according to the invention of claim 15 is used. It is possible to do it. Also in this case, the same action and effect can be obtained.

[7. Seventh Embodiment] FIG. 13 shows a seventh embodiment according to the present invention.
33 shows one mode in which each invention described in 33 is implemented. Specifically, in the seventh embodiment, particularly in the case of using a plurality of sensor fibers 19 and a plurality of coupling optical boxes 20 among the configurations of the fifth embodiment shown in FIGS. 10 and 11. It shows one form relating to the arrangement of the coupling optical box 20. That is, as shown in FIG. 13, the annular metal member 42 has bolt holes 51 for allowing bolts 35 (FIG. 11) for fixing the tubular tanks 1a, 1b to the tank flanges 11a, 11b and studs to pass therethrough. It is arranged at intervals in the circumferential direction. For such a bolt hole 51, each of the plurality of coupling optical boxes 20 is arranged between two adjacent bolt holes 51. Also,
Each of the plurality of sensor fibers 19 connected to the plurality of coupling optical boxes 20 is arranged so that the bolt holes 51 are not located inside the loop formed by the sensor fibers 19. That is, the end of the sensor fiber 19 is
It is arranged between two adjacent bolt holes 51, respectively.

The seventh embodiment configured as described above is
It is suitable as an optical current measuring device for a gas-insulated switchgear of a multipoint grounding system. That is, the seventh embodiment is applied to a gas-insulated switchgear of a multipoint grounding system, and bolt holes 51
Even when a sheath current is passed through a metal member such as a bolt or a stud penetrating through, the current flowing in the loop formed by the sensor fiber 19 is only the current to be measured flowing through the conductor 2, so that highly accurate current measurement is possible. It is possible.

Further, as a modification of the seventh embodiment, for example, even when one coupling optical box 20 is used, two bolt holes 51 adjacent to the coupling optical box 20 are provided.
It is conceivable to arrange it between the two. Again, in this case,
Similar functions and effects can be obtained.

[8. Eighth Embodiment] FIG. 14 shows an eighth embodiment according to the present invention, which is defined by claims 24, 34, and
It shows one mode when each invention described in 35 and 37 is implemented. Specifically, this eighth embodiment is similar to FIG.
0, in the configuration of the fifth embodiment shown in FIG. 11, a sensor unit (annular structure) 40 is provided between the annular metal member 42 and the tank flange 11a of the tubular tank 1a. It is a modification in which a temporary fixing structure that can be attached to the flange 11a is provided. That is, as shown in FIG. 14, in the annular metal member 42, the bolt holes 51 are arranged at intervals in the circumferential direction as described above, but at a plurality of positions between the plurality of bolt holes 51, A countersunk hole 52 is provided. Further, the tank flange 11a of the tubular tank 1a is provided with screw holes 53 at a plurality of positions corresponding to the counterbored holes 52. Then, together with a temporary fixing screw 54 corresponding to the screw hole 53, a temporary fixing structure capable of temporarily fixing the sensor unit 40 to the tank flange 11a is configured.

According to the eighth embodiment thus constructed, the insulating hermetically sealed tank 1 can be easily assembled by the same assembly process as in the case where only the insulating spacer is attached and the sensor section 40 is not attached. it can. That is, when the sensor part 40 is not attached and only the insulating spacer is attached, the insulating spacer is attached to one of the tank flanges and then the other tank flange is connected. In general, the metal flange portion of the insulating spacer is provided with a bolt hole for fixing, and thus the insulating spacer can be easily attached to the tank flange by this method to easily assemble the insulating closed tank 1. it can.

However, when the insulating spacer and the flange-shaped sensor portion 40 coexist, the above assembling method cannot be applied as it is. On the other hand, in the eighth embodiment, a counterbored hole 52, a screw hole 53, and a temporary fixing screw 54 are provided between the annular metal member 42 of the sensor unit 40 and the tank flange 1a. Since the temporary fixing structure is provided, the insulated closed tank 1 can be easily assembled by the normal assembly method as described above in a state where the sensor portion 40 is attached to the tank flange 1a in advance. Further, since the sensor unit 40 can be temporarily fixed to the tank flange 1a at the time of factory shipment,
There is also an advantage that the work on site can be reduced.

