35kV overhead line vacuum circuit breaker pole

Abstract

The invention discloses a 35kV overhead line vacuum circuit breaker pole, relates to the technical field of circuit breakers, aims to solve the technical problem that an existing compact pole cannot effectively solve the technical problem that the arc form is out of control, and comprises a pole pouring body and a vacuum arc extinguish chamber in the pole pouring body. The vacuum arc-extinguishing chamber is internally provided with a self-adaptive arc-extinguishing element, and the self-adaptive arc-extinguishing element is composed of an insulating base, a conversion unit and a separation grid group, wherein a diamagnetic element is embedded at the bottom of the separation grid group. The element has two states of folding and unfolding, and when the element is closed, the magnetic repulsive force between the diamagnetic element and the permanent magnet of the moving contact enables the separation grid group to be folded at the periphery of the static contact to form a grounding shielding structure of a uniform electric field; and during opening, the magnetic repulsive force is revoked, the conversion unit drives the separation grid group to be unfolded into an arc extinguishing array, the three-dimensional grid-shaped separation sheets and the transverse extinguishing strips strongly divide the gathered electric arc, and the longitudinal dispersion grooves promote plasma diffusion and cooling. According to the invention, external control is not needed, self-adaptive optimization of the arc form is realized, and the on-off reliability and the insulation performance are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breaker, more particularly, to a 35kV overhead line vacuum circuit breaker pole column. BACKGROUND

[0002] The vacuum circuit breaker has become the mainstream switch device in 35kV distribution network, especially in outdoor overhead line, due to its strong arc extinguishing ability, long service life, maintenance-free, environmental protection and other advantages. The core component of the vacuum circuit breaker is the vacuum arc extinguishing chamber, which creates and maintains an ultra-high vacuum environment and uses the rapid diffusion of metal vapor plasma at current zero to achieve arc extinguishing.

[0003] Currently, to adapt to the development trend of miniaturization, compactness and primary and secondary integration of distribution network equipment, the 35kV outdoor pole-mounted vacuum circuit breaker generally adopts a highly integrated packaging design. This design integrates the vacuum arc extinguishing chamber, the main insulating shell, the main conducting circuit and even the built-in sensor into a single modular unit, which has the advantages of compact structure, convenient installation, reliable insulation and the like. The volume of the vacuum arc extinguishing chamber of the mainstream compact pole column in the market has been greatly compressed compared with the traditional cabinet-mounted arc extinguishing chamber.

[0004] However, the volume compression of the arc extinguishing chamber caused by the integration of the pole column not only improves the installation convenience, but also amplifies the inherent contradictions of the existing technology and introduces new technical challenges. The compact design reduces the heat capacity and heat dissipation surface area of the arc extinguishing chamber. When breaking the same rated short-circuit current, the arc energy is released in a smaller space, resulting in higher internal temperature rise and greater metal vapor density. This not only aggravates the contact ablation, but also makes the dielectric recovery speed slower after current zero due to high temperature environment and residual vapor, increasing the burden of breaking.

[0005] Outdoor overhead line switches need to frequently switch load current and withstand unpredictable short-circuit current impact. Standard longitudinal magnetic field contacts can improve the large current breaking capacity, but the magnetic field strength is positively related to the current. When breaking small current or asymmetric short-circuit current containing a large DC component, the self-generated longitudinal magnetic field is weak and unstable, resulting in insufficient arc rotation or even stagnation, which easily changes from the ideal diffusion current form to the harmful contraction current form, causing local contact ablation and affecting the electrical life. The existing structure lacks an active optimization mechanism for arc form under small current and non-ideal current. In view of this, we propose a 35kV overhead line vacuum circuit breaker pole column. SUMMARY

[0006] The purpose of the present application is to provide a 35kV overhead line vacuum circuit breaker pole column to solve the technical problem that the existing compact pole column cannot effectively control the arc form.

