A current sensitive unit for measuring conductor current in a high temperature environment

Abstract

The present invention relates to the field of current measurement technology, and specifically to a current sensitive unit for measuring conductor current in a high temperature environment, comprising: a current measurement component and a heat insulation component; the heat insulation component comprises a fixed part and a movable part, wherein one end of the movable part is hinged to the fixed part, and the other end is clamped to the fixed part, and when the movable part is clamped to the fixed part, the two form a hollow frame for passing the conductor to be measured; the overall structure of the current measurement component is adapted to the contour of the heat insulation component, and the heat insulation component is a double-layer structure, and the current measurement component is wrapped between the double-layer structure. The present invention can be quickly installed and can measure the conductor current in a high temperature environment.

Description

Technical Field

[0001] The present invention relates to the technical field of current measurement, and more particularly to a current sensitive unit for measuring conductor current in a high temperature environment. Background Art

[0002] With the continuous upgrading and transformation of the power system, new technologies such as new energy power generation and smart grid are being used more and more widely. For example, the access to the power grid of solar photovoltaic power generation, wind power generation, tidal power generation, etc., which are widely promoted and used at home and abroad, brings much greater disturbances to the power grid than the disturbances of traditional thermal power generation. With the development of ultra-high voltage transmission and transformation technology, the requirements for the accuracy, insulation, anti-electromagnetic interference ability, weight, volume, etc. of current sensitive units are getting higher and higher. Compared with traditional current sensitive units, optical fiber 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, and wide bandwidth.

[0003] In the steel, metallurgy, machinery, and chemical industries, there are many conductors used to transmit large currents in high-temperature environments. Traditional fiber-optic current sensing units cannot withstand high ambient temperatures, so they cannot measure the current of conductors in high-temperature environments.

[0004] Therefore, how to measure the conductor current in a high temperature environment becomes a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a current sensitive unit for measuring conductor current in a high temperature environment, which can be quickly installed and measure the conductor current in a high temperature environment.

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

[0007] A current sensitive unit for measuring conductor current in a high temperature environment, comprising: a current measuring component and a heat insulation component;

[0008] The thermal insulation assembly comprises a fixed part and a movable part, wherein one end of the movable part is hinged to the fixed part, and the other end is clamped to the fixed part, and when the movable part is clamped to the fixed part, the two form a hollow frame for passing the conductor to be tested;

[0009] The overall structure of the current measurement component is adapted to the contour of the thermal insulation component, and the thermal insulation component is a double-layer structure, and the current measurement component is wrapped between the double-layer structure.

[0010] Furthermore, the current measurement assembly is composed of a reflector, a sensitive optical fiber, a wave plate and a transmission optical fiber which are fused in sequence;

[0011] One end of the sensitive optical fiber is fused to the reflector, and the other end is fused to one end of the wave plate at 0°; the other end of the wave plate is fused to the transmission optical fiber at 45°.

[0012] Further, the fixed part includes a front fixed heat insulation board and a rear fixed heat insulation board, and the movable part includes a front movable heat insulation board and a rear movable heat insulation board;

[0013] A wiring groove is provided on a side where the front fixed heat insulation board contacts the rear fixed heat insulation board, and a side where the front movable heat insulation board contacts the rear movable heat insulation board;

[0014] The sensitive optical fiber is arranged in the wiring trough; a part of the transmission optical fiber is arranged in the wiring trough, and another part is located outside the thermal insulation component.

[0015] Furthermore, a reflector mounting assembly is installed inside one end of the fixed portion that is clamped with the movable portion; the reflector mounting assembly includes a reflector mounting block, a reflector cover plate and a first Glenn head;

[0016] The reflector mounting block is provided with a first cavity for accommodating the reflector;

[0017] The reflector cover plate is fixedly connected to the reflector mounting block and covers the first cavity;

[0018] The first Glenn head is mounted on the outer side of the reflector mounting block;

[0019] One end of the sensitive optical fiber is fixed by the first Glenn head, extends into the first cavity, and is fused with the reflector.

