An alternating current transformer

Abstract

The application relates to the technical field of power detection, and discloses an alternating current transformer which comprises first and second clamping arms which are hinged, a first detection piece which is fixedly connected with the first clamping arm, and a second detection piece which is fixedly connected with the second clamping arm; the first detection piece is in abutment with the second detection piece to enclose a hollow cavity in a detection state, and the first detection piece and the second detection piece are separated in a normal state; in the detection state, the hollow cavity is used for being sleeved on the outer periphery of a line body to be detected; the first detection piece and the second detection piece are both used for being electrically connected with a testing instrument; the first detection piece comprises a first support, a first detection unit, a first auxiliary unit and a first winding, the second detection piece comprises a second support, a second detection unit, a second auxiliary unit and a second winding, the second detection winding is electrically connected with the first detection winding, and the second auxiliary winding is electrically connected with the first auxiliary winding; the excitation anas of each iron core are eliminated, and the influence of magnetic performance on the error of the alternating current transformer is improved.

Description

Technical Field

[0001] This invention relates to the technical field of power detection, and specifically to an AC transformer. Background Technology

[0002] In power systems, accurate measurement of high-voltage transmission line current is crucial. With the continuous development of the power industry, the requirements for the accuracy, safety, and convenience of current measurement are also increasing. Accurate measurement of high-voltage line current helps to monitor the real-time operating status of the power grid, ensuring the stable and reliable operation of the power system, and is of great significance to all aspects of power production, transmission, and distribution.

[0003] To solve the problem of current measurement in high-voltage lines, the conventional method mainly uses clamp-type AC transformers. The principle is that the conductor under test is placed in the transformer for current measurement by opening and closing the clamp-like structure. However, the core loss of the AC transformer is high after opening and closing, resulting in large errors and making online high-voltage testing impossible. Summary of the Invention

[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide an AC transformer.

[0005] This application provides an AC transformer, comprising: A first clamp arm and a second clamp arm, wherein the first clamp arm and the second clamp arm are hinged together; A first detection element and a second detection element are arranged opposite to each other. The first detection element is fixedly connected to the first clamp arm, and the second detection element is fixedly connected to the second clamp arm. The first detection element has a detection state in which it abuts against the second detection element to form a hollow cavity, and a normal state in which the first detection element and the second detection element are separated. In the detection state, the hollow cavity is used to be sleeved on the periphery of the line to be tested. Both the first and second detection components are used for electrical connection with the testing instrument; The first clamp arm rotates relative to the second clamp arm to switch between the detection state and the normal state; The first detection element includes a first bracket, a first detection unit, a first auxiliary unit, and a first winding. The first bracket has a first mounting cavity, and both the first detection unit and the first auxiliary unit are located within the first mounting cavity. The first winding is wound around the outer periphery of the first detection unit and the first auxiliary unit. The first detection unit includes a first main iron core and a first detection winding, with the first detection winding wound around the outer periphery of the first main iron core. The first auxiliary unit includes a first auxiliary iron core and a first auxiliary winding, with the first auxiliary winding wound around the outer periphery of the first auxiliary iron core. The second detection element includes a second bracket, a second detection unit, a second auxiliary unit, and a second winding. The second bracket has a second mounting cavity. The second detection unit and the second auxiliary unit are both located within the second mounting cavity. The second winding is wound around the outer periphery of the second detection unit and the second auxiliary unit, and is electrically connected to the first winding. The second detection unit includes a second main iron core and a second detection winding. The second detection winding is wound around the outer periphery of the second main iron core and is electrically connected to the first detection winding. The second auxiliary unit includes a second auxiliary iron core and a second auxiliary winding. The second auxiliary winding is wound around the outer periphery of the second auxiliary iron core and is electrically connected to the first auxiliary winding. The first detection winding, the second detection winding, the first auxiliary winding, the second auxiliary winding, the first winding, and the second winding are all used to connect to the testing instrument.

