An integrated pole-mounted switch housing with dual break and dual voltage sensing

Abstract

The application discloses an integrated double-break and double-end voltage sensing integrated pole-mounted switch shell, and belongs to the technical field of pole-mounted circuit breakers. The shell is provided with a vacuum break chamber and an isolation chamber which are parallel along the vertical direction. A vacuum arc-extinguishing chamber is arranged in the vacuum break chamber, and an isolating switch assembly is arranged in the isolation chamber. An isolation observation window is arranged on the shell at a position corresponding to the isolation chamber. The isolation observation window comprises an upper observation window and a lower observation window which are nested with each other and can slide relative to each other. The opening and closing states of the isolating switch can be judged by observing whether the color-marked isolation worm can be seen through the observation window. Voltage sensors are arranged on the incoming line side and the outgoing line side of the shell, each of which is composed of a high-voltage capacitor and a voltage equalizing net, so that independent collection of double-end voltage signals of the incoming line and the outgoing line is realized. The vacuum break and the sliding isolation break are integrated in one body, the state of the isolation break can be directly and visually judged through the adjustable observation window, and the application has the advantages of compact structure, direct and visual state judgment and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of high-voltage switchgear for power system power supply and distribution, and specifically relates to the housing structure of a pole-mounted switch, especially an integrated epoxy resin housing that integrates a vacuum break and a sliding isolation break, and integrates dual voltage sensors for the incoming and outgoing ends. Background Technology

[0002] With the deepening of intelligent transformation of power distribution networks, integrated primary and secondary pole-mounted circuit breakers have become the mainstream product for outdoor pole-mounted switches. Among the existing pole-mounted circuit breakers, the breaking capacity is insufficient and they are prone to generating greenhouse gases; while the disconnecting switches of externally isolated circuit breakers are exposed to the air for a long time, and the disconnectors are prone to oxidation, leading to problems such as increased contact resistance and overheating.

[0003] To address the aforementioned issues, a technical solution has emerged that integrates disconnect switches and circuit breakers within the same housing. However, existing technologies still have the following shortcomings: 1. The space utilization rate of the integrated isolation break method is low. Existing circuit breakers with built-in isolating switches mostly use rotary isolating switches for disconnection. These switches require significant internal space, resulting in a large and bulky overall circuit breaker that is inconvenient for pole mounting and operation. While some solutions utilize direct-acting isolating switches, the arrangement of the isolating and vacuum contacts is still not compact enough. The isolating contact typically occupies a separate chamber, leading to an excessively large overall height or width of the pole.

[0004] 2. There are deficiencies in the methods for observing the condition of isolated fracture surfaces. Existing circuit breakers with built-in isolating switches are mostly completely sealed, making it impossible to accurately observe whether the isolating switch ports are closed before power is supplied, and impossible to confirm whether the isolating switch is open during power outage maintenance, which easily leads to the risk of misoperation. Although some solutions have been developed to achieve visual monitoring by installing monitoring through-holes and transparent glass on the outer wall of the switchgear room, these observation windows are mostly simple fixed transparent window structures, which have the following problems: The observation window is usually fixed and cannot be flexibly assembled after the epoxy shell is molded. The sealing structure is simple, but its sealing performance deteriorates after long-term outdoor use, making it easy for moisture and dust to enter the isolated space. The observation window is usually fixed with bolts or glue, which can easily loosen under long-term vibration.

[0005] 3. The voltage sensor layout is unreasonable. Currently, in commercially available deeply integrated pole-mounted switches, the high-voltage signal at the input end must be led out through a conductor spanning the vacuum interrupter. This not only increases insulation risks but also prevents the high-voltage signals from being acquired at the same horizontal level. Furthermore, existing solutions lack adequate voltage equalization measures for the voltage sensors, making them prone to discharge under the power frequency withstand voltage at the break point. Although some solutions integrate the voltage sensor into the solid-sealed pole, the layout of the voltage sensors at the input and output ends is still limited by the structure of the conductive circuit, making it difficult to achieve symmetrical arrangement and effective voltage equalization. Summary of the Invention

[0006] In view of this, the present invention provides an integrated pole-mounted switch housing that integrates dual-break and dual-terminal voltage sensing, aiming to solve the problems of low isolation break space utilization, unreliable status observation methods, and limited insulation performance caused by voltage sensor layout in existing circuit breakers with built-in isolation breaks in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: An integrated pole-mounted switch housing that integrates dual-break and dual-terminal voltage sensing includes a housing, a vacuum interrupter, a disconnecting switch assembly, an isolation observation window, an incoming line voltage sensor, and an outgoing line voltage sensor.

