Rogowski coil and electronic transformer

Abstract

The invention belongs to the field of electrical performance testing devices, and particularly relates to a Rogowski coil and an electronic transformer. In order to enable the Rogowski coil to change the transmission path of current according to the actual situation, the invention provides the Rogowski coil. The Rogowski coil comprises a coil body and a current intercepting structure, the coil body comprises an inner wire and an outer spiral line, the current intercepting structure is used for conducting the inner wire and the outer spiral line in advance, the current intercepting structure comprises a conductive clamping structure and at least two length adjusting parts arranged on the coil body, and each length adjusting part comprises two exposed parts which are not in contact. Wherein one exposed part is electrically connected with the inner wire, the other exposed part is electrically connected with the outer spiral line, and the conductive clamping structure is used for clamping the two exposed parts in any length adjusting part at the same time. The invention further provides an electronic transformer comprising the Rogowski coil. The inner wire and the outer spiral line are conducted in advance through the current intercepting structure, so that the current transmission path is changed.

Description

Technical Field

[0001] The invention belongs to the field of electrical performance testing devices, and in particular relates to a Rogowski coil and an electronic mutual inductor. Background Art

[0002] The Rogowski coil is a current sensor that is widely used in electronic current transformers.

[0003] When measuring current, the Rogowski coil needs to be put on the conductor to be measured. At present, the inner diameter of the Rogowski coils on the market is constant, which means that when measuring conductors with different outer diameters, Rogowski coils with different inner diameters need to be used. Therefore, an electronic transformer needs to be equipped with Rogowski coils with multiple inner diameters, which is costly. When measuring the conductor to be measured, the Rogowski coil needs to be replaced according to the actual situation, which is troublesome to operate.

[0004] In order to solve the above problem, a measuring device with an adjustable inner diameter of the circle is proposed in the prior art.

[0005] For example, a Chinese invention patent with authorization announcement number CN110470867B and authorization announcement date 2024.10.29 discloses an adjustable length Rogowski coil measuring device with non-contact voltage measurement. The measuring device includes a Rogowski coil (i.e., a Rogowski coil) and a main body. A slot is provided on the main body. One end of the Rogowski coil is fixed on the main body. One section of the Rogowski coil is stuck in the slot. When different parts of the Rogowski coil are stuck in the slot, the inner diameter of the circle enclosed by the Rogowski coil is different, thereby adapting to different conductors to be measured.

[0006] For example, a Korean invention patent with authorization announcement number KR102213783B1 and authorization announcement date 2021.02.09 discloses a free wide-width Rogowski coil, which includes a coil body 2 and a clamping unit 1 for clamping the coil body 2. The coil body 2 is provided with a starting part 4 and multiple length adjustment parts 3. The clamping unit 1 is provided with two clamping parts, one of which is used to always clamp the starting part 4, and the other clamping part is used to clamp different length adjustment parts 3, thereby changing the inner diameter of the circle surrounded by the coil body 2 to adapt to different conductors under test.

[0007] However, in the above two invention patents, the induced current in the Rogowski coil needs to flow through the complete Rogowski coil, which results in a too long transmission path of the induced current, more interference and greater loss. Summary of the invention

[0008] The object of the present invention is to provide a Rogowski coil to solve the technical problem that the induced current in the existing Rogowski coil needs to flow through the complete Rogowski coil, which leads to a too long transmission path of the induced current, more interference and greater loss.

[0009] The present invention also aims to provide an electronic mutual inductor to solve the same technical problem as above.

[0010] To achieve the above purpose, the technical solution of the Rogowski coil provided by the present invention is: A Rogowski coil comprises a coil body and a current cut-off structure, wherein the coil body comprises an inner conductor and an outer spiral wire, one end of the inner conductor is connected to one end of the outer spiral wire to form a connecting portion, and the current cut-off structure is used to make the inner conductor and the outer spiral wire conduct in advance before the connecting portion, and the current cut-off structure comprises a conductive clamping structure and at least two length adjustment portions arranged on the coil body, all the length adjustment portions are arranged at intervals along the length direction of the coil body, and each length adjustment portion comprises two non-contacting exposed parts, one of which is electrically connected to the inner conductor, and the other is electrically connected to the outer spiral wire, and the conductive clamping structure is used to simultaneously clamp the two exposed parts in any one of the length adjustment portions, so that the inner conductor and the outer spiral wire are conducted in advance through the conductive clamping structure and the clamped length adjustment portion.

