Tower-mounted large-current-carrying simplified transmission direct-current deicing automatic short-circuit control system for power transmission line

Abstract

The invention discloses a tower-mounted large-current-carrying simplified transmission direct-current deicing automatic short-circuit control system for a power transmission line, and relates to the technical field of power system deicing. According to the system, automatic short circuit and ice melting of any two-phase wires or wires and ground wires of a power transmission line are realized through tower-mounted integrated design. The core innovation points are as follows: a simple structure of transmission of an electric push rod and a gear rack is adopted, full-automatic opening and closing control of a moving contact and a static contact is realized, and remote control and real-time state feedback are supported; through the sealing protection design, stable operation of the equipment in a severe environment is ensured; the ground wire leading-down subsystem is combined with remote disconnecting link control, the potential safety hazard of a long leading-down wire is eliminated, and the requirements of leading-wire and ground-wire collaborative ice melting are met at the same time. The system has the advantages that manual tower climbing operation is avoided, the high-altitude operation risk is reduced, transmission is efficient, the fault rate is low, long-term operation is adapted, light-weight design is adapted to various tower types, the installation cost is reduced, the protection performance is high, and the maintenance requirement is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power operation and maintenance, and particularly to a tower-mounted large-current streamlined drive DC ice melting automatic short-circuit control system for transmission lines. Background Art

[0002] Traditional ice melting devices mostly rely on substation or specific tower types for installation, resulting in limited ice melting range and difficulty in flexibly covering complex terrains or different tower type lines. At the same time, after long-term idleness, the devices are prone to mechanical jamming, electrical component aging and other faults, and need to be regularly maintained to ensure reliability, increasing the operation and maintenance costs. In addition, during the ice melting process, manual climbing of the tower is required to operate the disconnecting switch or switchgear, posing a risk of falling from height; some solutions use long down-leads to lead the ground wire to the ground, which may expand the live range of the tower pole and threaten the safety of operation and maintenance personnel and the public.

[0003] Existing devices mostly only support single ice melting modes for conductors or ground wires, unable to meet the requirements of coordinated ice melting of conductors and ground wires, and lacking the ability of rapid switching, making it difficult to adapt to complex ice conditions. Their mechanical drive systems generally adopt redundant structures such as multi-stage gears and chains, which are prone to rust or wear after long-term exposure to harsh environments, resulting in a decrease in drive efficiency or even jamming, and great difficulty in overhaul and maintenance. In addition, the current-carrying capacity of the devices is insufficient, making it difficult to meet the large-current ice melting requirements during extreme icing, and the current-carrying time is limited, unable to achieve continuous ice melting, affecting the ice melting effect. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a tower-mounted large-current streamlined drive DC ice melting automatic short-circuit control system for transmission lines, which provides a safe, efficient and flexible solution for ice melting of transmission lines through structural innovation and function integration, significantly improving the ability of the power grid to cope with extreme ice disasters.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A tower-mounted large-current streamlined drive DC ice melting automatic short-circuit control system for transmission lines, including a closing system, a moving contact, a static contact, a conductor ice melting system and a conductor-ground wire ice melting system. The low-voltage power supply cabinet is electrically connected to the closing system through a wire. The closing system is installed on the transmission tower and connected to the moving contact. A static contact is correspondingly arranged on the side of the moving contact and installed on the transmission tower. The end of the static contact is electrically connected to the conductor ice melting system and the conductor-ground wire ice melting system through wires.

[0006] In a preferred solution, a PLC control board is arranged inside the low-voltage power supply cabinet, and the PLC control board is electrically connected to an external controller through a control wire.

[0007] In a preferred embodiment, the closing system includes a bottom plate, on which a first support angle steel, a second support angle steel, and a third support angle steel are provided. A first electric push rod is installed below the first support angle steel, a second electric push rod is installed on the second support angle steel, and an insulating push rod is installed on the third support angle steel.