[0006] Beneficial effects: The first clamp arm rotates relative to the second clamp arm to switch to the detection state. At this time, the hollow cavity is fitted around the outer periphery of the wire body to be tested. The induced current signals generated on the first and second windings are transmitted to the testing instrument. The induced current signals generated on the first and second detection windings are also transmitted to the testing instrument. The testing instrument amplifies and compensates the current signals on the first and second detection windings and then sends them to the first and second auxiliary windings to eliminate the excitation ampere-turns in the first main core, second main core, first auxiliary core, and second auxiliary core, thereby changing the magnetic flux in each core. Then, the testing instrument again acquires the current signals on the first and second detection windings for detection. When the current signals on the first and second detection windings approach zero (this near-zero current in the first and second detection windings represents an ideal situation; in reality, there is negligible current in the first and second detection windings, and negligible magnetic flux still exists in the first main core, second main core, first auxiliary core, and second auxiliary core. These negligible magnetic fluxes and currents can be considered infinitely close to the ideal situation and approximated as zero), it indicates that the excitation ampere-turns in the cores have been eliminated. At this point, each core in the AC transformer will reach zero magnetic flux. The current signals transmitted from the first and second windings to the testing instrument can be calculated to obtain the current value in the conductor under test. This AC transformer, by acquiring the current signals from the first and second detection windings, amplifies and compensates these signals before transmitting them to the first and second auxiliary windings, thereby eliminating the excitation ampere-turns in each core, improving the influence of magnetic properties on the AC transformer error, and thus improving the measurement accuracy of the AC transformer. Furthermore, the AC transformer's performance remains stable after each use and opening / closing cycle.

[0007] In one optional embodiment, the first bracket includes a first epoxy resin skeleton and a first rubber shell, the first epoxy resin skeleton is located inside the first rubber shell, and the first epoxy resin skeleton has a first extension that penetrates through the first rubber shell, and one end of the first extension that extends out of the first rubber shell is fixedly connected to the first clamp arm. The second bracket includes a second epoxy resin skeleton and a second rubber shell. The second epoxy resin skeleton is located inside the second rubber shell, and the second epoxy resin skeleton has a second extension that penetrates through the second rubber shell. One end of the second extension that extends out of the second rubber shell is fixedly connected to the second clamp arm.

[0008] Beneficial Effects: The epoxy resin skeleton itself possesses excellent structural strength and rigidity, ensuring that the first and second supports meet the set structural strength and rigidity requirements. During testing, the first and second rubber shells abut against each other. Due to the plastic deformation of rubber, the first rubber shell can better adapt to the shape of the second rubber shell, thereby improving the tightness of the fit between the two shells and enhancing the sealing performance. This reduces gaps between the first and second rubber shells, mitigating the defect of easily punctured joints. The rubber shells also buffer the impact of external collisions and vibrations on internal components, reducing the risk of performance failure due to mechanical damage. Through the dual insulation protection of the epoxy resin skeleton and rubber shells, safety hazards caused by electrical insulation problems during AC transformer testing are reduced, improving electrical safety during use.

[0009] In one alternative embodiment, the first detection element further includes a first shielding layer located within the first mounting cavity, the first shielding layer enclosing the first detection unit, the first auxiliary unit, and the first winding.

[0010] Beneficial effects: The first shielding layer, encasing the first detection unit, the first auxiliary unit, and the first winding, effectively isolates electromagnetic signals from the external environment, reducing signal variations caused by electromagnetic interference. This provides more accurate raw data for subsequent signal processing and compensation calculations by testing instruments, thereby further improving the measurement accuracy of the AC transformer. Furthermore, it ensures that each winding maintains stable signal transmission performance under different environmental conditions, helping to maintain the performance consistency of the AC transformer in various application scenarios. Additionally, it prevents electromagnetic interference from the first detection unit, the first auxiliary unit, and the first winding to the outside world.

[0011] In one alternative embodiment, the second detection element further includes a second shielding layer located within the second mounting cavity, the second shielding layer enclosing the second detection unit, the second auxiliary unit, and the second winding.

[0012] Beneficial effects: The second shielding layer, encasing the second detection unit, the second auxiliary unit, and the second winding, effectively isolates electromagnetic signals from the external environment, reducing signal variations caused by electromagnetic interference. This provides more accurate raw data for subsequent signal processing and compensation calculations by testing instruments, further improving the measurement accuracy of the AC transformer. Furthermore, it ensures stable signal transmission performance for each winding under different environmental conditions, helping to maintain the performance consistency of the AC transformer across various application scenarios. Additionally, it prevents electromagnetic interference from the second detection unit, the second auxiliary unit, and the second winding to the outside world.