[0008] The housing comprises a vacuum break chamber and an isolation chamber arranged side-by-side in a vertical direction. The vacuum interrupter chamber is located within the vacuum break chamber, and the disconnector assembly is located within the isolation chamber. The parallel arrangement of the vacuum break chamber and the isolation chamber in a vertical direction integrates the vacuum break and the isolation break within the same housing without interference. Compared to existing designs where the disconnector is externally mounted or horizontally arranged, this design maximizes the reduction of the overall housing volume, resulting in a more compact structure.

[0009] Furthermore, a moving end contact and a stationary end contact of the vacuum interrupter are installed inside the vacuum interrupter chamber. The top of the stationary end contact of the vacuum interrupter chamber is fixedly connected to the connecting busbar. The bottom of the moving end contact of the vacuum interrupter chamber is fixedly connected to the insulating pull rod via an insulating pull rod connecting rod, and the insulating pull rod is connected to the insulating pull rod adjusting rod. A vacuum end sliding contact is sleeved on the insulating pull rod connecting rod, and a spring contact finger is sleeved on the vacuum end sliding contact, with the spring contact finger abutting against the sleeve of the incoming contact. When the drive mechanism pulls or pushes the insulating pull rod adjusting rod, the insulating pull rod adjusting rod sequentially drives the insulating pull rod, the insulating pull rod connecting rod, the vacuum end sliding contact, the spring contact finger, and the moving end contact of the vacuum interrupter chamber to move up and down, thereby realizing the opening and closing of the vacuum break.

[0010] Furthermore, the disconnector assembly includes an isolating moving contact, an isolating stationary contact, a grounding contact, and an isolating worm gear. The top of the isolating stationary contact is fixedly connected to the other end of the connecting busbar. The isolating moving contact has a cylindrical structure with an internal thread matching the isolating worm gear, and an axially extending guide groove is formed on the outside of the isolating moving contact. An outgoing limit pin is provided at the outgoing contact, which abuts against the guide groove. The outgoing limit pin is used to restrict the circumferential rotation of the isolating moving contact and guide it to slide vertically. When the isolating worm gear is driven to rotate by a motor, it drives the isolating moving contact to move linearly in the vertical direction: when the isolating moving contact rises to the top, its upper and lower ends are electrically connected to the isolating stationary contact and the outgoing contact, respectively, to achieve closing; when the isolating moving contact descends to the bottom, its upper and lower ends are electrically connected to the outgoing contact and the grounding contact, respectively, to achieve opening and grounding. The isolating moving contact is driven by a sliding method with worm gear and worm shaft, which significantly reduces the space requirement of the isolating break on the housing compared to the structure of the rotary isolating switch in the existing technology. At the same time, the worm gear and worm shaft drive has a self-locking characteristic, which can ensure that the isolating switch is stably maintained in the open or closed position and will not be accidentally disengaged due to vibration or external force.

[0011] The isolation observation window is located on the housing at a position corresponding to the isolation chamber, and is used to observe the opening and closing status of the disconnecting switch assembly. The isolation observation window includes an upper observation window, a lower observation window, an upper end face sealing ring, a lower end face sealing ring, a middle sealing ring, and a retaining ring. Both the upper and lower observation windows are cylindrical transparent structures, nested together and capable of relative sliding. The upper observation window has an upper observation window thread on its top inner side, and the lower observation window has a lower observation window thread on its bottom inner wall. The housing has threads that mate with the upper and lower observation windows. The upper observation window is threaded to the housing via the upper observation window thread, and the lower observation window is threaded to the housing via the lower observation window thread. The upper end face sealing ring is located between the upper observation window and the housing, the lower end face sealing ring is located between the lower observation window and the housing, and the middle sealing ring is located between the nested sliding mating surfaces of the upper and lower observation windows. Three sealing rings are used to prevent moisture and dust from entering the isolation chamber through different paths, ensuring the sealing performance of the shell. A retaining ring groove is provided on the outer wall of the lower observation window, and the retaining ring is engaged in the retaining ring groove to limit the relative sliding displacement between the upper and lower observation windows, preventing loosening of the threaded fit due to operational vibration. The isolation observation window is a post-installed structure, meaning it is installed after the shell is cast, avoiding the problem of unadjustable observation window position deviations in traditional one-piece casting schemes, and also facilitating later maintenance and replacement.