[0011] Furthermore, the exposed part is an exposed ring.

[0012] Furthermore, the conductive clamping structure includes two arc-shaped clamping jaws respectively used to clamp different exposed rings, and the two clamping jaws are conductively connected through a conductive member, thereby achieving early conduction of the inner conductive wire and the outer spiral wire.

[0013] Furthermore, each arc-shaped clamping jaw includes an arc-shaped clamping jaw body and an arc-shaped electrical connection piece fixedly mounted on the inner surface of the clamping jaw body, the electrical connection piece is used for conductive connection with the exposed ring, and the conductive piece is used for electrically connecting the two electrical connections.

[0014] Furthermore, the conductive clamping structure includes an insulating clamping seat, two clamping jaws are arranged on the insulating clamping seat, a mounting hole is provided on the insulating clamping seat, two ends of the mounting hole extend to the two clamping jaws respectively, and the conductive member is installed in the mounting hole.

[0015] Furthermore, an insulating ring is provided between the two exposed parts, and the outer diameter of the insulating ring is greater than the distance between the outermost side of the exposed part and the inner conductor.

[0016] Furthermore, the conductive clamping structure also includes an arc-shaped positioning groove matching the insulating ring. When the exposed part is clamped by the conductive clamping structure, the insulating ring is located in the arc-shaped positioning groove to form an insulating positioning ring to ensure that the conductive clamping structure is conductively connected to the exposed part.

[0017] Furthermore, the insulating ring is fixedly mounted on the coil body, and two axial ends of the insulating ring are respectively fixedly connected to different exposed parts.

[0018] Furthermore, the Rogowski coil also includes a shell, one end of the coil body away from the connecting portion is fixedly connected to the shell, and one end of the coil body away from the connecting portion is connected to a signal output line for outputting the induced current to the outside.

[0019] The beneficial effects of the Rogowski coil of the present invention are as follows: the present invention is a pioneering invention. When measuring different conductors to be measured, according to actual conditions, the conductive clamping structure clamps the two exposed parts of the corresponding length adjustment part, so that the inner conductor and the outer spiral wire are connected in advance at a suitable position. At this time, the induced current generated on the outer spiral wire does not need to flow through the entire Rogowski coil, and can flow into the inner conductor through the cut-off structure in advance, thereby shortening the transmission path of the induced current, reducing the interference suffered by the induced current and reducing the loss of the induced current, thereby improving the accuracy of the Rogowski coil measurement result.

[0020] To achieve the above object, the technical solution of the electronic transformer provided by the present invention is: An electronic mutual inductor comprises a Rogowski coil, wherein the Rogowski coil comprises a coil body and a current cut-off structure, wherein the coil body comprises an inner conductor and an outer spiral wire, wherein one end of the inner conductor is connected to one end of the outer spiral wire to form a connecting portion, and the current cut-off structure is used to make the inner conductor and the outer spiral wire conduct in advance before the connecting portion, and the current cut-off structure comprises a conductive clamping structure and at least two length adjustment portions arranged on the coil body, wherein all the length adjustment portions are arranged at intervals along the length direction of the coil body, and each length adjustment portion comprises two non-contacting exposed parts, wherein one exposed part is electrically connected to the inner conductor, and the other exposed part is electrically connected to the outer spiral wire, and the conductive clamping structure is used to simultaneously clamp the two exposed parts in any one of the length adjustment portions, so that the inner conductor and the outer spiral wire are conducted in advance through the conductive clamping structure and the clamped length adjustment portion.

[0021] Furthermore, the exposed part is an exposed ring.

[0022] Furthermore, the conductive clamping structure includes two arc-shaped clamping jaws respectively used to clamp different exposed rings, and the two clamping jaws are conductively connected through a conductive member, thereby achieving early conduction of the inner conductive wire and the outer spiral wire.