[0020] Furthermore, a wave plate mounting assembly is installed inside one end of the movable part that is clamped with the fixed part; the wave plate mounting assembly includes a wave plate mounting block, a wave plate cover plate, a wave plate back plate, a second Glenn head and a third Glenn head;

[0021] The wave plate mounting block is provided with a second cavity for accommodating the wave plate;

[0022] The wave plate cover plate and the wave plate back plate are respectively fixedly connected to two sides of the wave plate mounting block and cover the second cavity;

[0023] The second Glenn head and the third Glenn head are respectively mounted on the outside of the wave plate mounting block;

[0024] The other end of the sensitive optical fiber is fixed by the second Glenn head, extends into the second cavity, and is fused with one end of the wave plate;

[0025] One end of the transmission optical fiber is fixed by the third Glenn head, extends into the second cavity, and is fused with the other end of the wave plate.

[0026] Furthermore, the front fixed heat insulation board and the rear fixed heat insulation board, as well as the front movable heat insulation board and the rear movable heat insulation board are connected via a plurality of locking screws.

[0027] Furthermore, the front fixed heat insulation board, the rear fixed heat insulation board, the front movable heat insulation board and the rear movable heat insulation board are all made of mica boards.

[0028] Furthermore, a locking hook is installed at the end of the fixed part, and a locking ring is installed at the end of the movable part. When the movable part is in a closed state, the locking hook and the locking ring are snap-connected.

[0029] It can be seen from the above technical solutions that, compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention wraps the current measuring component with a heat insulation component, and can measure the conductor current at a high temperature not higher than 1000 degrees Celsius. When the ambient temperature is not higher than 200 degrees Celsius, the measurement can be carried out for a long time; when the ambient temperature gradually rises, the measurement time will be shortened accordingly; when the ambient temperature exceeds 800 degrees, the measurement time is 20 to 30 minutes.

[0031] At the same time, the present invention arranges the thermal insulation component into a movable part and a fixed part, and the movable part can be opened and closed and connected to the fixed part. Through this structural design, it can be quickly installed on the conductor, which is convenient for quick installation and removal. The measurement process does not require power off, and has a good market prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 A schematic diagram of the structure of the current sensing unit provided by the present invention in a closed state;

[0034] Figure 2 A schematic diagram of the structure of the current sensing unit provided by the present invention in an open state;

[0035] Figure 3 A top view of a current sensing unit provided by the present invention;

[0036] Figure 4A left side view of the current sensing unit provided by the present invention;

[0037] Figure 5 A schematic diagram of a current measuring unit provided by the present invention;

[0038] Figure 6 A schematic diagram of the structure of the reflector mounting assembly provided by the present invention;

[0039] Figure 7 A schematic diagram of the structure of the wave plate mounting assembly provided by the present invention;

[0040] Figure 8 An exploded diagram of the structure of the current sensing unit provided by the present invention;

[0041] Fig. 9 A schematic diagram of the current sensing unit being installed on a conductor in step 1 provided by the present invention;

[0042] Fig.10 A schematic diagram of the current sensing unit being installed on a conductor in step 2 provided by the present invention;

[0043] Fig.11 This is a schematic diagram of the current sensing unit being installed on the conductor in step 3 provided by the present invention.

[0044] In the figure, 1 is a reflector, 2 is a sensitive optical fiber, 3 is a wave plate, 4 is a transmission optical fiber, 5 is a reflector mounting block, 6 is a reflector cover, 7-1 is a first Glenn head, 7-2 is a second Glenn head, 7-3 is a third Glenn head, 8 is a wave plate mounting block, 9 is a wave plate cover, 10 is a wave plate back plate, 11 is a front fixed heat insulation board, 12 is a rear fixed heat insulation board, 13 is a front movable heat insulation board, 14 is a rear movable heat insulation board, 15 is a locking ring, 16 is a locking hook, 17 is a locking screw, 100 is a current sensitive unit, and 200 is a conductor. DETAILED DESCRIPTION

[0045] 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.

