Electrified disconnection arc extinguishing tool for small-current inductance equipment

Abstract

The invention relates to the technical field of power equipment, in particular to a low-current inductance equipment electrified disconnection arc extinction tool which comprises a shell, an arc extinction structure, a first connection mechanism, a second connection mechanism and an isolation switch. The first connecting mechanism and the second connecting mechanism are located at the two ends of the shell and extend into the shell. One end of the arc extinguishing structure is connected into the shell, and the other end of the arc extinguishing structure is connected with the second connecting mechanism; the shell is provided with an opening, the connecting end of the disconnecting switch is connected with the shell through the disconnecting switch fixing piece, and the operating end of the disconnecting switch extends out of the shell, rotates around the disconnecting switch fixing piece through the connecting end and extends into or is far away from the opening; when the operation end of the isolation switch rotatably extends into the opening, the connection end of the isolation switch applies pressure to the arc extinguishing structure, so that the arc extinguishing structure is electrically conducted, and closing is realized. When the disconnecting switch rotates to be away from the opening, switching-off is achieved, the disconnecting arc-extinguishing tool is simple in structure, a plurality of disconnecting arc-extinguishing tools can be connected in series, and three-phase synchronous switching-off is achieved by synchronously controlling the disconnecting switch.

Description

Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a live arc-extinguishing tool for low-current inductive equipment. Background Technology

[0002] Currently, during live-line work on 10kV distribution networks, especially when disconnecting or connecting lead wires of low-current inductive equipment, existing arc suppression devices still have several key issues regarding safety, applicability, and integration. These issues are as follows: Existing arc suppression switches mostly adopt a split structure design, relying on air as the arc-extinguishing medium. Their arc-extinguishing capability is limited, making it difficult to effectively suppress electric arcs when interrupting inductive currents. Electric arcs have long durations and high energy, which not only affect operational safety but may also cause equipment damage or even system failures.

[0003] When working on power distribution lines connected to voltage transformers (PTs) or other protective devices, existing tools typically require disconnecting the lead wires phase by phase, causing the PTs to operate in a phase-deficient state for extended periods. This condition can easily lead to power frequency overvoltage or resonant overvoltage, and in severe cases, may cause PT excitation characteristic saturation, winding overheating, and consequently, equipment insulation damage or even burnout.

[0004] Some cable terminal lines use a unique terminal block structure with specialized interface types. Existing arc suppression devices, due to structural or connection limitations, struggle to reliably connect and construct an effective arc suppression circuit. This results in a lack of suitable arc suppression methods for such work scenarios, restricting the applicability of live-line work and increasing operational risks.

[0005] Currently, there is no integrated, multi-functional arc suppression device that can simultaneously address all of the aforementioned problems. Existing technologies are limited in function and cannot meet the operational needs of different wiring configurations and equipment types, resulting in complex and time-consuming on-site operation procedures, which hinders further improvements in the efficiency and safety of live-line work.

[0006] Existing technologies, limited by arc-extinguishing capabilities and structural design, have become a core bottleneck in improving the safety and efficiency of live-line work. This not only directly leads to the risk of overvoltage during operation and equipment burnout, but also severely restricts the expansion of the work scope due to their inability to adapt to diverse field wiring. Summary of the Invention

[0007] In view of this, this application provides a live-line disconnection and arc-suppression tool for low-current inductive equipment to solve the technical problem of being unable to adapt to diverse field wiring. To achieve one or more of the above objectives or other objectives, this application proposes a live-line disconnection and arc-suppression tool for low-current inductive equipment, characterized by comprising a housing, an arc-suppression structure, a first connecting mechanism, a second connecting mechanism, and a disconnecting switch; The first connecting mechanism and the second connecting mechanism are located at both ends of the housing and extend into the housing; The arc-extinguishing structure is located inside the housing, with one end connected to the housing and the other end connected to the second connecting mechanism; The housing has an opening, the connection end of the disconnect switch is connected to the housing through a disconnect switch fixing member, and the operating end of the disconnect switch extends out of the housing and rotates around the disconnect switch fixing member through the connection end to extend into or away from the opening. When the operating end of the disconnecting switch is rotated and extended into the opening, it is electrically connected to the first connecting mechanism. The connecting end of the disconnecting switch applies pressure to the arc-extinguishing structure, causing the arc-extinguishing structure to conduct electricity and realize the closing of the circuit breaker. When the disconnecting switch rotates away from the opening, it is electrically disconnected from the first connecting mechanism, the pressure applied to the arc-extinguishing structure decreases and disappears, causing the arc-extinguishing structure to be electrically disconnected, thus achieving circuit breaking.

