Current transformer convenient to install outdoors
By integrating the current supply mechanism and the triggering mechanism into the current transformer, current measurement and automatic circuit breaking protection are integrated, solving the problem of insufficient self-protection of outdoor current transformers, improving the convenience and safety of the equipment, and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-03-27
AI Technical Summary
Outdoor current transformers lack self-protection functions, resulting in complex structures, difficult installation, slow operation, high maintenance costs, and the risk of damage.
The current transformer integrates a current supply mechanism and a triggering mechanism, and achieves automatic circuit breaking protection through electromagnetic induction. It utilizes the magnetic field generated by the helical section to drive mechanical linkage, quickly switching the main and auxiliary contacts, and realizing the integration of current measurement and protection.
It improves the convenience and safety of outdoor applications, reduces the intensity of maintenance work, avoids damage due to overcurrent, has a compact structure, is adaptable to harsh environments, and reduces installation space and equipment costs.
Smart Images
Figure CN121748148A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of current transformers, and more particularly to a current transformer convenient for outdoor installation. BACKGROUND
[0002] The current transformer is one of the core devices for current measurement, energy metering and relay protection in the power system, and its performance and reliability are directly related to the safe and stable operation of the power grid. In outdoor distribution lines, pole-mounted switches, box-type substations and other open-air places, the installation and operating environment of the current transformer is particularly complex, often facing the adverse factors of sun, rain, temperature change, dust corrosion, etc.
[0003] At present, most of the outdoor current transformers only have current conversion function, and do not integrate overcurrent protection mechanism. When the line has short circuit or overload fault, the external circuit breaker, fuse or protection relay must be relied on to realize the breaking protection. This kind of discrete protection scheme has obvious shortcomings. On the one hand, it increases the complexity of the system structure and the installation space requirement, and it is difficult to layout in the space-limited outdoor tower or compact distribution box. On the other hand, there is a difference in action time sequence between the internal and external equipment, which may lead to insufficient protection action speed or insufficient selectivity, so that the transformer still has the risk of damage when subjected to a large current impact, affecting the measurement accuracy and even causing secondary faults. In addition, the outdoor equipment maintenance cost is high, and the period is long. The traditional external protection element is not convenient to replace after damage. Therefore, the industry urgently needs a current transformer that integrates measurement and self-protection functions, has compact structure, adapts to harsh outdoor environment and does not need frequent maintenance, to improve the overall reliability of outdoor power equipment, simplify the installation process and reduce the operation and maintenance cost. SUMMARY
[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides a current transformer convenient for outdoor installation to solve the problems existing in the above background art.
[0005] The present application provides the following technical scheme: a current transformer convenient for outdoor installation, comprising a current transformer body, a wiring terminal one and a wiring terminal two are arranged on the current transformer body, an extension slot is also formed on the current transformer body, a flow sending mechanism and a triggering mechanism are installed in the extension slot, the flow sending mechanism has an on state and an off state, the on state of the flow sending mechanism is used to connect the wiring terminal one and the wiring terminal two, the off state of the flow sending mechanism is used to cut off the path of the wiring terminal one and the wiring terminal two, and the triggering mechanism is used to switch the flow sending mechanism from the on state to the off state when the current abnormally increases.
[0006] Preferably, the flow sending mechanism comprises a conductive rod one, a rotating shaft, a conductive rod two and a conductive rod three, the conductive rod one and the conductive rod three are fixedly installed in the extension groove, the rotating shaft is rotatably installed in the extension groove, and the surface of the rotating shaft is sleeved with a coil spring.
[0007] Preferably, the conductive rod one is provided with a spiral section, one end of the conductive rod one is connected with the terminal one, and the other end of the conductive rod one is rotatably installed on the surface of the rotating shaft.
[0008] Preferably, one end of the conductive rod two is fixedly installed on the surface of the rotating shaft, the other end of the conductive rod two is provided with a main contact, one end of the conductive rod three is provided with a secondary contact, the secondary contact is matched with the main contact, and the other end of the conductive rod three is connected with the terminal two.
[0009] Preferably, the trigger mechanism comprises a bent frame, a fixed frame, a bearing frame, a moving rod and a guide rod, one end of the bent frame is fixedly connected with a magnet, and the other end of the bent frame is fixedly connected with a first connecting frame.
