Light electric arc extinction switch for disconnecting mutual inductor lead

Abstract

The utility model discloses a light electric arc extinction switch for disconnecting a mutual inductor lead, and relates to the technical field of automation equipment of an electric power system. Comprising an external insulating cover and an internal arc extinguishing device. The top of the external insulating cover is provided with a first incoming line wiring assembly which is matched with the access of a high-voltage line. The incoming line wiring assembly comprises a vacuum switch chamber and a wire clamp. The internal arc-extinguishing device comprises an arc-extinguishing insulating rod, a voltage release assembly and an insulating rod movement distance regulation and control assembly which are installed at the lower section of the arc-extinguishing insulating rod body, a second incoming line wiring assembly which is installed at the upper section of the arc-extinguishing insulating rod body and cooperates with equipment incoming line access, and a switch insulating block which is installed at the top of the arc-extinguishing insulating rod and cooperates with the vacuum switch chamber. And the control module is used for controlling the access and cut-off of incoming current. The light electric arc extinction switch for disconnecting the mutual inductor lead remotely controls connection and disconnection of incoming line current, and works by taking vacuum as an arc extinction medium based on a zero arc extinction principle, so that generation and extinction of contact arcs are carried out in the vacuum.

Description

Technical Field

[0001] This utility model relates to the field of power system automation equipment technology, and in particular to a lightweight electric arc suppression switch for disconnecting the leads of a current transformer. Background Technology

[0002] In power distribution network automation, traditional methods for disconnecting voltage transformer (PT) leads generally require a short power outage to facilitate operations such as PT fuse replacement and line maintenance. However, current mainstream techniques typically rely on the coordination of bypass cables and load switches to disconnect PT leads. This method has several significant problems, as follows:

[0003] 1. The equipment is heavy and inconvenient to move.

[0004] Bypass cable systems are generally bulky, making them difficult to handle and install on-site. In certain constrained working environments, operators face physical challenges in moving and installing equipment, which in turn affects overall work efficiency and increases worker workload and safety risks.

[0005] 2. Narrow spacing between transformer leads

[0006] The layout of PT leads is usually quite compact, resulting in limited space and making it very difficult to fix the bypass cable. Due to the small spacing between the leads, the stability of the bypass system is severely affected, which can easily lead to equipment loosening during operation, thereby causing safety hazards and operational errors.

[0007] 3. The bypass cable is too long and heavy.

[0008] In general, bypass cables are typically over 15 meters long and relatively heavy, which can be insufficient to support the transformer leads. Long and heavy cables not only increase the complexity of the work but also affect the controllability and reliability of the operation, potentially leading to equipment damage or operational errors.

[0009] 4. Manual operation is time-consuming and labor-intensive.

[0010] Most bypass load switches require manual operation, which increases the time and complexity of the work. Furthermore, manual operation is prone to human error, and the safety and reliability of manual operation in high-load, high-voltage environments are concerns.

[0011] 5. Risk of electric arc

[0012] During traditional disconnection processes, especially at the moment of load switching and disconnection, electric arcing may occur. The high temperature generated by the arc poses a significant threat to the contacts and insulation materials, potentially causing contact damage and insulation breakdown. Furthermore, the arc increases the risk of short-circuit faults, and in severe cases, may cause contact burnout, or even fire or explosion, greatly endangering equipment safety and personnel lives.

[0013] The problems mentioned above significantly limit the promotion of power system distribution network automation circuit breakers, leading to a decrease in power supply reliability and an increase in maintenance costs. Utility Model Content

[0014] To address the aforementioned problems, this utility model provides a lightweight electric arc extinguishing switch for disconnecting current transformer leads. This lightweight electric arc extinguishing switch is based on the zero-point arc extinguishing principle and operates using a vacuum as the arc extinguishing medium, allowing the generation and extinguishing of the contact arc to occur in a vacuum. The arc extinguishing process does not require close-range manual operation, greatly improving safety.

