Horizontal telescopic double-knife parallel ice-melting disconnector and DC ice-melting system

Abstract

The present application relates to the field of energy power technology, and particularly relates to a horizontal telescopic double-blade parallel ice-melting disconnector and direct current ice-melting system; comprising: a mounting base, a driving assembly and a conductive mechanism; the mounting base adopts a three-column support structure, which is composed of one static column and two symmetrically arranged dynamic columns; the conductive mechanism comprises two groups of parallelly arranged blade switch units, each group of blade switch units comprises a blade and a static contact, the blade moves in the horizontal direction under the action of the driving assembly to realize the engagement or separation with the static contact, and the two groups of blades form a parallel conductive loop in the closed state. Through the double-blade parallel shunt design, the structure size and weight of a single group of blades are effectively controlled, the problems of poor mechanical balance and excessive operating force of the existing single-blade large-current ice-melting switch caused by the excessive structure weight are solved, and the reliable on-off demand of 8000A and above large-current ice-melting under the 550kV voltage level can be met.

Description

Technical Field

[0001] This invention relates to the field of energy and power technology, specifically to a horizontal telescopic double-knife parallel de-icing isolating switch and a DC de-icing system. Background Technology

[0002] In high-voltage power transmission and transformation systems, icing of transmission lines is one of the serious natural disasters threatening the safe operation of the power grid. Ice-melting switches, as the core control equipment for ice-melting operations, are used to connect or disconnect the ice-melting current, ensuring timely and safe ice-melting work when lines are icy, and are of great significance for maintaining the stability of power transmission.

[0003] Currently, the highest rated current of 550kV vertical telescopic de-icing switches on the market is 6300A. With the continuous increase in grid capacity and the frequent occurrence of extreme weather, the demand for de-icing switches with higher current ratings is becoming increasingly urgent. However, when the rated current increases to 8000A, the structural size and weight of the conductive parts inevitably increase significantly, bringing many technical challenges to switch design. The substantial increase in the size and weight of the conductive structure makes it difficult to maintain the mechanical balance of the switch, resulting in abnormally increased operating force, and in severe cases, even failure to close the circuit, directly affecting the reliable operation of de-icing. If the traditional single-knife switch design is continued, the switch body alone needs to bear an 8000A current. Its excessively large structural size and weight not only exacerbate the balance problem, but its own mechanical strength and current-carrying capacity also cannot meet the operating requirements of the 8000A level, limiting further improvements in switch performance.

[0004] Therefore, there is an urgent need for a new type of 550kV de-icing disconnect switch and DC de-icing system that can adapt to high current requirements of 8000A and above. Summary of the Invention

[0005] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a horizontal telescopic double-knife parallel de-icing isolating switch and a DC de-icing system to solve the problems of excessively large conductive structure size, excessive weight and poor mechanical balance in the prior art.

[0006] (II) Technical Solution To achieve the above objectives, a horizontally telescopic double-knife parallel de-icing disconnect switch of the present invention includes: a mounting base, a driving assembly, and a conductive mechanism; wherein... The mounting base includes a stationary column and two movable side columns. The two movable side columns are symmetrically arranged on both sides of the stationary column, and the three together form a three-column support structure. Each of the moving side columns and the stationary column is fixedly provided with a mounting plate at its top. The mounting plate of the moving side column and the mounting plate of the stationary column are rigidly connected by a connecting plate to form an integral mounting base. The mounting base is provided with a first insulating support assembly and two second insulating support assemblies. The first insulating support assembly is fixed to the mounting plate of the stationary column, and the second insulating support assemblies are correspondingly fixed to the mounting plate of the moving column. The conductive mechanism includes two sets of knife switch units arranged in parallel. Each set of knife switch units includes a knife switch and a stationary contact that cooperates with the knife switch. The two knife switches are respectively mounted on the second insulating support assembly, and the stationary contacts are all mounted on the first insulating support assembly. The position of the stationary contact corresponds to the closed position of the corresponding knife switch after it is extended horizontally. The knife switch moves horizontally under the drive of the drive assembly to extend horizontally to engage with the stationary contact, or to retract horizontally to separate from the stationary contact. The two sets of knife switch units form a parallel conductive circuit in the closed state. The drive assembly includes an operating mechanism and a transmission connector. The transmission connector is connected to the switch blade and is used to transmit the power output by the operating mechanism to the switch blade to drive the switch blade to complete the horizontal extension and retraction movement.