[0007] To solve the above technical problems, the present invention provides the following technical solution: a 35kV overhead line vacuum circuit breaker pole, including a pole casting body, a vacuum interrupter chamber is provided inside the pole casting body, a current transformer is provided on one side inside the pole casting body, and a voltage transformer is provided on the other side inside the pole casting body. The vacuum interrupter chamber is equipped with an adaptive interruption element, which includes an insulating base, a conversion unit, and a partition grid assembly. The insulating base is located at the top of the interior of the vacuum interrupter chamber, the conversion unit is located at the bottom of the insulating base, and the partition grid assembly is fixedly connected to the moving end of the conversion unit in a ring with equal spacing. An antimagnetic element is embedded at the bottom of the partition grid assembly. The adaptive arc-extinguishing element has two states: retracted and extended. When in the retracted state, the moving contact and the stationary contact are closed. The magnetic repulsion between the antimagnetic element and the permanent magnet on the moving contact keeps the partition grid group in a retracted position close to the periphery of the stationary contact conductor. At this time, the partition grid group constitutes a grounded shield structure for uniform electric field in the area. When the moving contact separates from the stationary contact, the permanent magnet moves away, causing the magnetic repulsion to be removed. The conversion unit drives the partition grid to expand to the periphery of the contact gap, forming an arc-extinguishing array for dividing the clustered electric arc.

[0008] Preferably, the pole casting body is further provided with spring contact fingers, busbar connecting sleeve, insulating pull rod and permanent magnet mechanism. A plurality of the spring contact fingers are provided on the moving contact, the busbar connecting sleeve is provided at the center of the pole casting body, the permanent magnet mechanism is provided at the bottom end of the pole casting body, the output end of the permanent magnet mechanism is connected to the insulating pull rod, and the end of the insulating pull rod away from the permanent magnet mechanism is connected to the moving contact.

[0009] Preferably, the inlet end, outlet end, grounding end of the pole casting body, and the interior of the pole casting body are all provided with climbing umbrella groups.

[0010] Preferably, the insulating base has a through groove, and the stationary contact is located inside the through groove.

[0011] Preferably, the bottom end of the insulating base is provided with a rotating groove in an annular shape at equal intervals, and the conversion unit is disposed on the rotating groove.

[0012] Preferably, the conversion unit includes a fixed connector, a movable connector, a folding rod A, a folding rod B, and a connecting rod. The fixed connector is fixedly disposed at the bottom end of the insulating base. The movable connector is rotatably sleeved on the fixed connector. The folding rod A is rotatably connected to one end of the movable connector, and the folding rod B is rotatably connected to the other end of the movable connector. One end of the connecting rod is rotatably connected to the end of the folding rod A away from the movable connector, and the other end of the connecting rod is rotatably connected to the end of the folding rod B away from the movable connector. The partition grid is fixedly connected to the connecting rod.

[0013] Preferably, the moving connecting body has a rotating hole, and the moving connecting body is rotatably sleeved on the fixed connecting body through the rotating hole. The outer wall of the moving connecting body is provided with a ring of equally spaced plates, and the folding rod A and the folding rod B are both rotatably connected to the plates.

[0014] Preferably, the partition grid assembly includes a partition body and partition plates, the top end of the partition body is fixedly connected to the moving end of the conversion unit, and the partition plates are fixedly disposed in a linear shape with equal spacing inside the partition body.

[0015] Preferably, the separator is arc-shaped, and a separation cavity is formed on the separator. A plurality of separation pieces are fixedly disposed in the separation cavity. A connecting plate is provided at the top of the separator, and the separator is fixedly connected to the moving end of the conversion unit through the connecting plate. A longitudinal dispersion groove A is also formed on the separator.

[0016] Preferably, several of the partition plates are fixedly connected by connecting columns, and several slots are provided on the partition plates. The partition plates are also provided with longitudinal dispersion grooves B, and transverse strips are fixedly inserted into the slots.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention integrates an adaptive arc-extinguishing element into the vacuum arc-extinguishing chamber of a compact pole, and intelligently links it with the opening and closing operations driven by a permanent magnet mechanism, forming a completely passive and adaptive arc-extinguishing enhancement system. This design requires no external control power supply or complex sensors; it utilizes only the mechanical movement and magnetic field changes of the circuit breaker itself to achieve two optimal strategies within a compact space: non-intervention for small-current diffusion arcs and active, forceful intervention for large-current concentration arcs. This fundamentally solves the core contradiction of traditional fixed-structure arc-extinguishing chambers, which, after volume compression, struggle to balance arc morphology optimization and reliable interruption under different current conditions, significantly improving the interruption capability and overall reliability of outdoor pole-mounted circuit breakers for complex fault currents.

[0018] 2. This invention's adaptive arc-extinguishing element possesses two distinct and practically valuable functional modes: a retracted state and an extended state, achieving functional reuse and optimization of the structure. In the retracted state, the metal separator grid acts as a grounding shield, actively optimizing the electric field at the root of the stationary contact and enhancing insulation strength. In the extended state, the same component rapidly transforms into a highly efficient three-dimensional arc-extinguishing array, powerfully dividing the arc. This intelligent switching, serving two purposes, not only maximizes the utilization of the valuable space inside the arc-extinguishing chamber but also enables the element to play a crucial role in the entire operating cycle of the circuit breaker, including closing and opening operations, greatly enhancing the overall performance and value of the equipment.