[0046] like Figure 1-Figure 8 As shown, an embodiment of the present invention discloses a current sensitive unit for measuring conductor current in a high temperature environment, comprising: a current measuring component and a heat insulation component;

[0047] The heat insulation assembly includes a fixed part and a movable part, wherein one end of the movable part is hinged to the fixed part, and the other end is clamped to the fixed part. When the movable part is clamped to the fixed part, the two form a hollow frame for passing the conductor to be tested;

[0048] The overall structure of the current measurement component is adapted to the contour of the thermal insulation component, and the thermal insulation component is a double-layer structure, wrapping the current measurement component between the double-layer structure.

[0049] Specifically, if Figure 5 As shown, the current measurement assembly is composed of a reflector 1, a sensitive optical fiber 2, a wave plate 3 and a transmission optical fiber 4 which are fused in sequence;

[0050] One end of the sensitive optical fiber 2 is fused to the reflector 1 , and the other end is fused to one end of the wave plate 3 at 0°; the other end of the wave plate 3 is fused to the transmission optical fiber 4 at 45°.

[0051] When current passes through a conductor, a magnetic field is generated on the surface of the conductor. This magnetic field interacts with the Faraday effect in the sensitive optical fiber, causing the optical phase of the sensitive optical fiber to change. This change can be captured by a reflector and further used to measure the magnitude of the current. The sensitive optical fiber can detect the change in the magnetic field caused by the conductor current. When the current passes through the conductor, a magnetic field is generated around it. The optical phase in the sensitive optical fiber changes with the change in the magnetic field. This phase change can be processed by a specific algorithm to accurately measure the magnitude of the current. The wave plate divides the incident laser beam into two beams of light with different polarization directions, and then the two beams of light are recombined into one beam after the interaction between the sensitive optical fiber and the reflector. In this process, the change in the magnetic field caused by the current will cause the optical phase in the sensitive optical fiber to change, thereby causing the output light intensity to change. By measuring the intensity change of the output light intensity, the magnitude of the current can be accurately calculated. The transmission optical fiber is responsible for transmitting the optical signal in the sensitive optical fiber to an external device for detection and processing.

[0052] The end where the fixed part and the movable part are connected has a receiving space inside for installing the reflector mounting assembly; Figure 6 As shown, the reflector mounting assembly includes a reflector mounting block 5, a reflector cover plate 6 and a first gland 7-1; the reflector mounting block 5 and the reflector cover plate 6 form a box body. When the fixed part is engaged with the movable part, the box body extends into the movable part.

[0053] The reflector mounting block 5 is provided with a first cavity for accommodating the reflector 1 ; the reflector 1 is fixed at a designated position in the first cavity by gluing.

[0054] The reflector cover plate 6 is fixedly connected to the reflector mounting block 5 and covers the first cavity;

[0055] The first Glenn head 7-1 is installed on the outer side of the reflector mounting block 5 through its own thread;

[0056] One end of the sensitive optical fiber 2 is fixed by the first Glenn head 7 - 1 , extends into the first cavity, and is fused with the reflector 1 .

[0057] More advantageously, both the reflector mounting block 5 and the reflector cover plate 6 are made of glass fiber reinforced plastics, which have good mechanical properties and are insulating and high temperature resistant.

[0058] The end where the movable part is connected to the fixed part has a receiving space inside for installing the wave plate installation component; Figure 7 As shown, the wave plate mounting assembly includes a wave plate mounting block 8, a wave plate cover plate 9, a wave plate back plate 10, a second Glenn head 7-2 and a third Glenn head 7-3; the wave plate mounting block 8, the wave plate cover plate 9 and the wave plate back plate 10 form a box body, and the second Glenn head 7-2 and the third Glenn head 7-3 are installed on the outside of the box body.

