Light-weight electric arc extinction switch capable of disconnecting mutual inductor lead simultaneously

Abstract

The invention discloses a light electric arc extinction switch capable of disconnecting mutual inductor leads synchronously, and relates to the technical field of power system automation equipment. 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 matched with the access of a high-voltage incoming line, and the incoming line wiring assembly comprises a vacuum switch chamber; 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 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] The invention relates to the technical field of power system automation equipment, in particular to a light electric arc-extinguishing switch for synchronously disconnecting transformer leads. Background Art

[0002] In the power distribution automation, the traditional method of disconnecting the voltage transformer (PT) leads generally requires a short power outage to facilitate operations such as PT fuse replacement and line maintenance. However, the current mainstream technical method usually relies on the coordination of bypass cables and load switches to implement the disconnection of PT leads. This method has several significant problems, as follows:

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

[0004] The bypass cable system is generally designed to be bulky, which makes it difficult to carry and install during on-site operations. In certain restricted working environments, operators face physical challenges when carrying and installing equipment, which in turn affects overall operating efficiency and increases workers' labor intensity and safety risks.

[0005] 2. The lead spacing of the transformer is narrow

[0006] The layout of PT leads is usually compact, which makes it very difficult to fix the bypass cable due to limited space. Due to the small lead spacing, the stability of the bypass system is seriously affected, which can easily lead to the loosening of the equipment during operation, thus causing safety hazards and operational errors.

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

[0008] Generally speaking, the bypass cable is usually longer than 15 meters and is relatively heavy, which is insufficient for 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, which may cause equipment damage or operational errors.

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

[0010] Most bypass load switches require manual operation, which increases the time cost and complexity of the operation. In addition, manual operation is prone to human errors, and in high-load and high-voltage environments, the safety and reliability of manual operation are worthy of attention.

[0011] 5. There is a risk of electric arc

[0012] In the traditional disconnection process, especially at the moment of load switching and disconnection, arcing may occur. The high temperature generated by the arc poses a great threat to the contact parts and insulating materials, and may cause contact damage, insulation material breakdown and other problems. In addition, the arc will increase the risk of short-circuit failure, and in severe cases may cause contact burning, or even fire or explosion, greatly endangering equipment safety and personnel life.

[0013] The above-mentioned problems significantly limit the promotion of power distribution network automation circuit breakers, resulting in reduced power supply reliability and increased maintenance costs. Therefore, the development of more efficient and safe disconnection technologies and equipment is of great significance to improving the automation level of power systems and ensuring power supply safety. Summary of the invention

[0014] In view of the above problems, the present invention proposes a light electric arc extinguishing switch for synchronously disconnecting the leads of a transformer. The light electric arc extinguishing switch is based on the zero-point arc extinguishing principle and works with vacuum as the arc extinguishing medium, so that the generation and extinguishing of the contact arc are carried out in a vacuum. The arc extinguishing process does not require close manual operation, which greatly improves safety.

[0015] The technical solution adopted by the present invention is:

[0016] A light electric arc extinguishing switch for synchronously disconnecting a transformer lead wire, comprising an external insulating cover and an internal arc extinguishing device;

[0017] A first incoming wiring assembly for high-voltage incoming line access is installed on the top of the external insulating cover, and the incoming wiring assembly includes a vacuum switch chamber; the internal arc extinguishing device is installed in the external insulating cover, and can move vertically in the external insulating cover when an instantaneous high-voltage impact is generated by closing the switch, and 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 body, a second incoming wiring assembly installed on the upper section of the arc-extinguishing insulating rod body to cooperate with the equipment incoming line access, a switch insulating block installed on the top of the arc-extinguishing insulating rod to cooperate with the vacuum switch chamber, and a control module for controlling the connection and disconnection of the incoming line current;

[0018] The light electric arc-extinguishing switch remotely controls the connection and disconnection of the incoming line current. It is based on the zero-point arc-extinguishing principle and works with vacuum as the arc-extinguishing medium, so that the generation and extinguishing of the contact arc are carried out in a vacuum.