[0007] Preferably, each of the second insulation support assemblies includes two moving-side support insulators, which are spaced apart on the mounting plate of the moving-side column along the setting and movement direction of the switch, and together support the switch unit.

[0008] Preferably, the first insulation support assembly includes two stationary side support insulators, which are spaced apart on the mounting plate of the stationary column along the setting and movement direction of the switch to jointly support the stationary contact.

[0009] Preferably, the rated current of each group of the knife switch units is 5000A, and the total rated carrying current of the two groups connected in parallel is 8000A.

[0010] Preferably, the rated voltage of the knife switch unit is 550kV.

[0011] Preferably, the transmission connection includes a rotating insulator and a transmission shaft; the rotating insulator is rotatably mounted on the mounting plate, one end of the transmission shaft is fixedly connected to the rotating insulator, and the other end is connected to the output end of the operating mechanism.

[0012] Preferably, the operating mechanism includes a drive motor and a controller. The drive motor is fixedly mounted on the mounting base, and the output shaft of the drive motor is connected to the transmission connector. The controller is electrically connected to each of the drive motors and is used to control two drive motors to operate synchronously or control a single drive motor to operate independently according to the received operation command.

[0013] Preferably, the moving-side support insulator and the stationary-side support insulator include at least two insulator units, each of which is stacked sequentially in a vertical direction, and the ends of adjacent insulator units are fixedly connected by a flange.

[0014] Preferably, the insulator unit is a porcelain insulator or a composite insulator, and its outer surface has awnings distributed at intervals along the axial direction.

[0015] To achieve the above objectives, the present invention also provides a DC de-icing system, including a DC de-icing power supply and a horizontal telescopic double-knife parallel high-current de-icing isolating switch as described above. The horizontal telescopic double-knife parallel high-current de-icing isolating switch is connected in series between the DC de-icing power supply and the transmission line to be de-iced, and is used to control the on / off of the de-icing current.

[0016] (III) Beneficial Effects In the horizontal telescopic double-knife parallel high-current de-icing isolating switch and DC de-icing system of the present invention, the total current is diverted to two parallel knife switches by adopting a conductive mechanism design with double knife switches in parallel. The actual current carried by each knife switch is only half of the total current, thereby allowing each knife switch to adopt a smaller structural size and lighter weight. This avoids the problems of difficulty in maintaining mechanical balance and abnormally increased operating force caused by simply enlarging the size of a single knife switch, thus achieving a balance between high current carrying capacity and good mechanical performance. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the horizontal telescopic double-knife parallel high-current de-icing isolating switch of the present invention; Figure 2 for Figure 1 A front view schematic diagram of a horizontal telescopic double-knife parallel high-current de-icing disconnector in China; Figure 3 for Figure 1 A schematic diagram of the left side of the horizontal telescopic double-knife parallel high-current de-icing isolating switch in the middle; Figure 4 for Figure 1 A top view of the horizontal telescopic double-knife parallel high-current de-icing isolating switch in the diagram.