[0013] In one optional embodiment, the first shielding layer and the second shielding layer are both made of conductive materials, the first main iron core and the second main iron core are both made of microcrystalline materials, and the first auxiliary iron core and the second auxiliary iron core are both made of silicon steel sheets.

[0014] Beneficial Effects: Both the first and second shielding layers are made of conductive materials, providing excellent electromagnetic shielding performance and thus improving the ability to isolate external electromagnetic interference (such as stray electromagnetic fields generated by surrounding power equipment and cables). The first and second main iron cores are made of microcrystalline material, which has high permeability, low coercivity, and low loss characteristics. In detection mode, it can more sensitively sense current changes in the conductor under test, reducing the impact of the main iron core's own hysteresis loss on signal transmission. This ensures that the first and second detection windings can accurately sense changes in the magnetic flux of the main iron core, providing a more accurate basic induction signal for the testing instrument and improving the AC transformer's ability to detect weak currents and overall measurement accuracy. The first and second auxiliary iron cores are made of silicon steel sheets, which have good magnetic permeability, low iron loss, and high mechanical strength, making them suitable for stable operation in auxiliary compensation circuits. When the testing instrument transmits the compensation signal to the first auxiliary winding and the second auxiliary winding, the auxiliary iron core made of silicon steel sheet can efficiently respond to the magnetic field generated by the compensation current, and form a good match with the main iron core made of microcrystalline material, which can more effectively counteract the excitation ampere-turns in the main iron core, ensure the rapid establishment and stable maintenance of the "zero magnetic flux" state, and improve the effectiveness and reliability of the compensation mechanism.

[0015] In one alternative implementation, it further includes: An opening and closing drive component has its two ends hinged to the first clamp arm and the second clamp arm respectively, and the opening and closing drive component can drive the first clamp arm and the second clamp arm to rotate relative to each other; The return spring has its two ends fixedly connected to the first clamp arm and the second clamp arm, respectively.

[0016] Beneficial effects: The opening and closing drive mechanism rotates the first and second clamping arms relative to each other, switching between the detection and normal states. Compared to manual opening and closing, this reduces the intensity of manual operation. During the transition from the normal state to the detection state, the reset spring provides damping force, making the closing action of the first and second supports smoother and gentler, preventing violent collisions between the first and second detection components during docking due to excessive driving force or too rapid operation of the opening and closing drive mechanism.

[0017] In one alternative embodiment, a lifting drive component is further included, which is connected to the opening and closing drive component, and the lifting drive component is capable of driving the opening and closing drive component to move up and down.

[0018] In one alternative implementation, a fine-tuning component is also included, comprising: A horizontal plate with slotted holes. The base plate is fixedly connected to the strip-shaped hole by bolts; The column is fixedly connected at one end to the base plate and at the other end to the opening and closing drive component.

[0019] Beneficial effects: The fine-tuning component is connected to the base plate by bolts through the strip holes on the horizontal plate. This allows the base plate to be adjusted relative to the horizontal plate along the length of the strip holes. The column then drives the opening and closing drive to make fine adjustments to the position of the first and second supports.

[0020] In one optional embodiment, the lifting drive includes: The base has multiple casters at its bottom.

[0021] A scissor linkage mechanism is mounted on the base and connected to the horizontal plate; A hydraulic cylinder is used to drive the extension and retraction of the scissor linkage mechanism.

[0022] Beneficial effects: The lifting drive unit, through a scissor-link mechanism and hydraulic cylinder, can drive the horizontal plate and the overall structure connected above to achieve stable lifting and lowering, thereby flexibly adjusting the height of the AC transformer according to the height of the line under test. This allows the AC transformer to adapt to the height differences of the line under test in different installation environments (such as high and low voltage distribution cabinets, overhead cables, etc.), without the need for additional shims or movement of the device under test, significantly improving the equipment's adaptability and ease of operation. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a front view of the AC transformer of the present invention; Figure 2 This is a side view of the AC transformer of the present invention; Figure 3 This is a schematic diagram of the structure of the first clamp arm, the second clamp arm, the first detection element, and the second detection element in the AC transformer of the present invention. Figure 4 This is a cross-sectional view of the first bracket, the second bracket, the first extension, the second extension, and the test line in the AC transformer of the present invention; Figure 5 for Figure 2 Enlarged schematic diagram of partial cross-sectional view circle A; Figure 6 for Figure 1 Enlarged schematic diagram of partial cross-sectional view circle B; Figure 7 for Figure 5 A magnified view of a portion of the center circle C.