[0059] The wave plate mounting block 8 is provided with a second cavity for accommodating the wave plate 3; the wave plate 3 is fixed at a designated position in the second cavity by gluing. At the same time, a receiving space is reserved on the top of the wave plate mounting block 8, and the receiving space is used to accommodate a box body composed of the reflector mounting block 5 and the reflector cover plate 6. At the same time, the receiving space can also realize the limiting of the box body of the reflector mounting assembly.

[0060] The wave plate cover plate 9 and the wave plate back plate 10 are respectively fixedly connected to the two sides of the wave plate mounting block 8 and cover the second cavity; specifically, the wave plate cover plate 9 and the wave plate back plate 10 are fixed to the wave plate mounting block by screws.

[0061] The second Glenn head 7-2 and the third Glenn head 7-3 are respectively mounted on the outside of the wave plate mounting block 8 through their own threads;

[0062] The other end of the sensitive optical fiber 2 is fixed by the second Glenn head 7-2, extends into the second cavity, and is fused with one end of the wave plate 3;

[0063] One end of the transmission optical fiber 4 is fixed by the third Glenn head 7 - 3 , extends into the second cavity, and is fused with the other end of the wave plate 3 .

[0064] Likewise, the wave plate mounting block 8, the wave plate cover plate 9 and the wave plate back plate 10 are made of glass fiber reinforced plastics, which have good mechanical properties and are insulating and high temperature resistant.

[0065] Next, the structure of the thermal insulation assembly is further described. The fixed part includes a front fixed thermal insulation board 11 and a rear fixed thermal insulation board 12, and the movable part includes a front movable thermal insulation board 13 and a rear movable thermal insulation board 14. The front fixed thermal insulation board 11, the rear fixed thermal insulation board 12, the front movable thermal insulation board 13 and the rear movable thermal insulation board 14 form a structural shell, which wraps the current measurement assembly, the reflector mounting assembly and the wave plate mounting assembly.

[0066] A wiring groove is provided on the contacting side of the front fixed heat insulation board 11 and the rear fixed heat insulation board 12, and on the contacting side of the front movable heat insulation board 13 and the rear movable heat insulation board 14;

[0067] The sensitive optical fiber 2 is arranged in the wiring trough; a part of the transmission optical fiber 4 is arranged in the wiring trough, and the other part is located outside the heat insulation component.

[0068] The front fixed heat shield 11 and the rear fixed heat shield 12, as well as the front movable heat shield 13 and the rear movable heat shield 14 are connected by a plurality of locking screws 17. The reflector mounting assembly and the wave plate mounting assembly are also mounted on the fixed part and the movable part respectively by locking screws.

[0069] In addition, a pair of locking screws can be installed at one end where the fixed part and the movable part are connected, and the movable part can rotate around the pair of locking screws, thereby realizing the hinge connection between the movable part and the fixed part.

[0070] More advantageously, the front fixed heat insulation board 11, the rear fixed heat insulation board 12, the front movable heat insulation board 13 and the rear movable heat insulation board 14 are all made of high temperature resistant mica boards, which have very low thermal conductivity and can well block the ambient temperature.

[0071] In one embodiment, a locking hook 16 is installed at the end of the fixed part, and a locking ring 15 is installed at the end of the movable part. When the movable part is in a closed state, the locking hook 16 and the locking ring 15 are engaged. Similarly, the locking ring 15 is installed on the movable part by screws, and the locking hook 16 is installed on the fixed part by screws.

[0072] Next, refer to Figure 9-11 Taking a horizontal conductor as an example, the process of installing the current sensing unit of the present invention on the conductor is further described. The specific installation steps are:

[0073] Step 1: The current sensing unit 100 is in a fully opened state, and then placed above the conductor 200 with the opening facing the conductor 200 .