[0023] Furthermore, each arc-shaped clamping jaw includes an arc-shaped clamping jaw body and an arc-shaped electrical connection piece fixedly mounted on the inner surface of the clamping jaw body, the electrical connection piece is used for conductive connection with the exposed ring, and the conductive piece is used for electrically connecting the two electrical connections.

[0024] Furthermore, the conductive clamping structure includes an insulating clamping seat, two clamping jaws are arranged on the insulating clamping seat, a mounting hole is provided on the insulating clamping seat, two ends of the mounting hole extend to the two clamping jaws respectively, and the conductive member is installed in the mounting hole.

[0025] Furthermore, an insulating ring is provided between the two exposed parts, and the outer diameter of the insulating ring is greater than the distance between the outermost side of the exposed part and the inner conductor.

[0026] Furthermore, the conductive clamping structure also includes an arc-shaped positioning groove matching the insulating ring. When the exposed part is clamped by the conductive clamping structure, the insulating ring is located in the arc-shaped positioning groove to form an insulating positioning ring to ensure that the conductive clamping structure is conductively connected to the exposed part.

[0027] Furthermore, the insulating ring is fixedly mounted on the coil body, and two axial ends of the insulating ring are respectively fixedly connected to different exposed parts.

[0028] Furthermore, the Rogowski coil also includes a shell, one end of the coil body away from the connecting portion is fixedly connected to the shell, and one end of the coil body away from the connecting portion is connected to a signal output line for outputting the induced current to the outside.

[0029] The beneficial effects of the electronic transformer of the present invention are as follows: the present invention is an improved invention. The electronic transformer adopts a brand-new Rogowski coil. When measuring different conductors to be measured, according to the actual situation, the conductive clamping structure clamps the two exposed parts of the corresponding length adjustment part, so that the inner conductor and the outer spiral wire are connected in advance at the appropriate position. At this time, the induced current generated on the outer spiral wire does not need to flow through all the Rogowski coils, and can flow into the inner conductor through the cut-off structure in advance, thereby shortening the transmission path of the induced current, reducing the interference of the induced current and reducing the loss of the induced current, thereby improving the accuracy of the measurement results of the electronic transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an existing free wide Rogowski coil; Figure 2 A schematic diagram of the structure of the Rogowski coil of the present invention (part of the coil body is hidden); Figure 3 An exploded view of the structure of the Rogowski coil of the present invention (part of the coil body is hidden); Figure 4 for Figure 3 A magnified view of the structure at center A; Figure 5 It is a schematic structural diagram of the exposed ring of the Rogowski coil of the present invention; Figure 6 It is a structural schematic diagram of the current cut-off structure in the Rogowski coil of the present invention; Figure 7It is a structural schematic diagram of the electronic mutual inductor of the present invention.

[0031] Description of reference numerals: Figure 1 Middle: 1. Clamping unit; 2. Coil body; 3. Length adjustment part; 4. Starting part.

[0032] Figures 2 to 7 In: 1. Shell; 2. Coil body; 2-1. Inner conductor; 2-2. Outer spiral wire; 2-3. Insulating inner core; 2-4. Shielding layer; 2-5. Outer jacket layer; 3. Insulating positioning ring; 4. Signal output line; 5. Insulating clamping seat; 5-1. Arc-shaped positioning groove; 5-2. Clamping jaw body; 5-3. Opening; 5-4. Perforation; 6. Conductive part; 7. Electrical connection part; 8. Exposed ring; 9. Outer spiral wire lap joint; 10. Inner conductor lap joint; 11. Integrator; 12. Display module. DETAILED DESCRIPTION

[0033] In order to solve the problems in the background technology, the core inventive concept of the present invention is: multiple length adjustment parts are set on the coil body, and a conductive clamping structure is set for electrically connecting to any length adjustment part, so that the inner conductor and the outer spiral wire can be connected in advance at the appropriate position according to actual needs.

[0034] The present invention is further described in detail below in conjunction with embodiments.