[0012] When the disconnector assembly is in the open grounding state, the moving contact slides downward, and the operator can directly observe the isolation worm gear through the upper and lower observation windows; when the disconnector assembly is in the closed state, the moving contact slides upward to the position where it connects with the stationary contact and the outgoing contact, and the isolation worm gear is obscured and cannot be seen.

[0013] Preferably, the surface of the isolating worm gear is provided with a color marking layer. The open / closed status of the isolating switch can be determined by whether the color marking layer is visible through the observation window. This method is intuitive and clear, and can be quickly determined without the need for electronic equipment, effectively avoiding the risk of misoperation.

[0014] The input voltage sensor is located on the input side of the housing, and the output voltage sensor is located on the output side of the housing. The input and output voltage sensors are respectively located on opposite sides of the isolation chamber. Both the input and output voltage sensors are capacitive voltage divider type sensors, each including a high-voltage capacitor and a voltage equalization grid. The housing has an input high-voltage capacitor compartment at the input contact, containing the high-voltage capacitor of the input voltage sensor and the input capacitor voltage equalization grid, which is electrically connected to the input contact. Similarly, the housing has an output high-voltage capacitor compartment at the output contact, containing the high-voltage capacitor of the output voltage sensor and the output capacitor voltage equalization grid, which is electrically connected to the output contact. The incoming and outgoing voltage sensors are horizontally arranged opposite each other inside the housing, located on both sides of the isolation chamber. This layout avoids the drawback of existing technologies that require a conductor to cross the vacuum interrupter chamber from the incoming side to the outgoing side, eliminating the electric field distortion and discharge risk caused by the bridging conductor. Each voltage sensor is equipped with an independent ring-shaped voltage equalization grid, which effectively evens out the electric field distribution at the high-voltage end, reduces the local electric field intensity, and prevents insulation breakdown or partial discharge. The incoming and outgoing voltage acquisition points are arranged on both sides of the isolation break, which is beneficial to the insulation coordination of the break's power frequency withstand voltage.

[0015] Furthermore, a current sensor is also provided inside the housing, which surrounds the outer periphery of the incoming line contact and is used to collect the load-side current signal.

[0016] Furthermore, a flexible connector is wrapped under the moving end contact of the vacuum interrupter. The flexible connector is made of pure copper and is made of multiple layers of copper sheets. This not only ensures the conduction of current, but also provides a flexible connection between the vacuum interrupter and the disconnector assembly.

[0017] Furthermore, the outer surface of the housing is provided with a silicone rubber layer, and a silicone buffer layer is provided between the vacuum interrupter chamber and the vacuum break chamber of the housing, which has excellent heat resistance, mechanical strength, high and low temperature impact resistance, crack resistance and electrical insulation properties.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) Innovative isolation observation window structure, achieving intuitive visibility of status and reliable sealing. The isolation observation window of this invention adopts a double-cylinder structure in which the upper and lower observation windows are nested and can slide relative to each other. It is connected to the shell by threads and uses three sealing rings to achieve multiple sealing protection. Compared with the fixed observation window or simple transparent cover solution in the prior art, the observation window of this invention can adaptively adjust the extension length according to the sliding stroke of the isolation moving contact, always ensuring that the observation window is directly facing the isolation break position. The retaining ring design effectively prevents the threads from loosening due to operating vibration, ensuring the reliability of long-term outdoor use. The method of judging the status of the isolation switch by whether the isolation worm gear with color markings is visible through the observation window is intuitive and reliable, and can be quickly judged without the aid of electronic equipment.