As a modified example of the eighth embodiment, for example, a countersunk hole 52 in the annular metal member 42.
37. Instead of providing the screw holes 53 in the tank flange 1a, the annular metal member 42 according to the invention of claim 36.
It is conceivable that a screw hole is provided in the tank flange, and a counterbored hole is provided in the tank flange 1a. Also in this case, the same action and effect can be obtained.

[9. [Ninth Embodiment] FIG. 15 shows a ninth embodiment of the present invention in which the inventions of claims 37 and 38 are carried out. Specifically, in the ninth embodiment, the sensor unit 13 of the fourth embodiment is replaced by the sensor unit 40 of the fifth embodiment, which includes an annular insulating member 41 and an annular metal member 42.
This is a modified example in which That is, in the ninth embodiment, when the insulating spacer 12 is directly connected to the tank flange 11b of the gas circuit breaker 39, the sensor unit 40 is used.
Is attached to the tank flange 11a of the tubular tank 1a of another device. In the ninth embodiment configured in this way, as in the fourth embodiment, in particular,
When performing maintenance on the sensor fiber 19 of the sensor unit 40, it is not necessary to disassemble the gas circuit breaker 39, and maintenance is excellent.

[10. Tenth Embodiment] FIG.
As a tenth embodiment of the present invention, one mode in which the invention according to claim 39 is carried out is shown. That is, as shown in FIG. 16, the sensor unit 40 of the present invention
Is the tank flange 11 without the insulating spacer 12.
It is also possible to connect directly between a and 11b. In this case, the annular insulating member 41 of the sensor unit 40 is sandwiched between the tank flanges, which are metal members, and therefore the fifth insulating member 41 is formed.
As in the embodiment of FIG.
It is not necessary to provide. As a result, in FIG. 16, between the tank flanges 11a and 11b, the annular insulating member 41,
A sensor unit 40 having a very simple structure is provided, which is composed of a simple annular metal member 42 without the metal wall 43, the sensor fiber 19 and its partition plate 34, and O-rings 36 on both surfaces of the annular insulating member 41. According to the tenth embodiment, the sensor unit 40 can be arranged at an arbitrary tank-to-tank flange joint portion in the gas-insulated switchgear regardless of the presence or absence of the insulating spacer, and the degree of freedom in design is increased. There is.

[11. Other Embodiments] The present invention is not limited to the above-described embodiments, and various other modified examples can be implemented. For example, it is possible to appropriately combine or replace the plurality of embodiments described above, the number of sensor fibers and the number of turns, the specific configuration of the annular insulating member or the annular metal member, the specific of the fiber support means. The configuration can be changed freely. Further, the specific structure of the fixing structure between members, the watertight structure, the temporary fixing structure, etc. can be freely changed. Furthermore, according to the invention of claim 3, it is possible to dispose a cushioning material such as cotton or gel-like resin in the fiber disposition space. In this case, the influence of mechanical force applied to the sensor fiber is reduced, The measurement accuracy can be further improved.

[0110]

As described above, in the present invention, the annular insulating member is arranged at the flange joint portion of the tubular tank, and the fiber arranging space is formed inside and outside the annular insulating member. By arranging the optical fiber in the space in a wound state, it is possible to provide an optical current measuring device which can measure the current with high accuracy even in an environment where vibration or temperature change is large and which can be made compact.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an outline of an optical current measuring device according to a first embodiment of the present invention.

2 is an exemplary solution diagram showing the optical system of FIG. 1. FIG.

3 is a cross-sectional view showing a specific structure around the sensor unit of FIG.

FIG. 4 is an illustrative view showing an arrangement form of the sensor fibers of FIG.

FIG. 5 is a diagram showing a second embodiment according to the present invention, and in particular, is an illustrative view showing a form of arrangement of sensor fibers.