[0018] [Explanation of Labels in the Attached Image] 1: Mounting base; 11: Moving side column; 12: Static column; 13: Mounting plate; 14: Connecting plate; 2: First insulation support assembly; 21: Static side support insulator; 3: Second insulation support assembly; 31: Moving side support insulator; 4: Knife switch unit; 5: Stationary contact; 6: Operating mechanism; 7: Transmission connecting component; 71: Transmission shaft; 72: Rotary insulator. Detailed Implementation

[0019] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] See Figures 1 to 4 The present invention provides a horizontal telescopic double-knife parallel de-icing isolating switch comprising: Mounting base 1, drive assembly, and conductive mechanism; wherein... The mounting base 1 includes a stationary column 12 and two moving side columns 11. The two moving side columns 11 are symmetrically arranged on both sides of the stationary column 12, and the three together form a three-column support structure. Each of the moving side columns 11 and the stationary column 12 is fixedly provided with a mounting plate 13 at its top end. The mounting plate 13 of the moving side column 11 and the mounting plate 13 of the stationary column 12 are rigidly connected by a connecting plate 14 to form an integral mounting base 1. The mounting base 1 is provided with a first insulating support assembly 2 and two second insulating support assemblies 3. The first insulating support assembly 2 is fixed to the mounting plate 13 of the stationary column 12, and the second insulating support assembly 3 is correspondingly fixed to the mounting plate 13 of the moving side column 11. The conductive mechanism includes two sets of parallel knife switch units 4. Each set of knife switch units 4 includes a knife switch and a stationary contact 5 corresponding to the knife switch. The two knife switches are respectively mounted on the second insulating support assembly 3, and the stationary contacts 5 are all mounted on the first insulating support assembly 2. The position of the stationary contact 5 corresponds to the closed position of the corresponding knife switch after it extends horizontally. The knife switch moves horizontally under the drive of the drive assembly to extend horizontally to engage with the stationary contact 5, or to retract horizontally to separate from the stationary contact 5. The two sets of knife switch units 4 form a parallel conductive circuit in the closed state. The drive assembly includes an operating mechanism 6 and a transmission connector 7. The transmission connector 7 is connected to the knife gate and is used to transmit the power output by the operating mechanism 6 to the knife gate to drive the knife gate to complete the horizontal extension and retraction movement.

[0024] Specifically, each set of the knife switch unit 4 has a rated current of 5000A, and the total rated current carrying capacity of the two sets connected in parallel is 8000A. The rated voltage of the knife switch unit 4 is 550kV.

[0025] By electrically connecting two sets of knife switch units 4 in parallel, the total de-icing current is diverted to two independent on / off branches. When the total current is 8000A, the actual current carried by a single set of knife switch units 4 is approximately 4000A to 5000A. Compared to the scheme where a single knife switch directly carries the entire 8000A current, the required conductive cross-sectional area of ​​each knife switch is significantly reduced, thereby effectively controlling the structural size and weight of the knife switch itself. The reduced weight of the knife switch directly reduces the inertial force and friction that need to be overcome during operation, and the rated output torque of the operating mechanism 6 is correspondingly reduced, which helps to extend the service life of the operating mechanism 6 and reduce the overall energy consumption of the equipment.

[0026] In the three-column support structure, the moving column 11 and the stationary column 12 are rigidly connected by a connecting plate 14, which significantly improves the overall bending stiffness of the mounting base 1 in the horizontal direction. When the switch moves horizontally, especially when it moves to the cantilever state at its maximum extension position, the mounting base 1 can effectively resist the overturning moment caused by the switch's own weight and inertia, ensuring the relative positional accuracy between the stationary contact 5 and the moving contact of the switch, thereby improving the contact reliability during closing and the long-term operational stability. The horizontal telescopic movement makes the switch's movement direction perpendicular to the direction of gravity. The operating force is mainly used to overcome the frictional resistance of the transmission system and the clamping force when the contact is inserted, without needing to do extra work to increase the weight of the switch itself. Therefore, it is particularly suitable for applications of large-size, high-current switch switches. At the same time, the horizontal movement facilitates the installation of guide rails or support rollers under the switch, further ensuring the straightness and repeatability of the movement trajectory.