[0008] Preferably, the arc-extinguishing structure includes a vacuum cavity and a first electrical connector and a second electrical connector that are respectively connected to both ends of the vacuum cavity and extend into the vacuum cavity. The first electrical connector has an elastic structure connected to one end outside the vacuum cavity, and the second electrical connector has a second connecting mechanism connected to one end outside the vacuum cavity.

[0009] Preferably, the operating end of the disconnect switch is provided with a mounting hole.

[0010] Preferably, the housing is rotatably fitted with a locking member, which can expose or hide the opening by rotating.

[0011] Preferably, the end of the first connecting mechanism away from the housing is provided with a wiring structure.

[0012] Preferably, an installation auxiliary structure is provided at the end of the first connecting mechanism away from the housing.

[0013] Preferably, the housing includes a first housing, a second housing, and a housing connector, the arc suppression structure is located inside the first housing, the disconnect switch is connected to the housing connector, and the opening is located on the second housing.

[0014] Preferably, the end of the second connecting mechanism away from the housing is provided with a cable routing hole.

[0015] Preferably, the disconnector fixing component includes a hollow shaft, which is connected to the disconnector. The hollow shaft is located outside the housing; Alternatively, the hollow shaft is located inside the housing, and the housing includes at least one hole that is coaxial with the hole in the hollow shaft.

[0016] Preferably, the housing is provided with a first cover and a second cover at both ends, a first connecting mechanism is connected to the inner wall of the housing and passes through the first cover, and a second connecting mechanism passes through the second cover and is connected to the second connecting mechanism.

[0017] Implementing the embodiments of this application will have the following beneficial effects: The live-line arc-extinguishing tool for low-current inductors described in this application is connected to the line via a first connecting mechanism and a second connecting mechanism. The line is disconnected / connected by a disconnecting switch. The tool includes a vacuum arc-extinguishing structure, which constructs an effective arc-extinguishing circuit through the disconnecting switch and completely extinguishes the arc. Furthermore, the tool has a simple structure and can be connected in series, achieving three-phase synchronous disconnection through synchronous control of the disconnecting switch. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] in: Figure 1 This is a cross-sectional schematic diagram of a live arc-extinguishing tool for a small-current inductive device in one embodiment; Figure 2 This is a schematic diagram of a casing explosion in one embodiment; Figure 3 This is a three-dimensional schematic diagram of a portion of the structure in one embodiment; Figure 4 This is a schematic diagram of two small-current inductive devices connected adjacent to each other by a live arc-extinguishing tool in one embodiment; Figure 5 This is a schematic diagram of two small-current inductive devices connected adjacent to each other by a live arc-extinguishing tool in one embodiment; Figure 6 This is a schematic diagram of the adjacent connection of three small-current inductive devices with a live disconnection arc suppression tool in one embodiment; Figure 7 This is a schematic diagram of the internal structure of the arc-extinguishing mechanism during circuit breaker tripping in one embodiment.

[0020] Explanation of reference numerals in the attached figures: 10 Housing, 11 Opening, 12 Locking element, 13 First cover, 14 Second cover, 15 Housing fixing element, 101 First housing, 102 Second housing, 103 Housing connector, 104 Slide groove, 111 Rubber strip, 121 Handle, 122 Stop bolt, 20 Arc suppression structure, 21 Vacuum cavity, 22 First electrical connector, 23 Second electrical connector, 24 Elastic structure, 30 First connecting mechanism, 31 Wiring structure, 32 Installation auxiliary structure, 33 Opening and closing slot, 331 First slot, 332 Second slot, 40 Second connecting mechanism, 41 Cable routing hole, 50 Disconnecting switch, 51 Mounting hole, 52 Disconnecting switch fixing element, 53 Hollow shaft, 54 Electrical contact, 60 Insulating connecting rod, 61 First fixing rod, 62 Second fixing rod. Detailed Implementation

[0021] The technical solutions of the embodiments 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, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] like Figure 1 As shown, this embodiment discloses a live disconnection and arc suppression tool for a small current inductor device, including a housing 10, an arc suppression structure 20, a first connecting mechanism 30, a second connecting mechanism 40, and a disconnecting switch 50; The first connecting mechanism 30 and the second connecting mechanism 40 are connected to both ends of the housing 10; The arc-extinguishing structure 20 is located inside the housing 10, with one end connected to the housing 10 and the other end connected to the second connecting mechanism 40; Understandably, the first connecting mechanism 30 and the second connecting mechanism 40 are made of conductive material and are used to connect the two ends of the drain wire to be disconnected. The housing 10 is made of insulating material, typically a high-strength insulating material, such as epoxy resin, glass fiber reinforced plastic, or special engineering plastic, to protect the internal arc-suppressing structure 20.