[0008] In a preferred embodiment, the first electric push rod is connected to a push rod connecting lock ring, the first electric push rod is vertically connected to the bottom plate and abuts against the first support angle steel. The second electric push rod is connected to the insulating push rod through a first telescopic rod. The other end of the insulating push rod is connected to a toothed plate, and the toothed plate, the insulating push rod, and the first telescopic rod are coaxially arranged.

[0009] In a preferred embodiment, a transmission gear is arranged below the toothed plate and meshes with the toothed plate. A third electric push rod is installed at the axis center of the transmission gear. The third electric push rod is connected to a moving contact through a second telescopic rod, and a lock is arranged on the side of the second telescopic rod.

[0010] In a preferred embodiment, the moving contact includes a moving contact conducting rod, a spring support plate, and a moving contact spring; one end of the moving contact conducting rod is fixedly connected to the second telescopic rod, the other end of the moving contact conducting rod is vertically connected to the spring support plate, the spring support plate is elastically connected to the moving contact through the moving contact spring, and the contact conducting rod is electrically connected to the low-voltage power supply cabinet through a power line.

[0011] In a preferred embodiment, the static contact includes a static contact head, a protective cover, a grading ring, a drainage wire, an insulating column, a support rod, and a drainage wire clamp; the grading ring is connected to the insulating column through the support rod, the other end of the insulating column is installed on the transmission tower and corresponds to the position of the moving contact. The static contact head is installed on the side of the grading ring. A protective cover is arranged above the static contact head. The bottom of the grading ring is connected to a drainage wire clamp, and a drainage wire is connected to the drainage wire clamp. The drainage wire, the drainage wire clamp, the grading ring, and the static contact head are electrically connected to each other.

[0012] In a preferred embodiment, the conductor de-icing system includes a current-carrying cable, which is installed on the transmission tower through a cable fixer and is electrically connected to the drainage wire. Each phase of the transmission tower is provided with a closing system, a moving contact, and a static contact and is electrically connected to the current-carrying cable. The other end of the current-carrying cable is short-circuited and conducted through a cable terminal to form a de-icing circuit.

[0013] In a preferred embodiment, the ground wire de-icing system includes a ground wire downlead, which is fixed on the iron tower through an insulating clamp. A switch knife switch is arranged on the ground wire downlead. The end of the ground wire downlead is short-circuited with the current-carrying cable through a cable terminal to form a de-icing circuit.

[0014] In a preferred embodiment, the operating principle of the system is as follows: S1. The system receives the ice melting instruction, and the controller remotely controls the low-voltage power supply cabinet to start. The control board in the low-voltage power supply cabinet controls the first electric push rod to start; S2. The first electric push rod controls the first telescopic rod and the insulating push rod to extend outwards, thereby pushing the toothed plate to slide forward; S3. The forward sliding of the toothed plate drives the transmission gear and the third electric push rod to rotate counterclockwise; S4. While rotating counterclockwise, the third electric push rod pushes the second telescopic rod to extend outwards. When the third electric push rod rotates counterclockwise by 90 degrees, the moving contact at the end of the second telescopic rod just abuts against the static contact and is electrically conducted; S5.1. The low-voltage power supply cabinet supplies ice melting current to the moving contact. The ice melting current sequentially passes through the static contact and the current-carrying cable, and is conducted to each phase on the transmission tower through the cable terminal at the short end of the current-carrying cable and forms an ice melting loop. The direct current ice melting of the three-phase terminals of the electric tower is achieved by inputting the ice melting current through the low-voltage power supply cabinet; S5.2. After the remote control switch disconnector is closed, the current-carrying cable of any phase is conducted to the ground wire downlead and forms an ice melting loop. The low-voltage power supply cabinet supplies ice melting current to the moving contact. The ice melting current sequentially passes through the static contact, the current-carrying cable and the ground wire downlead. The direct current ice melting of the ground wire system of the electric tower is achieved by inputting the ice melting current through the low-voltage power supply cabinet; S7. After the cable ice melting is completed, the control board controls the first electric push rod to start again. The first electric push rod controls the first telescopic rod and the insulating push rod to contract inwards, thereby pulling the toothed plate to slide backward; The toothed plate drives the transmission gear and the third electric push rod to rotate clockwise and separates the moving contact from the static contact; S8. During the clockwise rotation of the third electric push rod, the second telescopic rod extends and contracts inwards at the same time. At the same time, the first electric push rod pushes the lock ring to extend outwards. When the third electric push rod rotates clockwise by 90 degrees, the lock catch on the side of the second telescopic rod just latches with the extended lock ring and completes the self-locking folding contraction; S9. The remote control switch disconnector is separated, the low-voltage power supply cabinet is closed, and the ice melting work is completed.

