Flexible-connection optical fiber current sensing unit

Abstract

The invention discloses an optical fiber current sensing unit capable of being flexibly connected. The optical fiber current sensing unit comprises a transmission optical cable and a sensitive optical cable, wherein the transmission optical cable and the sensitive optical cable are connected through the wave plate, the wave plate is fixed in the butt joint box, the other end of the sensitive optical cable is connected with the reflector assembly, the reflector assembly is detachably installed in the butt joint box, and an installation groove matched with the reflector in appearance is formed in the butt joint box and used for achieving alignment of the reflector and the wave plate. The optical fiber current sensing unit has the advantages of being fast to disassemble and assemble and fast in self-alignment, is lighter and smaller than an existing optical fiber current sensing unit, and can measure under the condition that a detected circuit is not cut off.

Description

Technical Field

[0001] The present invention relates to the technical field of current measurement, and more particularly to a flexibly connectable optical fiber current sensitive unit. Background Art

[0002] With the continuous upgrading and transformation of the power system, new technologies such as renewable energy power generation and smart grids have been widely used. For example, solar photovoltaic power generation, wind power generation, tidal power generation, etc., which are widely promoted and used at home and abroad, are connected to the power grid. However, the various disturbances caused to the power grid when connected to the power grid are far greater than those caused by traditional thermal power generation. As a result, the requirements for the accuracy, insulation, anti-electromagnetic interference ability, weight, volume, etc. of current sensitive units are getting higher and higher.

[0003] Compared with traditional current sensitive units, fiber optic current sensitive units have the advantages of good insulation performance, strong anti-electromagnetic interference ability, high measurement accuracy, small size, light weight, large measurement dynamic range, wide bandwidth, etc. However, the traditional fiber optic current sensitive unit has a simple structure, and the structure needs to be designed according to the specific application scenario in the early stage to adapt to different installation environments. The design and communication costs are high, and the adaptability and interchangeability are poor. It cannot be used in some narrow installation environments. In addition, the traditional fiber optic current sensitive unit needs to temporarily cut off the circuit during installation, and the sensitive unit is connected in series to the power grid line. With the widespread use of electricity in life, even a short-term cut-off of the line power supply will bring huge economic losses.

[0004] Therefore, how to overcome the above problems is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a flexibly connectable optical fiber current sensitive unit, which is used to solve the problem of flexible use and no need to cut off the detected line during the installation process.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A flexibly connectable optical fiber current sensitive unit, comprising a transmission optical cable and a sensitive optical cable;

[0008] The transmission optical cable and the sensitive optical cable are connected by a wave plate, which is fixed in the docking box.

[0009] The other end of the sensitive optical cable is connected to a reflector, and the reflector is detachably installed in a docking box, wherein a mounting groove matching the shape of the reflector is provided in the docking box for realizing alignment of the reflector and the wave plate.

[0010] Preferably, the transmission optical cable and the wave plate are axially welded at 45°, and the sensitive optical cable and the wave plate are axially welded at 0°.

[0011] Preferably, the wave plate is fixed in the docking box by gluing.

[0012] Preferably, the reflector is realized by plating a high-reflection mold on the end face of the sensitive optical cable.

[0013] Preferably, the reflector is wrapped with a reflector housing.

[0014] Preferably, the reflector housing, the reflector and the sensitive optical cable are integrally injection molded.

[0015] Preferably, the reflector housing is made of plastic.

[0016] Preferably, a through hole is preset on the side of the docking box, and the transmission optical cable and the sensitive optical cable are sealed with a sealant after passing through the through hole.

[0017] Preferably, a cavity for fixing the wave plate is provided inside the docking box, and a wave plate cover is fixed to the top of the cavity via a sealing gasket.

[0018] Preferably, a cover plate is provided on the top of the docking box, one end of the cover plate is connected to the box body through a rotatable structure, and when the cover plate and the box body are closed, they are fixed by screws.

[0019] It can be seen from the above technical solutions that the present invention discloses a flexibly connectable optical fiber current sensitive unit. Compared with the prior art, the optical fiber current sensitive unit in the present invention has the advantages of adaptive shape, quick disassembly and installation, and rapid self-alignment while having the advantages of the traditional optical fiber current sensitive unit. Compared with the traditional optical fiber current sensitive unit, the flexible current sensitive unit is smaller in size and lighter in weight. At the same time, it can be installed without cutting off the power supply of the detected circuit, which reduces the installation burden of the circuit.