[0023] The housing 10 has an opening 11 that extends through the inside and outside. The connecting end of the disconnecting switch 50 is connected to the housing 10 via a disconnecting switch fixing member 52. The operating end of the disconnecting switch 50 is a movable end that can extend outside the housing 10. The operating end rotates around the disconnecting switch fixing member 52 via the connecting end and partially extends into or away from the opening 11. The specific structure of the opening 11 is as follows: Figure 2 As shown, the opening is preferably U-shaped or rectangular. The specific shape and size can be adjusted according to the shape and size of the operating end of the disconnect switch 50, so that the operating end of the disconnect switch 50 can be smoothly inserted into the housing 10.

[0024] When the operating end of the disconnect switch 50 is rotated and extended into the opening 11, it is electrically connected to the first connecting mechanism 30. The connecting end of the disconnect switch 50 applies pressure to the arc-extinguishing structure 20, causing the arc-extinguishing structure 20 to be electrically connected, thereby achieving closing. When the operating end of the disconnecting switch 50 is rotated away from the opening 11, it is electrically disconnected from the first connecting mechanism 30, the pressure applied to the arc-extinguishing structure 20 decreases and disappears, causing the arc-extinguishing structure 20 to be electrically disconnected, thus achieving circuit breaking.

[0025] It is understood that the disconnector switch 50 includes a connecting end and an operating end. The connecting end of the disconnector switch 50 is connected to the housing 10 via a disconnector switch fixing member 52, specifically through a rotating shaft. The connecting end of the disconnector switch 50 is fixed inside the housing 10, while the operating end of the disconnector switch 50 can rotate around the fixing member 52. When the operating end of the disconnector switch 50 rotates and extends into the opening 11, it makes electrical contact with the first connecting mechanism 30 fixed inside the housing. Simultaneously, during rotation, the connecting end of the disconnector switch 50 applies a positive pressure to the arc-suppressing structure 20 inside the housing 10, driving the arc-suppressing structure 20 to conduct, thereby achieving the "closed" state of the entire device and establishing a complete conductive path from the first connecting mechanism 30 through the disconnector switch 50, the arc-suppressing structure 20, to the second connecting mechanism 40. Conversely, when the operating end of the disconnector switch 50 rotates away from the opening 11, its electrical connection with the first connecting mechanism 30 is first broken. Subsequently, the pressure applied to the arc-extinguishing structure 20 decreases and disappears, and the arc-extinguishing structure 20 returns to the open state under the action of its internal elastic element, thus achieving "shutdown".

[0026] Preferably, the disconnector 50 is made of a highly conductive metal material (such as pure copper or brass) and has an external fully insulating sealing layer. When the switch is closed, the metal material at the connection point between the operating terminal and the first connecting mechanism 30 is exposed, and the metal material is connected to the first connecting mechanism 30. The exposed metal material at the connection point between the disconnector 50 and the arc-suppression structure 20 enables electrical connection.

[0027] Please refer to Figure 3 The fixing member 52 is a groove, and the connecting end of the disconnecting switch 50 is sleeved in the groove of the fixing member 52 and is rotatably connected by a bushing, so that the operating end of the disconnecting switch 50 can rotate around the connecting end.

[0028] This embodiment constructs a basic architecture for a single, integrated, low-current inductive device with live disconnection and arc suppression tool. The rotation of the isolating switch 50 simultaneously controls two electrical actions: first, to establish and disconnect the electrical connection with the first connecting mechanism 30; and second, to mechanically pressurize and release the arc suppression structure 20, thereby synchronously driving its internal conduction and disconnection. This design integrates mechanical operation, current transfer, and vacuum arc suppression into a compact housing 10, realizing a transformation from a "split-type tool assembly" to an "integrated single device," providing a foundation for high efficiency, safety, and reliability.

[0029] In some embodiments, rubber strips 111 are provided on the two long sides of the opening 11 to prevent the disconnecting switch 50 from colliding with the housing 10. Simultaneously, a gap is left between the rubber strips 111 for the disconnecting switch 50 to pass through. When the disconnecting switch 50 partially extends into the housing 10, it buffers the collision between the disconnecting switch 50 and the housing 10 during operation, and also provides a pre-tightening and limiting effect on the disconnecting switch 50, allowing the operating end of the disconnecting switch 50 to directly connect to the first connecting mechanism 30 without deviation when extended.

[0030] When the control terminal rotates toward the opening 11 of the housing 10, the terminal gradually approaches the opening 11 and partially extends into the housing 10, bringing it into contact with the first connecting mechanism 30 extending into the housing 10, thus achieving an electrical connection. Simultaneously, the connecting end of the disconnecting switch 50 applies pressure to the arc-extinguishing structure 20 during rotation, causing an internal electrical connection within the arc-extinguishing structure 20, i.e., making the arc-extinguishing structure 20 conductive. This, in turn, energizes the entire low-current inductive device, disconnecting the arc-extinguishing tool and enabling closing the circuit.