[0019] Furthermore, the first incoming line wiring assembly includes a vacuum switch chamber, which is fixedly installed on the top of the external insulating cover and extends through the external insulating cover to the inside thereof. A first incoming line contact is installed on the top of the vacuum switch chamber by a hexagonal screw, and the first incoming line contact is connected to the high-voltage incoming line.

[0020] Furthermore, the external insulating cover is a hollow rectangular frame structure, and the external insulating cover is made of a porcelain insulating material in one piece; the bottom of the external insulating cover is connected to the coil base, and the coil base and the external insulating cover cooperate to form a space for installing the internal arc extinguishing device.

[0021] Furthermore, the coil base is connected to a fixing frame via four fixing rods, the fixing frame is located in an external insulating cover, and the external insulating cover cooperates with the coil base to form an installation space for a voltage release component.

[0022] Furthermore, the insulating rod moving distance control assembly includes an upper limit adjustment nut, a lower limit adjustment nut and an insulating base; the insulating base is located below the coil base, and is connected to the coil base through two plugs; the arc-extinguishing insulating rod passes through the fixed frame, the coil base and the insulating base in sequence, and the upper limit adjustment nut is threadedly connected to the rod body section above the fixed frame, and the lower limit adjustment nut is threadedly connected to the rod body section below the insulating base.

[0023] Furthermore, the voltage release component includes an electromagnet installed in a fixed frame, the electromagnet is a hollow cylindrical structure, the upper half of the electromagnet is provided with a first core inductance installed on the arc-extinguishing insulating rod, and the lower half is provided with a second core inductance installed on the arc-extinguishing insulating rod; the high-resistance coil is installed on the insulating base through the coil base.

[0024] Furthermore, two of the four fixing rods pass through the coil base and are connected to the module base; the control module is installed on the module base and is electrically connected to the electromagnet.

[0025] Furthermore, the second incoming line wiring assembly includes an insulating shed fixedly mounted on the arc-extinguishing insulating rod, and a second incoming line contact, and the first incoming line contact extends to the outside of the external insulating cover.

[0026] Furthermore, the outer insulating cover is provided with an embedding groove for matching the second incoming contact.

[0027] An arc extinguishing method for synchronously disconnecting transformer leads, the arc extinguishing method is based on the above-mentioned light electric arc extinguishing switch for synchronously disconnecting transformer leads, and comprises the following steps:

[0028] Step 1: Check whether the external insulation cover of the light electric arc extinguishing switch that disconnects the transformer leads is intact, apply a small amount of vaseline oil to the mechanical friction part of the internal arc extinguishing device, check the power of the control module remote control, and confirm whether the limit adjustment nut of the internal arc extinguishing device is tightened and not loose;

[0029] Step 2: The operator wears insulation protection equipment and checks whether all connectors of the voltage circuit are loose or broken, and confirms that the disconnected PT lead to be repaired and the connected power equipment are in good condition;

[0030] Step 3: Connect the equipment. The operator disconnects the PT lead, connects the PT lead to the first incoming contact, connects the lead of the power equipment to be repaired to the second incoming contact, and confirms that the inclination of the installation surface to the vertical surface is no more than 15° to ensure the stability of the equipment.

[0031] Step 4: Cut off the line to be repaired between the high-voltage wire and the power equipment. The operator moves away from the work area to a safe and open area and uses a remote control to operate the control module. The control module controls the electromagnet to be energized. The core inductance inside the electromagnet drives the arc-extinguishing insulating rod to move, so that the switch insulating block moves into the vacuum switch chamber to perform arc-extinguishing action and eliminate the generated arc.

[0032] Step 5: After the arc extinguishing action is completed, the operator repairs the line and restores the connection of the disconnected PT lead wire as it was;

[0033] Step 6: The operator moves away to a safe and open area again, uses the remote control to operate the control module to exit the light electric arc-extinguishing switch that disconnects the transformer leads synchronously, and after confirming that the surrounding environment is safe, recover the equipment and perform subsequent operations.