[0027] The synchronous drive mode ensures the synchronized switching of the two parallel branches during ice-melting operations, avoiding current imbalance caused by unilateral current flow. The independent drive mode provides technical feasibility for asymmetrical operation, segmented maintenance, and fault isolation of the equipment. For example, when abnormal wear occurs in the contacts of one set of knife switch units 4, requiring maintenance, the independent drive mode can be used to disconnect and isolate that set of knife switches, while the other set of knife switches remains closed to maintain the ice-melting circuit continuity, thus completing the maintenance work without interrupting the ice-melting operation.

[0028] Preferably, each of the second insulating support assemblies 3 includes two moving-side support insulators 31, which are spaced apart on the mounting plate 13 of the moving-side column 11 along the setting and movement direction of the switch, and together support the switch unit 4.

[0029] Compared to single-insulator support, double-insulator support significantly improves the stability of the switch installation, effectively preventing lateral deflection or swaying during horizontal extension and retraction. Especially in the cantilevered state with the switch extended to its maximum stroke, the double-point support structure distributes the switch's weight and moving load to the mounting base 1, reducing the root bending moment caused by single-point stress. This ensures consistent alignment accuracy and contact pressure between the moving and stationary contacts 5 during closing. The horizontal spacing between the two insulators can be optimized based on the switch length and weight to achieve optimal support stiffness and vibration resistance.

[0030] Preferably, the first insulating support assembly 2 includes two stationary side support insulators 21, which are spaced apart on the mounting plate 13 of the stationary column 12 along the setting and movement direction of the switch, so as to jointly support the stationary contact 5.

[0031] Compared to single-insulator support, double-insulator support for the stationary contact 5 effectively improves the overall rigidity and deformation resistance of the stationary contact 5 mounting structure. During the closing process, the moving contact at the front end of the switch blade inserts into the stationary contact 5, generating a certain impact force. Under long-term current-carrying conditions, the stationary contact 5 also needs to withstand the electrodynamic force generated by the current flow. The double-point support structure can evenly distribute the impact load and electrodynamic load to the two insulators and the mounting base 1 below, avoiding displacement or tilting of the stationary contact 5 due to concentrated force at a single point, thereby ensuring long-term stable contact pressure between the moving and stationary contacts 5 and improving the reliability of the conductive connection. The spacing between the two stationary side support insulators 21 can be reasonably arranged according to the size and stress conditions of the stationary contact 5 to ensure that the support structure has sufficient rigidity in both horizontal and vertical directions.

[0032] Preferably, the transmission connector 7 includes a rotating insulator 72 and a transmission shaft 71; the rotating insulator 72 is rotatably mounted on the mounting plate 13, one end of the transmission shaft 71 is fixedly connected to the rotating insulator 72, and the other end is connected to the output end of the operating mechanism 6.

[0033] The rotating insulator 72 is rotatably mounted on the mounting plate 13. Its body is made of insulating material, enabling it to transmit rotational torque while electrically isolating the low-potential side of the operating mechanism 6 from the high-potential side of the switch, ensuring operator safety and equipment insulation. One end of the drive shaft 71 is fixedly connected to the rotating insulator 72, and the other end is connected to the output end of the operating mechanism 6. When the operating mechanism 6 outputs rotational torque, the drive shaft 71 rotates accordingly, causing the rotating insulator 72 to rotate synchronously. The rotating insulator 72 then transmits the torque to the switch's transmission mechanism, ultimately driving the switch to complete its horizontal extension and retraction movement.

[0034] Preferably, the operating mechanism 6 includes a drive motor and a controller. The drive motor is fixedly mounted on the mounting base 1, and the output shaft of the drive motor is connected to the transmission connector 7. The controller is electrically connected to each of the drive motors and is used to control two drive motors to operate synchronously or control a single drive motor to operate independently according to the received operation command.

[0035] When the controller receives a synchronous closing or synchronous opening command, it simultaneously outputs the same control signal to both drive motors, causing them to operate synchronously and thus driving both sets of switches to complete the closing or opening action simultaneously. When the controller receives an independent operation command, it only sends a control signal to the specified drive motor, causing that motor to operate independently, and the corresponding set of switches to perform the action, while the other motor remains stationary.