[0031] The arc extinguishing structure 20 adopts a vacuum arc extinguishing method, which has stronger dielectric recovery strength and arc extinguishing capability compared with traditional air arc extinguishing. It can reliably interrupt inductive small currents, effectively suppress arc leakage and reignition, and ensure the safety of operators and equipment.

[0032] In some embodiments, the arc-extinguishing structure 20 includes a vacuum chamber 21 and a first electrical connector 22 and a second electrical connector 23 that are connected to both ends of the vacuum chamber 21 and extend into the vacuum chamber 21. The first electrical connector 22 is connected to an elastic structure 24 at one end outside the vacuum chamber 21, and the second electrical connector 23 is connected to the second connecting mechanism 40 at one end outside the vacuum chamber 21.

[0033] Please refer to Figure 1 It is understood that the arc-suppression structure 20 includes a sealed vacuum chamber 21, preferably made of insulating ceramic or glass material, with a high vacuum environment inside (vacuum level typically below 10). -4Pa). The first electrical connector 22 and the second electrical connector 23 are made of conductive material. The vacuum chamber 21 is typically evacuated to an extremely high vacuum (typically below 10 Pa). -4 The vacuum arc (Pa) has extremely low concentrations of gas molecules. This results in a very long mean free path for charged particles (electrons and ions), making collisional ionization difficult and preventing the formation of a continuous discharge channel. In lines with voltage transformers (PTs), unstable arc combustion or forced interruption of the current at a non-zero point can lead to severe operational overvoltages. Vacuum arcs, maintained by metal vapor, exhibit diffuse and stable morphology, unlike air arcs which are subject to violent stretching and cooling. Their smooth extinguishing at the natural zero-crossing of the current significantly reduces the risk of current interruption, effectively suppressing operational overvoltages and protecting power grid equipment.

[0034] In some embodiments, the first electrical connector 22 includes a first conductive rod 221 and a moving contact 222 connected to the first conductive rod 221 within the vacuum cavity 21. The second electrical connector 23 includes a second conductive rod 231 and a stationary contact 232 connected to the second conductive rod 231 within the vacuum cavity 21. The moving contact 222 is integrally formed with the first conductive rod 221 from the same material, or it is a connector connected to the first conductive rod 221. The stationary contact 232 is integrally formed with the second conductive rod 231 from the same material, or it is a connector connected to the second conductive rod 231. The moving contact 222 and the stationary contact 232 are made of a metal material with excellent conductivity, such as silver or gold.

[0035] When the disconnecting switch 50 begins to close, the connecting end of the disconnecting switch 50 applies pressure to the first electrical connector 22, causing the first electrical connector 22 to move towards the second electrical connector 23. When the closing is completed, the first electrical connector 22 and the second electrical connector 23 are connected, thereby achieving electrical conduction. At this time, the first connecting mechanism 30, the arc-extinguishing structure 20, and the second connecting mechanism 40 form a controllable conductive path. Figure 1 When the circuit is closed, the first electrical connector 22 and the second electrical connector 23 are in contact, thus achieving electrical connection.

[0036] When the circuit is closed, the disconnector 50 simultaneously applies pressure to the elastic structure 24, causing the elastic structure 24 to undergo elastic deformation. When the circuit is opened, as the pressure disappears, the elastic deformation restoring force of the elastic structure 24 drives the first electrical connector 22 to move away from the second electrical connector 23, thereby disconnecting the first electrical connector 22 from the second electrical connector 23. The elastic structure 24 can be a spring or a metal sheet, etc., with one end connected to the inner wall of the housing 10 or the connection end of the disconnector 50, and the other end connected to the first electrical connector 22.

[0037] In some embodiments, an angle sensor (not shown) is provided at the connection between the disconnecting switch 50 and the disconnecting switch fixing member 52. The angle sensor can sense the angle change when it is rotated in reverse to determine whether it is in the state of disconnection / closing. The sensor wirelessly transmits the disconnection / closing status information to the power grid control system for remote monitoring.

[0038] In some embodiments, the connection end of the disconnecting switch 50 is provided with an electrical contact 54 along the connection point with the housing 10 toward the first electrical connector 22. The electrical contact is in the shape of a straight line, a figure-7, or an arc. The electrical contact 54 is an integral structure with the disconnecting switch 50, or is additionally provided, and is used to apply or release pressure to the first electrical connector 22 when the disconnecting switch 50 is rotated, so that the internal electrical conduction of the arc extinguishing structure 20 is turned on or off.

[0039] In some implementations, the operating end of the disconnector switch 50 is provided with a mounting hole 51.