[0015] The technical solution adopted in this utility model is as follows:

[0016] A lightweight electric arc-suppression switch for disconnecting current transformer leads includes an external insulating cover and an internal arc-suppression device. The top of the external insulating cover is equipped with a first incoming line connection assembly for high-voltage line access, which includes a vacuum switch chamber and clamps. The internal arc-suppression device is installed inside the external insulating cover and can move vertically within the cover during a momentary high-voltage surge upon closing. It includes an arc-suppression insulating rod, a voltage release assembly and an insulating rod movement distance control assembly installed on the lower section of the rod, a second incoming line connection assembly installed on the upper section of the rod for equipment incoming line access, a switch insulating block installed on the top of the rod for cooperation with the vacuum switch chamber, and a control module for controlling the access and disconnection of the incoming current.

[0017] Furthermore, the first incoming line wiring assembly includes a vacuum switch chamber, which is fixedly installed on the top of the outer insulating cover and extends through the outer insulating cover into it. A wire clamp is installed on the top of the vacuum switch chamber, which is detachably installed on the high-voltage line via the wire clamp.

[0018] Furthermore, the wire clamp includes a wire clamp body, which has a wire inlet groove, and a wire inlet clamping block is threadedly installed at the wire inlet groove. One end of the wire inlet clamping block is provided with a lifting ring.

[0019] Furthermore, the external insulating cover includes a hollow rectangular insulating frame, and a cylindrical external insulating cover is detachably installed on the outside of the rectangular insulating frame; the bottom of the rectangular insulating frame is connected to the coil base, and the coil base and the rectangular insulating frame cooperate to form a space for the internal arc suppression device to be installed.

[0020] Furthermore, the coil base is connected to the fixing frame by four fixing rods. The fixing frame is located inside the rectangular insulating frame, and the rectangular insulating frame and the coil base cooperate to form the installation space for the voltage release component.

[0021] Furthermore, the insulating rod movement distance control assembly includes an upper limit adjusting nut, a lower limit adjusting nut, and an insulating base; the insulating base is located below the coil base and is slidably connected to the coil base via two plugs; the arc-extinguishing insulating rod passes sequentially through the fixed frame, the coil base, and the insulating base, with the upper limit adjusting nut threadedly connected to the rod section above the fixed frame, and the lower limit adjusting nut threadedly connected to the rod section below the insulating base.

[0022] Furthermore, the voltage release assembly includes an electromagnet installed within a fixed frame. The electromagnet has a hollow cylindrical structure. The upper half of the electromagnet's interior is provided with a first core inductor installed on an arc-suppressing insulating rod, and the lower half of the electromagnet's interior is provided with a second core inductor installed on the arc-suppressing insulating rod. The second core inductor passes through a coil base and is installed on an insulating base.

[0023] Furthermore, two of the four fixing rods pass through the coil base and are connected to a module mounting box; the control module is installed inside the module mounting box and is electrically connected to the electromagnet.

[0024] Furthermore, the second incoming line wiring assembly includes an insulating shed fixedly mounted on the arc-suppressing insulating rod, and a second incoming line contact; a quick-connect female is installed on the second incoming line contact, and the quick-connect female extends to the outside of the outer insulating cover.

[0025] Furthermore, the rectangular insulating frame is provided with a groove for cooperating with the second incoming contact.

[0026] The beneficial effects of this utility model are:

[0027] The application of this lightweight, electrically operated arc-suppression switch for disconnecting current transformer leads significantly improves safety and operational efficiency. Remote control reduces the risk of personnel approaching high-voltage equipment, minimizing personal injury accidents. The incoming contact reduces overvoltage risk, protecting both equipment and personnel. The internal arc-suppression device is fast and effective, reducing the risk of equipment damage and extending electrical life. Bypass connection ensures rapid and safe switching of lines during maintenance. The electromagnet design ensures stable voltage release, allowing the equipment to quickly return to normal operation. The external insulation cover and internal components are easy to inspect and maintain, facilitating management. Overall, this equipment offers significant advantages in safety, durability, and ease of maintenance, improving the operational efficiency and reliability of power equipment. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the overall structure of the lightweight electric arc suppression switch for disconnecting the leads of the current transformer according to this utility model.