FIG. 6 shows a second embodiment of the present invention, in particular
It is a figure showing a case where a plurality of sensor fibers are arranged spirally, (A) is an example solution figure showing the form attached to the outer peripheral surface of an annular insulating member, (B) is a form molded in the annular insulating member FIG.

FIG. 7 is a second embodiment according to the present invention, in particular,
It is a figure showing the case where a plurality of sensor fibers are arranged in the shape of a spiral, (A) is an example solution figure showing the form attached to the end face of the annular insulating member, and (B) shows the form molded in the annular insulating member. FIG.

FIG. 8 is a cross-sectional view showing a specific structure around a sensor unit in the optical current measuring device according to the third embodiment of the present invention.

FIG. 9 is a diagram showing an optical current measuring device according to a fourth embodiment of the present invention, and in particular, a configuration diagram showing an outline of a structure around a sensor unit.

FIG. 10 is a configuration diagram showing an outline of an optical current measuring device according to a fifth embodiment of the present invention.

11 is a cross-sectional view showing a specific structure around the sensor unit of FIG.

FIG. 12 is an illustrative view showing an outline of a support structure of a sensor fiber in an optical current measuring device according to a sixth embodiment of the present invention.

FIG. 13 is a sectional view showing the arrangement configuration of a sensor fiber and a coupling optical box in the optical current measuring device according to the seventh embodiment of the present invention.

FIG. 14 is a sectional view showing, in particular, a temporary fixing structure in an optical current measuring device according to an eighth embodiment of the present invention.

FIG. 15 is a configuration diagram showing an outline of a structure around a sensor unit in an optical current measuring device according to a ninth embodiment of the present invention.

FIG. 16 is a cross-sectional view showing a specific structure around a sensor unit in an optical current measuring device according to a tenth embodiment of the present invention.

FIG. 17 is a configuration diagram showing an optical system of a conventional optical current measuring device.

[Explanation of symbols]

 1: Insulated closed tank 1a, 1b: Tubular tank 2: Conductor 8: Fiber for light transmission 9, 9a, 9b: Fiber for light reception 11a, 11b: Tank flange 12: Insulation spacer 13: Sensor section 14: Light source / detector section 15: Light source 16: Detector 17: Signal processing circuit 18: Output terminal 19: Sensor fiber 20: Coupling optical box 21: Reflective material 22a-22d: Lens 23a: Polarizer 22b, 23c: Analyzer 24a, 24b: Beam splitter 25: Holder 31: Insulation member 32: Metal flange part 33: Annular insulation member 34: Partition plate 35: Bolt 36: O-ring 37: Conductive cover 38: Shunt bar 39: Gas circuit breaker 40: Sensor part 41: Annular insulation Member 42: Annular metal member 43: Metal wall 44: Fiber installation space 45: Coupling optical box installation space 46: Fiber Driver end disposing space 47: Lid 48: watertight washer 49: rubber packing 50: support seat 51: bolt hole 52: counterbore-Kiri hole 53: screw hole 54: Screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Uenishi 2-1, Ukishimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Hamakawasaki factory

Claims (39)