[0015] A tower-mounted large-current streamlined drive DC ice melting automatic short-circuit control system for transmission lines, and its beneficial effects include but are not limited to the following points: 1. The present invention adopts a streamlined structure of electric push rods and gear-rack transmission to realize the full-automatic opening and closing control of the moving contact and the static contact, eliminating the need for manual tower climbing operation and eliminating the risk of high-altitude operation. The remote control technology supports the execution of ultra-remote instructions, combined with real-time status feedback, ensuring the accuracy and timeliness of ice melting operations; 2. The system supports two modes: short - circuiting any two - phase conductors and short - circuiting conductors and ground wires. Through the coordinated control of the ground - wire down - lead subsystem and the remote disconnect switch, the ice - melting circuit can be quickly switched to flexibly meet the different ice - melting requirements of conductors and ground wires, avoiding the functional limitations of traditional single - mode devices; 3. It adopts a sealed protective housing and copper - aluminum composite conductive materials to effectively resist the adverse environmental impacts such as icing and corrosion, ensuring the stable operation of the equipment under extreme conditions from - 40°C to 70°C. The streamlined transmission mechanism reduces mechanical wear points, with the failure rate reduced by more than 60% and the maintenance cycle extended to more than 5 years; 4. The ground - wire down - lead subsystem is controlled by an insulating fixture and a remote disconnect switch, avoiding the problem of the extended live range of the tower caused by long down - leads and ensuring the safety of operation and maintenance personnel and the public. During the current - passing process, the grading ring and insulating support design are adopted to ensure that the insulation performance of the line is not damaged and the risk of phase - to - phase short - circuit is reduced. Brief Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the closing system of the present invention; Figure 2 It is a schematic structural diagram of the moving contact and the static contact of the present invention; Figure 3 It is a schematic structural diagram of the conductor ice - melting system of the present invention; Figure 4 It is a schematic structural diagram of the conductor - ground - wire ice - melting system of the present invention.

[0017] In the figure: low - voltage power supply cabinet 1, control board 2, bottom plate 3, first support angle steel 4, first electric push rod 5, lock ring 6, second electric push rod 7, second support angle steel 8, first telescopic rod 9, insulating push - pull rod 10, third support angle steel 11, toothed plate 12, transmission gear 13, third electric push rod 14, second telescopic rod 15, lock 16, moving contact 17, moving - contact conductive rod 171, spring support plate 172, moving - contact spring 173, moving contact head 174, static contact 18, static contact head 181, protective cover 182, grading ring 183, drainage wire 184, insulating support 185, support rod 186, drainage - wire clamp 187, current - passing cable 19, cable fixer 20, cable terminal 21, insulating fixture 22, ground - wire down - lead 23, switch disconnect switch 24, controller 25, control line 26. Detailed Embodiment

[0018] As Figure 1As shown in the figure, a tower-mounted large-current simplified drive DC de-icing automatic short-circuit control system for transmission lines is an innovative solution designed for the icing problems that are likely to occur in transmission lines under harsh weather conditions. The system includes a switching-on system, a moving contact 17, a static contact 18, a wire de-icing system, and a ground wire de-icing system. Among them, the low-voltage power supply cabinet 1 serves as the core of the power supply for the entire system. It is electrically connected to the switching-on system through wires, providing stable and reliable power support for the switching-on system to ensure its stable operation in different environments. The switching-on system is installed on the transmission tower. It is not only a key link connecting the low-voltage power supply cabinet 1 and the moving contact 17, but also the core component controlling the movement of the moving contact 17. The moving contact 17 is connected to the switching-on system, and a static contact 18 is correspondingly arranged on its side. The static contact 18 is also installed on the transmission tower. When the system is started, the moving contact 17 contacts the static contact 18 under the drive of the switching-on system. At this time, the end of the static contact 18 is electrically connected to the wire de-icing system and the ground wire de-icing system, laying a foundation for subsequent de-icing operations, enabling the system to quickly respond and carry out de-icing work, and ensuring the safe and stable operation of the transmission line.

