TWI432739B - Optical converter for electronic equipment - Google Patents

Description

Optical converter for electronic equipment

The present invention relates to an optical converter for an electronic device, and more particularly to an optical converter for an electronic device which can improve the measurement accuracy of current.

Generally, an electronic device such as a gas insulated switchgear, a gas circuit breaker, or a gas insulated main bus is used as a power transmission and distribution device. In these electronic machines, in order to measure the current flowing through the energized conductor disposed in the sealed container, a scheme using an optical converter has been proposed.

In general, optical converters use conventional lead glass fibers as current sensors. In the case of the reflective optical converter, as shown in FIGS. 9(a) and 9(b), when the current-carrying conductor 1 through which the current flows is disposed in a container (not shown) in which a cylindrical electronic device is formed The optical fiber 2 is wound around the current-carrying conductor 1 so that the current-carrying conductor 1 and the optical fiber 2 are perpendicular (intersecting).

An optical element 3 having a permanent magnet is disposed at one end of the optical fiber 2, and a reflective element 4 is disposed at the other end. The optical element 3 and the reflective element 4 are disposed on a winding circle of the optical fiber 2, that is, The winding of the optical fiber 2 wound around the axis of the current-carrying conductor 1 is perpendicular (intersecting). As a result, for example, as shown in FIGS. 9( a ) and 9 ( b ), when the current I flows upward from the lower side of the current-carrying conductor 1 , a magnetic field H generated in a direction perpendicular to the current I is added to the optical fiber 2 .

In the reflective optical converter, linear light is transmitted from the light-emitting portion (not shown) through the optical element 3 on one end side of the optical fiber 2, and is reflected and folded back by the reflective element 4 on the other end side of the optical fiber 2. A measuring unit (not shown) that is externally installed. Since the incoming linearly polarized light system is an outgoing light beam that is rotated by the Faraday effect of the optical fiber, the measuring unit calculates the rotation angle of the outgoing light beam and measures the energization current.

In the case where the optical converter is used in combination with an electronic device, in order to arrange an optical fiber wound around an electric conductor, the end surface for the axial direction has a surrounding groove. The scheme of the ring frame.

In the optical converter described in Patent Document 1, the optical fiber is housed and fixed in a ring groove of the annular frame to intersect the current-carrying conductor, and a polarizing extending in the surrounding direction is disposed at both end portions of the optical fiber surrounding the groove. Piece and analyzer. Due to the structure in which the optical converter is formed, the fiber length is shortened compared to the outer peripheral surface of the annular frame, and the optical transmission loss can be reduced.

Further, in Japanese Laid-Open Patent Publication No. 2000-121676 (Patent Document 2), a high-precision converter has been proposed in which an optical fiber wound around an electric conductor is surrounded by a positive integer circle, and even if the surrounding radius of the optical fiber is small, the elimination is also caused. The influence of the magnetic field generated by the current flowing through the current conducting conductor does not cause measurement errors.

In the optical converter described in Patent Document 2, the winding end portion of the optical fiber is bent outward, and when the input end of the polarizing plate is disposed and the output end of the analyzer is disposed, the position from the surrounding end to the input end and By covering with the magnetic cover, the output end can prevent the influence of the magnetic field and form high precision without measurement error.

In the optical converter described in FIG. 9 and the optical converter described in Patent Document 1, an optical element or the like is disposed on a winding circle of an optical fiber that is perpendicular (intersected) to the axial direction of the current-carrying conductor 1, that is, The optical element 3 and the reflective element 4 are arranged on the winding extension line of the optical fiber perpendicular to the axial direction of the current-carrying conductor 1, and form the same direction with respect to the direction of the magnetic field H generated by the current I.