[0034] The light electric arc-extinguishing switch for synchronously disconnecting the transformer leads has the following significant beneficial effects:

[0035] 1. Improve safety: Use remote control to operate, reduce the risk of operators approaching high-voltage equipment, and reduce the probability of personal safety accidents.

[0036] 2. Reduce overvoltage risk: The incoming line contacts are made of wear-resistant and low-cutoff value materials, which can effectively reduce the overvoltage caused by cutoff during the breaking process and protect equipment and personnel.

[0037] 3. Effective arc extinguishing: The internal arc extinguishing device can achieve fast and effective arc extinguishing action, thereby reducing the risk of equipment damage and increasing the electrical life of the equipment.

[0038] 4. Diversified operation modes: Supports multiple operation modes, such as remote control and manual operation, adapting to different working environments and personnel needs, and improving the flexibility of the equipment.

[0039] 5. Durability of machine components: The use of materials with high mechanical strength to manufacture the insulation cover and other components improves the overall durability of the device and reduces the frequency of maintenance and replacement.

[0040] 6. Efficient bypass connection: Bypass connection is achieved through disconnect cord, ensuring that line switching can be completed quickly and safely during maintenance, improving work efficiency.

[0041] 7. Reliable voltage stability: The design of the electromagnet ensures the stable release of voltage and forms a reliable path, so that the power equipment can resume normal operation in time after maintenance.

[0042] 8. Easy to maintain and inspect: The external insulation cover and internal mechanical parts are easy to inspect and maintain, and the operator can quickly understand the status of the device to better manage and maintain the equipment.

[0043] In summary, the application of this light electric arc-extinguishing switch in the synchronous disconnection of transformer leads not only has significant advantages in improving safety, reducing operational risks and effectively extinguishing arcs, but also enhances the durability and maintenance convenience of the equipment, ultimately improving the overall operating efficiency and reliability of power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0045] Figure 1 It is a schematic diagram of the overall structure of a light electric arc-extinguishing switch for synchronously disconnecting and connecting transformer leads of the present invention;

[0046] Figure 2 It is a schematic diagram of the overall structure of the internal arc extinguishing device of the present invention;

[0047] Figure 3 It is a schematic diagram of the bottom split structure of the internal arc extinguishing device of the present invention;

[0048] Figure 4 It is a schematic diagram of the internal structure of the internal arc extinguishing device of the present invention;

[0049] In the figure, 1 is the first incoming contact; 2 is the hexagonal screw; 3 is the vacuum switch chamber; 4 is the external insulating cover; 5 is the switch insulating block; 6 is the second incoming contact; 7 is the arc-extinguishing insulating rod; 8 is the fixing frame; 9 is the electromagnet; 10 is the control module; 11 is the coil base; 12 is the insulating base; 13 is the module base; 14 is the upper limit adjustment nut; 15 is the fixing rod; 16 is the plug; 17 is the insulating umbrella skirt; 18 is the embedded groove; 19 is the first core induction; 20 is the second core induction; 21 is the lower limit adjustment nut. DETAILED DESCRIPTION

[0050] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0051] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features and technical solutions in the embodiments can be combined with each other without conflict. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0052] In view of the problems existing in the disconnection of PT leads implemented by the cooperation of traditional bypass cables and load switches, this embodiment proposes a light electric arc-extinguishing switch for synchronously disconnecting the transformer leads. The light electric arc-extinguishing switch for synchronously disconnecting the transformer leads remotely controls the connection and disconnection of the incoming current. It is based on the zero-point arc extinguishing principle, and works with vacuum as the arc extinguishing medium, so that the generation and extinguishing of the contact arc are carried out in a vacuum, and works with vacuum as the arc extinguishing medium.