[0035] Specific embodiments of the Rogowski coil provided by the present invention: In reference Figure 7 On the basis of Figures 2 to 6 As shown, as a basic specific implementation method of the first category, the Rogowski coil includes a coil body 2 and a current-cutting structure, the coil body 2 includes an inner conductor 2-1 and an outer spiral 2-2, one end of the inner conductor 2-1 is connected to one end of the outer spiral 2-2 to form a connecting portion, and the current-cutting structure is used to make the inner conductor 2-1 and the outer spiral 2-2 conduct in advance before the connecting portion, the current-cutting structure includes a conductive clamping structure and at least two length adjustment portions arranged on the coil body 2, all length adjustment portions are arranged at intervals along the length direction of the coil body 2, and each length adjustment portion includes two non-contacting exposed parts, one of which is electrically connected to the inner conductor 2-1, and the other is electrically connected to the outer spiral 2-2, and the conductive clamping structure is used to simultaneously clamp the two exposed parts in any one of the length adjustment portions, so that the inner conductor 2-1 and the outer spiral 2-2 are conducted in advance through the conductive clamping structure and the clamped length adjustment portion.

[0036] like Figure 5As shown, the coil body 2 comprises, from the inside to the outside, an inner conductor 2-1, an insulating inner core 2-3, an outer helix 2-2, a shielding layer 2-4 and an outer sheath 2-5, one of the exposed parts being electrically connected to the outer helix 2-2 via an outer helix connector 9, and another exposed part being electrically connected to the inner conductor 2-1 via an inner conductor connector 10, the outer helix connector 9 passing through the outer sheath 2-5 and the shielding layer 2-4, and the inner conductor connector 10 passing through the outer sheath 2-5, the shielding layer 2-4 and the insulating inner core 2-3.

[0037] The insulating inner core 2-3 can provide an installation basis and physical support for the installation of the inner conductor 2-1 and the outer spiral wire 2-2, and can prevent the inner conductor 2-1 from being short-circuited with the outer spiral wire 2-2. At the same time, the insulating inner core 2-3 can also protect the inner conductor 2-1, prevent the inner conductor 2-1 from being mechanically damaged and reduce the interference of the external electromagnetic field on the inner conductor 2-1, thereby improving the accuracy of the output signal of the inner conductor 2-1; the winding method and number of turns of the outer spiral wire 2-2 directly affect the measurement accuracy and sensitivity of the Rogowski coil. By adjusting these parameters, the Rogowski coil can adapt to the current measurement requirements of different sizes and frequencies; the shielding layer 2-4 is used to resist the interference of the external electromagnetic field, prevent the external stray signal from interfering with the outer spiral wire 2-2 and the inner conductor 2-1, and improve the accuracy of the output signal of the inner conductor 2-1; the outer jacket layer 2-5 has good insulation performance, mechanical strength and corrosion resistance, thereby preventing the internal structure of the outer jacket layer 2-5 from being eroded by environmental factors such as moisture, dust or chemicals, and can also prevent the coil body 2 from being damaged by squeezing or pulling by external forces.

[0038] When measuring the current in the conductor being measured, under the action of the electromagnetic field generated by the current in the conductor being measured, an induced electromotive force and an induced current will be generated on the outer spiral wire 2-2. Then, the induced current on the outer spiral wire 2-2 will be output to other subsequent processing equipment through the inner conductor 2-1.

[0039] The conductive clamping structure and the exposed part are used to achieve early conduction between the inner conductor 2-1 and the outer spiral wire 2-2, eliminating the need for complex wiring operations and improving the reliability and convenience of the electrical connection.

[0040] like Figures 2 to 6 As shown, in the 1-1 type of specific implementation, the number of length adjustment parts is three. When the conductive clamping structure clamps different length adjustment parts, the effective length of the Rogowski coil is different and the length of the path through which the induced current needs to flow is different.

[0041] In the 1-2 type of specific implementation, the number of the length adjustment parts is two.

[0042] In other specific embodiments, the number of the length adjustment parts may be four, five or more.