[Claims] 1. A sealed tank formed by joining a plurality of tubular tanks to each other via flanges provided at the ends of the tanks is filled with an insulating gas, and a conducting conductor is arranged in the axial direction of the sealed tank. Installed, the energizing current of the energizing conductor of the gas-insulated device, which selectively attaches an insulating spacer that spatially separates the tubular tank to the flange of the tubular tank, based on the polarization state associated with the Faraday effect of light. In an optical current measuring device for measuring, an annular insulating member disposed between one of the flanges of the tubular tank and a flange of another tubular tank joined to this flange, the annular insulating member and its outer periphery. An optical fiber arranged in a wound state in a fiber arrangement space formed in a part of a range including a space and attached to the annular insulating member, and the optical fiber is optically An optical current measuring device comprising: an optical device that is coupled and that allows light for measurement to enter the optical fiber and emits light that has passed through the optical fiber to the outside. 2. The fiber arranging space has a size larger than the fiber diameter of the optical fiber, and the optical fiber is arranged in the fiber arranging space under free outer circumference support conditions. The optical current measuring device according to claim 1. 3. The optical current measuring device according to claim 2, wherein a cushioning material is arranged around the optical fiber in the fiber arrangement space. 4. The optical current measuring device according to claim 1, wherein the optical fiber is arranged in a spiral shape. 5. The optical fibers are a plurality of optical fibers constituting a plurality of sensors, the plurality of optical fibers are arranged in layers in a radial direction of the annular insulating member, and the plurality of optical fibers are arranged. The optical current measuring device according to claim 4, wherein each of the optical fibers is arranged in a spiral shape. 6. The optical current measuring device according to claim 1, wherein the optical fiber is arranged in a spiral shape. 7. The optical fibers are a plurality of optical fibers forming a plurality of sensors, the plurality of optical fibers are arranged in layers in the axial direction of the annular insulating member, and the plurality of optical fibers are arranged in layers. The optical current measuring device according to claim 6, wherein each of the optical fibers is arranged in a spiral shape. 8. The fiber supporting means for forming the fiber arrangement space and supporting the optical fiber in the fiber arrangement space is arranged. An optical current measuring device described in one. 9. The optical fiber is wound with a plurality of turns, and the fiber supporting means forms a plurality of the fiber arranging spaces, and the optical fibers are arranged in the plurality of fiber arranging spaces. 9. The structure according to claim 8, wherein each turn is individually supported and adjacent turns are separated from each other.
The optical current measuring device described. 10. The optical fibers are a plurality of optical fibers forming a plurality of sensors, and the fiber supporting means forms a plurality of the fiber arrangement spaces, and the fiber arrangement spaces are provided in the plurality of fiber arrangement spaces. 9. The optical current measuring device according to claim 8, wherein each of the plurality of optical fibers is individually supported and adjacent optical fibers are separated from each other. 11. The optical fiber is a plurality of optical fibers constituting a plurality of sensors, and each of the plurality of optical fibers is wound with a plurality of turns, and the fiber supporting means has a plurality of layers. A plurality of the fiber arrangement spaces are formed, and each of the plurality of optical fibers is individually supported for each turn in the plurality of layers of the fiber arrangement spaces, and between adjacent optical fibers and adjacent to each other. 9. The optical current measuring device according to claim 8, wherein the turns are separated from each other. 12. The optical current measuring device according to claim 8, wherein the fiber supporting means is a partition plate that separates adjacent optical fibers from each other. 13. The optical system according to claim 8, wherein the fiber support means is a support seat provided at a plurality of locations on the outer circumference of the annular insulating member. Current measuring device. 14. The optical current measuring device according to claim 13, wherein the support seat has a plurality of holes for individually supporting the optical fibers. 15. The optical current measuring device according to claim 13, wherein the support seat has a plurality of U-shaped groove portions for individually supporting the optical fibers. 16. The optical current measuring device according to claim 1, wherein the optical fiber is molded in the annular insulating member. 17. The optical current measuring device according to claim 16, wherein the optical fiber is molded in the annular insulating member via a partition plate forming the fiber disposition space. 18. The optical current measuring device according to claim 16, wherein the optical device is molded in the annular insulating member together with the optical fiber. 19. The connecting member for electrically connecting the flanges of the tubular tanks on both sides of the annular insulating member is disposed on the outer periphery of the annular insulating member.