[0020] In addition, the accuracy of the current sensitive unit can be adjusted according to specific needs and with different numbers of installed turns. In order to better meet the needs of current sensitive units in various environments and monitor more environmental parameters, the flexible optical fiber current sensitive unit has a sealed design.

[0021] The optical fiber current sensitive unit disclosed by the present invention has a good market prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1The principle structure diagram of the optical fiber current sensing unit provided by the present invention;

[0024] Figure 2 A structural diagram of a reflector assembly of a fiber optic current sensitive unit provided by the present invention;

[0025] Figure 3 A schematic diagram of a three-dimensional explosion structure of a fiber optic current sensitive unit provided by the present invention;

[0026] Figure 4 A front view of the optical fiber current sensing unit provided by the present invention after the wave plate cover is installed;

[0027] Figure 5 This is a structural diagram of the optical fiber current sensitive unit provided by the present invention after the reflector assembly is removed;

[0028] Figure 6 This is an overall structural diagram of the optical fiber current sensing unit provided by the present invention.

[0029] Figure numerals: 1-transmission optical cable; 2-docking box; 3-cover plate; 4-hand screw; 5-sensitive optical cable; 6-reflector assembly (6-1: reflector, 6-2: reflector housing); 7-axis pin; 8-wave plate cover plate; 9-screw; 10-sealing gasket; 11-wave plate. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention discloses a flexibly connectable optical fiber current sensitive unit, which has the advantages of adaptive shape, quick disassembly and installation, and rapid self-alignment while possessing the advantages of traditional optical fiber current sensitive units; and compared with traditional optical fiber current sensitive units, the flexible current sensitive unit is smaller in size and lighter in weight. At the same time, it can be installed without cutting off the power supply of the detected circuit, which reduces the installation burden on the circuit. The accuracy of the current sensitive unit can also be adjusted according to specific needs and different installation turns. Furthermore, in order to better adapt to the needs for current sensitive units in various environments and monitor more environmental parameters, the flexible optical fiber current sensitive unit has added a sealing design; it has a good market application prospect.

[0032] In one embodiment, the flexibly connectable optical fiber current sensitive unit includes a transmission optical cable 1 and a sensitive optical cable 5;

[0033] like Figure 1As shown, the transmission optical cable 1 and the sensitive optical cable 5 are connected through the wave plate 11. Preferably, a fusion method is adopted, wherein the transmission optical cable 1 and the wave plate 11 are 45° axially fused, and after passing through the 45° fusion point, they become two mutually perpendicular linear polarized lights, which propagate along the X-axis and Y-axis of the polarization-maintaining optical fiber respectively. After passing through the wave plate 11, the two linear polarized lights are respectively converted into left-handed circularly polarized lights and right-handed circularly polarized lights; the sensitive optical cable 5 is connected to the wave plate 11 in the docking box 2 and 0° axially fused. The sensitive optical cable 5 can be wound on the line to be detected to achieve a flexible function.

[0034] Further, the other end of the sensitive optical cable 5 is connected to the reflector assembly 6, such as Figure 2 The transmitting mirror assembly 6 includes a reflector 6-1 and a reflector housing 6-2, wherein the reflector 6-1 is wrapped with the reflector housing 6-2. In this embodiment, the reflector 6-1 is realized by plating a high reverse mold on the end face of the sensitive optical cable 5, and the reflector housing 6-2 is made of plastic material, and is integrally injection molded together with the reflector 6-1 and the sensitive optical cable 5 to achieve sealing of the reflector 6-1 and the sensitive optical cable 5.

[0035] In one embodiment, if Figure 3 , the wave plate 11 is fixed in the docking box 2, and a through hole is preset on the side of the docking box 2. The transmission optical cable 1 and the sensitive optical cable 5 pass through the through hole and are sealed with a sealant to achieve a seal between the docking box 2 and the optical cable. At the same time, in this embodiment, the wave plate 11 is fixed in the docking box 2 by gluing;

[0036] To further optimize the above technical solution, a cavity for fixing the wave plate 11 is provided inside the docking box 2, and a wave plate cover 8 is fixed to the top of the cavity through a sealing gasket 10 to seal the wave plate 11 and the optical cable fusion point. Figure 4 As shown, the wave plate cover 8 and the sealing gasket 10 are fixed on the docking box 2 by screws 9.