[0019] (2) Optimized layout of dual-end voltage sensors significantly improves the insulation performance of the break. In this invention, the voltage sensors on the incoming and outgoing sides are respectively set on both sides of the isolation chamber and arranged opposite each other in the horizontal direction. This avoids the drawback of the prior art, which requires a conductor to be run across the vacuum interrupter from the incoming side to the outgoing side to bring the high-voltage signal to the outgoing side, and eliminates the electric field distortion and discharge risk caused by the bridging conductor. Each voltage sensor is equipped with an independent ring equalizing grid, which effectively uniformizes the electric field distribution at the high-voltage end. The incoming and outgoing voltage acquisition points are arranged on both sides of the isolation break, which is beneficial to the insulation coordination of the power frequency withstand voltage of the break.

[0020] (3) The observation window is designed to be installed after the shell is cast, which greatly improves the production assembly efficiency and maintenance convenience. The isolation observation window of the present invention adopts a post-installation structure, that is, the observation window is installed after the shell is cast. This allows the installation depth and angle of the observation window to be flexibly adjusted according to the actual installation position after the shell is formed, avoiding the problem of the observation window being misaligned due to casting deviation, and also facilitating later maintenance and replacement.

[0021] (4) Double-break integrated full insulation eliminates the influence of outdoor environmental factors. Both the vacuum break and the isolation break are integrated into the housing. The vacuum interrupter and the disconnecting switch assembly are completely wrapped inside the epoxy resin housing, with no exposed live parts, achieving full insulation. This avoids problems such as jamming, rust, and dirt caused by prolonged outdoor rain, ultraviolet radiation, and air corrosion, and effectively prevents faults such as increased circuit resistance, contact point overheating, and switch failure.

[0022] (5) The vacuum interrupter and the isolation interrupter are arranged vertically side by side, resulting in a compact structure and small volume. The vacuum interrupter and the disconnector assembly are arranged vertically side by side inside the housing. The isolation interrupter is driven by a sliding method with worm gear and worm wheel. Compared with the existing technology of external or rotating disconnector layout, this maximizes the compression of the overall volume of the housing and saves installation space.

[0023] (6) The isolating moving contact adopts a worm gear sliding drive, which is reliable and has a self-locking characteristic. The isolating moving contact is driven to slide vertically by the worm gear transmission mechanism. With the guidance structure of the limit pin and guide groove, the linearity and reliability of the movement of the isolating moving contact are ensured. The worm gear transmission has a self-locking characteristic, which can ensure that the isolating switch is stably maintained in the open or closed position and will not be accidentally disengaged due to vibration or external force. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 , 2 This is an overall schematic diagram provided for an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the closing cross-section provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the tripping section provided in an embodiment of the present invention; Figure 6 This is a schematic cross-sectional view of the isolation observation window provided in an embodiment of the present invention; Figure 7 This is a schematic cross-sectional view of a vacuum interrupter provided in an embodiment of the present invention.

[0026] The following are the labeling elements in the figure: 1. Shell; 11. Vacuum-sealed cavity; 12. Isolation chamber; 2. Vacuum interrupter; 21. Moving end contact of vacuum interrupter; 22. Stationary end contact of vacuum interrupter; 23. Vacuum end sliding contact; 24. Incoming line contact; 25. Connecting busbar; 26. Flexible connector; 3. Disconnector assembly; 31. Disconnecting moving contact; 32. Disconnecting stationary contact; 33. Grounding contact; 34. Disconnecting worm gear; 35. Outgoing limit pin; 36. Outgoing contact; 4. Operating mechanism; 41. Insulating pull rod; 42. Insulating pull rod adjusting rod; 43. Insulating pull rod connecting rod; 5. Isolation observation window; 51. Upper observation window; 511. Upper observation window thread; 52. Lower observation window; 521. Lower observation window thread; 53. Upper end face sealing ring; 54. Lower end face sealing ring; 55. Middle sealing ring; 56. Snap ring; 6. Incoming high-voltage capacitor compartment; 61. Incoming capacitor equalizing mesh; 7. Outgoing high-voltage capacitor compartment; 71. Outgoing capacitor equalizing mesh; 8. Current sensor; 9. Spring contact finger.

[0027] The accompanying drawings have illustrated specific embodiments of the invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0028] To make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] Please see Figures 1 to 7 The present invention provides an integrated pole-mounted switch housing that integrates dual-break and dual-terminal voltage sensing, including a housing 1, a vacuum interrupter 2, an isolating switch assembly 3, an operating mechanism 4, an isolating observation window 5, an incoming line voltage sensor, an outgoing line voltage sensor, and a current sensor 8.