An optical current measuring device according to claim 18. 20. The optical current measuring device according to claim 19, wherein the connecting member is a conductive cover. 21. The optical current measuring device according to claim 19, wherein the connecting member is a shunt bar. 22. When the insulating spacer is attached to the flange of the tubular tank, the annular insulating member is arranged between the flange of another tubular tank joined to the flange and the insulating spacer. 22. The optical current measuring device according to claim 1, wherein: 23. The annular insulating member is attached to a flange of another device attached to the gas circuit breaker when the insulating spacer is directly connected to the flange of the gas circuit breaker. 22. The optical current measuring device according to 22. 24. Surrounding the outer periphery of the annular insulating member,
The optical current measurement device according to any one of claims 1 to 15, wherein an annular metal member that forms the fiber installation space is provided between the annular insulating member and the outer peripheral surface of the annular insulating member. apparatus. 25. The optical current measuring device according to claim 24, wherein the annular metal member is arranged so as to electrically connect the flanges on both sides thereof. 26. When the insulating spacer is attached to the flange of the tubular tank, and the insulating spacer has an insulating member and a metal flange portion around the insulating member, the annular metal member is joined to the flange of the tubular tank. 26. The optical current measuring device according to claim 25, wherein the optical current measuring device is arranged so as to electrically connect a flange of another tubular tank to the metal flange portion of the insulating spacer. 27. The annular metal member is configured to form an optical device installation space in a part of an outer periphery of the fiber installation space, and the optical device is installed in the optical device installation space. Is
27. The optical current measuring device according to claim 24, wherein the optical current measuring device is supported by the annular metal member. 28. The optical system according to claim 27, wherein the annular metal member has a watertight structure capable of ensuring watertightness of the fiber installation space and the optical device installation space therein. Current measuring device. 29. The optical current measuring device according to claim 28, wherein the watertight structure includes watertight means arranged between the annular metal member and the flange of the tubular tank. 30. When the insulating spacer is attached to the flange of the tubular tank, the watertight structure includes watertight means arranged between the annular metal member and the insulating spacer. 29. The optical current measuring device according to claim 28. 31. The optical current measuring device according to claim 29 or 30, wherein the watertight means is an elastic member. 32. The optical current measuring device according to claim 29, wherein the watertight means is an adhesive. 33. The annular metal member has a plurality of bolt holes for mounting the flange of the tubular tank, the optical device is disposed between two adjacent bolt holes, and the optical fiber is provided. 33. The optical current measuring device according to any one of claims 24 to 32, characterized in that the bolt hole is not located inside the loop formed by the optical fiber. 34. The annular metal member is integrally fixed to the annular insulating member to form an annular structure, and the annular metal member and the flange of the tubular tank are provided with the annular metal member. 34. The optical current measuring device according to claim 24, further comprising a temporary fixing structure capable of attaching the structure to the flange of the tubular tank. 35. The annular metal member has a plurality of bolt holes for mounting the flange of the tubular tank, and the temporary fixing structure has a plurality of counterbores provided between two adjacent bolt holes. With a drill hole, and a plurality of screw holes provided at positions corresponding to the counterbored hole of the flange of the tubular tank, via a temporary fixing screw corresponding to the screw hole, the The optical current measuring device according to claim 34, wherein the annular structure is configured to be attachable to the flange of the tubular tank. 36. The annular metal member has a plurality of bolt holes for mounting the flange of the tubular tank, and the temporary fixing structure has a plurality of screws provided between two adjacent bolt holes. A hole and a plurality of counterbored holes provided at positions corresponding to the screw holes of the flange of the tubular tank, and the annular structure via a temporary fixing screw corresponding to the screw holes. The optical current measuring device according to claim 34, wherein the body is configured to be attachable to the flange of the tubular tank. 37. When the insulating spacer is attached to the flange of the tubular tank, the annular insulating member and the annular metal member are joined to the flange of another tubular tank joined to the flange and the insulating spacer. The optical current measuring device according to any one of claims 24 to 36, wherein the optical current measuring device is arranged between them. 38. When the insulating spacer is directly connected to a flange of a gas circuit breaker, the annular insulating member and the annular metal member are attached to a flange of another device attached to the gas circuit breaker. 38. The optical current measuring device according to claim 37, which is characterized in that. 39. The annular insulating member and the annular metal member are disposed between one of the flanges of the tubular tank and a flange of another tubular tank joined to the flange, and the insulating spacer. 25. It is directly connected to the flanges on both sides of the flange without passing through.
37. The optical current measuring device according to claim 36.