[0040] Referring to Figure 4, it can be understood that the number of mounting holes 51 is unlimited. These holes are used to pass through the insulating connecting rods 60, simultaneously connecting at least one disconnecting switch 50 adjacent to another. By operating one of the insulating connecting rods 60, all adjacent disconnecting switches 50 can be moved synchronously. That is, the corresponding adjacent small-current inductive equipment can be operated to disconnect / close the arc-suppression tool. In some embodiments, the disconnecting switch 50 is a conductive structure and cannot be directly operated to disconnect / close; it needs to be operated through the insulating operating rod 60. In other embodiments, the upper part of the operating end of the disconnecting switch 50 is provided with an insulating structure (not shown in the figure), allowing direct operation of the disconnecting switch 50 to disconnect / close.

[0041] By connecting an insulating rod 60 to the mounting hole 51, multiple disconnecting switches 50 can be operated simultaneously by manipulating one insulating rod 60, ensuring that multi-phase lines (such as three phases A, B, and C) can be connected or disconnected at the same time. This fundamentally avoids the problem of phase-loss operation of PTs (voltage transformers) caused by traditional phase-by-phase operation, effectively preventing overvoltage caused by phase loss and protecting the safety of power grid equipment. This greatly simplifies the operation steps, shortens the live-line working time, and thus directly improves work efficiency. The disconnecting switch 50 must be operated through the insulating rod 60, or an insulating structure must be installed at the operating end of the disconnecting switch 50, which provides a reliable insulation barrier between the operator and high-voltage electricity, fundamentally ensuring the personal safety of the operator.

[0042] In some embodiments, the housing 10 is rotatably fitted with a locking member 12, which, by rotation, exposes or conceals the opening 11.

[0043] like Figure 2As shown, the locking element 12 is an arc-shaped baffle that matches the shape of the housing 10. It can rotate around the housing 10. After closing, the disconnector 50 extends into the housing 10, with only part of the operating end of the disconnector 50 outside the housing 10. The locking element 12 can be rotated to cover the opening 11, preventing the disconnector 50 from accidentally falling off or being misoperated, thus preventing accidental tripping. Similarly, after tripping, the locking element 12 can be rotated to cover the opening 11, preventing accidental operation of the disconnector 50 to close the circuit. The locking element 12 can be slidably fixed to the housing 10, for example, by passing a stop bolt 122 through the groove 104 of the housing 10, allowing the locking element 12 to rotate along the housing 10 without falling off. The design of the locking element 12 significantly improves the inherent safety and operational reliability of the equipment.

[0044] In some embodiments, a handle 121 is connected to the locking member 12. The handle 121 can be any structure, such as ring, sphere, or rectangle, that is convenient to pinch with fingers and apply force to the locking member 12.

[0045] In some embodiments, the handle 121 and the stop bolt 122 are of the same structure, that is, one end of the handle 121 is a bolt that can pass through the slide groove 104 to connect the locking member 12 and the housing 10.

[0046] The connection position of the handle 121 to the locking member 12 is not limited. It can be connected by welding, nuts, or detachable snap-fit ​​connections, or it can be integrally formed with the locking member 12. In this embodiment, the handle 121 is in the shape of a ring and is located in the center of the locking member 12. The handle can be operated manually. In some unexpected situations, such as when there is a risk of leakage, an insulating hook can be used to hook the ring, so that the opening 11 is covered or exposed.

[0047] By providing a locking element 12 that can rotate around the housing 10, a simple and effective mechanical locking mechanism is provided for the device. After closing or opening the circuit, rotating the locking element 12 blocks the opening 11, which can physically prevent the isolating switch 50 from changing its state due to accidental collision, vibration or misoperation, significantly improving the inherent safety and operational stability of the device and avoiding major accidents caused by accidental opening or closing.

[0048] In some embodiments, a wiring structure 31 is provided at the end of the first connecting mechanism 30 away from the housing 10. Please refer to... Figure 1As shown, the wiring structure 31 is a conductive structure used to connect to the power grid line. The wiring structure 31 is a detachable connecting wire and can be a C-clamp, pluggable connector, bolt-fixed clamp, clip, or other structure that can fix the wire in place. In this embodiment, a bolt-fixed clamp is used. The wire is locked or released by rotating the bolt. The operating end of the bolt in the bolt-fixed clamp is a ring, which can be rotated by inserting an insulating rod or similar object into the ring to lock or release the wire, avoiding safety issues caused by direct human contact. This method of connecting to the line is convenient and safe. Furthermore, the large contact area between the clamp and the wire results in low contact resistance, meeting the needs of high-current circuits. The design of the wiring structure 31 also makes the application scenarios of low-current inductive equipment arc-extinguishing tools more flexible.