[0019] The preferred solution is as Figure 1 shown. Inside the low-voltage power supply cabinet 1, there is a PLC control board 2. The PLC control board 2 is an intelligent control unit based on programmable logic controller technology, with high reliability and flexibility. It is electrically connected to an external controller 25 through a control line 26. This connection method enables operators to send various instructions to the PLC control board 2 through the controller 25 at a place far from the site. For example, in case of an emergency or when de-icing parameters need to be adjusted, operators can quickly respond and remotely control key parameters such as the output power and switching-on time of the low-voltage power supply cabinet 1, achieving precise control of the entire DC de-icing automatic short-circuit control system, greatly improving the automation level and operation convenience of the system, and at the same time reducing the safety risks brought by manual operation.

[0020] The preferred solution is shown in Figure 1. The closing system includes a bottom plate 3, which is made of high-strength and corrosion-resistant metal materials and has good stability and load-bearing capacity. It serves as the installation foundation for other components of the closing system and provides a solid support for the entire system. On the bottom plate 3, there are a first support angle steel 4, a second support angle steel 8, and a third support angle steel 11. These support angle steels not only play a role in fixing and supporting other components but also enhance the overall rigidity and stability of the closing system through reasonable layout and structural design. Among them, a first electric push rod 5 is installed below the first support angle steel 4. The first electric push rod 5 can efficiently convert electrical energy into mechanical energy of linear motion. It has precise displacement control ability and high thrust output, and can meet the action requirements of the system under different working conditions. A second electric push rod 7 is installed on the second support angle steel 8. The second electric push rod 7 also has efficient power conversion and precise control ability. It cooperates with the first electric push rod 5 to jointly complete the actions of the closing system. An insulating push-pull rod 10 is installed on the third support angle steel 11. The insulating push-pull rod 10 is made of high-performance insulating materials. It can not only effectively transmit power but also prevent current leakage, ensuring the safety of operators and equipment.

[0021] In the preferred solution shown in Figure 1, the first electric push rod 5 is connected to the push rod connecting lock ring 6. This connection method uses high-strength connecting parts and precise assembly processes to ensure that the first electric push rod 5 can reliably control the action of the lock ring 6. The first electric push rod 5 is vertically connected to the bottom plate 3 and abuts against the first support angle steel 4. The second electric push rod 7 is connected to the insulating push-pull rod 10 through the first telescopic rod 9. The first telescopic rod 9 has good telescopic performance and rigidity and can accurately transmit the power of the second electric push rod 7 to the insulating push-pull rod 10. The other end of the insulating push-pull rod 10 is connected to the toothed plate 12, and the toothed plate 12, the insulating push-pull rod 10, and the first telescopic rod 9 are coaxially arranged. This coaxial arrangement method greatly improves the efficiency and accuracy of power transmission, reduces energy loss and wear between components, and ensures that all components of the closing system can work together to achieve precise action control.

[0022] The preferred solution is shown in Figure 1. A transmission gear 13 is arranged below the toothed plate 12. The transmission gear 13 and the toothed plate 12 adopt a high-precision gear meshing design, which has good transmission efficiency and stability. When the toothed plate 12 moves under the push of the insulating push rod 10, it can accurately drive the transmission gear 13 to rotate. At the axis center of the transmission gear 13, a third electric push rod 14 is installed. The third electric push rod 14 is the direct driving component for the movement of the moving contact 17 and has the ability of quick response and precise control. The third electric push rod 14 is connected to the moving contact 17 through a second telescopic rod 15. The second telescopic rod 15 can accurately drive the moving contact 17 to move according to the action of the third electric push rod 14, realizing the contact and separation between the moving contact 17 and the static contact 18. At the same time, a latch 16 is arranged on the side of the second telescopic rod 15. The latch 16 adopts a reliable locking mechanism. When the moving contact 17 moves to the designated position, the latch 16 can quickly lock the second telescopic rod 15, ensuring the stability and safety of the system during the working process and preventing circuit failures caused by accidental movement of the moving contact 17.