In such an optical converter, the influence of the magnetic field generated by the current flowing through the current-carrying conductor increases the influence on the permanent magnet in the optical element, which is a cause of measurement error. That is, it is for the following reasons. The permanent magnetic system in the optical element is due to the effect of its magnetic field

The angle of the linearly polarized wave is saturated and used as an optical signal. When a current flows through the current-carrying conductor, a magnetic field is generated. However, when the magnetic field of the permanent magnet in the optical element matches the direction of the magnetic field generated by the current flowing through the current-carrying conductor, the linearly-polarized light is saturated even if a magnetic field is further added from the outside. Not affected. However, when the direction of the magnetic field of the permanent magnet is opposite to the direction of the magnetic field H generated by the current I flowing through the current-carrying conductor 1, the magnetic field generated by the permanent magnet (the magnetic field generated by the permanent magnet) - the magnetic field generated by the current flowing through the current-carrying conductor When the linearly polarized wave is not saturated, the current measuring device is calculated on the premise that the magnetic field of the permanent magnet in the optical element 3 is saturated, which is a cause of the error.

Further, as in the optical converter of Patent Document 2, when the winding end portion of the optical fiber is placed at the input end of the polarizer and the output end of the analyzer is placed and covered with a magnetic cover to eliminate the influence of the magnetic field, The winding end of the optical fiber is complicated in construction and makes it difficult to manufacture.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical converter for an electronic device which can reduce the influence of a magnetic field and improve the measurement accuracy of a current flowing through an energized conductor by a simple configuration.

[Patent Document 1] Japanese Patent Laid-Open No. 2000-314751

[Patent Document 2] Japanese Patent Laid-Open No. 2000-121676

The optical converter for an electronic device according to the present invention is configured to include at least an electric conductor disposed in a container of the electronic device, an optical fiber that is wound so as to be perpendicular to an axial direction of the current conducting conductor, and one end of the optical fiber. An optical element having a permanent magnet and a reflective element disposed at the other end, at least the optical element being disposed in an arbitrary imaginary plane of the permanent magnet through a central axis of the current conducting conductor.

Preferably, both the optical element and the reflective element are disposed on the same axis. Further preferably, the optical element and the reflective element are disposed in close proximity to each other and in the same position.

Further, the optical converter for an electronic device according to the present invention is configured to include at least an electric conductor disposed in a container of the electronic device, and an optical fiber that is wound so as to be perpendicular to an axial direction of the current conducting conductor, and one end of the optical fiber The optical element having the permanent magnet and the reflective element disposed at the other end, the flange formed on the outer surface of the container is combined with at least two frame units, and is detachably detachable Fixing the annular frame having the groove and the accommodating seat, arranging the optical fiber in the groove of the annular frame, and arranging the optical element and the reflective element in close proximity in the housing of the annular frame; The optical element is disposed in an arbitrary imaginary plane of the permanent magnet whose magnetic field axis is located through a central axis of the energization conductor.

Preferably, the housing of the annular frame is formed by inclining the axial direction of the current-carrying conductor.

According to the optical power converter for an electronic device according to the present invention, when the optical fiber is wound around the current conducting conductor, the permanent magnet in the optical element disposed at the end of the optical fiber is disposed on the shaft passing through the conducting conductor. In the virtual plane created, the magnetic field of the permanent magnet is significantly less affected by the magnetic field generated by the current flowing through the current conducting conductor. Therefore, the optical converter for an electronic device of the present invention can improve the measurement accuracy of current more than a conventional optical converter by a simple configuration.

In the optical converter for an electronic device according to the present invention, the optical converter for an electronic device of the present invention is provided with a current-carrying conductor in a container of the electronic device, and the optical fiber is wound around the axial direction of the current-carrying conductor. One end is provided with an optical element having a permanent magnet, and the other end is provided with a reflective element. The optical component is configured such that the magnetic field axis of the permanent magnet is located in any imaginary plane passing through the central axis of the energization conductor.

[Example 1]

Hereinafter, the optical converter for an electronic device according to the present invention will be described in order with the same reference numerals as in the prior art, with reference to FIGS. 1 through 8. As shown in Fig. 1 (a) and Fig. 1 (b), the current-carrying conductor 1 through which a current flows is disposed inside a container (not shown) in which a cylindrical electronic device is formed, and is sealed with an insulating gas. Here, the current-carrying conductor 1 is wound around the optical fiber 2 at least once in a manner to surround it.