[0030] The housing 1 is integrally cast from epoxy resin using an automated pressure gelation process. Inside the housing 1 are parallel, vertically aligned vacuum break chamber 11 and isolation chamber 12. A vacuum interrupter chamber 2 is located within the vacuum break chamber 11, with a silicone buffer layer between them. The disconnector assembly 3 is located within the isolation chamber 12. The vertically aligned arrangement of the vacuum break chamber 11 and isolation chamber 12 integrates the vacuum break and isolation break within the same housing without interference. Compared to existing designs where the disconnector is externally mounted or horizontally arranged, this design maximizes the reduction of the overall housing volume, resulting in a more compact structure.

[0031] An operating mechanism 4 is installed below the vacuum interrupter 2. An inlet contact 24 is provided between the operating mechanism 4 and the vacuum interrupter 2, extending to the right out of the housing 1. A current sensor 8 is installed inside the housing 1, surrounding the inlet contact 24. The current sensor 8 is used to collect the three-phase current and zero-sequence current signals on the load side, achieving deep integration of primary and secondary currents. An inlet high-voltage capacitor compartment 6 is provided at the inlet contact 24, and an outlet high-voltage capacitor compartment 7 is provided at the outlet contact 36.

[0032] The vacuum interrupter 2 is equipped with a moving end contact 21 and a stationary end contact 22. The top of the stationary end contact 22 is fixedly connected to the connecting busbar 25. The bottom of the moving end contact 21 is fixedly connected to the insulating pull rod 41 via an insulating pull rod connecting rod 43. The insulating pull rod 41 is connected to the insulating pull rod adjusting rod 42, and an adjusting mechanism is provided between the insulating pull rod 41 and the insulating pull rod adjusting rod 42. A vacuum end sliding contact 23 is sleeved on the insulating pull rod connecting rod 43, and a spring contact finger 9 is sleeved on the vacuum end sliding contact 23. The spring contact finger 9 abuts against the sleeve of the incoming line contact 24. A flexible connector 26 is wrapped under the moving end contact 21. The flexible connector 26 is made of pure copper and is made of copper sheet. It can be bent at will, which not only ensures the conduction of current, but also provides a flexible connection between the vacuum interrupter 2 and the disconnector assembly 3. When the drive mechanism pulls or pushes the insulating pull rod adjusting rod 42, the insulating pull rod adjusting rod 42 sequentially drives the insulating pull rod 41, the insulating pull rod connecting rod 43, the vacuum end sliding contact 23, the spring contact finger 9, and the vacuum interrupter moving end contact 21 to move up and down. When the vacuum interrupter moving end contact 21 contacts the vacuum interrupter stationary end contact 22, the vacuum break is closed; when the two separate, the vacuum break is opened. Because the breaking process occurs in a vacuum environment, the arc generated by the rated load can be effectively extinguished.

[0033] The disconnector assembly 3 includes an isolating moving contact 31, an isolating stationary contact 32, a grounding contact 33, an isolating worm gear 34, a lead-out limiting pin 35, and a lead-out contact 36. The top of the isolating stationary contact 32 is fixedly connected to the other end of the connecting busbar 25 and is located on the upper part of the housing 1. The isolating moving contact 31 has a long cylindrical structure with internal threads that match the isolating worm gear 34. The isolating moving contact 31 has an axially extending guide groove on its exterior. A lead-out limiting pin 35 is provided at the lead-out contact 36, which abuts against the guide groove to prevent the isolating moving contact 31 from rotating and ensure that it can only move linearly in the vertical direction. The isolating stationary contact 32 is provided with a spring contact finger 9 that abuts against the isolating moving contact 31, and the sleeve of the lead-out contact 36 and the grounding contact 33 at the bottom of the housing 1 are also provided with spring contact fingers 9. When the isolating worm gear 34 is driven to rotate by the motor, the isolating moving contact 31 can only move vertically up and down because its circumferential rotation is restricted by the lead-out limit pin 35. The vertical movement direction of the isolating moving contact 31 is controlled by the forward and reverse rotation of the motor.