[0025] Explanation of reference numerals in the attached figures: 101. First clamp arm; 102. Second clamp arm; 201, First support; 2011, First epoxy resin skeleton; 2012, First rubber shell; 2013, First extension; 2021, First main iron core; 2022, First detection winding; 2031, First auxiliary iron core; 2032, First auxiliary winding; 204, First winding; 205, Second support; 2051, Second epoxy resin skeleton; 2052, Second rubber shell; 2053, Second extension; 301. First shielding layer; 401. Opening / closing drive component; 402. Return spring; 501. Base; 502. Roller; 503. Hydraulic cylinder; 504. Scissor linkage mechanism; 601. Horizontal plate; 602. Base plate; 603. Column; 701. Insulating sleeve; 702. Magnetic cylinder; 703. Pin; 704. Socket; 705. Lead wire; 706. Remote control; 707. Line to be tested. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other. Example

[0030] The AC transformer provided in the embodiments of this application, such as Figures 1 to 7 As shown, the device includes a first clamping arm 101, a second clamping arm 102, a first detection element, and a second detection element. The first clamping arm 101 and the second clamping arm 102 are hinged together. The first detection element is fixedly connected to the first clamping arm 101, and the second detection element is fixedly connected to the second clamping arm 102. The first clamping arm 101 can rotate relative to the second clamping arm 102, allowing switching between the detection state and normal state of the first and second detection elements. This facilitates the fitting of the test wire 707 for current measurement. This is because the hinged structure allows the first clamping arm 101 and the second clamping arm 102 to rotate flexibly, thereby enabling the opening and closing of the first and second detection elements.

[0031] Specifically, the first detection component includes a first support 201, a first detection unit, a first auxiliary unit, and a first winding 204. For example... Figure 3 and Figure 4 As shown, the first support 201 includes a first epoxy resin skeleton 2011 and a first rubber shell 2012. The first epoxy resin skeleton 2011 itself has good structural strength and rigidity, enabling the first support 201 to meet the set structural strength and rigidity requirements. The first epoxy resin skeleton 2011 is located inside the first rubber shell 2012 and has a first extension 2013. The first extension 2013 penetrates the first rubber shell 2012, and one end extending out of the first rubber shell 2012 is fixedly connected to the first clamp arm 101. The first rubber shell 2012 can be made of natural rubber or synthetic rubber, which has the characteristic of being able to produce plastic deformation, and can better adapt to the shape of other components in the detection state. The first epoxy resin skeleton 2011 can also be replaced by materials with high strength and rigidity, such as glass fiber reinforced plastic. The first rubber shell 2012 and the first extension 2013 are connected by a tight nesting method to ensure the stability of the connection. The first rubber shell 2012 is provided with a first mounting cavity, and the first detection unit and the first auxiliary unit are both located in the first mounting cavity; as Figure 5 and Figure 7 As shown, the first detection unit includes a first main iron core 2021 and a first detection winding 2022. The first main iron core 2021 is made of microcrystalline material, which has the characteristics of high magnetic permeability, low coercivity, and low loss, and can more sensitively sense the current change of the wire 707 under test. The first detection winding 2022 is wound around the outer periphery of the first main iron core 2021 and is used to sense the magnetic flux change of the first main iron core 2021. The first main iron core 2021 can also be replaced by materials with similar high magnetic permeability characteristics, such as permalloy. The first detection winding 2022 can be wound with copper wire, and the winding method can be adjusted according to actual needs. The first auxiliary unit includes a first auxiliary iron core 2031 and a first auxiliary winding 2032. The first auxiliary iron core 2031 is made of silicon steel sheet, which has good magnetic permeability and low iron loss, and high mechanical strength. The first auxiliary winding 2032 is wound around the outer periphery of the first auxiliary iron core 2031. When the testing instrument transmits a compensation signal, it can efficiently respond to the magnetic field generated by the compensation current. The first auxiliary iron core 2031 can also be replaced by materials with good magnetic permeability, such as ferrite. The first auxiliary winding 2032 can also be wound with copper wire. The first winding 204 is wound around the outer periphery of the first detection unit and the first auxiliary unit. It is in close contact with the first detection unit and the first auxiliary unit to ensure accurate sensing of relevant magnetic field changes. The first winding 204 can be wound with multi-strand copper wire to improve the sensing effect. These components are combined so that the first detection unit can accurately sense the current change of the wire under test 707, the first auxiliary unit cooperates with the first detection unit under the action of the compensation signal of the testing instrument, and the first winding 204 transmits the sensed signal to achieve preliminary detection of the current and signal transmission.