[0053] Specifically, Figure 1 As shown, the light electric arc-extinguishing switch for synchronously disconnecting the transformer leads includes two parts: an external insulating cover 4 and an internal arc-extinguishing device. The external insulating cover 4 is a hollow rectangular frame structure, and the external insulating cover 4 is made of a porcelain insulating material in one piece; it has the characteristics of large creepage distance, high mechanical strength, high heat resistance and impact resistance. The bottom of the external insulating cover 4 is connected to the coil base 11, and the coil base 11 and the external insulating cover 4 cooperate to form a space for installing the internal arc-extinguishing device. Figure 1 As shown, the top of the external insulating cover 4 is installed with a first incoming line wiring assembly that cooperates with the high-voltage incoming line access. The first incoming line wiring assembly includes a vacuum switch chamber 3. The vacuum switch chamber 3 is fixedly installed on the top of the external insulating cover 4 and extends through the external insulating cover 4 to the inside. The top of the vacuum switch chamber 3 is installed with a first incoming line contact 1 through a hexagonal screw 2. The first incoming line contact 1 is connected to the high-voltage incoming line. The first incoming line contact 1 is made of wear-resistant and low-cutoff value material. In this way, while meeting the breaking performance, it reduces the overvoltage caused by the cutoff during the breaking process and increases the electrical life of the internal arc extinguishing device. Figure 1 and Figure 2 As shown, the coil base 11 is connected to the fixing frame 8 through four fixing rods 15. The fixing frame 8 is located in the external insulating cover 4. The external insulating cover 4 and the coil base 11 cooperate to form a voltage release component installation space.

[0054] like Figure 2 and Figure 3As shown, the internal arc extinguishing device is installed in the external insulating cover 4, and can move vertically in the external insulating cover 4 when the switch generates an instantaneous high voltage impact. The internal arc extinguishing device includes an arc extinguishing insulating rod 7, a voltage release component and an insulating rod movement distance control component installed on the lower section of the arc extinguishing insulating rod 7, a second incoming line wiring component installed on the upper section of the arc extinguishing insulating rod 7 to cooperate with the equipment incoming line access, a switch insulating block 5 installed on the top of the arc extinguishing insulating rod 7 to cooperate with the vacuum switch chamber 3, and a control module 10 for controlling the connection and disconnection of the incoming line current.

[0055] Among them, Figure 2 , Figure 3 and Figure 4 As shown, the insulating rod moving distance control assembly includes an upper limit adjustment nut 14, a lower limit adjustment nut 21 and an insulating base 12; the insulating base 12 is located below the coil base 11 and is connected to the coil base 11 through two plugs 16. The arc-extinguishing insulating rod 7 passes through the fixed frame 8, the coil base 11 and the insulating base 12 in sequence, and the upper limit adjustment nut 14 is threadedly connected to the rod body section above the fixed frame 8, and the lower limit adjustment nut 21 is threadedly connected to the rod body section below the insulating base 12.

[0056] like Figure 2 , Figure 3 and Figure 4 As shown, the voltage release component includes an electromagnet 9 installed in a fixed frame 8. The electromagnet 9 is a hollow cylindrical structure. The upper half of the electromagnet 9 is provided with a first core inductance 19 installed on the arc-extinguishing insulating rod 7, and the lower half of the electromagnet 9 is provided with a second core inductance 20 installed on the arc-extinguishing insulating rod 7; the high-resistance coil passes through the coil base 11 and is installed on the insulating base 12.

[0057] Considering the installation of the control module 10, Figure 2 , Figure 3 and Figure 4 As shown, two of the four fixing rods 15 pass through the coil base 11 and are connected to the module base 13; the control module 10 is installed on the module base 13, and is electrically connected to the electromagnet 9; the control module 10 is provided with a battery for powering the electromagnet 9 and a remote control circuit board, and the function of the control module 10 is to control the on and off of the electromagnet 9.

[0058] like Figure 2 As shown, the second incoming line wiring assembly includes an insulating shed 17 fixedly sleeved on the arc-extinguishing insulating rod 7, and a second incoming line contact 6, and the first incoming line contact 1 extends to the outside of the external insulating cover 4.