[0029] Figure 2 and Figure 3 This is a schematic diagram of the internal structure of the lightweight electric arc suppression switch for disconnecting current transformer leads according to this utility model.

[0030] Figure 4 This is a schematic diagram of the internal arc-extinguishing device of this utility model;

[0031] Figure 5 This is a schematic diagram of the disassembled bottom structure of the internal arc-extinguishing device of this utility model;

[0032] Figure 6 This is a schematic diagram of the internal structure of the internal arc-extinguishing device of this utility model;

[0033] In the diagram, 1—external insulating cover; 2—vacuum switch chamber; 3—wire clamp; 4—internal arc suppression device; 5—arc suppression insulating rod; 6—control module; 7—wire clamp body; 8—inlet slot; 9—inlet clamping block; 10—lifting ring; 11—rectangular insulating frame; 12—coil base; 13—fixing rod; 14—fixing frame; 15—upper limit adjusting nut; 16—lower limit adjusting nut; 17—insulating base; 18—plug; 19—electromagnet; 20—first core sensor; 21—second core sensor; 22—module mounting box; 23—insulating skirt; 24—second inlet contact; 25—quick-connect female connector; 26—quick-connect male connector; 27—groove; 28—switch insulating block. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0035] To address the problems existing in the traditional method of using bypass cables and load switches to disconnect PT leads, this embodiment proposes a lightweight electric arc extinguishing switch for disconnecting current transformer leads. This lightweight electric arc extinguishing switch remotely controls the access and disconnection of incoming current. Based on the zero-point arc extinguishing principle, it operates with vacuum as the arc extinguishing medium, allowing the generation and extinguishing of the contact arc to occur in a vacuum.

[0036] Specifically, such as Figure 1 and Figure 2As shown, this lightweight electric arc-suppression switch for disconnecting current transformer leads comprises two parts: an external insulating cover 1 and an internal arc-suppression device 4. The external insulating cover 1 includes a hollow rectangular insulating frame 11, integrally molded from ceramic insulating material; it features a large creepage distance, high mechanical strength, high heat resistance, and impact resistance. A cylindrical external insulating cover 1 is detachably mounted on the outside of the rectangular insulating frame 11; the bottom of the rectangular insulating frame 11 is connected to a coil base 12, and the coil base 12, together with the external insulating cover 1, forms the space for the internal arc-suppression device 4.

[0037] like Figure 1 and Figure 2 As shown, the top of the outer insulating cover 1 is equipped with a first incoming line connection assembly for connecting to the high-voltage line. The first incoming line connection assembly includes a vacuum switch chamber 2 and a clamp 3. The vacuum switch chamber 2 is fixedly installed on the top of the outer insulating cover 1 and extends through the outer insulating cover 1 into it. The clamp 3 is installed on the top of the vacuum switch chamber 2. The clamp 3 includes a clamp body 7, and the clamp body 7 is provided with an incoming line groove 8. An incoming line clamping block 9 is threadedly installed at the incoming line groove 8. One end of the incoming line clamping block 9 is provided with a lifting ring 10. The vacuum switch chamber 2 is detachably installed on the high-voltage line through the clamp 3.

[0038] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the coil base 12 is connected to the fixing frame 14 via four fixing rods 13. The fixing frame 14 is located inside the outer insulating cover 1. The rectangular insulating frame 11 and the coil base 12 cooperate to form the installation space for the voltage release assembly. Figure 2 , Figure 3 and Figure 4 As shown, the internal arc-suppression device 4 is installed inside the external insulating cover 1 and can move vertically within the rectangular insulating frame 11 when a momentary high-voltage impact occurs during closing. The internal arc-suppression device 4 includes an arc-suppression insulating rod 5, a voltage release component installed on the lower section of the arc-suppression insulating rod 5, an insulating rod movement distance control component, a second incoming line connection component installed on the upper section of the arc-suppression insulating rod 5 to cooperate with the equipment incoming line access, a switch insulating block 28 installed on the top of the arc-suppression insulating rod 5 to cooperate with the vacuum switch chamber 2, and a control module 6 for controlling the access and disconnection of the incoming line current.