[0032] Specifically, the second detection component includes a second bracket 205, a second detection unit, a second auxiliary unit, and a second winding. For example... Figure 3 and Figure 4As shown, the second bracket 205 includes a second epoxy resin skeleton 2051 and a second rubber shell 2052. The second epoxy resin skeleton 2051 is located inside the second rubber shell 2052 and has a second extension 2053. The second extension 2053 penetrates the second rubber shell 2052, and one end extending out of the second rubber shell 2052 is fixedly connected to the second clamp arm 102. Its function and structural characteristics are the same as those of the first bracket 201, ensuring structural strength and rigidity while improving fit and sealing performance. The second rubber shell 2052 is provided with a second mounting cavity, in which the second detection unit and the second auxiliary unit are both located. The materials and connection methods of the second epoxy resin skeleton 2051 and the second rubber shell 2052 are the same as those of the corresponding parts of the first bracket 201, and similar alternative materials can also be used. The first epoxy resin skeleton 2011 has an insertion part that extends beyond the first rubber shell 2012. The second epoxy resin skeleton 2051 has a groove, and the second rubber shell 2052 has an opening to expose the groove. In the detection state, the insertion part is in contact with the inner wall of the groove. The creepage distance at the joint between the insertion part and the groove is L1+L2+L2+L3+L4 to extend the breakdown path and avoid breakdown by high voltage on the wire under test 707. H1 is the air distance, i.e., the distance between the wire under test and the inner wall of the hollow cavity. The second detection unit includes a second main iron core and a second detection winding. The second main iron core is made of microcrystalline material, and the second detection winding is wound around the outer periphery of the second main iron core. It cooperates with the structure and function of the first detection unit to sense the current of the wire under test 707. The material and winding method of the second main iron core and the second detection winding are the same as the corresponding parts of the first detection unit, or similar alternative materials can be used. The second auxiliary unit includes a second auxiliary core and a second auxiliary winding. The second auxiliary core is made of silicon steel sheet, and the second auxiliary winding is wound around the outer periphery of the second auxiliary core. It works in conjunction with the first auxiliary unit to respond to the magnetic field generated by the compensation current. The materials and winding method of the second auxiliary core and the second auxiliary winding are the same as the corresponding parts of the first auxiliary unit, or similar alternative materials can be used. The second winding is wound around the outer periphery of the second detection unit and the second auxiliary unit, and is electrically connected to the first winding 204, enabling the integration and transmission of the sensed signal and the signal from the first winding 204. The winding method and material of the second winding are the same as those of the first winding 204. The first main iron core 2021 and the second main iron core are both made of two semi-circular toroidal iron cores. The first auxiliary iron core 2031 and the second auxiliary iron core are both made of two semi-circular toroidal iron cores. The first main iron core 2021 and the second main iron core are made by cutting the main iron core in half. The first auxiliary iron core 2031 and the second auxiliary iron core are made by cutting the auxiliary iron core in half. After the main iron core is cut, the permeability decreases by 80-90%. After the auxiliary iron core is cut, the permeability decreases by 40-60%.When the permeability of the iron core drops significantly after the core is opened, resulting in very poor current transformer error, a double-core zero-flux magnetomotive force compensation method is used to overcome the defect of extremely large AC current transformer error caused by the sharp drop in the magnetic properties of the iron core after the core is opened. The first detection winding 2022, the second detection winding, the first auxiliary winding 2032, the second auxiliary winding, the first winding 204, and the second winding are all used to connect to the testing instrument. The first detection winding 2022 is connected to the second detection winding, the first auxiliary winding 2032 is connected to the second auxiliary winding, and the first winding 204 is connected to the second winding. In the detection state, the induced current signal generated on the first winding 204 and the second winding is transmitted to the testing instrument. The induced current signal generated on the first detection winding 2022 and the second detection winding is also transmitted to the testing instrument. The testing instrument amplifies and compensates the current signal on the first detection winding 2022 and the second detection winding and then sends it to the first auxiliary winding 2032 and the second auxiliary winding to eliminate the excitation ampere-turns in the first main iron core 2021, the second main iron core, the first auxiliary iron core 2031, and the second auxiliary iron core, so that each iron core reaches zero magnetic flux. At this time, the current signal transmitted to the testing instrument by the first winding 204 and the second winding can be calculated to obtain the current value in the wire body 707 under test. The testing instrument is equipped with a supplementary amplification module to amplify the current signal and calculate the compensated current signal value to output a supplementary current signal. The testing instrument is also equipped with a calculation module to calculate the required current value according to the input current signal and a set algorithm.