Both ends of the optical fiber 2 that is wound and arranged are bent in the same direction as the longitudinal direction (axial direction) of the current-carrying conductor, and optically disposed at one end of the optical fiber 2 on which the linearly polarized light is incident, as in the prior art The element 3 is further provided with a reflective element 4 at the other end of the optical fiber 2. The optical element 3 is connected to a measuring unit for measuring light source and current disposed outside. Further, both of the optical element 3 and the reflection element 4 are disposed on the same axis indicated by a chain line in FIG. 1(a), and are formed in the same direction as the axial direction of the current-carrying conductor 1.

As shown in Fig. 3 (a), the optical element 3 provided at one end of the optical fiber 2 has a permanent magnet 3A and a birefringent element 3B which are used in a saturated state to generate a magnetic field H, and are disposed on the side where the linearly polarized light enters. The end face of the optical fiber 2 is used. Further, as shown in FIG. 3(b), the reflective element 4 provided at the other end of the optical fiber 2 is configured to have a mirror surface 4A for reflecting linearly polarized light and returning it to the inside of the optical fiber 2.

However, according to the present invention, the optical element 3 and the reflection element 4 are disposed in any imaginary plane that passes through the central axis of the current-carrying conductor 1. Thereby, the magnetic field axis of the permanent magnet 3A of the optical element 3 is located in any imaginary plane passing through the central axis of the current conducting conductor 1. In other words, in the optical converter for an electronic device of Fig. 1(a), the axial direction of the current conducting conductor 1 through which the current I flows and the magnetic field H is generated is arranged in parallel with the optical element 3 and the reflecting element 4, and these lines are formed with the optical fiber. The state of the partial winding of the winding circle of 2.

In addition, any imaginary plane passing through the central axis of the current-carrying conductor 1 means that when a plane is formed on the side of all the outer peripheral surfaces of the current-carrying conductor 1 through the central axis of the current-carrying conductor 1, the plural One of the planes in the plane.

As a result, in the optical converter for an electronic device according to the present invention, the magnetic field H generated by the current I flowing through the current-carrying conductor 1 is applied to the linearly polarized light passing through the optical fiber 2, and the rotation can be changed in accordance with the intensity of the magnetic field H. Angle size. However, the optical element 3 at the end of the optical fiber 2 is such that the magnetic field axis of the permanent magnet 3A is located in any imaginary plane passing through the central axis of the energization conductor 1, so that the optical element 3 and the reflection element 4 are constructed with a simple configuration. That is, it becomes difficult to receive the influence of the magnetic field H generated by the current I flowing through the current-carrying conductor 1. Therefore, the measurement accuracy of the current measured by the measuring portion can be further improved as compared with the conventional one.

[Embodiment 2]

In the optical converter for an electronic device shown in Figs. 2(a) and 2(b) of another embodiment of the present invention, the optical fiber 2 is also wound in such a manner as to surround the current-carrying conductor 1 as in the above embodiment. The both ends are bent in the same direction as the axial direction of the energizing conductor 1.

The optical element 3 provided at one end of the optical fiber 2 and the reflective element 4 provided at the other end are disposed in proximity to each other, and the optical element 3 and the reflective element 4 are disposed to be energized. The magnetic field axis of the permanent magnet 3A included in the optical element 3 is located in an arbitrary imaginary plane passing through the central axis of the current conducting conductor 1 in an arbitrary imaginary plane of the central axis of the conductor 1. In other words, the axial direction of the energization conductor 1 is arranged in parallel with the axial direction of the optical element 3 and the reflection element 4, and the optical element 3 and the reflection element 4 are in a state of intersecting with the portion of the winding circle of the optical fiber 2.

Even if the optical converter for an electronic device in which the optical element 3 and the reflective element 4 are disposed as described above is hardly affected by the magnetic field H generated by the current I flowing through the current-carrying conductor 1, the same as the above example can be achieved. Effect.

In the circuit breaker 10 in which the operator of the disconnecting portion (not shown) inside the switching operation is provided on the side, the above-described examples of the optical converters for the respective electronic devices are used. The energizing conductor that connects the disconnecting portion of the gas circuit breaker 10 and the current I flows is disposed in the cylindrical containers 12A and 12B that are drawn upward.

The gas circuit breaker 10 is configured by arranging the optical fibers 2 on the outer surface of the container 12A, and arranging the optical element 3 and the reflecting element 4 shown in FIGS. 1(a) and 1(b) on the same axis. In the optical converter for an electronic device, the optical fiber 2 is wound around the outer surface of the containers 12A and 12B, and the optical element 3 and the reflective element 4 shown in Figs. 2(a) and 2(b) are arranged close to each other. Optical converters for electronic machines.