[0010] Preferably, the fixed frame is fixedly installed in the extension groove, the fixed frame is fixedly connected with a guide strip, the bent frame is fixedly connected with a guide block, and the guide block is sleeved on the surface of the guide strip.
[0011] Preferably, the bearing frame is fixedly connected with a second connecting frame, a connecting rod is arranged between the second connecting frame and the first connecting frame, one end of the connecting rod is hingedly connected with the first connecting frame, and the other end of the connecting rod is hingedly connected with the second connecting frame.
[0012] Preferably, the moving rod is fixedly connected with the bearing frame, one end of the moving rod is fixedly connected with a U-shaped claw, and the other end of the moving rod is fixedly connected with a guide block.
[0013] Preferably, the guide rod is fixedly installed in the extension groove, the guide block is sleeved on the surface of the guide rod, and a compression spring is sleeved on the surface of the guide rod.
[0014] Preferably, a cover plate is arranged at the opening of the extension groove, and the cover plate and the current transformer body are fixedly connected through bolts.
[0015] The beneficial effects of the application are as follows: The current transformer convenient for outdoor installation provided by the application realizes the integration of current measurement and built-in automatic circuit protection by integrating a current feeding mechanism and an electromagnetic induction type trigger mechanism in the body, and significantly improves the convenience and safety of outdoor application. Specifically, the built-in current feeding mechanism of the transformer maintains stable conduction during normal operation, ensuring low-loss transmission and high-precision measurement of the current signal. When an abnormally large current appears in the line, the current flowing through the spiral section generates a transient enhanced magnetic field, driving the trigger mechanism to act, rapidly releasing the coil spring through mechanical linkage, so that the main and auxiliary contacts are separated, thereby quickly realizing automatic switching from connection to disconnection, effectively preventing the transformer from burning due to overcurrent, improving the survival ability of the equipment itself. In addition, the entire protection structure is completely embedded in the extension groove of the transformer body, which is compact in structure and good in sealing, sealed by the cover plate, has good dustproof, moistureproof and weatherproof performance, is very suitable for outdoor installation in harsh environments, and does not need to additionally configure an external protection switch, saving installation space and equipment cost. In addition, the mechanism action is reliable and convenient to reset, and after troubleshooting, the cover plate is opened for simple operation to restore the contact connection, which is convenient to maintain and reduces the work intensity of outdoor inspection and maintenance. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.
[0017] Fig. 1 It is a schematic diagram of the overall structure of the application.
[0018] Fig. 2 It is a schematic diagram of the internal structure of the extension groove of the application.
[0019] Fig. 3 It is a schematic diagram of the current feeding mechanism and the trigger mechanism structure of the application.
[0020] Fig. 4 It is a schematic diagram of the current feeding mechanism structure of the application.
[0021] Fig. 5 It is a schematic diagram of the trigger mechanism structure of the application.
[0022] Fig. 6 It is a schematic diagram of the trigger mechanism structure of the application.
[0023] The reference signs are: 1, current transformer body; 11, wiring terminal one; 12, wiring terminal two; 13, extension groove; 14, cover plate; 2, current sending mechanism; 21, conductive rod one; 211, spiral section; 22, rotating shaft; 221, winding spring; 23, conductive rod two; 231, main contact; 24, conductive rod three; 241, auxiliary contact; 3, triggering mechanism; 31, bent frame; 311, first connecting frame; 312, guide block; 32, magnet; 33, fixed frame; 331, guide strip; 34, connecting rod; 35, receiving frame; 351, second connecting frame; 36, moving rod; 361, U-shaped claw; 362, guide block; 37, guide rod; 371, compression spring. DETAILED DESCRIPTION
[0024] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0025] Referring to Figs. 1 to 3 , the present application provides a current transformer convenient for outdoor installation, comprising a current transformer body 1, the current transformer body 1 is provided with a wiring terminal one 11 and a wiring terminal two 12, the current transformer body 1 is also provided with an extension groove 13, the extension groove 13 is installed with a current sending mechanism 2 and a triggering mechanism 3, the current sending mechanism 2 is provided with an on state and an off state, the on state of the current sending mechanism 2 is used to connect the wiring terminal one 11 and the wiring terminal two 12, the off state of the current sending mechanism 2 is used to cut off the path of the wiring terminal one 11 and the wiring terminal two 12, and the triggering mechanism 3 is used to switch the current sending mechanism 2 from the on state to the off state when the current abnormally increases.