[0034] When the isolating moving contact 31 rises to the top, its upper and lower ends are electrically connected to the isolating stationary contact 32 and the outgoing contact 36, respectively, to achieve closing. When the isolating moving contact 31 descends to the bottom, its upper and lower ends are electrically connected to the outgoing contact 36 and the grounding contact 33, respectively, to achieve opening and grounding. The isolating moving contact 31 is driven by a worm gear and worm wheel sliding mechanism, which significantly reduces the space requirement of the isolating break on the internal housing compared to the structure of the rotary isolating switch in the prior art. At the same time, the worm gear and worm wheel drive has a self-locking characteristic, which can ensure that the isolating switch is stably maintained in the open or closed position and will not be accidentally disengaged due to vibration or external force. The surface of the isolating worm 34 is provided with a color marking layer, preferably green, for intuitive judgment of the open or closed status in conjunction with the isolating observation window 5.

[0035] Please see Figure 4 When the switch is in the closed state, the main circuit path is: incoming contact 24 → spring contact finger 9 → vacuum end sliding contact 23 → vacuum interrupter moving end contact 21 → vacuum interrupter stationary end contact 22 → connecting busbar 25 → isolation stationary contact 32 → spring contact finger 9 → isolation moving contact 31 → spring contact finger 9 → outgoing contact 36.

[0036] The tripping operation is performed in two steps. First, vacuum break tripping: The insulating pull rod adjusting rod 42 is pulled down by the operating mechanism 4, causing the insulating pull rod 41 to move downwards as a whole. The insulating pull rod connecting rod 43 fixes the vacuum end sliding contact 23 to the vacuum interrupter moving end contact 21 via bolts. The vacuum interrupter moving end contact 21 and the vacuum interrupter stationary end contact 22 separate, forming a vacuum break. Because the tripping process occurs in a vacuum environment, it can effectively extinguish the arc generated by the rated load. Second, isolating break tripping: After vacuum break tripping, the isolating worm gear 34 rotates via a motor. Because the isolating moving contact 31 is restricted from rotation by the outgoing line limit pin 35, the isolating moving contact 31 slides downwards under the drive of the isolating worm gear 34 until it engages with the grounding contact 33, completing the isolating tripping and grounding process. At this time, the isolating switch forms a clearly visible break point, ensuring the safety of the equipment and maintenance personnel.

[0037] An isolation observation window 5 is located on the housing 1 at a position corresponding to the isolation chamber 12, and is used to observe the opening and closing status of the disconnecting switch assembly 3. The isolation observation window 5 includes an upper observation window 51, a lower observation window 52, ​​an upper end face sealing ring 53, a lower end face sealing ring 54, a middle sealing ring 55, and a retaining ring 56. Both the upper observation window 51 and the lower observation window 52 are cylindrical transparent structures, preferably injection molded from transparent epoxy resin or transparent polycarbonate. The upper observation window 51 is larger than the lower observation window 52, ​​and the two are nested together and can slide relative to each other. The upper observation window 51 is fitted over the lower observation window 52, ​​forming a sliding mating surface between them. The upper observation window 51 has an upper observation window thread 511 on its top inner side, and the lower observation window 52 has a lower observation window thread 521 on its bottom inner wall. The housing 1 has threads that mate with the upper observation window thread 511 and threads that mate with the lower observation window thread 521. The upper observation window 51 is threaded to the housing 1 via an upper observation window thread 511, and the lower observation window 52 is threaded to the housing 1 via a lower observation window thread 521. An upper end face sealing ring 53 is positioned between the upper observation window 51 and the housing 1, a lower end face sealing ring 54 is positioned between the lower observation window 52 and the housing 1, and an intermediate sealing ring 55 is positioned between the nested sliding mating surfaces of the upper and lower observation windows 51 and 52. All three sealing rings are O-rings, used to prevent moisture and dust from entering the isolation chamber 12 through different paths, ensuring that the sealing performance of the housing 1 is not affected. A retaining ring groove is provided on the outer wall of the lower observation window 52, ​​and a retaining ring 56 is engaged in the retaining ring groove.

[0038] During assembly, the upper observation window 51 and the lower observation window 52 are first screwed into their corresponding threaded holes. At this time, the upper observation window 51 and the lower observation window 52 are stretched and unfolded, exposing the retaining ring groove on the lower observation window 52. Then, the retaining ring 56 is inserted into the retaining ring groove, which can limit the relative sliding displacement between the upper observation window 51 and the lower observation window 52 and prevent the threaded fit from loosening due to running vibration. The isolation observation window 5 adopts a post-installation structure, that is, the isolation observation window 5 is installed after the shell 1 is cast. This post-installation method greatly facilitates the installation and debugging of related accessories, avoids the problem of the inability to adjust the position deviation of the observation window in the traditional one-piece casting scheme, and also facilitates later maintenance and replacement.