[0074] Step 2: Move the current sensing unit 100 downward and insert the conductor 200 therein.

[0075] Step 3: close the current sensing unit 100 and lock the buckle to finally cover the conductor 200.

[0076] 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.

[0077] 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 current sensing unit for measuring conductor current in a high temperature environment, characterized in that: include: Current measurement components and thermal insulation components; The thermal insulation assembly comprises a fixed part and a movable part, wherein one end of the movable part is hinged to the fixed part, and the other end is clamped to the fixed part, and when the movable part is clamped to the fixed part, the two form a hollow frame for passing the conductor to be tested; The overall structure of the current measurement component is adapted to the contour of the thermal insulation component, and the thermal insulation component is a double-layer structure, and the current measurement component is wrapped between the double-layer structure; The current measurement assembly is composed of a reflector, a sensitive optical fiber, a wave plate and a transmission optical fiber which are fused in sequence; One end of the sensitive optical fiber is fused to the reflector, and the other end is fused to one end of the wave plate at 0°; the other end of the wave plate is fused to the transmission optical fiber at 45°; The fixed part includes a front fixed heat insulation board and a rear fixed heat insulation board, and the movable part includes a front movable heat insulation board and a rear movable heat insulation board; the front fixed heat insulation board, the rear fixed heat insulation board, the front movable heat insulation board and the rear movable heat insulation board are all made of mica board; A wiring groove is provided on a side where the front fixed heat insulation board contacts the rear fixed heat insulation board, and a side where the front movable heat insulation board contacts the rear movable heat insulation board; The sensitive optical fiber is arranged in the wiring trough; a part of the transmission optical fiber is arranged in the wiring trough, and another part is located outside the thermal insulation component; A reflector mounting assembly is installed inside one end of the fixed portion that is clamped with the movable portion; the reflector mounting assembly includes a reflector mounting block and a reflector cover plate; A wave plate mounting assembly is installed inside one end of the movable part that is clamped with the fixed part; the wave plate mounting assembly includes a wave plate mounting block; A receiving space is also reserved on the top of the wave plate mounting block, and the receiving space is used to receive a box body composed of the reflector mounting block and the reflector cover plate.

2. The current sensing unit for measuring conductor current in a high temperature environment according to claim 1, characterized in that: The reflector mounting assembly further includes a first Glenn head; The reflector mounting block is provided with a first cavity for accommodating the reflector; The reflector cover plate is fixedly connected to the reflector mounting block and covers the first cavity; The first Glenn head is mounted on the outer side of the reflector mounting block; One end of the sensitive optical fiber is fixed by the first Glenn head, extends into the first cavity, and is fused with the reflector.

3. The current sensing unit for measuring conductor current in a high temperature environment according to claim 1, characterized in that: The wave plate mounting assembly further comprises a wave plate cover plate, a wave plate back plate, a second Glenn head and a third Glenn head; The wave plate mounting block is provided with a second cavity for accommodating the wave plate; The wave plate cover plate and the wave plate back plate are respectively fixedly connected to two sides of the wave plate mounting block and cover the second cavity; The second Glenn head and the third Glenn head are respectively mounted on the outside of the wave plate mounting block; The other end of the sensitive optical fiber is fixed by the second Glenn head, extends into the second cavity, and is fused with one end of the wave plate; One end of the transmission optical fiber is fixed by the third Glenn head, extends into the second cavity, and is fused with the other end of the wave plate.

4. The current sensing unit for measuring conductor current in a high temperature environment according to claim 1, characterized in that: The front fixed heat insulation board and the rear fixed heat insulation board, as well as the front movable heat insulation board and the rear movable heat insulation board are connected via a plurality of locking screws.

5. The current sensing unit for measuring conductor current in a high temperature environment according to claim 1, characterized in that: A locking hook is installed at the end of the fixed part, and a locking ring is installed at the end of the movable part. When the movable part is in a closed state, the locking hook and the locking ring are snap-connected.

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