[0036] Preferably, the moving-side support insulator 31 and the stationary-side support insulator 21 each comprise at least two insulator units, which are stacked sequentially in a vertical direction, and the ends of adjacent insulator units are fixedly connected by flanges. Each insulator unit is a porcelain insulator or a composite insulator, and its outer surface has axially spaced sheds.

[0037] Since this disconnector is used at a voltage level of 550kV, the requirements for air insulation distance and creepage distance of the insulation support components are relatively high. If a single integral insulator is used, not only is the manufacturing process complex and the yield rate low, but it is also prone to damage due to excessive length during transportation and on-site hoisting. In this embodiment, both the moving-side support insulator 31 and the stationary-side support insulator 21 adopt a structure in which at least two insulator units are stacked sequentially in the vertical direction, and the ends of adjacent insulator units are fixedly connected by flanges. This segmented assembly structure effectively reduces the manufacturing difficulty and transportation length limitations of single insulator units, facilitating standardized factory production and rapid on-site assembly. At the same time, the flange connection is waterproofed with sealant or sealing rings to prevent rainwater from seeping into the connection gaps and causing internal metal parts to rust or the insulation performance to deteriorate.

[0038] Insulator units can be selected from porcelain insulators or composite insulators depending on the operating environment. Porcelain insulators are characterized by high mechanical strength and good weather resistance, and are suitable for areas with low pollution levels; composite insulators are characterized by light weight, strong hydrophobicity, and excellent resistance to flashover, and are suitable for heavily polluted or coastal areas with high humidity and salt spray.

[0039] Each insulator unit has axially spaced sheds on its outer surface. The purpose of these sheds is to increase the creepage distance on the insulator surface, i.e., the discharge path length along the insulator surface from the high-voltage end to the grounding end. This effectively improves the insulator's withstand voltage capability in harsh environments such as dampness and pollution, and reduces the risk of surface flashover. The spacing between adjacent sheds and the shed extension length are optimized according to the system's rated voltage and pollution level to ensure that bridging discharge does not occur between sheds in rainy or foggy weather.

[0040] To achieve the above objectives, the present invention also provides a DC de-icing system, including a DC de-icing power supply and a horizontal telescopic double-knife parallel de-icing isolating switch as described above. The horizontal telescopic double-knife parallel high-current de-icing isolating switch is connected in series between the DC de-icing power supply and the transmission line to be de-iced, and is used to control the on / off of the de-icing current.

[0041] When transmission lines become icy and require de-icing, the DC de-icing power supply starts and outputs a large current, which is transmitted to the transmission line to be de-iced through the isolating switch. The Joule heating effect generated when the current passes through the conductor melts and removes the ice from the line surface. Before the de-icing operation begins, the de-icing circuit is connected by closing the isolating switch; after the de-icing operation is completed, the de-icing circuit is disconnected by opening the isolating switch, restoring the transmission line to normal operation.

[0042] Thanks to the aforementioned horizontal telescopic double-knife parallel de-icing disconnector, this DC de-icing system can reliably deliver de-icing currents of 8000A and above at a voltage level of 550kV, meeting the de-icing requirements of lines with higher voltage levels and larger transmission capacities. Simultaneously, the parallel structure design of the disconnector ensures good mechanical stability even when carrying large currents, and the synchronous / independent dual-mode drive design provides significant flexibility for system operation and maintenance. Therefore, the overall reliability and adaptability of the DC de-icing system are improved, providing strong support for the safe and stable operation of the power grid.

[0043] It should be understood that the above description of specific embodiments of the present invention is only for illustrating the technical approach and features of the present invention, and is intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the specific embodiments described above. All changes or modifications made within the scope of the claims of the present invention should be covered within the protection scope of the present invention.