[0049] The wiring structure 31, located at the end of the first connecting mechanism 30, provides an interface for quick and reliable connection to external conductors. It can be designed as a C-clamp, bolt, or other fixing method, enabling convenient connection to the power grid and high current-carrying capacity. The cable routing hole 41, located at the end of the second connecting mechanism 40, provides another method of conductor connection, facilitating wire fixing and guidance, making external wiring more organized, and adapting to different field wiring requirements. Together, they enhance the adaptability and flexibility of the device's external wiring.

[0050] In some embodiments, an installation auxiliary structure 32 is provided at one end of the first connecting mechanism 30 away from the housing 10.

[0051] like Figure 1 As shown, the installation auxiliary structure 32 is a ring, a C-shaped arc, or a structure with screw holes, used to install the low-current inductive equipment live disconnection and arc extinguishing tool in a preset position. The installation auxiliary structure 32 provides a flexible and stable preset installation interface, enabling the low-current inductive equipment live disconnection and arc extinguishing tool to be temporarily and reliably fixed in a specific position at the work site, thereby achieving pre-positioning of the tool, freeing the operator's hands, and ensuring the accuracy and stability of subsequent operations.

[0052] In this embodiment, the installation auxiliary structure 32 is a circular ring, which can be directly installed through the insulating connecting rod, or remotely installed to a certain height by inserting a hanging rope through a gun. The installation auxiliary structure 32 includes a circular ring and a bolt integrally formed with the circular ring, and is connected to the first connecting mechanism 30 through the bolt.

[0053] By setting an installation auxiliary structure 32 (such as a ring or C-groove) on the first connecting mechanism 30, a preset installation and fixing point is provided for the entire device. This allows operators to safely and accurately suspend or fix the device to the work point such as the pole or tower from the ground or a safe location using tools such as insulated rods and traction ropes, achieving pre-positioning, thus freeing their hands, laying a stable foundation for subsequent precision operations, and reducing the risks of working at height.

[0054] In some embodiments, the housing 10 includes a first housing 101, a second housing 102, and a housing connector 103. The first housing 101 is connected to the second housing 102 via the housing connector 103. The arc suppression structure 20 is located inside the second housing 102. The disconnecting switch 50 is connected to the housing connector 103. The opening 11 is located on the first housing 101.

[0055] like Figure 2 As shown, it can be understood that the housing 10 is an insulating structure, forming electrical insulation between the internal conductive structure and the external structure to ensure safety. At the same time, the housing 10 adopts a split modular design to physically separate and functionally integrate the core arc suppression structure 20 and the disconnecting switch 50, thereby optimizing the production and assembly process, facilitating professional maintenance, and achieving targeted protection for key components.

[0056] In some embodiments, the end of the second connecting mechanism 40 furthest from the housing 10 is provided with a cable routing hole 41. Please refer to... Figure 4 It is understandable that there can be one or more cable holes 41. Cable holes 41 are used to connect wires and form a conductive path with the lines connected to the wiring structure 31.

[0057] In some embodiments, the disconnector fixing member 52 includes a hollow shaft 53 connected to the disconnector 50; the hollow shaft 53 is located outside the housing 10; or, the hollow shaft 53 is located inside the housing 10, and the housing 10 includes at least one hole coaxial with the hole of the hollow shaft 53.

[0058] like Figure 3As shown, it can be understood that the disconnecting switch 50 is connected to the housing 10 via a hollow shaft 53. The hollow shaft 53 is used to connect the first fixing rod 61. The two ends of the first fixing rod 61 are respectively connected to the hollow shafts 53 of two small current inductor live disconnecting and arc-extinguishing tools, so that the two small current inductor live disconnecting and arc-extinguishing tools can be connected adjacently. Multiple small current inductor live disconnecting and arc-extinguishing tools can be connected adjacently through multiple first fixing rods 61. Through the plug-in cooperation of the first fixing rod 61 and the hollow shaft 53, a rigid transmission system that can be flexibly assembled is constructed, which can mechanically connect multiple independent small current inductor live disconnecting and arc-extinguishing tools into one unit. This rigid connection ensures that when one disconnecting switch 50 is operated, the torque is transmitted to all other adjacent disconnecting switches through the insulating rod with almost no delay, in order to prevent the small current inductor live disconnecting and arc-extinguishing tools from moving and affecting the success of synchronous operation. This is crucial for power grid operations that require simultaneous operation of the three phases, effectively preventing eddy currents, circulating currents, and operational overvoltages caused by asynchronous opening and closing of circuit breakers.

[0059] The disconnector switch fixing member 52 can be completely located inside the housing 10 or partially extend outside the housing 10. When the disconnector switch fixing member 52 is completely located inside the housing 10, the hollow shaft 53 is also located inside the housing 10. At least one hole must be provided on the housing 10 and the hole of the hollow shaft 53 must be on the same axis so that the first fixing rod 61 can pass through the housing 10 and connect to the hollow shaft 53.