The specific structure of the optical converter for an electronic device shown in FIGS. 2(a) and 2(b) above is shown in FIG. 5(a), FIG. 5(b), FIG. 5(c) and FIG. . The container 20 of the electronic device in which the current-carrying conductor 1 is disposed is provided with a flange 20A on the outer surface, and the mounting metal member 24 is detachably mounted at a plurality of places of the flange 20A by a fixing method such as a screw 25 or the like. The frame 21 is formed.

In order to facilitate the production and mounting, the annular frame body 21 is formed by, for example, combining the frame units 21A and 21B which are formed into an arc shape by at least two divisions, and integrally formed by the joining method of the fastening screw 21C or the like. In the annular frame body 21, a groove 22 is formed around the container 2, and a portion of the groove 22 is formed into a flat storage seat 23 which is approximately parallel to the axial direction of the current-carrying conductor.

In the groove 22 provided in the annular frame 21, the optical fiber 2 wound around the current-carrying conductor 1 is placed and drawn to the outside of the measuring portion, and the optical element 3 and the reflecting element which are provided in the holder 23 to provide the respective ends of the optical fiber 2 are disposed. 4 Close to the configuration and install the protective cover 26. When the protective cover 26 is made of a material that can shield the magnetic field H, for example, a non-magnetic material, the optical element 3 and the reflective element 4 have an effect by preventing the influence of the magnetic field H generated by the current I flowing through the current-carrying conductor 1. Further, a lock plate can be attached to the groove 22 of the annular frame 21, and the optical fiber 2, the optical element 3, and the reflective element 4 can be covered by a lock plate.

As described above, when the optical fiber 2, the optical element 3, and the reflective element 4 are disposed by using the groove 22 and the accommodating seat 23 provided in the annular frame 21, the optical element 2, the optical element 3, and the reflective element 4 can be easily disposed at a desired position, and the optical element 3 can be easily disposed. The magnetic field axis of the permanent magnet 3A is located in any imaginary plane passing through the central axis of the energization conductor 1.

The accommodating seat 23 provided in a portion of the groove 22 of the annular frame 21 may be as shown in Figs. 7(a), 7(b), 7(c) and 8 It is provided to incline the axis of the energization conductor 1. In the portion of the slanted accommodating portion 23, the optical element 3 and the reflecting element 4 are arranged in close position and in the same position, and the other portions are the same as those in the examples of FIGS. 5(a), 5(b), 5(c) and 6. structure. Thereby, the optical element 3 and the reflective element 4 are disposed at an oblique angle to the axis of the current-carrying conductor 1, and the magnetic field axis of the permanent magnet in the optical element is located in an arbitrary imaginary plane passing through the central axis of the current-carrying conductor 1. The optical converter is used in electronic equipment, so the same effect can be achieved.

The inclination angle of the accommodation seat 23 of the annular frame 21 can be appropriately determined. However, when the inclination angle of the accommodation seat 23 is large, the diameter of the groove 22 for the arrangement of the optical element 3 and the reflection element 4 has to be As the size becomes larger, the overall size of the annular frame body 21 becomes large. Therefore, the accommodating seat 23 forms an inclination angle of, for example, ±5 degrees with respect to the axis of the current-carrying conductor 1, and even the arrangement of the optical element 3 and the reflection element 4 is facilitated, and the arrangement of the components parallel to the axial direction of the current-carrying conductor 1 is formed. And use.

Further, in the optical converter for an electronic device according to each of the above embodiments, an example in which both the optical element 3 and the reflective element 4 are disposed at the same position is described. However, only the optical element 3 may be disposed. It is used in any plane passing through the central axis of the energization conductor 1 and the magnetic field axis of the permanent magnet 3A provided in the optical element 3 is located there.

The optical converter for an electronic device according to the present invention is ideal for use in an electronic device that insulates a gas such as a gas circuit breaker or a gas insulated switchgear.