[0023] The preferred solution is shown in Figure 2. The moving contact 17 includes a moving contact conducting rod 171, a spring support plate 172 and a moving contact spring 173. The moving contact conducting rod 171 is made of a metal material with high conductivity and has good electrical conductivity and mechanical strength. One end of it is fixedly connected to the second telescopic rod 15. This fixed connection method adopts an advanced welding or mechanical connection process to ensure that the moving contact conducting rod 171 can move synchronously with the second telescopic rod 15, guaranteeing the reliability of power transmission. The other end of the moving contact conducting rod 171 is vertically connected to the spring support plate 172. The vertical connection method enables the spring support plate 172 to stably support the moving contact spring 173. The spring support plate 172 is elastically connected to the moving contact head 174 through the moving contact spring 173. The moving contact spring 173 has an appropriate elastic coefficient, which can play a buffering role when the moving contact head 174 contacts the static contact 18, reducing the impact force at the moment of contact. At the same time, it can also ensure a good contact pressure between the moving contact head 174 and the static contact 18, ensuring the stability of circuit conduction. The contact conducting rod 171 is electrically connected to the low-voltage power supply cabinet 1 through a power line. The power line adopts high-quality cable materials and has good insulation performance and electrical conductivity, which can stably conduct the current output by the low-voltage power supply cabinet 1 to the moving contact 17.

[0024] The preferred solution is shown in Figure 2. The static contact 18 includes a static contact head 181, a protective cover 182, a grading ring 183, a drainage wire 184, an insulating post 185, a support rod 186, and a drainage wire clamp 187. The grading ring 183 is connected to the insulating post 185 through the support rod 186. The grading ring 183 adopts a special structural design, which can effectively uniform the electric field distribution and reduce the damage to the equipment caused by excessive local electric field intensity. The other end of the insulating post 185 is installed on the transmission tower and corresponds to the position of the moving contact 17. The insulating post 185 is made of a high-performance insulating material, has good insulation performance and mechanical strength, can reliably support the grading ring 183 and the static contact head 181, and at the same time ensure the electrical insulation between the static contact 18 and the transmission tower. The static contact head 181 is arranged on the side of the grading ring 183. The static contact head 181 is made of a material with high conductivity and wear resistance, and can maintain good electrical conductivity and surface quality during frequent contact and separation processes. A protective cover 182 is arranged above the static contact head 181. The protective cover 182 can prevent impurities such as dust, rain, snow, etc. from the outside world from polluting and damaging the static contact head 181, and improves the reliability and service life of the static contact 18. The bottom of the grading ring 183 is connected with a drainage wire clamp 187. The drainage wire clamp 187 adopts a reliable clamping structure and can firmly clamp the drainage wire 184. The drainage wire 184, the drainage wire clamp 187, the grading ring 183, and the static contact head 181 are electrically connected to each other. This conduction structure adopts a good electrical connection process, which can ensure the smooth conduction of current between various components and provide a stable current input for the conductor de-icing system and the ground wire de-icing system.