Claims

1. A horizontally telescopic double-knife parallel de-icing disconnect switch, comprising a mounting base, a drive assembly, and a conductive mechanism; wherein, The mounting base includes a stationary column and two movable side columns. The two movable side columns are symmetrically arranged on both sides of the stationary column, and the three together form a three-column support structure. Each of the moving side columns and the stationary column is fixedly provided with a mounting plate at its top. The mounting plate of the moving side column and the mounting plate of the stationary column are rigidly connected by a connecting plate to form an integral mounting base. The mounting base is provided with a first insulating support assembly and two second insulating support assemblies. The first insulating support assembly is fixed to the mounting plate of the stationary column, and the second insulating support assemblies are correspondingly fixed to the mounting plate of the moving column; characterized in that... The conductive mechanism includes two sets of knife switch units arranged in parallel. Each set of knife switch units includes a knife switch and a stationary contact that cooperates with the knife switch. The two knife switches are respectively mounted on the second insulating support assembly, and the stationary contacts are all mounted on the first insulating support assembly. The position of the stationary contact corresponds to the closed position of the corresponding knife switch after it is extended horizontally. The knife switch moves horizontally under the drive of the drive assembly to extend horizontally to engage with the stationary contact, or to retract horizontally to separate from the stationary contact. The two sets of knife switch units form a parallel conductive circuit in the closed state. The drive assembly includes an operating mechanism and a transmission connector. The transmission connector is connected to the switch blade and is used to transmit the power output by the operating mechanism to the switch blade to drive the switch blade to complete the horizontal extension and retraction movement.

2. The horizontal telescopic double-knife parallel high-current de-icing isolating switch according to claim 1, characterized in that, Each of the second insulation support assemblies includes two moving-side support insulators, which are spaced apart on the mounting plate of the moving-side column along the setting and movement direction of the switch, and together support the switch unit.

3. The horizontal telescopic double-knife parallel high-current de-icing isolating switch according to claim 1, characterized in that, The first insulation support assembly includes two stationary side support insulators, which are spaced apart on the mounting plate of the stationary column along the setting and movement direction of the switch to jointly support the stationary contact.

4. The horizontal telescopic double-knife parallel high-current de-icing isolating switch according to claim 1, characterized in that, The rated current of each set of knife switch units is 5000A, and the total rated current carrying capacity of the two sets connected in parallel is 8000A.

5. The horizontal telescopic double-knife parallel high-current de-icing isolating switch according to claim 1, characterized in that, The rated voltage of the knife switch unit is 550kV.

6. The horizontal telescopic double-knife parallel high-current de-icing isolating switch according to claim 1, characterized in that, The transmission connection includes a rotating insulator and a transmission shaft; the rotating insulator is rotatably mounted on the mounting plate, one end of the transmission shaft is fixedly connected to the rotating insulator, and the other end is connected to the output end of the operating mechanism.

7. The horizontal telescopic double-knife parallel high-current de-icing isolating switch according to claim 1, characterized in that, The operating mechanism includes a drive motor and a controller. The drive motor is fixedly mounted on the mounting base, and the output shaft of the drive motor is connected to the transmission connector. The controller is electrically connected to each of the drive motors and is used to control two drive motors to operate synchronously or control a single drive motor to operate independently according to the received operation command.

8. The horizontal telescopic double-knife parallel high-current de-icing isolating switch according to claim 2 or 3, characterized in that, The moving-side support insulator and the stationary-side support insulator each comprise at least two insulator units, which are stacked sequentially in a vertical direction, and the ends of adjacent insulator units are fixedly connected by flanges.

9. The horizontal telescopic double-knife parallel high-current de-icing isolating switch according to claim 8, characterized in that, The insulator unit is a porcelain insulator or a composite insulator, and its outer surface has awnings that are spaced apart along the axial direction.

10. A DC ice-melting system, characterized in that, Includes a DC de-icing power supply and a horizontal telescopic double-knife parallel high-current de-icing isolating switch as described in any one of claims 1 to 9; The horizontal telescopic double-knife parallel high-current de-icing isolating switch is connected in series between the DC de-icing power supply and the transmission line to be de-iced, and is used to control the on / off of the de-icing current.

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