[0019] 3. This invention designs a three-dimensional grid arc-extinguishing grid composed of separators, separator plates, and transverse extinguishing strips, and innovatively introduces longitudinal diffusion grooves A and B. This structure achieves multi-dimensional disintegration of the arc from line to surface to volume by subdividing the arc longitudinally and laterally, greatly increasing the arc cooling surface area and path tortuosity. Simultaneously, the crisscrossing channels form an optimized network of metal vapor and plasma diffusion channels, synergistically enhancing heat dissipation, deionization, and dielectric recovery processes. This sophisticated composite structure design is the fundamental guarantee for ensuring that the adaptive arc-extinguishing element achieves rapid and complete arc extinguishing under extreme short-circuit conditions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a frontal cross-sectional view of the present invention. Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a schematic diagram of the vacuum interrupter and adaptive interrupter element structure of the present invention; Figure 5 This is a schematic diagram of the bottom structure of the vacuum interrupter and adaptive interrupter element of the present invention; Figure 6 This is a schematic diagram of the insulating base, conversion unit, and partition grid group structure of the present invention; Figure 7 This is a cross-sectional view of the insulating base, a schematic diagram of the conversion unit and the partition grid group structure of the present invention; Figure 8 This is a schematic diagram of the conversion unit, separator, and separator sheet structure of the present invention; Figure 9 This is a schematic diagram of the conversion unit structure of the present invention; Figure 10 This is a cross-sectional view of the separator, a schematic diagram of the separator cavity and the separator sheet structure of the present invention; Figure 11 This is a schematic diagram of the connecting column, slot, and longitudinal scattering groove B structure of the present invention; Figure 12 A schematic diagram of the retracted state of the adaptive arc-extinguishing element of the present invention.

[0021] Explanation of the labels in the diagram: 1. Pole column casting body; 2. Vacuum interrupter; 3. Current transformer; 4. Voltage transformer; 5. Adaptive arc extinguishing element; 6. Spring contact finger; 7. Busbar connecting sleeve; 8. Insulating tie rod; 9. Permanent magnet mechanism; 10. Climbing umbrella group; 501. Insulating base; 502. Conversion unit; 503. Separating grid assembly; 5011, through groove; 5012, tilting groove; 5021. Fixed connecting rod; 5022. Moving connecting rod; 5023. Folding rod A; 5024. Folding rod B; 5025. Intersecting connecting rod; 5026. Rotary hole; 5027. Plate surface; 5031, Separator; 5032, Separator plate; 5033, Separator cavity; 5034, Connecting plate; 5035, Longitudinal dispersion groove A; 5036, Connecting column; 5037, Slot; 5038, Longitudinal dispersion groove B; 5039, Transverse dispersion bar. Detailed Implementation

[0022] like Figures 1 to 12 As shown, the present invention relates to a 35kV overhead line vacuum circuit breaker pole, including a pole casting body 1, a vacuum interrupter 2 provided inside the pole casting body 1, a current transformer 3 provided on one side inside the pole casting body 1, and a voltage transformer 4 provided on the other side inside the pole casting body 1. The vacuum interrupter 2 is equipped with an adaptive interruption element 5. The adaptive interruption element 5 includes an insulating base 501, a conversion unit 502 and a partition grid group 503. The insulating base 501 is located at the top of the vacuum interrupter 2. The conversion unit 502 is located at the bottom of the insulating base 501. The partition grid group 503 is fixedly connected to the moving end of the conversion unit 502 in a ring with equal spacing. The bottom of the partition grid group 503 is embedded with an antimagnetic element. The adaptive arc-extinguishing element 5 has two states: retracted and extended. When in the retracted state, the moving contact and the stationary contact are closed. The magnetic repulsion between the antimagnetic element and the permanent magnet on the moving contact keeps the partition grid group 503 in the retracted position close to the periphery of the stationary contact conductor. At this time, the partition grid group 503 constitutes a grounded shield structure for uniform electric field in the area. When the moving contact separates from the stationary contact, the permanent magnet moves away, causing the magnetic repulsion to be canceled. The conversion unit 502 drives the partition grid group 503 to expand to the periphery of the contact gap, forming an arc-extinguishing array for dividing the accumulated arc.