[0059] The functions of the above components of the light electric arc-extinguishing switch for disconnecting the transformer leads are as follows:

[0060] External insulation cover 4: provides overall protection and insulation, forms the installation space of the internal arc extinguishing device, and has high heat resistance, high mechanical strength and good creepage distance to ensure the safe operation of the equipment. First incoming line wiring assembly: realizes the access of high-voltage incoming line, including vacuum switch chamber 3, provides switch and current control functions; by using the joint of wear-resistant and low current-cutting material, it reduces the occurrence of overvoltage and prolongs the service life of the equipment. Coil base 11: supports and fixes the internal components, cooperates with the external insulation cover 4, forms the installation space of the voltage release component, ensures the stability of each component and the normal realization of its function. Fixed frame 8: provides fixed support for the voltage release component and other internal components to ensure their stability during operation. Arc extinguishing insulation rod 7: as the core component of the entire internal arc extinguishing device, it carries the voltage release component and control module 10, and also carries the connection with other components. Voltage release component: realizes the control and release of current through the magnetic force of electromagnet 9; when the current needs to be cut off, the voltage release component plays an important role to ensure the safe current management of the equipment. Insulating rod movement distance control component: adjusts the movement range of the arc-extinguishing insulating rod 7 to ensure that it works within the appropriate operating distance and avoids failures caused by excessive or small displacement. Control module 10: manages the on and off operation of the electromagnet 9. It is equipped with a battery and a remote control circuit board to realize the functions of remote monitoring and control and enhance the intelligence of the equipment. Second incoming line wiring component: cooperates with the equipment incoming line access to realize secondary power connection, ensure the smooth transmission of current, and provide insulation protection to prevent leakage. Electromagnet 9: As a key working element, it controls the operation of the current switch through the principle of electromagnetic induction to ensure the release and cutoff of voltage. High-resistance coil: participates in voltage control through the working principle, cooperates with other components to realize the switching function, and strengthens internal electromagnetic control.

[0061] The working principle of the light electric arc-extinguishing switch for synchronous disconnection of transformer leads is as follows:

[0062] Connect the first incoming contact 1 to the high-voltage incoming line, connect the second incoming contact 6 to the equipment wire, form a bypass connection and then cut off the main circuit; after the control module 10 charges the electromagnet 9, the incoming high-voltage current enters the core inductance, and the full incoming voltage produces an instantaneous high-voltage shock, so that the arc-extinguishing insulating rod 7 drives the first core inductance 19, the second core inductance 20, the insulating base 12, the second incoming contact 6 and the switch insulating block 5 to move upward, and the switch insulating block 5 hits the vacuum switch chamber 3 to achieve closing and achieve arc extinguishing; the distance between the coil base 11 and the insulating base 12 is the moving distance of the arc-extinguishing insulating rod 7; the arc extinguishing process does not require manual close-range operation, which greatly improves safety. After closing, the coil is de-energized, and the electromagnet 9 magnet attracts the core inductance to form a path, keeping the voltage stable and reliable, and the device is withdrawn after the operation is completed.

[0063] In addition, in order to prevent the second incoming contact 6 from moving upward with the arc-extinguishing insulating rod 7 and causing damage to the external insulating cover 4 due to excessive impact force, the external insulating cover 4 is preferably Figure 1 As shown, in this embodiment, an embedding groove 18 for matching the second incoming contact 6 is provided on the outer insulating cover 4.