[0043] When measuring different conductors to be measured, according to actual conditions, the conductive clamping structure is used to clamp the two exposed parts of the corresponding length adjustment part, so that the inner conductor 2-1 and the outer spiral wire 2-2 are connected in advance at the appropriate position. At this time, the induced current generated on the outer spiral wire 2-2 does not need to flow through the entire Rogowski coil, and can flow into the inner conductor 2-1 through the cut-off structure in advance, thereby changing the effective length of the Rogowski coil, shortening the transmission path of the induced current, reducing the interference of the induced current and reducing the loss of the induced current, thereby improving the accuracy of the Rogowski coil measurement result.

[0044] In order to simplify the structure, in the second type of specific implementation, as Figures 2 to 6 As shown, the Rogowski coil also includes a housing 1, and one end of the coil body 2 away from the connection portion is fixedly connected to the housing 1, and one end of the coil body 2 away from the connection portion is connected to a signal output line 4 for outputting the induced current to the outside, and the structure is simple. The signal output line 4 is a key channel for transmitting the induced current of the coil body 2 to subsequent processing equipment.

[0045] In a third embodiment different from the second embodiment, reference is made to Figure 1 As shown, the number of the length adjustment parts is at least three, and specifically can be three, four, five or more; the clamping structure also includes a starting clamping structure for clamping any length adjustment part, and the starting clamping structure includes a clamping part for electrically connecting to the two exposed parts respectively, and the two clamping parts are respectively conductively connected to the two wires in the signal output line 4. At this time, by making the starting clamping structure and the conductive clamping structure clamp different length adjustment parts respectively, the effective length of the Rogowski coil is changed and the length of the path through which the induced current needs to flow is shortened.

[0046] At this time, the present invention and Figure 1 The main difference of the Korean invention patent with the authorization announcement number KR102213783B1 shown is that, in the present invention, the length adjustment part has an exposed part electrically connected to the inner conductor 2-1 and the outer spiral wire 2-2, and the conductive clamping structure for clamping one of the length adjustment parts can make the two exposed parts conductive, while the starting clamping structure for clamping the other length adjustment part can make the two exposed parts conductive with the two conductors in the signal output line 4 respectively.

[0047] In order to facilitate the electrical connection between the conductive clamping structure and the exposed part, the specific definition of the exposed part in the present invention is as follows: like Figures 2 to 6 As shown, in the preferred fourth embodiment, the exposed part is an exposed ring 8, which has a larger exposed area, and can conveniently electrically connect the conductive clamping structure to the exposed ring 8. At the same time, no matter at which angle the coil body 2 rotates circumferentially, the conductive clamping structure can be electrically connected to the exposed ring 8, and is easy to use.

[0048] On the basis of the fourth specific implementation mode, in order to conveniently electrically connect the conductive clamping structure to the exposed part, the present invention specifically defines the conductive clamping structure as follows: like Figures 2 to 6 As shown, in the preferred embodiment of the 4-1 class, the conductive clamping structure includes two arc-shaped clamping jaws for clamping different exposed rings 8, and the two clamping jaws are conductively connected through the conductive member 6, so as to achieve early conduction of the inner conductor 2-1 and the outer spiral wire 2-2. The clamping jaw is arc-shaped, which can increase the contact area between the clamping jaw and the exposed ring 8. On the one hand, it can effectively reduce the resistance at the connection between the clamping jaw and the exposed ring 8, and on the other hand, it can enable the clamping jaw to better clamp the exposed ring 8.

[0049] like Figures 2 to 6 As shown, in order to simplify the structure, in the 4-1-1 type specific implementation mode, each arc-shaped clamping jaw includes an arc-shaped clamping jaw body 5-2 and an arc-shaped power connection piece 7 fixedly mounted on the inner surface of the clamping jaw body 5-2, the power connection piece 7 is used to be conductively connected to the exposed ring 8, and the conductive piece 6 is used to electrically connect the two power connections 7, and the structure is simple.

[0050] However, in the specific implementation manner of type 4-1-2, each arc-shaped clamping jaw can also be made entirely of conductive materials.