[0023] In this invention, when the circuit breaker is closed, a stable magnetic repulsion force is generated between the permanent magnet on the moving contact and the antimagnetic element embedded at the bottom of the separator group 503. This force is transmitted through the conversion unit 502, ensuring that the separator group 503, arranged in a ring with equal spacing, is precisely maintained in a first converged position adjacent to the outer periphery of the stationary contact conductor. At this position, the metallic separator group 503 acts as a grounded shielding structure, effectively optimizing the electric field distribution at the root of the stationary contact and suppressing partial discharge. This improves the insulation reliability of the pole under long-term operating voltage, which is the first beneficial effect of this invention.

[0024] When the moving contact separates from the stationary contact to initiate the circuit breaker tripping, the permanent magnet moves away from the antimagnetic element, and the magnetic repulsion is quickly dispelled. The switching unit 502 then drives the partition grid 503 to deploy synchronously, rapidly forming an arc-extinguishing array around the gap created by the separation of the moving and stationary contacts. This array actively divides the potentially concentrated, contracting arc into multiple parallel short arcs, significantly increasing the arc's cooling surface area and path length. This forces the arc voltage to rise, energy to dissipate rapidly, and guides the arc morphology from a concentrated state to a more easily extinguished diffused state. This significantly improves the breaking capacity and reliability for high-current short-circuit faults, especially asymmetric short-circuit currents. This is the second core beneficial effect of the invention. Throughout the process, the triggering and operation of the mechanism are passively driven by the circuit breaker's own closing, opening, and physical field changes, requiring no additional control power supply or complex sensors. This achieves adaptive and highly reliable optimization of the arc morphology within a compact vacuum arc-extinguishing chamber.

[0025] In an embodiment of the present invention, the pole column casting body 1 is further provided with spring contact fingers 6, busbar connecting sleeve 7, insulating pull rod 8 and permanent magnet mechanism 9. A plurality of spring contact fingers 6 are provided on the moving contact, the busbar connecting sleeve 7 is provided at the center position inside the pole column casting body 1, the permanent magnet mechanism 9 is provided at the bottom end of the pole column casting body 1, the output end of the permanent magnet mechanism 9 is connected to the insulating pull rod 8, and the end of the insulating pull rod 8 away from the permanent magnet mechanism 9 is connected to the moving contact.

[0026] In this embodiment of the invention, the permanent magnet mechanism 9 provides the power for opening and closing the circuit breaker. Its output drives the insulating pull rod 8 to move linearly, thereby causing the moving contact to separate from and make contact with the stationary contact. Several spring fingers 6 on the moving contact ensure low resistance, elastic and tight contact of the high current path between the moving contact and the busbar connecting sleeve 7, ensuring the current carrying capacity and long-term operational stability of the main conductive circuit. The busbar connecting sleeve 7, located at the center of the pole casting 1, serves as the main conductive connection hub, introducing external line current into the moving contact through the spring fingers 6, thus forming a power and conductivity integrated module with excellent mechanical and electrical performance.

[0027] In an embodiment of the present invention, the inlet end, outlet end, grounding end, and cavity of the pole casting body 1 are all provided with climbing umbrella groups 10.

[0028] The creepage protection umbrella group 10 in this invention effectively suppresses surface flashover that may occur in harsh outdoor environments such as humidity and pollution by significantly increasing the surface creepage distance of the high-voltage conductor to ground and between phases. Especially at the 35kV voltage level, the optimized design of the creepage protection umbrella group 10 can cope with harsh conditions such as high altitude, salt spray, and industrial pollution, ensuring the strength of external insulation. At the same time, the creepage protection umbrella group 10 inside the cavity also forms an additional creepage protection barrier for internal components, such as the current transformer 3, voltage transformer 4, and the insulating base 501 of the adaptive arc extinguishing element 5, improving the margin of internal insulation coordination and the environmental resistance of the overall equipment. It is a key insulation enhancement design to ensure the long-term maintenance-free operation of outdoor pole-mounted circuit breakers.

[0029] In another embodiment of the present invention, an insulating base 501 is provided with a through groove 5011, and a stationary contact is located in the through groove 5011.

[0030] In this embodiment, a through groove 5011 is formed on the insulating base 501, within which the stationary contact is precisely positioned. This structure firstly achieves axial alignment and circumferential limiting between the stationary contact and the insulating base 501, ensuring the coaxiality of the stationary and moving contacts when they are closed, thus providing a foundation for obtaining a stable conductive circuit with low contact resistance. Secondly, the sidewall of the through groove 5011 forms an annular insulating barrier for the conductor at the root of the stationary contact, which can uniformly distribute the surface electric field and suppress electric field concentration at that location, thereby improving the insulation strength inside the vacuum interrupter 2 when closed.