[0025] The preferred solution is shown in Figure 3. The wire de-icing system includes a current-carrying cable 19, which is made of a cable material with high conductivity and low resistance, and has good current-carrying capacity and heat dissipation performance. It is installed on the transmission tower through a cable fixture 20. The cable fixture 20 adopts a reliable fixing structure and anti-loosening design, which can ensure that the current-carrying cable 19 maintains a stable installation state under different environmental conditions (such as strong wind, ice and snow, etc.). The current-carrying cable 19 is electrically connected to the diversion wire 184. This conductive connection adopts high-quality cable joints and connection processes, which can reduce the contact resistance, reduce power loss, and ensure that the current can be efficiently conducted from the static contact 18 to the current-carrying cable 19. Each phase of the transmission tower is provided with a closing system, a moving contact 17 and a static contact 18 and is electrically connected to the current-carrying cable 19. This multi-phase independent setting method enables the system to perform separate de-icing operations on each phase of the wire, improving the pertinence and efficiency of de-icing. The other end of the current-carrying cable 19 is short-circuited and conducted through a cable terminal 21 to form a de-icing loop. The cable terminal 21 adopts a sealed, waterproof and anti-corrosion design, which can ensure the reliability and stability of the de-icing loop. When current passes through the de-icing loop, the current-carrying cable 19 will generate heat, thereby realizing the de-icing of the wire, effectively preventing faults such as wire breakage and short circuit caused by icing, and ensuring the safe operation of the transmission line.

[0026] The preferred solution is shown in Figure 4. The ground wire de-icing system includes a ground wire downlead 23, which is made of a metal material with good conductivity and mechanical strength, and can withstand large currents and the influence of the external environment. It is fixed on the iron tower through an insulating clamp 22. The insulating clamp 22 adopts a high-performance insulating material and a reliable clamping structure, which can ensure the electrical insulation between the ground wire downlead 23 and the iron tower, preventing current leakage from causing harm to the iron tower and the surrounding environment. A switch knife switch 24 is arranged on the ground wire downlead 23. The switch knife switch 24 has good switching performance and arc extinguishing ability, and can accurately control the on-off of the ground wire downlead 23 circuit. When the ground wire needs to be de-iced, the operator can close the switch knife switch 24 through remote control or on-site operation; after de-icing is completed, the switch knife switch 24 is promptly disconnected to restore the normal operation state of the ground wire. The end of the ground wire downlead 23 is short-circuited with the current-carrying cable 19 through a cable terminal 21 to form a de-icing loop. This connection method enables the current to form a closed loop through the ground wire downlead 23 and the current-carrying cable 19, generating heat to realize the de-icing of the ground wire. In this way, the ground wire de-icing system can effectively solve the problem of ground wire icing and improve the overall safety and reliability of the transmission line.

[0027] Example 1: Working process of the wire de-icing system: S1. When the system receives the ice melting instruction, the controller 25 remotely controls the low-voltage power supply cabinet 1 to start, and the control board 2 in the low-voltage power supply cabinet 1 controls the first electric push rod 5 to start; S2. The first electric push rod 5 controls the first telescopic rod 9 and the insulating push rod 10 to extend outwards, thereby pushing the toothed plate 12 to slide forward; S3. The forward sliding of the toothed plate 12 drives the transmission gear 13 and the third electric push rod 14 to rotate counterclockwise; S4. While rotating counterclockwise, the third electric push rod 14 pushes the second telescopic rod 15 to extend outwards, so that the moving contact 17 abuts against the static contact 18 and is electrically conducted; S5. The low-voltage power supply cabinet 1 supplies an ice melting current to the moving contact 17, and the current sequentially passes through the static contact 18, the current-carrying cable 19 and the cable terminal 21 to form a three-phase ice melting loop; S6. After the ice melting is completed, the control board 2 controls the first electric push rod 5 to contract, driving the toothed plate 12 to slide backward, and the transmission gear 13 rotates clockwise to separate the moving contact 17 from the static contact 18; S7. The third electric push rod 14 contracts and self-locks and folds, and the lock catch 16 is latched with the lock ring 6, and the system resets; S8. The low-voltage power supply cabinet 1 is closed, and the wire ice melting operation is completed.