[0039] Among them, such as Figure 2 , Figure 3 and Figure 4As shown, the insulating rod movement distance adjustment assembly includes an upper limit adjusting nut 15, a lower limit adjusting nut 16, and an insulating base 17. The insulating base 17 is located below the coil base 12 and is slidably connected to the coil base 12 via two plugs 18. The arc-extinguishing insulating rod 5 passes sequentially through the fixed frame 14, the coil base 12, and the insulating base 17. The upper limit adjusting nut 15 is threaded onto the rod section above the fixed frame 14, and the lower limit adjusting nut 16 is threaded onto the rod section below the insulating base 17.

[0040] like Figure 4 , Figure 5 and Figure 6 As shown, the voltage release assembly includes an electromagnet 19 installed in the fixed frame 14. The electromagnet 19 has a hollow cylindrical structure. The upper half of the electromagnet 19 is provided with a first core inductor 20 installed on the arc-suppressing insulating rod 5, and the lower half of the electromagnet 19 is provided with a second core inductor 21 installed on the arc-suppressing insulating rod 5. The second core inductor 21 passes through the coil base 12 and is installed on the insulating base 17.

[0041] Considering the installation of control module 6, such as Figure 2 , Figure 4 , Figure 5 ,and Figure 6 As shown, two of the four fixing rods 13 pass through the coil base 12 and are connected to the bottom of the module mounting box 22; the control module 6 is installed inside the module mounting box 22 and is electrically connected to the electromagnet 19; the control module 6 has a battery for powering the electromagnet 19 and a remote control circuit board inside, and the function of the control module 6 is to control the power supply of the electromagnet 19.

[0042] like Figure 4 As shown, the second incoming line wiring assembly includes an insulating skirt 23 fixedly mounted on the arc-suppressing insulating rod 5, and a second incoming line contact 24; as Figure 1 , Figure 2 and Figure 3 As shown, a quick-connect female connector 25 is installed on the second incoming contact 24, and the quick-connect female connector 25 extends outside the outer insulating cover 1. The equipment wires can be quickly plugged and unplugged into the quick-connect female connector 25 on the second incoming contact 24 via the quick-connect male connector 26.

[0043] The working principle of this lightweight electric arc suppression switch that disconnects the current transformer leads is as follows:

[0044] Using the lifting ring 10, the high-voltage wire is quickly installed into the inlet slot 8 on the clamp body 7, and the high-voltage wire is held in place by the inlet clamping block 9 in conjunction with the clamp body 7. At this time, the high-voltage wire is electrically connected to the vacuum switch chamber 2. The quick-connect female connector 25 on the second inlet contact 24 is plugged into the quick-connect male connector 26 of the equipment wire, and after connecting the equipment wire to form a bypass connection, the main circuit is disconnected.

[0045] Then, after the electromagnet 19 is charged by the control module 6, the high-voltage current enters the core inductor, and the full voltage of the input line generates a momentary high-voltage surge. This causes the arc-suppressing insulating rod 5 to move the first core inductor 20, the second core inductor 21, the insulating base 17, the second input contact 24, and the switch insulating block 28 upwards. The switch insulating block 28 strikes the vacuum switch chamber 2, achieving closing and thus extinguishing the arc. The distance between the coil base 12 and the insulating base 17 is the moving distance of the arc-suppressing insulating rod 5. The arc-suppressing process does not require close-range manual operation, greatly improving safety. After closing, the coil is de-energized, and the electromagnet 19 attracts the core inductor to form a circuit, maintaining a stable and reliable voltage release. The device is then removed after the operation is completed.