[0031] In another embodiment of the present invention, the bottom end of the insulating base 501 is provided with a rotating groove 5012 at equal intervals in an annular shape, and the conversion unit 502 is disposed on the rotating groove 5012.

[0032] In this embodiment, rotating slots 5012 are formed at equal intervals in a ring at the bottom end of the insulating base 501, and the conversion unit 502 is installed there. The rotating slots 5012 provide a precise radial positioning and circumferentially evenly distributed mounting base for the conversion unit 502, ensuring that multiple conversion units 502 can move synchronously and consistently around the axis of the stationary contact. The slot structure itself enhances the mechanical strength and heat dissipation capacity of a local area of ​​the insulating base 501, while limiting the initial movement trajectory of the conversion unit 502, so that it can achieve a smooth and stable rotation from the retracted to the unfolded state when driving the partition grid group 503, avoiding motion interference and jamming.

[0033] In an embodiment of the present invention, the conversion unit 502 includes a fixed connecting body 5021, a movable connecting body 5022, a folding rod A 5023, a folding rod B 5024, and a connecting rod 5025. The fixed connecting body 5021 is fixedly disposed at the bottom end of the insulating base 501. The movable connecting body 5022 is rotatably sleeved on the fixed connecting body 5021. The folding rod A 5023 is rotatably connected to one end of the movable connecting body 5022, and the folding rod B 5024 is rotatably connected to the other end of the movable connecting body 5022. One end of the connecting rod 5025 is rotatably connected to the end of the folding rod A 5023 away from the movable connecting body 5022, and the other end of the connecting rod 5025 is rotatably connected to the end of the folding rod B 5024 away from the movable connecting body 5022. The partition grid group 503 is fixedly connected to the connecting rod 5025.

[0034] In this embodiment, the conversion unit 502 constitutes a precise planar linkage mechanism. The fixed link 5021 is fixed to the insulating base 501 to provide a support reference. When the moving link 5022 rotates around the fixed link 5021 under the action of a driving force, the rotational motion of the moving link 5022 is converted into the composite planar motion of the connecting link 5025 through the linkage of two sets of symmetrically arranged folding rods A5023, folding rod B5024 and connecting rod 5025. This mechanism has a clear motion dead point and amplification characteristics, and can efficiently and reliably convert a small input angular displacement or driving force into the large-range, translational unfolding and retracting action required by the partition grid group 503. Its symmetrical linkage design ensures the balance of force distribution, avoids single-point stress concentration, makes the synchronization of the partition grid group 503 better, and the action smoother, thereby improving the speed and shape consistency of the arc extinguishing array formation. It is the core power transmission and motion conversion hub of the adaptive arc extinguishing element 5.

[0035] In an embodiment of the present invention, a rotating hole 5026 is provided on the moving connecting body 5022, and the moving connecting body 5022 is rotatably sleeved on the fixed connecting body 5021 through the rotating hole 5026. The outer wall of the moving connecting body 5022 is provided with a plate surface 5027 in an annular shape with equal spacing. The bending rod A 5023 and the bending rod B 5024 are both rotatably connected to the plate surface 5027.

[0036] In this embodiment, the moving link 5022 forms a rotating pair with the fixed link 5021 through the rotating hole 5026, realizing the basis for the rotational motion of the core inside the conversion unit 502. The precise fit of the rotating hole 5026 ensures the coaxiality and low friction of the rotational motion of the moving link 5022, providing a stable and reliable rotation center for the entire linkage mechanism. The plate surface 5027, which is arranged in annular intervals on the outer wall of the moving link 5022, provides high-strength, equidistantly distributed mounting points for the folding rods A5023 and B5024. This design ensures that when the moving parts 5022 of multiple conversion units 502 rotate synchronously, they can drive all the folding rods 5024 through their respective plates 5027 to achieve completely consistent angle and torque output. This ensures the absolute synchronicity and force balance of the retraction and unfolding actions of the multiple ring-arranged partition grids 503, effectively preventing mechanism jamming, wear, or uneven arc segmentation that may be caused by asynchronous actions. It is a key structural detail for improving the overall performance and reliability of the adaptive arc extinguishing array.