[0026] Referring to Figs. 1 to 4 , the current sending mechanism 2 comprises a conductive rod one 21, a rotating shaft 22, a conductive rod two 23 and a conductive rod three 24, the conductive rod one 21 and the conductive rod three 24 are both fixedly installed in the extension groove 13, the rotating shaft 22 is rotatably installed in the extension groove 13, and the rotating shaft 22 is provided on the surface with a winding spring 221.
[0027] Further, the conductive rod one 21 is provided with a spiral section 211, one end of the conductive rod one 21 is connected with the wiring terminal one 11, the other end of the conductive rod one 21 is rotatably installed on the surface of the rotating shaft 22, one end of the conductive rod two 23 is fixedly installed on the surface of the rotating shaft 22, the other end of the conductive rod two 23 is provided with a main contact 231, one end of the conductive rod three 24 is provided with an auxiliary contact 241, the auxiliary contact 241 is matched with the main contact 231, and the other end of the conductive rod three 24 is connected with the wiring terminal two 12.
[0028] In use, under normal current size, the trigger mechanism 3 limits the conductive rod two 23, the elastic force of the coil spring 221 cannot be released, the main contact 231 and the auxiliary contact 241 are closely attached, the current sending mechanism 2 is in the on state, the current is input from the terminal one 11 to the current transformer body 1, then the current passes through the conductive rod one 21, the conductive rod two 23 and the conductive rod three 24 in turn, and the current is output outward from the terminal two 12. When the current instantaneously abnormally increases, the magnetic field strength generated by the current flowing through the spiral section 211 instantaneously increases, the magnetic field force generated by the magnetic field drives the trigger mechanism 3 to act, the trigger mechanism 3 releases the restriction on the conductive rod two 23, the elastic force of the coil spring 221 is instantaneously released, the elastic force of the coil spring 221 drives the conductive rod two 23 to rotate around the axis of the rotating shaft 22, the main contact 231 on the conductive rod two 23 and the auxiliary contact 241 on the conductive rod three 24 are separated, at this time, the current sending mechanism 2 is switched from the on state to the off state.
[0029] In summary, the current sending mechanism 2 constructs a stable and reliable on-off switching mechanism through the arrangement of the conductive rod one 21, the conductive rod two 23 and the conductive rod three 24, and the cooperation of the rotating shaft 22 and the coil spring 221. Under normal working conditions, the conductive rod two 23 is constrained by the trigger mechanism 3, the main contact 231 and the auxiliary contact 241 maintain close contact, forming a low resistance path, ensuring high fidelity transmission of the current signal and measurement accuracy. When abnormal current occurs, the trigger mechanism 3 releases the constraint, the elastic potential energy accumulated in the coil spring 221 is rapidly released, driving the conductive rod two 23 to rotate around the shaft, so that the main and auxiliary contacts are quickly separated, thereby realizing the rapid cutting of the circuit. The mechanism is embedded in the current transformer body, compact structure, decisive action, no external electrical drive, especially suitable for integration in space-limited and complex environment outdoor occasions, avoiding the safety hazards caused by improper cooperation or installation of external protection equipment.
[0030] Reference Figs. 1 to 6 The trigger mechanism 3 includes a bent frame 31, a fixed frame 33, a receiving frame 35, a moving rod 36 and a guide rod 37, one end of the bent frame 31 is fixedly connected with a magnet 32, the other end of the bent frame 31 is fixedly connected with a first connecting frame 311, the fixed frame 33 is fixedly installed in the extension groove 13, the fixed frame 33 is fixedly connected with a guide strip 331, the bent frame 31 is fixedly connected with a guide block 312, and the guide block 312 is sleeved on the surface of the guide strip 331.