[0033] In this embodiment, the first detection element further includes a first shielding layer 301, which is located within the first mounting cavity. The first shielding layer 301 encloses the first detection unit, the first auxiliary unit, and the first winding 204. Enclosing the first detection unit, the first auxiliary unit, and the first winding 204 effectively isolates electromagnetic signals from the external environment, reduces signal variations caused by electromagnetic interference, and provides more accurate raw data for subsequent signal processing and compensation calculations by testing instruments, thereby further improving the measurement accuracy of the AC transformer. Furthermore, it ensures that each winding maintains stable signal transmission performance under different environmental conditions, helping to maintain the performance consistency of the AC transformer in various application scenarios. Additionally, it also prevents electromagnetic interference from the first detection unit, the first auxiliary unit, and the first winding 204 to the outside world.

[0034] In this embodiment, the second detection element further includes a second shielding layer located within the second mounting cavity. The second shielding layer encloses the second detection unit, the second auxiliary unit, and the second winding. Enclosing the second detection unit, the second auxiliary unit, and the second winding effectively isolates electromagnetic signals from the external environment, reducing signal variations caused by electromagnetic interference. This provides more accurate raw data for subsequent signal processing and compensation calculations by testing instruments, further improving the measurement accuracy of the AC transformer. Furthermore, it ensures that each winding maintains stable signal transmission performance under different environmental conditions, helping to maintain the performance consistency of the AC transformer in various application scenarios. Additionally, it prevents electromagnetic interference from the second detection unit, the second auxiliary unit, and the second winding to the outside world.

[0035] In this embodiment, both the first shielding layer 301 and the second shielding layer are made of conductive materials. The use of conductive materials in both the first shielding layer 301 and the second shielding layer can provide good electromagnetic shielding performance, thereby improving the ability to isolate external electromagnetic interference (such as stray electromagnetic fields generated by surrounding power equipment and cables).

[0036] The implementation principle of this embodiment is as follows: The AC transformer achieves the opening and closing of the first and second detection elements through the hinged structure of the first clamp arm 101 and the second clamp arm 102, facilitating the mounting of the test wire 707. The units and windings in the first and second detection elements cooperate with each other, utilizing a main iron core made of microcrystalline material and an auxiliary iron core made of silicon steel sheet, combined with the compensation mechanism of the testing instrument, to eliminate the excitation ampere-turns in the iron core, improving the influence of magnetic properties on the error of the AC transformer, thereby improving the measurement accuracy of the AC transformer. Furthermore, the performance remains stable after each opening and closing, solving the problem of large iron core loss and large error after opening and closing in existing AC transformers, improving the accuracy and reliability of power detection, and making a significant improvement and contribution to existing technology. Example