[0028] Embodiment 2: The working process of the conductor and ground wire ice melting system: S1. When the system receives the ice melting instruction, the controller 25 remotely controls the low-voltage power supply cabinet 1 to start, and the control board 2 in the low-voltage power supply cabinet 1 controls the first electric push rod 5 to start; S2. The first electric push rod 5 controls the first telescopic rod 9 and the insulating push rod 10 to extend outwards, pushing the toothed plate 12 to slide forward; S3. The toothed plate 12 drives the transmission gear 13 and the third electric push rod 14 to rotate counterclockwise, making the moving contact 17 conduct with the static contact 18; S4. Remotely control the switch disconnector 24 to close, and the current-carrying cable 19 and the ground wire downlead 23 form an ice melting loop; S5. The low-voltage power supply cabinet 1 supplies an ice melting current to the moving contact 17, and the current passes through the static contact 18, the current-carrying cable 19 and the ground wire downlead 23 to complete the ice melting of the conductor and ground wire; S6. After the ice melting is completed, the control board 2 controls the first electric push rod 5 to contract, and the moving contact 17 is separated from the static contact 18; S7. The third electric push rod 14 is self-locked and folded, the lock catch 16 is latched with the lock ring 6, and the system is reset. S8. The remote control switch disconnector 24 is opened, the low-voltage power supply cabinet 1 is closed, and the conductor ice melting operation is completed.

[0029] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention; any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A tower-mounted large current carrying simplified transmission DC ice melting automatic short-circuit control system for a power transmission line, comprising a closing system, a moving contact (17), a stationary contact (18), a conductor ice melting system and a ground conductor ice melting system, characterized in that: The low-voltage power supply cabinet (1) is electrically connected to a closing system via a conductor; the closing system is installed on a transmission tower and connected to a moving contact (17); a stationary contact (18) is provided on the side of the moving contact (17) and is installed on the transmission tower; an end of the stationary contact (18) is electrically connected to the wires of the conductor ice-melting system and the ground wire ice-melting system.

2. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for transmission lines according to claim 1 is characterized in that: A PLC control board (2) is arranged inside the low-voltage power supply cabinet (1), and the PLC control board (2) is connected to an external controller (25) via a control line (26) via electrical signals.

3. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for transmission lines according to claim 1 is characterized in that: The closing system comprises a base plate (3), on which a first supporting angle steel (4), a second supporting angle steel (8) and a third supporting angle steel (11) are arranged, a first electric push rod (5) is arranged below the first supporting angle steel (4), a second electric push rod (7) is arranged on the second supporting angle steel (8), and an insulating push-pull rod (10) is arranged on the third supporting angle steel (11).

4. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for transmission lines according to claim 3 is characterized in that: The first electric push rod (5) is connected to the locking ring (6) via the push rod. The first electric push rod (5) is vertically connected to the bottom plate (3) and abuts against the first supporting angle steel (4). The second electric push rod (7) is connected to the insulating push-pull rod (10) via the first telescopic rod (9). The other end of the insulating push-pull rod (10) is connected to the tooth plate (12). The tooth plate (12), the insulating push-pull rod (10) and the first telescopic rod (9) are coaxially arranged.

5. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for transmission lines according to claim 4 is characterized in that: A transmission gear (13) is provided below the toothed plate (12) and meshes with the toothed plate (12); a third electric push rod (14) is provided at the axis of the transmission gear (13); the third electric push rod (14) is connected to the moving contact (17) via a second telescopic rod (15); and a lock buckle (16) is provided on the side of the second telescopic rod (15).

6. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for transmission lines according to claim 1 is characterized in that: The moving contact (17) comprises a moving contact conductive rod (171), a spring support plate (172) and a moving contact spring (173); one end of the moving contact conductive rod (171) is fixedly connected to the second telescopic rod (15), the other end of the moving contact conductive rod (171) is vertically connected to the spring support plate (172), the spring support plate (172) is elastically connected to the moving contact (174) via the moving contact spring (173), and the contact conductive rod (171) is electrically connected to the low-voltage power supply cabinet (1) via a power line.

7. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for transmission lines according to claim 1 is characterized in that: The static contact (18) comprises a static contact (181), a protective cover (182), a voltage-equalizing ring (183), a drain wire (184), an insulating support (185), a support rod (186) and a drain wire clamp (187); the voltage-equalizing ring (183) is connected to the insulating support (185) via the support rod (186); the other end of the insulating support (185) is mounted on the transmission tower and corresponds to the position of the moving contact (17); a static contact (181) is mounted on the side of the voltage-equalizing ring (183); a protective cover (182) is arranged above the static contact (181); a drain wire clamp (187) is connected to the bottom of the voltage-equalizing ring (183); a drain wire (184) is connected to the drain wire clamp (187); and the drain wire (184), the drain wire clamp (187), the voltage-equalizing ring (183) and the static contact (181) are electrically connected to each other.

8. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for power transmission lines according to claim 7 is characterized in that: The conductor ice-melting system comprises a current-carrying cable (19), wherein the current-carrying cable (19) is installed on a transmission tower through a cable fixture (20) and is electrically connected to a drainage line (184), each phase of the transmission tower is provided with a closing system, a moving contact (17) and a stationary contact (18) and is electrically connected to the current-carrying cable (19), and the other ends of the current-carrying cables (19) are short-circuited and connected to each other through a cable terminal (21) to form an ice-melting circuit.

9. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for transmission lines according to claim 7 is characterized in that: The ground wire de-icing system comprises a ground wire down conductor (23), which is fixed to the iron tower via an insulating clamp (22), a switch knife (24) is arranged on the ground wire down conductor (23), and an end of the ground wire down conductor (23) is short-circuited with a current-carrying cable (19) via a cable terminal (21) to form an de-icing circuit.

10. The tower-mounted large current simplified transmission DC ice melting automatic short-circuit control system for transmission lines according to any one of claims 1 to 9, characterized in that: The system works as follows: S1, the system receives an ice-melting instruction, the controller (25) remotely controls the low-voltage power supply cabinet (1) to start, and the control panel (2) in the low-voltage power supply cabinet (1) controls the first electric push rod (5) to start; S2, the first electric push rod (5) controls the first telescopic rod (9) and the insulating push-pull rod (10) to extend outward, thereby pushing the toothed plate (12) to slide forward; S3, the toothed plate (12) slides forward, driving the transmission gear (13) and the third electric push rod (14) to rotate counterclockwise; S4, the third electric push rod (14) pushes the second telescopic rod (15) to extend outward while rotating counterclockwise, and when the third electric push rod (14) rotates counterclockwise by 90 degrees, the moving contact (17) at the end of the second telescopic rod (15) just abuts against the static contact (18) and is electrically conductive; S5.

1. The low-voltage power supply cabinet (1) supplies a melting current to the moving contact (17). The melting current sequentially passes through the stationary contact (18) and the current-carrying cable (19), and is connected to each phase on the transmission tower through the cable terminal (21) at the short end of the current-carrying cable (19) to form a melting circuit. The melting current is input through the low-voltage power supply cabinet (1) to achieve the purpose of DC melting of the three-phase terminals of the tower. S5.2, after the remote control knife switch (24) is closed, the current-carrying cable (19) of any phase is connected to the ground wire down conductor (23) to form an ice-melting circuit, and the low-voltage power supply cabinet (1) supplies an ice-melting current to the moving contact (17), and the ice-melting current sequentially passes through the stationary contact (18), the current-carrying cable (19) and the ground wire down conductor (23), and the low-voltage power supply cabinet (1) inputs the ice-melting current to achieve the purpose of DC ice-melting of the tower ground wire system; S6. After the cable ice melting is completed, the control panel (2) controls the first electric push rod (5) to start again, and the first electric push rod (5) controls the first telescopic rod (9) and the insulating push-pull rod (10) to retract inward, thereby pulling the toothed plate (12) to slide backward; the toothed plate (12) drives the transmission gear (13) and the third electric push rod (14) to rotate clockwise and separate the moving contact (17) from the stationary contact (18); S7, during the clockwise rotation of the third electric push rod (14), the second telescopic rod (15) extends and contracts inwardly, and at the same time, the first electric push rod (5) pushes the lock ring (6) to extend outwardly. When the third electric push rod (14) rotates 90 degrees clockwise, the lock buckle (16) on the side of the second telescopic rod (15) just locks with the extended lock ring (6) and completes the self-locking folding and contraction; S8, the remote control switch (24) is opened, the low voltage power supply cabinet (1) is turned off, and the ice melting work is completed.

Images