[0031] Further, the second connecting frame 351 is fixedly connected to the receiving frame 35, and a connecting rod 34 is arranged between the first connecting frame 311 and the second connecting frame 351, one end of the connecting rod 34 is hingedly connected to the first connecting frame 311, the other end of the connecting rod 34 is hingedly connected to the second connecting frame 351, a moving rod 36 is fixedly connected between the receiving frame 35, one end of the moving rod 36 is fixedly connected with a U-shaped claw 361, the other end of the moving rod 36 is fixedly connected with a guide block 362, a guide rod 37 is fixedly installed in the extension slot 13, the guide block 362 is sleeved on the surface of the guide rod 37, and a compression spring 371 is sleeved on the surface of the guide rod 37.
[0032] Further, the extension slot 13 is provided with a cover plate 14, and the cover plate 14 is fixedly connected to the current transformer body 1 by bolts.
[0033] In use, under normal current size, the U-shaped claw 361 is sleeved on the surface of the conductive rod two 23, the elastic force of the coil spring 221 cannot be released, the main contact 231 is tightly attached to the auxiliary contact 241, and the current feeding mechanism 2 is in the on state. When the current instantaneously abnormally increases, the magnetic field strength generated by the current flowing through the spiral section 211 instantaneously increases, the magnetic field force generated by the magnetic field drives the magnet 32 to move away from the spiral section 211, the bending frame 31 and the guide block 312 synchronously slide along the guide strip 331 as a whole, the bending frame 31 moves and drives the receiving frame 35 to synchronously move towards the cover plate 14 through the first connecting frame 311, the connecting rod 34 and the second connecting frame 351, the receiving frame 35 moves and drives the moving rod 36 and the guide block 362 to synchronously slide along the guide rod 37 as a whole against the elastic force of the compression spring 371, the U-shaped claw 361 also synchronously moves with the moving rod 36, the U-shaped claw 361 is separated from the conductive rod two 23, the elastic force of the coil spring 221 is instantaneously released, the elastic force of the coil spring 221 drives the conductive rod two 23 to rotate around the rotating shaft 22, the main contact 231 on the conductive rod two 23 is separated from the auxiliary contact 241 on the conductive rod three 24, at this time, the current feeding mechanism 2 is switched from the on state to the off state.
[0034] In summary, the trigger mechanism 3 realizes autonomous perception and rapid response to abnormal current based on electromagnetic induction and mechanical transmission. The core is the interaction between the magnetic field generated by the current-carrying helical segment 211 and the magnet 32. Under normal current, the magnetic field force is weak, and the mechanism remains stationary. Once the current abnormally increases, the helical segment 211 magnetic field is enhanced, repelling the magnet 32 to drive the bent frame 31 to slide along the guide bar 331, and then through the connecting rod structure, the linear motion is converted into the lifting action of the motion rod 36 and the U-shaped claw 361. The moment the U-shaped claw 361 is separated from the conductive rod two 23, the winding spring 221 loses the limit of rotation, and the circuit breaking operation is completed. The entire triggering process is completely driven by the current itself without the need for external power supply. The mechanical linkage structure is simple and durable. The mechanism is sealed in the extension groove 13, and the cover plate 14 further enhances its dustproof, moistureproof and anti-vibration ability, meeting the requirements of outdoor equipment for all-weather reliable operation.
[0035] The working principle of the present application is as follows: under normal current, the U-shaped claw 361 is sleeved on the surface of the conductive rod two 23, the elastic force of the winding spring 221 cannot be released, the main contact 231 and the auxiliary contact 241 are tightly attached, the current flows from the wiring terminal one 11 to the current transformer body 1, and then the current flows through the conductive rod one 21, the conductive rod two 23 and the conductive rod three 24, and the current is outputted from the wiring terminal two 12.
[0036] When the current abnormally increases instantaneously, the magnetic field strength generated by the current flowing through the helical segment 211 instantaneously increases, the magnetic field force generated by the magnetic field drives the magnet 32 to move away from the helical segment 211, the bent frame 31 and the guide block 312 slide synchronously along the guide bar 331, the bent frame 31 moves and drives the receiving frame 35 to move synchronously towards the cover plate 14 through the first adapter frame 311, the connecting rod 34 and the second adapter frame 351, the receiving frame 35 moves and drives the motion rod 36 and the guide block 362 to slide synchronously along the guide rod 37 against the elastic force of the compression spring 371, the U-shaped claw 361 also moves synchronously with the motion rod 36, the U-shaped claw 361 is separated from the conductive rod two 23, the elastic force of the winding spring 221 is released instantaneously, the elastic force of the winding spring 221 drives the conductive rod two 23 to rotate around the rotation axis 22, the main contact 231 on the conductive rod two 23 is separated from the auxiliary contact 241 on the conductive rod three 24, at this moment, the current feeding mechanism 2 is switched from the on state to the off state.