[0037] The difference between this embodiment and the above embodiments is that: Figure 1 and Figure 2As shown, it also includes an opening / closing drive component 401, a return spring 402, a lifting drive component, and a fine-tuning assembly. The opening / closing drive component 401 is hinged at both ends to the first clamping arm 101 and the second clamping arm 102, respectively. The opening / closing drive component 401 can be an electric push rod or similar device, which drives the first clamping arm 101 and the second clamping arm 102 to rotate relative to each other, switching between the detection state and the normal state, reducing the intensity of manual operation. The opening / closing drive component 401 can also be replaced by a hydraulic cylinder or other component with a driving function. The return spring 402 is fixedly connected at both ends to the first clamping arm 101 and the second clamping arm 102, respectively. During the switch from the normal state to the detection state, the return spring 402 provides damping force, making the closing action of the first support 201 and the second support 205 smoother and gentler, avoiding violent collisions between the first and second detection components during docking due to excessive driving force or excessively fast operation of the opening / closing drive component 401. The return spring 402 can be a helical spring or a disc spring or other component with elastic buffering function. The lifting drive component includes a base 501, a scissor linkage mechanism 504, and a hydraulic cylinder 503. The base 501 has multiple rollers 502 at its bottom for easy equipment movement. The scissor linkage mechanism 504 is mounted on the base 501 and connected to the horizontal plate 601. The hydraulic cylinder 503 drives the scissor linkage to extend and retract. Through the cooperation of the scissor linkage mechanism 504 and the hydraulic cylinder 503, the horizontal plate 601 and the connected structure above it can be driven to achieve stable lifting and lowering, allowing for flexible adjustment of the AC transformer's height position according to the height of the test line 707. The scissor linkage mechanism 504 can also be replaced by a telescopic sleeve or other structure with lifting functionality. The fine-tuning component includes a horizontal plate 601, a base plate 602, and a column 603. The horizontal plate 601 has multiple slotted holes. The base plate 602 is fixedly connected to the slotted holes by bolts. One end of the column 603 is fixedly connected to the base plate 602, and the other end is fixedly connected to the opening and closing drive component 401. The fine-tuning component is connected to the base plate 602 by bolts through the strip hole on the horizontal plate 601. This allows the base plate 602 to be adjusted relative to the horizontal plate 601 in the length direction of the strip hole. Then, the column 603 drives the opening and closing drive component 401 to make fine-tuning adjustments, thereby adjusting the positions of the first bracket 201 and the second bracket 205.

[0038] The implementation principle of this embodiment is as follows: the opening and closing drive component 401 enables automatic switching of the AC transformer's opening and closing states, reducing manual operation. The reset spring 402 ensures the smoothness of the opening and closing process, preventing damage from component collisions. The lifting drive component and fine-tuning assembly allow the AC transformer to be flexibly adjusted according to different usage scenarios and the position of the line under test 707, improving the device's scenario adaptability and operational convenience, further enhancing the practicality and performance of the AC transformer, and representing a further improvement and optimization of the existing technology.

[0039] In this embodiment, as Figure 6As shown, it also includes an insulating sleeve 701, a magnetic cylinder 702, a pin 703, a socket 704, and a lead wire 705. The column 603 has a hollow section, the cylindrical part of which is the insulating sleeve 701. The magnetic cylinder 702 is disposed inside the hollow section, and the telescopic end of the magnetic cylinder 702 is fixedly connected to a copper plate. The copper plate is provided with a socket 704, and the copper plate is connected to an external testing instrument through various wires. The pin 703 is made of conductive material and is fixedly connected to the bottom of the hollow section. The pin 703 is connected to the first winding 204, the first detection winding 2022, and the first auxiliary winding 2032 respectively via each lead 705. The first winding 204 and the second winding are connected in series, the first detection winding 2022 and the second detection winding are connected in series, and the first auxiliary winding 2032 and the second auxiliary winding are connected in series. The magnetic cylinder 702 extends and retracts to move the socket 704 closer to or further away from the pin 703, thereby realizing the switching of electrical signals between each winding and the test instrument.

[0040] In this embodiment, as Figure 1 and Figure 2 As shown, it also includes a remote controller 706, which is connected to the opening / closing drive unit 401 and the lifting drive unit via signal connection, for example, through WiFi or Bluetooth. The remote controller 706 can control the opening / closing drive unit 401 and the lifting drive unit to work.