[0046] In addition, to avoid excessive impact force on the outer insulation cover 1 when the second incoming contact 24 moves upward with the arc-extinguishing insulating rod 5, such as... Figure 2 and Figure 3 As shown, in this embodiment, a groove 27 is provided on the rectangular insulating frame 11 to accommodate the second incoming contact 24.

[0047] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A lightweight electric arc-suppression switch for disconnecting current transformer leads, characterized in that: Includes an external insulating cover and an internal arc-suppression device; The top of the external insulating cover is equipped with a first incoming line connection assembly for connecting to the high-voltage line. The first incoming line connection assembly includes a vacuum switch chamber and a clamp. The internal arc-extinguishing device is installed inside the external insulating cover and can move vertically inside the external insulating cover when a momentary high-voltage impact occurs during closing. It includes an arc-extinguishing insulating rod, a voltage release assembly and an insulating rod movement distance control assembly installed on the lower section of the arc-extinguishing insulating rod, a second incoming line connection assembly installed on the upper section of the arc-extinguishing insulating rod for connecting to the equipment incoming line, a switch insulating block installed on the top of the arc-extinguishing insulating rod for connecting to the vacuum switch chamber, and a control module for controlling the connection and disconnection of the incoming line current.

2. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 1, characterized in that: The first incoming line wiring assembly includes a vacuum switch chamber, which is fixedly installed on the top of the outer insulating cover and extends through the outer insulating cover into it. A wire clamp is installed on the top of the vacuum switch chamber, which is detachably installed on the high-voltage line through the wire clamp.

3. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 2, characterized in that: The wire clamp includes a wire clamp body, which has a wire inlet groove, and a wire inlet clamping block is threadedly installed at the wire inlet groove. One end of the wire inlet clamping block is provided with a lifting ring.

4. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 1, characterized in that: The external insulating cover includes a hollow rectangular insulating frame, and a cylindrical external insulating cover is detachably installed on the outside of the rectangular insulating frame; the bottom of the rectangular insulating frame is connected to the coil base, and the coil base and the rectangular insulating frame cooperate to form a space for the internal arc suppression device to be installed.

5. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 4, characterized in that: The coil base is connected to the fixing frame by four fixing rods. The fixing frame is located inside the rectangular insulating frame. The rectangular insulating frame and the coil base cooperate to form the installation space for the voltage release component.

6. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 5, characterized in that: The insulating rod movement distance control assembly includes an upper limit adjusting nut, a lower limit adjusting nut, and an insulating base; the insulating base is located below the coil base and is slidably connected to the coil base via two plugs; the arc-extinguishing insulating rod passes through the fixed frame, the coil base, and the insulating base in sequence, with the upper limit adjusting nut threadedly connected to the rod section above the fixed frame, and the lower limit adjusting nut threadedly connected to the rod section below the insulating base.

7. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 6, characterized in that: The voltage release assembly includes an electromagnet installed in a fixed frame. The electromagnet has a hollow cylindrical structure. The upper half of the electromagnet is provided with a first core inductor installed on the arc-suppressing insulating rod, and the lower half of the electromagnet is provided with a second core inductor installed on the arc-suppressing insulating rod. The second core inductor passes through the coil base and is installed on the insulating base.

8. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 7, characterized in that: Two of the four fixing rods pass through the coil base and are connected to the module mounting box; the control module is installed inside the module mounting box and is electrically connected to the electromagnet.

9. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 1, characterized in that: The second incoming line wiring assembly includes an insulating shed fixedly mounted on the arc-suppressing insulating rod, and a second incoming line contact; a quick-connect female is installed on the second incoming line contact, and the quick-connect female extends to the outside of the outer insulating cover.

10. The lightweight electric arc suppression switch for disconnecting current transformer leads according to claim 4, characterized in that: The rectangular insulating frame is provided with a groove for the second incoming contact.

Images