[0051] like Figures 2 to 6 As shown, in order to reduce external interference, in the specific implementation manner of Class 4-1-3, the conductive clamping structure includes an insulating clamping seat 5, two clamping jaws are arranged on the insulating clamping seat 5, and a mounting hole is provided on the insulating clamping seat 5. The two ends of the mounting hole extend to the two clamping jaws respectively, and the conductive member 6 is installed in the mounting hole. At this time, the insulating clamping seat 5 can protect the conductive member 6 and reduce the interference of the external electromagnetic field on the current in the conductive member 6.

[0052] In the 4-1-4 type of specific implementation, both clamps are arranged on the shell 1, and the conductive member 6 is exposed to the air. At this time, the conductive clamping structure can still cooperate with the length adjustment part to achieve early conduction of the outer spiral wire 2-2 and the inner conductor 2-1.

[0053] like Figure 4 and 6 As shown, in the specific implementation of Class 4-1, since the clamp is in an arc shape, the clamp has a through hole 5-4 and an opening 5-3. When in use, the coil body 2 can be loaded into the clamp from the opening 5-3, and at the same time, the coil body 2 can pass through the through hole 5-4, which is convenient for installing the coil body 2 on the clamp and also convenient for removing the coil body 2 from the clamp. The size of the through hole 5-4 matches the size of the exposed part to ensure that the clamp clamps the exposed part.

[0054] like Figure 4 and6 As shown, the clamp is a fixed clamp, that is, the clamp will not move. However, in the specific implementation of type 4-2, two fingers of the finger cylinder can also be used to form a clamp, in which case the clamp can be opened and closed, so that the clamp can conveniently clamp the coil body 2.

[0055] In the 4-3 type specific implementation mode, the clamp is a whole "U"-shaped clamp, and the "U"-shaped clamp is made of conductive material. The clamp includes two cantilever parts and an arc part connecting the two cantilever parts. When in use, the two cantilever parts are in point contact with the exposed ring 8 respectively, thereby clamping the exposed ring 8 and achieving conduction between the two exposed rings 8.

[0056] In the 4-4 specific embodiment, different from the 4-1 specific embodiment, the clamp is an arc-shaped clamp made entirely of conductive material, and the arc-shaped clamp clamps two exposed rings 8 at the same time.

[0057] In the 4-5th type of specific implementation manner, different from the 4-3th type of specific implementation manner, there are two "U"-shaped clamping jaws, which respectively clamp different exposed rings 8, and the two "U"-shaped clamping jaws are conductively connected through the conductive member 6.

[0058] In the inferior fifth type of specific implementation, the exposed part is an exposed block or an exposed tube or other structures. In this case, the exposed part is only arranged on one side of the coil body 2. When the conductive clamping structure is used to clamp the length adjustment part, the coil body 2 needs to be rotated circumferentially to ensure that the exposed part is in electrical contact with the conductive clamping structure. This is more troublesome to use, but does not affect the normal use of the Rogowski coil.

[0059] To avoid the phenomenon of direct short circuit between two exposed parts, such as Figures 2 to 6 As shown, in the preferred sixth embodiment, an insulating ring is provided between the two exposed parts, and the outer diameter of the insulating ring is greater than the distance between the outermost side of the exposed part and the inner conductor 2-1.

[0060] In the specific implementation of Class 6-1, the exposed part is an exposed ring 8, and the distance between the outermost side of the exposed part and the inner conductor 2-1 is the outer diameter of the exposed ring 8, and the outer diameter of the insulating ring is larger than the outer diameter of the exposed ring 8. During the test, since the Rogowski coil is to be placed on the conductor to be tested, when the component supporting the Rogowski coil is a conductor, the two exposed rings 8 may be accidentally connected through the conductor. To avoid this phenomenon, an insulating ring is provided between the two exposed rings 8. Since the outer diameter of the insulating ring is larger, the insulating ring can contact the conductor in advance and separate the exposed ring 8 from the conductor, thereby avoiding accidental connection between the two exposed rings 8; at the same time, it can also avoid leakage due to one of the exposed rings 8 being connected to the conductor.