[0037] In one embodiment, due to the Faraday effect of the magnetic field generated by the current on the line, the optical fiber current sensitive unit generates a Faraday phase difference between the left-handed circularly polarized light and the right-handed circularly polarized light, and the left-handed circularly polarized light and the right-handed circularly polarized light are transmitted to the reflector, and the polarization states of the left-handed circularly polarized light and the right-handed circularly polarized light are reversed through the reflector 6-1 and returned along the original optical path. When passing through the sensitive optical cable 5 again, the phase difference generated by the Faraday effect is superimposed, and the left-handed circularly polarized light and the right-handed circularly polarized light are transformed into mutually orthogonal linear polarized light at the wave plate 11. Since the Faraday effect needs to form a complete loop in the sensitive unit, the reflector 6-1 needs to be aligned with the wave plate 11 to form a closed loop.

[0038] Therefore, Figure 3In this embodiment, the reflector assembly 6 is detachably installed in the docking box 2. When the current needs to be detected, the reflector assembly 6 is first taken out from the docking box 2, the sensitive optical cable is wound around the object to be detected, and finally the reflector assembly 6 is placed in the docking box 2;

[0039] As a preferred embodiment, the docking box 2 has an installation groove that matches the shape of the reflector assembly 6. The reflector assembly 6 can be taken out and put into the docking box 2 to achieve the function of quick installation, and can also achieve the function of quick alignment with the wave plate 11 during installation.

[0040] In one embodiment, if Figures 4 to 6 A cover plate 3 is provided on the top of the docking box 2, one end of the cover plate 3 is connected to the box body through a rotatable structure, and the cover plate 3 is fixed to the box body by screws when closed. In this embodiment, the cover plate 3 is connected to the docking box 2 through a pin 7, allowing the user to lift the cover up and down to open it, or rotate the cover in the horizontal direction to open it (this opening method is not shown), and two hand screws 4 are provided at the opening and closing ends of the cover plate 3 to facilitate the quick opening of the cover plate 3, so as to realize the quick removal and installation of the reflector assembly 6.

[0041] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flexibly connectable optical fiber current sensing unit, characterized in that: Including transmission optical cables and sensitive optical cables; The transmission optical cable and the sensitive optical cable are connected by a wave plate, which is fixed in the docking box. The other end of the sensitive optical cable is connected to a reflector assembly, and the reflector assembly is detachably installed in a docking box, wherein a mounting groove matching the shape of the reflector assembly is provided in the docking box for realizing alignment of the reflector and the wave plate.

2. The flexibly connectable optical fiber current sensing unit according to claim 1, characterized in that: The transmission optical cable and the wave plate are 45° axially fused, and the sensitive optical cable and the wave plate are 0° axially fused.

3. The flexibly connectable optical fiber current sensing unit according to claim 1, characterized in that: The wave plate is fixed in the docking box by gluing.

4. The flexibly connectable optical fiber current sensing unit according to claim 1, characterized in that: The reflector is realized by plating a high-reflection pattern on the end face of the sensitive optical cable.

5. The flexibly connectable optical fiber current sensing unit according to claim 4, characterized in that: The reflector is wrapped with a reflector housing.

6. The flexibly connectable optical fiber current sensing unit according to claim 5, characterized in that: The reflector housing, the reflector and the sensitive optical cable are integrally injection molded.

7. The flexibly connectable optical fiber current sensing unit according to claim 6, characterized in that: The reflector housing is made of plastic.

8. The flexibly connectable optical fiber current sensing unit according to claim 1, characterized in that: A through hole is preset on the side of the docking box, and the transmission optical cable and the sensitive optical cable are passed through the through hole and then sealed with a sealant.

9. The flexibly connectable optical fiber current sensing unit according to claim 1, characterized in that: A cavity for fixing the wave plate is provided inside the docking box, and a wave plate cover is fixed on the top of the cavity via a sealing gasket.

10. The flexibly connectable optical fiber current sensing unit according to claim 1, characterized in that: A cover plate is provided on the top of the docking box, one end of the cover plate is connected to the box body through a rotatable structure, and when the cover plate and the box body are closed, they are fixed by screws.

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