[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, which should be covered by the claims of the present application.
Claims
1. A current transformer suitable for outdoor installation, comprising a current transformer body (1), characterized in that, The current transformer body (1) is provided with terminal 1 (11) and terminal 2 (12). The current transformer body (1) is also provided with an extension slot (13). The extension slot (13) is equipped with a current supply mechanism (2) and a triggering mechanism (3). The current supply mechanism (2) is provided with an on state and an off state. The on state of the current supply mechanism (2) is used to connect terminal 1 (11) and terminal 2 (12). The off state of the current supply mechanism (2) is used to cut off the path between terminal 1 (11) and terminal 2 (12). The triggering mechanism (3) is used to switch the current supply mechanism (2) from the on state to the off state when the current increases abnormally.
2. A current transformer suitable for outdoor installation according to claim 1, characterized in that, The flow delivery mechanism (2) includes a first conductive rod (21), a rotating shaft (22), a second conductive rod (23), and a third conductive rod (24). The first conductive rod (21) and the third conductive rod (24) are fixedly installed in the extension groove (13). The rotating shaft (22) is rotatably installed in the extension groove (13). A coil spring (221) is sleeved on the surface of the rotating shaft (22).
3. A current transformer suitable for outdoor installation according to claim 2, characterized in that, A spiral section (211) is provided on the first conductive rod (21). One end of the first conductive rod (21) is connected to the first terminal (11), and the other end of the first conductive rod (21) is rotatably mounted on the surface of the rotating shaft (22).
4. A current transformer suitable for outdoor installation according to claim 3, characterized in that, One end of the conductive rod (23) is fixedly installed on the surface of the rotating shaft (22), and the other end of the conductive rod (23) is provided with a main contact (231). One end of the conductive rod (24) is provided with a secondary contact (241). The secondary contact (241) matches the main contact (231), and the other end of the conductive rod (24) is connected to the terminal block (12).
5. A current transformer suitable for outdoor installation according to claim 4, characterized in that, The triggering mechanism (3) includes a bending frame (31), a fixing frame (33), a receiving frame (35), a moving rod (36) and a guide rod (37). A magnet (32) is fixedly connected to one end of the bending frame (31), and a first connecting frame (311) is fixedly connected to the other end of the bending frame (31).
6. A current transformer suitable for outdoor installation according to claim 5, characterized in that, The fixing frame (33) is fixedly installed in the extension groove (13). A guide strip (331) is fixedly connected to the fixing frame (33), and a guide block (312) is fixedly connected to the bending frame (31). The guide block (312) is sleeved on the surface of the guide strip (331).
7. A current transformer suitable for outdoor installation according to claim 6, characterized in that, A second connecting frame (351) is fixedly connected to the receiving frame (35). A connecting rod (34) is provided between the second connecting frame (351) and the first connecting frame (311). One end of the connecting rod (34) is hinged to the first connecting frame (311), and the other end of the connecting rod (34) is hinged to the second connecting frame (351).
8. A current transformer suitable for outdoor installation according to claim 7, characterized in that, The moving rod (36) is fixedly connected to the receiving frame (35). One end of the moving rod (36) is fixedly connected to a U-shaped claw (361), and the other end of the moving rod (36) is fixedly connected to a guide block (362).
9. A current transformer suitable for outdoor installation according to claim 8, characterized in that, The guide rod (37) is fixedly installed in the extension groove (13), the guide block (362) is sleeved on the surface of the guide rod (37), and a compression spring (371) is sleeved on the surface of the guide rod (37).
10. A current transformer suitable for outdoor installation according to claim 9, characterized in that, A cover plate (14) is provided at the opening of the extension slot (13), and the cover plate (14) is fixedly connected to the current transformer body (1) by bolts.