[0061] In the specific implementation manner of category 6-2, different from the specific implementation manner of category 6-1, the exposed part is a structure such as an exposed block or an exposed tube, and the number of various exposed parts can be one, or two, three or more arranged along the same circumference; in this case, the outer diameter of the insulating ring is larger than the distance from the outermost side of the exposed part to the inner conductor 2-1, that is, with the point on the inner conductor 2-1 as the center of the circle, the distance from the center of the circle to the outermost side of the exposed part is the outer diameter of the maximum circumference of the exposed part, and the outer diameter of the maximum circumference is smaller than the outer diameter of the insulating ring.

[0062] In the seventh embodiment, no insulating ring is provided between the exposed parts. Before measuring, the staff needs to carefully check whether the position of the Rogowski coil is appropriate to avoid leakage or short circuit.

[0063] Based on the specific implementation methods of Category 6, Figures 2 to 6 As shown, in order to better ensure that the conductive clamping structure is electrically connected to the exposed part, in the eighth embodiment, the conductive clamping structure further includes an arc-shaped positioning groove 5-1 that matches the insulating ring. When the exposed part is clamped by the conductive clamping structure, the insulating ring is located in the arc-shaped positioning groove 5-1 to form an insulating positioning ring 3 to ensure that the conductive clamping structure is electrically connected to the exposed part. By providing the arc-shaped positioning groove 5-1 and matching the arc-shaped positioning groove 5-1 with the insulating positioning ring 3, it is possible to ensure that the conductive clamping structure and the exposed part are in a specific relative position when the insulating positioning ring 3 is located in the arc-shaped positioning groove 5-1, thereby ensuring that the conductive clamping structure and the exposed part are electrically connected.

[0064] In the sixth embodiment, the arc-shaped positioning groove 5-1 may not be provided. In this case, during actual measurement, the staff needs to observe the relative position of the conductive clamping structure and the exposed part with the naked eye and manually adjust the position of the exposed part to ensure that the conductive clamping structure and the exposed part are conductively connected.

[0065] Based on the specific implementation methods of Category 6, Figures 2 to 6 As shown, in order to better fix the exposed parts, in the 9th specific implementation mode, the insulating ring is fixedly installed on the coil body 2, and the axial ends of the insulating ring are respectively fixedly connected to different exposed parts, so that the exposed parts can be better fixed by the insulating ring.

[0066] In the sixth embodiment, the insulating ring may not be in contact with the exposed part. In this case, the exposed part is only fixed on the outer jacket layer 2 - 5 .

[0067] It should be noted that the output voltage and current of the Rogowski coil are small. Even if the staff accidentally touches the live part of the Rogowski coil, it will not cause personal injury to the staff. At the same time, since the current in the conductor being measured is large, the staff needs to wear insulating gloves and other equipment when operating.

[0068] The specific embodiment of the electronic transformer provided by the present invention is as follows: like Figure 7 As shown, the electronic transformer includes a Rogowski coil. The main difference between the electronic transformer in the present invention and the existing electronic transformer is that the specific structure of the Rogowski coil is the same as the specific structure of any Rogowski coil in the specific embodiments of the Rogowski coil in the present invention, which will not be repeated here.

[0069] like Figure 7 As shown, the electronic mutual inductor also includes an integrator 11 and a display module 12. The integrator 11 is connected to the signal output line 4 of the Rogowski coil, so as to process the output current of the Rogowski coil. Specifically, the integrator 11 includes a signal conditioning circuit, an analog-to-digital conversion module and a communication module. The signal conditioning circuit amplifies, filters and performs noise reduction on the signal output by the Rogowski coil and the signal processed by the integrator 11, so that the final output signal meets the requirements of subsequent processing and transmission; the analog-to-digital conversion module is used to convert the conditioned analog signal into a digital signal, so that the digital system can perform subsequent processing and transmit the result to the communication module. The communication module is used to send data to the display module 12, so that the final result is displayed on the display module 12, which is convenient for the staff to observe the final result.

[0070] The communication module can also transmit data to a host computer or storage module or other equipment by wired or wireless means, thereby realizing data sharing, remote monitoring and storage. The display module 12 can adopt a commonly used display module 12 such as a liquid crystal display screen or a light emitting diode display screen.