[0041] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An AC current transformer, characterized in that, include: The first clamp arm (101) and the second clamp arm (102) are hinged together; The first and second detection components are arranged opposite to each other. The first detection component is fixedly connected to the first clamp arm (101), and the second detection component is fixedly connected to the second clamp arm (102). The first detection component has a detection state in which it abuts against the second detection component to form a hollow cavity, and a normal state in which the first detection component and the second detection component are separated. In the detection state, the hollow cavity is used to be fitted around the outer periphery of the test line (707); Both the first and second detection components are used for electrical connection with the testing instrument; The first clamp arm (101) rotates relative to the second clamp arm (102) to switch between the detection state and the normal state; The first detection element includes a first bracket (201), a first detection unit, a first auxiliary unit, and a first winding (204). The first bracket (201) has a first mounting cavity. The first detection unit and the first auxiliary unit are both located in the first mounting cavity. The first winding (204) is wound around the outer periphery of the first detection unit and the first auxiliary unit. The first detection unit includes a first main iron core (2021) and a first detection winding (2022). The first detection winding (2022) is wound around the outer periphery of the first main iron core (2021). The first auxiliary unit includes a first auxiliary iron core (2031) and a first auxiliary winding (2032). The first auxiliary winding (2032) is wound around the outer periphery of the first auxiliary iron core (2031). The second detection component includes a second bracket (205), a second detection unit, a second auxiliary unit, and a second winding. The second bracket (205) has a second mounting cavity. The second detection unit and the second auxiliary unit are both located in the second mounting cavity. The second winding is wound around the outer periphery of the second detection unit and the second auxiliary unit, and the second winding is electrically connected to the first winding (204). The second detection unit includes a second main iron core and a second detection winding. The second detection winding is wound around the outer periphery of the second main iron core, and the second detection winding is electrically connected to the first detection winding (2022). The second auxiliary unit includes a second auxiliary iron core and a second auxiliary winding. The second auxiliary winding is wound around the outer periphery of the second auxiliary iron core and is electrically connected to the first auxiliary winding (2032). The first detection winding (2022), the second detection winding, the first auxiliary winding (2032), the second auxiliary winding, the first winding (204), and the second winding are all used to connect the test instrument.

2. The AC transformer according to claim 1, characterized in that, The first bracket (201) includes a first epoxy resin skeleton (2011) and a first rubber shell (2012). The first epoxy resin skeleton (2011) is located inside the first rubber shell (2012), and the first epoxy resin skeleton (2011) has a first extension (2013). The first extension (2013) penetrates the first rubber shell (2012), and one end of the first extension (2013) extending out of the first rubber shell (2012) is fixedly connected to the first clamp arm (101). The second bracket (205) includes a second epoxy resin skeleton (2051) and a second rubber shell (2052). The second epoxy resin skeleton (2051) is located inside the second rubber shell (2052), and the second epoxy resin skeleton (2051) has a second extension (2053). The second extension (2053) penetrates the second rubber shell (2052), and one end of the second extension (2053) extending out of the second rubber shell (2052) is fixedly connected to the second clamp arm (102).

3. The AC transformer according to claim 2, characterized in that, The first detection element further includes a first shielding layer (301), which is located inside the first mounting cavity and encloses the first detection unit, the first auxiliary unit, and the first winding (204).

4. The AC transformer according to claim 3, characterized in that, The second detection element further includes a second shielding layer, which is located inside the second mounting cavity and encloses the second detection unit, the second auxiliary unit, and the second winding.

5. The AC transformer according to claim 4, characterized in that, The first shielding layer (301) and the second shielding layer are both made of conductive materials, the first main iron core (2021) and the second main iron core are both made of microcrystalline materials, and the first auxiliary iron core (2031) and the second auxiliary iron core are both made of silicon steel sheets.

6. The AC transformer according to any one of claims 1-5, characterized in that, Also includes: The opening and closing drive member (401) has its two ends hinged to the first clamp arm (101) and the second clamp arm (102) respectively. The opening and closing drive member (401) can drive the first clamp arm (101) and the second clamp arm (102) to rotate relative to each other. The return spring (402) is fixedly connected at both ends to the first clamp arm (101) and the second clamp arm (102), respectively.

7. The AC transformer according to claim 6, characterized in that, It also includes a lifting drive component, which is connected to the opening and closing drive component (401), and the lifting drive component can drive the opening and closing drive component (401) to rise and fall.

8. The AC transformer according to claim 7, characterized in that, It also includes fine-tuning components, which include: A horizontal plate (601) has a strip hole on it; The base plate (602) is fixedly connected to the strip hole by bolts; The column (603) is fixedly connected at one end to the base plate (602) and at the other end to the opening and closing drive component (401).

9. The AC transformer according to claim 8, characterized in that, The lifting drive component includes: The base (501) has multiple casters (502) at its bottom; A scissor linkage mechanism (504) is mounted on the base (501) and connected to the horizontal plate (601); A hydraulic cylinder (503) is used to drive the scissor linkage mechanism (504) to extend and retract.

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