1‧‧‧Electric conductor

2‧‧‧Fiber

3‧‧‧Optical components

3A‧‧‧ permanent magnet

3B‧‧‧birefringent components

4‧‧‧reflecting elements

4A‧‧‧Mirror

10‧‧‧Circuit breaker

12A, 12B‧‧‧ containers

20‧‧‧ container

20A‧‧‧Flange

21‧‧‧Ring frame

21A, 21B‧‧‧frame units

21C‧‧‧Connection screw

22‧‧‧ slots

23‧‧‧ 收纳

24‧‧‧Installing metal parts

25‧‧‧ screws

26‧‧‧ protective cover

H‧‧‧ magnetic field

I‧‧‧current

Fig. 1 (a) is a schematic perspective view of an optical converter for an electronic device according to an embodiment of the present invention, and Fig. 1 (b) is a plan view of Fig. 1 (a).

Fig. 2 (a) is a schematic perspective view of an optical converter for an electronic device according to another embodiment of the present invention, and Fig. 2 (b) is a schematic plan view of Fig. 2 (a).

Fig. 3(a) is a schematic cross-sectional view showing an optical element used in the optical converter for an electronic device of Figs. 1 and 2, and Fig. 3(b) is used for the optical converter for an electronic device of Figs. 1 and 2. A schematic cross-sectional view of a reflective element.

Fig. 4 is a schematic configuration diagram of a gas circuit breaker to which an optical converter for an electronic device according to the present invention is applied.

Figure 5 (a) is a front elevational view showing a partial cross section of an optical converter for an electronic device to which the present invention is applied, and Figure 5 (b) is a plan view of Figure 5 (a) showing a partial cross-section, Figure 5 (c) The right side view of Figure 5(b) is shown in a partial section.

Fig. 6 is a perspective view showing the optical converter for an electronic device of Fig. 5;

Fig. 7 (a) is a front elevational view showing a partial cross section of an optical converter for an electronic device to which the present invention is applied, and Fig. 7 (b) is a plan view of Fig. 7 (a) showing a partial cross section, Fig. 7 (c) The right side view of Figure 7(b) is shown in a partial section.

Fig. 8 is a perspective view showing the optical converter for an electronic device of Fig. 7;

Fig. 9(a) is a schematic perspective view showing a conventional optical converter for an electronic device, and Fig. 9(b) is a plan view of Fig. 9(a).

1. . . Power conductor

2. . . optical fiber

3. . . Optical element

4. . . Reflective element

H. . . magnetic field

Claims (5)

An optical converter for an electronic device includes an energization conductor disposed in a container of an electronic device, an optical fiber wound so as to be perpendicular to an axial direction of the current conductor, and a permanent magnet provided at one end of the optical fiber The optical element and the reflective element provided at the other end, wherein one end of the optical fiber and the other end are bent in the same direction as the longitudinal direction of the current conducting conductor, and at least the optical element is disposed on the permanent magnet. The magnetic field axis is located in any imaginary plane that passes through the central axis of the energization conductor. The optical converter for an electronic device according to claim 1, wherein both of the optical element and the reflective element are opposite to one end of the optical fiber and the other end of the optical fiber. They are bent in the same direction and arranged on the same axis. The optical converter for an electronic device according to claim 1, wherein both of the optical element and the reflective element are opposite to one end of the optical fiber and the other end of the optical fiber. Bend in the same direction so that they are close to each other and in the same position. An optical converter for an electronic device comprising at least an electric conductor disposed in a container of an electronic device, an optical fiber wound so as to be perpendicular to an axial direction of the electric conductor, and a permanent magnet provided at one end of the optical fiber The optical element and the reflective element disposed at the other end, wherein the flange formed on the outer surface of the container is combined with at least two frame units, and is fixed in a detachable manner to have a groove And the annular frame of the storage case, wherein the optical fiber is bent in the same direction as the longitudinal direction of the current-carrying conductor in the groove of the annular frame, and the optical fiber is bent at the same time One end and the other end of the optical fiber of the body receiving seat are arranged such that the optical element and the reflective element are disposed in close proximity, and the optical element is disposed on any axis of the central axis of the current conducting conductor. Imaginary plane. The optical converter for an electronic device according to claim 4, wherein the housing of the annular frame is formed by inclining the axial direction of the current-carrying conductor.