[0060] When the disconnector fixing part 52 extends out of the housing 10, the hollow shaft 53 is located outside the housing 10, and the first fixing rod 61 is directly connected to the hollow shaft 53.

[0061] In this embodiment, the fixing member 52 is disposed inside the housing 10. The first fixing rod 61 can pass through the housing 10 and connect to the hollow shaft 53, making the connection between the two low-current inductive devices and the arc-extinguishing tool more stable.

[0062] In some embodiments, a first cover 13 and a second cover 14 are respectively provided at both ends of the housing 10. A first connecting mechanism 30 is connected to the inner wall of the housing 10 and passes through the first cover 13. A second connecting mechanism 40 passes through the second cover 14 and is connected to the second connecting mechanism 40.

[0063] like Figures 1-4 As shown, the first cover 13 and the second cover 14 are detachably connected to the housing 10. By removing specific covers, the internal structure of the housing 10 can be inspected or maintained in a targeted manner without exposing the entire interior of the housing 10, making the operation more targeted. The first cover 13 and the second cover 14 are also insulating structures, and when they are closed at both ends of the housing 10, they can maintain the integrity of the entire low-current inductive device's live disconnection and arc suppression tool.

[0064] In some embodiments, at least one housing fastener 15 is provided on the outer surface of the housing 10 opposite to the disconnecting switch 50.

[0065] Please refer to the details. Figure 5 It is understandable that the housing fixing member 15 is used to connect the second fixing rod 62, and to connect and fix the live disconnection and arc suppression tools of two adjacent small current inductive devices, preventing twisting or displacement of a single unit under force. This ensures operational synchronization accuracy. The rigid connection ensures that when a disconnecting switch 50 is operated, the generated force can be transmitted synchronously and accurately to all units in the series group, preventing asynchronous operation caused by minor deformation or displacement of the live disconnection and arc suppression tools of adjacent small current inductive devices.

[0066] Preferably, the housing fastener 15 is disposed on the housing connector 103. Since the housing connector 103 is typically located in the structural center region of the housing 10, providing a fastener at this location helps optimize the force distribution of the device, thereby improving its overall structural stability. To further enhance the connection rigidity of multiple low-current inductive devices in an adjacent connection state, a housing fastener 15 can also be added to the end of the first housing 101 near the first cover 13. Figure 4 As shown, by using a first fixing rod 61 and two second fixing rods 62 to coordinately fix the live disconnection and arc suppression tools of two adjacent small current inductive devices, the relative displacement and shaking of the device group can be effectively suppressed when the circuit breaker or circuit breaker is opened or closed at the same time, ensuring the stability and reliability of the operation process.

[0067] In some embodiments, the first connecting mechanism 30 is provided with an opening and closing slot 33 at one end inside the housing 10, and the opening and closing slot 33 is a U-shaped opening.

[0068] like Figure 3As shown, the opening / closing slot 33 includes a first slot 331 and a second slot 332, made of two separate U-shaped metal parts. The disconnector 50 is a travel-type disconnector. When closed, the operating end of the disconnector 50 is pushed into the first slot 331, connecting with both sides of the closing slot 331, achieving electrical conduction between the disconnector 50 and the first connecting mechanism 30. However, the first electrical connector 22 and the second electrical connector 23 within the arc-extinguishing structure 20 are not in contact. Further pushing the operating end of the disconnector 50 into the second slot 332, simultaneously, the connecting end of the disconnector 50 pushes the first electrical connector 22 and the second electrical connector 23 within the arc-extinguishing structure 20 into contact, achieving electrical conduction. When open, the operating end of the disconnector 50 is disconnected from the second slot 332, and simultaneously, the elastic structure causes the first electrical connector 22 and the second electrical connector 23 within the arc-extinguishing structure 20 to disconnect, performing vacuum arc extinguishing. Pull out the isolating switch 50 further. The operating end of the isolating switch 50 is disconnected from the first slot 331, realizing complete isolation of the line. At this time, the arc is extinguished and there is no current load in the conductive circuit. The circuit is completely disconnected, which meets the safety requirements.

[0069] For a description of the opening and closing states of this application, please refer to [reference needed]. Figure 6 As shown, this is a live disconnection and arc suppression tool for three adjacent connected low-current inductive devices. The isolating switch 50 is far away from the opening 11 to achieve three-phase synchronous operation.

[0070] To describe the disconnection / connection state inside the arc suppression structure 20 of this application, such as Figure 7 As shown, the arc-extinguishing structure 20 is in the open state when the circuit is broken, with the first electrical connector 22 and the second electrical connector 23 separated.