[0037] In another embodiment of the present invention, the partition grid group 503 includes a partition body 5031 and a partition piece 5032. The top end of the partition body 5031 is fixedly connected to the moving end of the conversion unit 502, and the partition piece 5032 is fixedly disposed in a linear shape with equal spacing inside the partition body 5031.

[0038] In this embodiment, the partition grid 503 is specifically defined as consisting of a partition body 5031 and partition plates 5032 fixed at equal intervals within it. The partition body 5031 serves as a supporting frame, with its top end fixedly connected to the moving end of the conversion unit 502 via a connecting rod 5025, accurately converting the mechanical motion transmitted by the conversion unit 502 into its own position and attitude changes. The array of partition plates 5032 fixed inside it constitutes the core functional unit of the arc extinguishing array. When the partition grid 503 is deployed, these parallel and equidistant partition plates 5032 can cut into and divide the large, concentrated arc column like comb teeth, cutting it into a series of short arcs connected in series, thereby drastically increasing the arc voltage and heat dissipation surface area, accelerating the dissipation of arc energy and the deionization of plasma.

[0039] In another embodiment of the present invention, the separator 5031 is arc-shaped, and a separator cavity 5033 is provided on the separator 5031. A plurality of separator pieces 5032 are fixedly disposed in the separator cavity 5033. A connecting plate 5034 is provided at the top of the separator 5031. The separator 5031 is fixedly connected to the moving end of the conversion unit 502 through the connecting plate 5034. A longitudinal dispersion groove A5035 is also provided on the separator 5031.

[0040] This embodiment further optimizes the configuration of the separator 5031 into an arc shape, allowing it to tightly surround the stationary contact in the retracted state and form an arc-shaped arc-extinguishing barrier coaxial with the contact gap in the unfolded state. The partition cavity 5033 provides precise positioning and protective installation space for the separator plate 5032, ensuring the stability and accuracy of its array. The connecting plate 5034 at the top serves as a dedicated interface, realizing a robust and easy-to-assemble mechanical connection between the separator 5031 and the moving end connecting rod 5025 of the conversion unit 502. In particular, the longitudinal diffusion groove A5035 formed on the separator 5031 has multiple beneficial effects: First, as a diffusion channel for metal vapor and plasma, it facilitates the longitudinal flow and transport of metal vapor and high-temperature plasma products generated by the arc to the condensation surface, preventing their local accumulation in the separator cavity 5033, thereby accelerating the recovery of the medium after the arc is extinguished; second, its orientation helps guide the distribution of the arc root when the arc is divided, avoiding local overheating; third, the groove structure itself can effectively block creepage paths that may develop along the surface of the separator 5031, improving insulation reliability. This design achieves integrated optimization of arc extinguishing, heat dissipation, insulation, and mechanical connection.

[0041] In an embodiment of the present invention, a plurality of partition plates 5032 are fixedly connected by a connecting post 5036. A plurality of slots 5037 are provided on the partition plates 5032. A longitudinal scattering groove B5038 is also provided on the partition plates 5032. A transverse strip 5039 is fixedly inserted into the slot 5037.

[0042] In this embodiment, the separator 5032 has been structurally strengthened and its function upgraded. The connecting column 5036 connects and fixes several separators 5032 in series to form a grid group with extremely strong integrity, which greatly improves its mechanical rigidity and resistance to electric arc electrodynamic impact, ensuring that the structure does not deform or fall apart when dividing strong electric arcs.

[0043] The slot 5037 on the separator 5032 provides a precise lateral installation position for the transverse extinguishing bar 5039. After insertion, the transverse extinguishing bar 5039, together with the separator 5032, forms a three-dimensional, interwoven grid arc-extinguishing grid. This structure further subdivides and disturbs the longitudinally segmented arc flow laterally, significantly increasing the contact area and path tortuosity between the arc and the cold metal, resulting in faster and more thorough arc energy dissipation. Simultaneously, the longitudinal diffusion groove B5038 on the separator 5032 and the longitudinal diffusion groove A5035 on the separator 5031 work synergistically to form a channel network promoting the longitudinal diffusion, cooling, and condensation of metal vapor and plasma. This network, along with the transverse extinguishing bar 5039, creates cross-flow, optimizing the fluid and thermal field distribution within the arc-extinguishing chamber. This three-dimensional grid design achieves a enhanced arc-extinguishing effect, moving from one-dimensional segmentation to two-dimensional and even three-dimensional disintegration of concentrated arcs, significantly improving breaking performance.