[0071] The signal conditioning circuit can first amplify the signal to facilitate subsequent processing; then, the signal conditioning circuit can filter the signal to remove high-frequency noise and clutter in the signal and improve the quality and purity of the signal; finally, the signal conditioning circuit can reduce the noise of the signal, thereby reducing the random noise in the signal and further improving the quality and purity of the signal, making the signal more stable and reliable.

[0072] It should be noted that the present invention only classifies the specific embodiments according to specific features, which does not mean that other categories do not contain this specific feature. For example, the structure of the first category of specific embodiments may be the same as that of the second or third category of specific embodiments.

[0073] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions recorded in the aforementioned embodiments without creative work, or to replace some of the technical features therein with equivalents, or to organically combine different types of specific implementations, thereby combining the attached Figures 2 to 7 The specific implementation methods given in the specification are, of course, those skilled in the art can also combine the specific implementation methods not given in the other drawings of the specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A Rogowski coil, characterized in that: The invention comprises a coil body and a current-cutting structure, wherein the coil body comprises an inner conductor and an outer spiral wire, wherein one end of the inner conductor is connected to one end of the outer spiral wire to form a connecting portion, and the current-cutting structure is used to make the inner conductor and the outer spiral wire conduct in advance before the connecting portion, and the current-cutting structure comprises a conductive clamping structure and at least two length-adjusting portions arranged on the coil body, and all the length-adjusting portions are arranged at intervals along the length direction of the coil body, and each length-adjusting portion comprises two non-contacting exposed parts, wherein one exposed part is electrically connected to the inner conductor, and the other exposed part is electrically connected to the outer spiral wire, and the conductive clamping structure is used to simultaneously clamp the two exposed parts in any one of the length-adjusting portions, so that the inner conductor and the outer spiral wire can conduct in advance through the conductive clamping structure and the clamped length-adjusting portion.

2. The Rogowski coil according to claim 1, characterized in that: The exposed part is an exposed ring.

3. The Rogowski coil according to claim 2, characterized in that: The conductive clamping structure comprises two arc-shaped clamping jaws respectively used for clamping different exposed rings, and the two clamping jaws are conductively connected through a conductive member, thereby achieving early conduction of the inner conductor and the outer spiral wire.

4. The Rogowski coil according to claim 3, characterized in that: Each arc-shaped clamping jaw comprises an arc-shaped clamping jaw body and an arc-shaped electrical connection piece fixedly mounted on the inner surface of the clamping jaw body. The electrical connection piece is used for conductive connection with the exposed ring, and the conductive piece is used for electrically connecting the two electrical connections.

5. The Rogowski coil according to claim 3, characterized in that: The conductive clamping structure comprises an insulating clamping seat, two clamping claws are arranged on the insulating clamping seat, a mounting hole is arranged on the insulating clamping seat, two ends of the mounting hole extend to the two clamping claws respectively, and the conductive member is installed in the mounting hole.

6. The Rogowski coil according to any one of claims 1 to 5, characterized in that: An insulating ring is arranged between the two exposed parts, and the outer diameter of the insulating ring is greater than the distance between the outermost side of the exposed part and the inner conductor.

7. The Rogowski coil according to claim 6, characterized in that: The conductive clamping structure also includes an arc-shaped positioning groove matching the insulating ring. When the exposed part is clamped by the conductive clamping structure, the insulating ring is located in the arc-shaped positioning groove to form an insulating positioning ring to ensure that the conductive clamping structure is conductively connected to the exposed part.

8. The Rogowski coil according to claim 6, characterized in that: The insulating ring is fixedly mounted on the coil body, and two axial ends of the insulating ring are respectively fixedly connected to different exposed parts.

9. The Rogowski coil according to any one of claims 1 to 5, characterized in that: The Rogowski coil also includes a shell, one end of the coil body away from the connection portion is fixedly connected to the shell, and one end of the coil body away from the connection portion is connected to a signal output line for outputting the induced current to the outside.

10. An electronic mutual inductor, comprising a Rogowski coil, characterized in that: The Rogowski coil is the Rogowski coil according to any one of claims 1 to 9.

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