[0071] This application employs a vacuum arc-extinguishing structure, completely replacing the traditional air arc-extinguishing method. Utilizing the high insulation and rapid dielectric recovery capability of the vacuum environment, it reliably extinguishes the arc when the current crosses zero, fundamentally suppressing arc reignition and arcing phenomena. Simultaneously, it effectively suppresses operational overvoltages, avoiding resonant overvoltages caused by current cutting off or phase loss operation of the PT, protecting PTs, cable terminals, and other equipment from insulation breakdown or burnout.

[0072] By using the mounting hole 51 on the disconnector 50, the hollow shaft 53, and the insulating connecting rod 60, multiple arc-extinguishing devices can be rigidly connected to achieve simultaneous disconnection of the three phases. Operating a single insulating rod can synchronously control all series disconnectors, completely avoiding the problem of prolonged phase loss of PTs caused by traditional phase-by-phase operation, significantly improving work efficiency, and fundamentally eliminating the system risks caused by asynchronous operation.

[0073] After closing / opening, the locking element 12 covers the opening 11, forming a mechanical lock, which effectively prevents the disconnecting switch from being accidentally opened or closed due to accidental impact or vibration.

[0074] The housing fastener 15 and the fixing rod 62 provide an external rigid connection when multiple devices are connected adjacently, enhancing the overall structural stability and ensuring accurate and reliable synchronous operation.

[0075] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A live arc-extinguishing tool for low-current inductive devices, characterized in that: Includes a housing, an arc-suppression structure, a first connecting mechanism, a second connecting mechanism, and a disconnecting switch; The first connecting mechanism and the second connecting mechanism are located at both ends of the housing and extend into the housing; The arc-extinguishing structure is located inside the housing, with one end connected to the housing and the other end connected to the second connecting mechanism; The housing has an opening, the connection end of the disconnect switch is connected to the housing through a disconnect switch fixing member, and the operating end of the disconnect switch extends out of the housing and rotates around the disconnect switch fixing member through the connection end to extend into or away from the opening. When the operating end of the disconnecting switch is rotated and extended into the opening, it is electrically connected to the first connecting mechanism. The connecting end of the disconnecting switch applies pressure to the arc-extinguishing structure, causing the arc-extinguishing structure to conduct electricity and realize the closing of the circuit breaker. When the disconnecting switch rotates away from the opening, it is electrically disconnected from the first connecting mechanism, the pressure applied to the arc-extinguishing structure decreases and disappears, causing the arc-extinguishing structure to be electrically disconnected, thus achieving circuit breaking.

2. The low-current inductive device live disconnection and arc suppression tool as described in claim 1, characterized in that: The arc-extinguishing structure includes a vacuum cavity and a first electrical connector and a second electrical connector that are respectively connected to both ends of the vacuum cavity and extend into the vacuum cavity. The first electrical connector has an elastic structure connected to one end outside the vacuum cavity, and the second electrical connector has a second connecting mechanism connected to one end outside the vacuum cavity.

3. The low-current inductive device live disconnection and arc suppression tool as described in claim 1, characterized in that: The operating end of the disconnect switch is provided with a mounting hole.

4. The low-current inductive device live disconnection and arc suppression tool as described in claim 1, characterized in that: The housing is rotatably fitted with a locking element, which can expose or hide the opening by rotating the locking element.

5. The low-current inductive device live disconnection and arc suppression tool as described in claim 1, characterized in that: The end of the first connecting mechanism away from the housing is provided with a wiring structure.

6. The low-current inductive device live disconnection and arc extinguishing tool as described in claim 1, characterized in that: An installation auxiliary structure is provided at the end of the first connecting mechanism away from the housing.

7. The low-current inductive device live disconnection and arc suppression tool as described in claim 1, characterized in that: The housing includes a first housing, a second housing, and a housing connector. The arc-suppressing structure is located inside the first housing, the disconnecting switch is connected to the housing connector, and the opening is located on the second housing.

8. The low-current inductive device live disconnection and arc extinguishing tool as described in claim 1, characterized in that: The second connecting mechanism has a cable routing hole at the end away from the housing.

9. The low-current inductive device live disconnection and arc extinguishing tool as described in claim 1, characterized in that: The disconnector switch fixing component includes a hollow shaft, which is connected to the disconnector switch; The hollow shaft is located outside the housing; Alternatively, the hollow shaft is located inside the housing, and the housing includes at least one hole that is coaxial with the hole in the hollow shaft.

10. The low-current inductive device live disconnection and arc suppression tool as described in claim 1, characterized in that: The housing is provided with a first cover and a second cover at both ends. A first connecting mechanism is connected to the inner wall of the housing and passes through the first cover. A second connecting mechanism passes through the second cover and is connected to the second connecting mechanism.

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