[0044] Working principle: This embodiment provides a method for using the pole of a 35kV overhead line vacuum circuit breaker, including the following steps: Step 1: Preparation and closing status; The pole casting 1 is installed at a predetermined position on the outdoor overhead line tower, and its inlet and outlet ends are connected to the line respectively. When the permanent magnet mechanism 9 receives the closing command, its output end drives the insulating pull rod 8 to move upward linearly, and the insulating pull rod 8 drives the moving contact to move towards the stationary contact. The moving contact finally makes close contact with the stationary contact located in the through groove 5011 of the insulating base 501, completing the closing. During this process, several spring contact fingers 6 on the moving contact maintain elastic and tight electrical contact with the busbar connecting sleeve 7, establishing the main conductive circuit. At the same time, the permanent magnet installed on the moving contact and the antimagnetic element embedded at the bottom of the partition grid group 503 generate magnetic repulsion. This force is transmitted through the conversion unit 502, forcing all partition grid groups 503 arranged in a ring at equal intervals to precisely close and maintain in a closed position close to the periphery of the stationary contact conductor, forming a grounded shield structure and uniformly distributing the electric field at that location.

[0045] Step 2: Triggering and Mechanism Preset; When the line needs to be tripped, the permanent magnet mechanism 9 receives the tripping command, and its output drives the insulating rod 8 to move downward in a straight line. The insulating rod 8 causes the moving contact to begin separating from the stationary contact. This separation action causes the permanent magnet on the moving contact to move and gradually move away from the antimagnetic element at the bottom of the separator 503. The magnetic repulsion between the two weakens rapidly until it is removed. The removal of the magnetic repulsion releases the constraint on the moving link 5022 in the switching unit 502.

[0046] Step 3: Deploy the arc extinguishing array; After the magnetic repulsion is removed, the conversion unit 502 is released. In each conversion unit 502, the moving link 5022 begins to rotate around the fixed link 5021 fixed on the insulating base 501. The moving link 5022 drives the bent rods A5023 and B5024 connected at both ends to move through its outer wall plate 5027, thereby driving the connecting rod 5025 to complete a specific planar composite motion. All conversion units 502 arranged around the stationary contact operate synchronously, driving the partition grid group 503 fixed to them to unfold outward and downward from the retracted state through their respective connecting rods 5025.

[0047] Step 4: Arc breaking and extinguishing; After each separator grid group 503 is deployed, the array of separator plates 5032 fixed by the connecting posts 5036 and the transverse extinguishing bars 5039 inserted in the slots 5037 of the separator plates 5032 together form a three-dimensional grid-like arc-extinguishing array around the gap where the moving and stationary contacts have separated. At this time, if there is a fault current in the line, an arc will be generated between the contacts. This three-dimensional grid arc-extinguishing array quickly cuts into and divides the large, concentrated arc column, breaking it down into a large number of short arcs connected in series. The longitudinal diffusion grooves A5035 and B5038 on the separator body 5031 and separator plates 5032 form diffusion channels, promoting the longitudinal transport and cooling of metal vapor and plasma. After the arc is divided, the voltage increases, the contact area with the cold metal increases sharply, the energy is rapidly dissipated, the arc morphology is forced to change from a concentrated state to a diffused state, and it is quickly extinguished when the current crosses zero.

[0048] Step 5: Reset the status; After the arc is extinguished, the line is disconnected. When it is necessary to close the circuit again, step one is repeated. The permanent magnet mechanism 9 drives the moving contact to move upward. The permanent magnet on the moving contact approaches the antimagnetic element again, the magnetic repulsion is rebuilt, and the linkage mechanism of the switching unit 502 drives all the partition grid groups 503 to overcome the unfolding driving force and accurately reset to the retracted shielding position adjacent to the stationary contact, preparing for the next arc extinguishing.

[0049] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A pole of a 35kV overhead line vacuum circuit breaker, characterized in that, It includes a pole casting body (1), a vacuum interrupter (2) is provided inside the pole casting body (1), a current transformer (3) is provided on one side inside the pole casting body (1), and a voltage transformer (4) is provided on the other side inside the pole casting body (1). The vacuum interrupter (2) is provided with an adaptive arc-extinguishing element (5). The adaptive arc-extinguishing element (5) includes an insulating base (501), a conversion unit (502), and a partition grid group (503). The insulating base (501) is located at the top inside the vacuum interrupter (2). The conversion unit (502) is located at the bottom of the insulating base (501). The partition grid group (503) is fixedly connected to the moving end of the conversion unit (502) in a ring with equal spacing. The bottom of the partition grid group (503) is embedded with an antimagnetic element. The adaptive arc-extinguishing element (5) has two states: retracted and extended. When in the retracted state, the moving contact and the stationary contact are closed. The magnetic repulsion between the antimagnetic element and the permanent magnet on the moving contact keeps the partition grid group (503) in the retracted position close to the periphery of the stationary contact conductor. At this time, the partition grid group (503) constitutes a grounded shield structure for uniform electric field in the area. When the moving contact separates from the stationary contact, the permanent magnet moves away, causing the magnetic repulsion to be removed. The conversion unit (502) drives the partition grid (503) to expand to the periphery of the contact gap, forming an arc-extinguishing array for dividing the clustered electric arc.