[0039] When the disconnector assembly 3 is in the open grounded state, the isolating moving contact 31 slides downward to engage with the grounding contact 33. The upper observation window 51 and lower observation window 52 of the isolation observation window 5 are in the open state, allowing the operator to directly see the internal isolating worm gear 34 through the transparent observation window. Since the surface of the isolating worm gear 34 has a green marking layer, the visible green worm gear indicates that the disconnector has been opened. When the disconnector assembly 3 is in the closed state, the isolating moving contact 31 slides upward to engage with the isolating stationary contact 32 and the outgoing contact 36. At this time, the upper observation window 51 and lower observation window 52 of the isolation observation window 5 are in the retracted state, and the green isolating worm gear 34 is obscured by the isolating moving contact 31. The absence of the green worm gear indicates that the disconnector is in the closed state. This method of judging the disconnector status by whether the green worm gear is visible through the observation window is intuitive and clear. Even at night or in environments with insufficient light, the operator can quickly and accurately determine the open / closed state of the disconnector, effectively avoiding the risk of misoperation.

[0040] The input-side voltage sensor and the output-side voltage sensor are respectively located on the input contact 24 side and the output contact 36 side of the housing 1. The housing 1 has an input high-voltage capacitor compartment 6 at the input contact 24 and an output high-voltage capacitor compartment 7 at the output contact 36. The input high-voltage capacitor compartment 6 contains the high-voltage capacitor for the input-side voltage sensor, and an input capacitor equalization mesh 61 is installed on its top, electrically connected to the input contact 24. The output high-voltage capacitor compartment 7 contains the high-voltage capacitor for the output-side voltage sensor, and an output capacitor equalization mesh 71 is installed on its top, electrically connected to the output contact 36. Both the input-side and output-side voltage sensors are capacitive voltage divider type sensors. The high-voltage capacitor is preferably a ceramic capacitor, which is characterized by its small size, large capacity, and long lifespan.

[0041] Both the incoming capacitor equalizing mesh 61 and the outgoing capacitor equalizing mesh 71 are annular metal equalizing meshes, used to equalize the electric field at the high-voltage end of their respective high-voltage capacitors, reduce the unit electric field strength at the high-voltage end of the capacitors, and prevent insulation breakdown or partial discharge. The incoming and outgoing voltage sensors are horizontally arranged opposite each other inside the housing 1, located on opposite sides of the isolation chamber 12. This layout avoids the drawback of existing technologies that require a conductor to cross the vacuum interrupter from the incoming side to the outgoing side, eliminating electric field distortion and discharge risks caused by the bridging conductor. The incoming and outgoing voltage sensors are located on opposite sides of the isolation chamber, effectively increasing the creepage distance at the break point, which is beneficial for insulation coordination of the power frequency withstand voltage at the break point. Each voltage sensor is equipped with an independent equalizing mesh, effectively improving the local electric field distribution.

[0042] The following section will further explain its working principle in conjunction with its usage. For example... Figure 4As shown, during closing, the motor first drives the isolating worm gear 34 to rotate. Guided by the outgoing line limit pin 35, the isolating moving contact 31 slides upwards until it connects with the isolating stationary contact 32 and the outgoing line contact 36. Then, the operating mechanism 4 drives the insulating pull rod adjusting rod 42 upwards, which, through the insulating pull rod 41 and the insulating pull rod connecting rod 43, causes the moving end contact 21 of the vacuum interrupter to contact the stationary end contact 22 of the vacuum interrupter, completing the closing process. Figure 5 As shown, during opening, the operating mechanism 4 first drives the insulating pull rod adjusting rod 42 downwards. This, through the insulating pull rod 41 and the insulating pull rod connecting rod 43, causes the moving end contact 21 of the vacuum interrupter to separate from the stationary end contact 22, thus opening the vacuum break. Then, the motor drives the isolating worm gear 34 to rotate, and the isolating moving contact 31 slides downwards under the guidance of the outgoing line limit pin 35 until it engages with the grounding contact 33, thus opening the isolating break and grounding. The two breaks open sequentially to ensure safety and reliability. When opening, the observation window is open, revealing the green isolating worm gear 34; when closing, the observation window retracts, obscuring the green isolating worm gear 34. The operator can visually judge the opening and closing status of the isolating switch through the observation window.