[0064] Based on the above light electric arc extinguishing switch for synchronously disconnecting the transformer leads, this embodiment also proposes an arc extinguishing method for synchronously disconnecting the transformer leads, and the arc extinguishing method includes the following steps:

[0065] Step 1, check whether the external insulation cover 4 of the light electric arc extinguishing switch that disconnects the transformer lead wire at the same time is intact, apply a small amount of vaseline oil to the mechanical friction part of the internal arc extinguishing device, check the power of the remote control of the control module 10, and confirm whether the limit adjustment nut of the internal arc extinguishing device is tightened without looseness;

[0066] Step 2: The operator wears insulation protection equipment and checks whether all connectors of the voltage circuit are loose or broken, and confirms that the disconnected PT lead to be repaired and the connected power equipment are in good condition;

[0067] Step 3, connect the equipment. The operator disconnects the PT lead, connects the PT lead to the first incoming contact 1, connects the lead of the power equipment to be repaired to the second incoming contact 6, and confirms that the inclination of the installation surface and the vertical surface is not greater than 15° to ensure the stability of the equipment;

[0068] Step 4: Cut off the line to be repaired between the high-voltage wire and the power equipment. The operator moves away from the work area to a safe and open area, and uses the remote control to operate the control module 10 to send high-voltage current into the coil to actively extinguish the arc. The internal arc extinguishing device immediately performs the arc extinguishing action to eliminate the generated arc.

[0069] Step 5: After the arc extinguishing action is completed, the operator repairs the line and restores the connection of the disconnected PT lead wire as it was;

[0070] Step 6: The operator moves away to a safe and open area again, and uses the remote control to operate the control module 10 to exit the light electric arc extinguishing switch that disconnects the transformer leads at the same time. After confirming that the surrounding environment is safe, the equipment is recovered and subsequent operations are performed.

[0071] In summary, the light electric arc-extinguishing switch for synchronous disconnection of the transformer leads determines the arc-extinguishing capacity of the device according to the size of the PT load current. It is small in size and light in weight, easy to carry and meets the operation requirements. The device disconnection soft wire is light and soft, which is convenient for connection to the PT lead; it replaces the traditional bypass system and saves the equipment investment cost. The electric synchronous opening and closing and locking process does not require manual operation by personnel, which eliminates the misoperation caused by the skill level of the personnel; the electric locking avoids the problem of non-locking caused by the negligence of the operator, and improves safety and work efficiency. The lead of the device can be disconnected with an operating rod, or it can be disconnected directly by wearing insulating gloves, and it can also be used in operation scenarios with a narrow phase-to-phase distance. The light electric arc-extinguishing switch improves the feasibility of live operations such as disconnecting PT leads, replacing PT fuses, and removing old PT circuit breakers, avoiding power outages and improving power supply reliability.

[0072] At the same time, it should be pointed out that the above description is only a typical embodiment of the present invention and does not limit the present invention in any form. Any changes made to the above embodiments based on the ideas and technical essence of the present invention are within the protection scope of the present invention.

Claims

1. A light electric arc-extinguishing switch for synchronously disconnecting transformer leads, characterized in that: Includes external insulating cover and internal arc extinguishing device; A first incoming wiring assembly for high-voltage incoming line access is installed on the top of the external insulating cover, and the incoming wiring assembly includes a vacuum switch chamber; the internal arc extinguishing device is installed in the external insulating cover, and can move vertically in the external insulating cover when an instantaneous high-voltage impact is generated by closing the switch, and 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 body, a second incoming wiring assembly installed on the upper section of the arc-extinguishing insulating rod body to cooperate with the equipment incoming line access, a switch insulating block installed on the top of the arc-extinguishing insulating rod to cooperate with the vacuum switch chamber, and a control module for controlling the connection and disconnection of the incoming line current; The light electric arc-extinguishing switch remotely controls the connection and disconnection of the incoming line current. It is based on the zero-point arc-extinguishing principle and works with vacuum as the arc-extinguishing medium, so that the generation and extinguishing of the contact arc are carried out in a vacuum.

2. The light electric arc-extinguishing switch for synchronously disconnecting transformer leads according to claim 1 is characterized in that: The first incoming line wiring assembly includes a vacuum switch chamber, which is fixedly installed on the top of the external insulating cover and extends through the external insulating cover to the inside. A first incoming line contact is installed on the top of the vacuum switch chamber by a hexagonal screw, and the first incoming line contact is connected to the high-voltage incoming line.