2. The pole of a 35kV overhead line vacuum circuit breaker according to claim 1, characterized in that, The pole casting body (1) is also provided with spring contact fingers (6), busbar connecting sleeve (7), insulating pull rod (8) and permanent magnet mechanism (9). Several of the spring contact fingers (6) are provided on the moving contact. The busbar connecting sleeve (7) is located at the center of the pole casting body (1). The permanent magnet mechanism (9) is located at the bottom of the pole casting body (1). The output end of the permanent magnet mechanism (9) is connected to the insulating pull rod (8). The end of the insulating pull rod (8) away from the permanent magnet mechanism (9) is connected to the moving contact.

3. The pole of a 35kV overhead line vacuum circuit breaker according to claim 1, characterized in that, The inlet, outlet, and grounding ends of the pole casting body (1) and the interior of the pole casting body (1) are all provided with climbing umbrella groups (10).

4. The pole of a 35kV overhead line vacuum circuit breaker according to claim 1, characterized in that, The insulating base (501) has a through groove (5011) and the stationary contact is located in the through groove (5011).

5. The pole of a 35kV overhead line vacuum circuit breaker according to claim 1, characterized in that, The insulating base (501) has a rotating groove (5012) at an evenly spaced ring at its bottom end, and the conversion unit (502) is located on the rotating groove (5012).

6. The pole of a 35kV overhead line vacuum circuit breaker according to claim 1, characterized in that, The conversion unit (502) includes a fixed connector (5021), a movable connector (5022), a folding rod A (5023), a folding rod B (5024), and a connecting rod (5025). The fixed connector (5021) is fixedly mounted on the bottom end of the insulating base (501). The movable connector (5022) is rotatably mounted on the fixed connector (5021). The folding rod A (5023) is rotatably connected to one end of the movable connector (5022). The folding rod B (5024) is rotatably connected to the other end of the moving link (5022), one end of the connecting rod (5025) is rotatably connected to the end of the folding rod A (5023) away from the moving link (5022), the other end of the connecting rod (5025) is rotatably connected to the end of the folding rod B (5024) away from the moving link (5022), and the partition grid group (503) is fixedly connected to the connecting rod (5025).

7. A 35kV overhead line vacuum circuit breaker pole according to claim 6, characterized in that, The movable connecting body (5022) has a rotating hole (5026) and is rotatably sleeved on the fixed connecting body (5021) through the rotating hole (5026). The outer wall of the movable connecting body (5022) is provided with a plate surface (5027) in an annular shape with equal spacing. The folding rod A (5023) and the folding rod B (5024) are both rotatably connected to the plate surface (5027).

8. A 35kV overhead line vacuum circuit breaker pole according to claim 1, characterized in that, The partition grid group (503) includes a partition body (5031) and a partition plate (5032). The top end of the partition body (5031) is fixedly connected to the moving end of the conversion unit (502), and the partition plate (5032) is fixedly arranged in a linear shape with equal spacing inside the partition body (5031).

9. A 35kV overhead line vacuum circuit breaker pole according to claim 8, characterized in that, The separator (5031) is arc-shaped, and a separator cavity (5033) is provided on the separator (5031). A plurality of separator pieces (5032) are fixedly disposed in the separator cavity (5033). A connecting plate (5034) is provided at the top of the separator (5031). The separator (5031) is fixedly connected to the moving end of the conversion unit (502) through the connecting plate (5034). A longitudinal dispersion groove A (5035) is also provided on the separator (5031).

10. A 35kV overhead line vacuum circuit breaker pole according to claim 9, characterized in that, Several of the partition plates (5032) are fixedly connected by connecting posts (5036). Several slots (5037) are provided on the partition plates (5032). The partition plates (5032) are also provided with longitudinal dispersion grooves B (5038). A transverse strip (5039) is fixedly inserted into the slots (5037).

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