[0043] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

[0044] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A one-piece column-mounted switch housing integrating dual-break and dual-terminal voltage sensing, characterized in that: Includes housing (1), vacuum interrupter (2), disconnector assembly (3), isolation observation window (5), incoming line voltage sensor and outgoing line voltage sensor; The housing (1) is provided with a vacuum interrupt chamber (11) and an isolation chamber (12) arranged in parallel along the vertical direction. The vacuum interrupt chamber (2) is located in the vacuum interrupt chamber (11), and the isolation switch assembly (3) is located in the isolation chamber (12). The isolation observation window (5) is disposed on the housing (1) at a position corresponding to the isolation chamber (12). The isolation observation window (5) includes an upper observation window (51) and a lower observation window (52) that can slide relative to each other. The upper observation window (51) and the lower observation window (52) are respectively connected to the housing (1). The incoming voltage sensor is located on the incoming side of the housing (1), and the outgoing voltage sensor is located on the outgoing side of the housing (1). The incoming voltage sensor and the outgoing voltage sensor are located on both sides of the isolation chamber (12).

2. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 1, characterized in that: The disconnector assembly (3) includes an isolating moving contact (31) and a worm gear transmission mechanism for driving the isolating moving contact (31) to reciprocate in the vertical direction, the worm gear transmission mechanism including an isolating worm (34).

3. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 2, characterized in that: The isolating moving contact (31) is a cylindrical structure with a thread inside that matches the isolating worm (34). The isolating moving contact (31) has an axially extending guide groove on its outside. The outlet contact (36) is provided with an outlet limiting pin (35) that abuts against the guide groove. The outlet limiting pin (35) is used to restrict the circumferential rotation of the isolating moving contact (31) and guide it to slide in the vertical direction.

4. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 1, characterized in that: The upper observation window (51) and the lower observation window (52) are both cylindrical structures and nested together. An intermediate sealing ring (55) is provided between the upper observation window (51) and the lower observation window (52).

5. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 1, characterized in that: The upper observation window (51) has an upper observation window thread (511) on its top inner side, and the lower observation window (52) has a lower observation window thread (521) on its bottom inner wall. The housing (1) has a thread that mates with the upper observation window thread (511) and a thread that mates with the lower observation window thread (521). The upper observation window (51) and the lower observation window (52) are respectively connected to the housing (1) by threads.

6. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 1, characterized in that: The isolation observation window (5) further includes an upper end face sealing ring (53), a lower end face sealing ring (54), and a retaining ring (56); the upper end face sealing ring (53) is disposed between the upper observation window (51) and the housing (1), and the lower end face sealing ring (54) is disposed between the lower observation window (52) and the housing (1); the lower observation window (52) is provided with a retaining ring groove, and the retaining ring (56) is engaged in the retaining ring groove to restrict the relative sliding between the upper observation window (51) and the lower observation window (52).

7. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 2, characterized in that: The surface of the isolation worm (34) is provided with a color marking layer.

8. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 1, characterized in that: Both the input voltage sensor and the output voltage sensor are capacitive voltage divider type voltage sensors, each including a high voltage capacitor and an equalizing grid; the housing (1) has an input high voltage capacitor compartment (6) at the input contact (24), and the input high voltage capacitor compartment (6) contains the high voltage capacitor of the input voltage sensor and the input capacitor equalizing grid (61); the housing (1) has an output high voltage capacitor compartment (7) at the output contact (36), and the output high voltage capacitor compartment (7) contains the high voltage capacitor of the output voltage sensor and the output capacitor equalizing grid (71).

9. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 1, characterized in that: A current sensor (8) is also provided inside the housing (1), and the current sensor (8) surrounds the outer periphery of the incoming contact (24).

10. The integrated column-mounted switch housing with dual-break and dual-terminal voltage sensing according to claim 1, characterized in that: The isolation observation window (5) is a post-installed structure, that is, the isolation observation window (5) is installed after the shell (1) is cast.

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