3. The light electric arc-extinguishing switch for synchronously disconnecting transformer leads according to claim 1 is characterized in that: The external insulating cover is a hollow rectangular frame structure, and the external insulating cover is made of porcelain insulating material in one piece; the bottom of the external insulating cover is connected to the coil base, and the coil base and the external insulating cover cooperate to form a space for installing the internal arc extinguishing device.

4. The light electric arc-extinguishing switch for synchronously disconnecting transformer leads according to claim 3 is characterized in that: The coil base is connected to a fixing frame via four fixing rods. The fixing frame is located in an external insulating cover. The external insulating cover cooperates with the coil base to form an installation space for a voltage release component.

5. The light electric arc-extinguishing switch for synchronously disconnecting transformer leads according to claim 4 is characterized in that: The insulating rod moving distance control assembly includes an upper limit adjustment nut, a lower limit adjustment nut and an insulating base; the insulating base is located below the coil base and is 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, and the upper limit adjustment nut is threadedly connected to the rod body section above the fixed frame, and the lower limit adjustment nut is threadedly connected to the rod body section below the insulating base.

6. The light electric arc-extinguishing switch for synchronously disconnecting the transformer leads according to claim 5, characterized in that: The voltage release component includes an electromagnet installed in a fixed frame. The electromagnet is a hollow cylindrical structure. The upper half of the electromagnet is provided with a first core inductance installed on an arc-extinguishing insulating rod, and the lower half is provided with a second core inductance installed on the arc-extinguishing insulating rod; the high-resistance coil is installed on the insulating base through the coil base.

7. The light electric arc-extinguishing switch for synchronously disconnecting transformer leads according to claim 6, characterized in that: Two of the four fixing rods pass through the coil base and are connected to the module base; the control module is installed on the module base and is electrically connected to the electromagnet.

8. The light electric arc-extinguishing switch for synchronously disconnecting transformer leads according to claim 1 is characterized in that: The second incoming line wiring assembly includes an insulating shed fixedly sleeved on the arc-extinguishing insulating rod, and a second incoming line contact, and the first incoming line contact extends to the outside of the external insulating cover.

9. The light electric arc-extinguishing switch for synchronously disconnecting transformer leads according to claim 8, characterized in that: The outer insulating cover is provided with an embedding groove matching the second incoming line contact.

10. An arc extinguishing method for synchronously disconnecting transformer leads, the arc extinguishing method is based on the light electric arc extinguishing switch for synchronously disconnecting transformer leads as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Check whether the external insulation cover of the light electric arc extinguishing switch that disconnects the transformer leads is intact, apply a small amount of vaseline oil to the mechanical friction part of the internal arc extinguishing device, check the power of the control module remote control, and confirm whether the limit adjustment nut of the internal arc extinguishing device is tightened and not loose; Step 2: The operator wears insulation protection equipment and checks whether all connectors of the voltage circuit are loose or broken, and confirms that the disconnected PT lead to be repaired and the connected power equipment are in good condition; Step 3: Connect the equipment. The operator disconnects the PT lead, connects the PT lead to the first incoming contact, connects the lead of the power equipment to be repaired to the second incoming contact, and confirms that the inclination of the installation surface to the vertical surface is no more than 15° to ensure the stability of the equipment. Step 4: Cut off the line to be repaired between the high-voltage wire and the power equipment. The operator moves away from the work area to a safe and open area and uses a remote control to operate the control module. The control module controls the electromagnet to be energized. The core inductance inside the electromagnet drives the arc-extinguishing insulating rod to move, so that the switch insulating block moves into the vacuum switch chamber to perform arc-extinguishing action and eliminate the generated arc. Step 5: After the arc extinguishing action is completed, the operator repairs the line and restores the connection of the disconnected PT lead wire as it was; Step 6: The operator moves away to a safe and open area again, uses the remote control to operate the control module to exit the light electric arc-extinguishing switch that disconnects the transformer leads synchronously, and after confirming that the surrounding environment is safe, recover the equipment and perform subsequent operations.

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