A pole-mounted circuit breaker

Abstract

This application relates to the field of circuit breaker technology, specifically disclosing a pole-mounted circuit breaker. The pole-mounted circuit breaker includes a base, three breaking poles, a support frame, a lifting frame, a drive unit, and three insulating supports. The three breaking poles and the support frame are all fixed to the base. Each breaking pole has a first terminal, a vacuum circuit breaker, and an internal terminal that are electrically connected in sequence. Each insulating support has a second terminal. The lifting frame and the drive unit are mounted on the support frame. The support frame has multiple parallel vertical guide rods. The lifting frame has three switches. The drive unit can drive the lifting frame to move along the vertical guide rods, using the weight of the lifting frame to connect each switch to an internal terminal and a second terminal, or drive the switch to disengage from the internal terminal and the second terminal. The lifting frame can move stably up and down along the vertical guide rods, ensuring precise connection or separation between the switches and the internal and second terminals, reducing the likelihood of poor closing contact.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, specifically to a pole-mounted circuit breaker. Background Technology

[0002] Pole-mounted circuit breakers are circuit breakers installed and operated on utility poles. The pole-mounted circuit breakers on each circuit are distributed in a tiered manner, dividing long-distance power distribution lines into several sections. If a problem occurs in any section of the circuit, the circuit breaker on that section is disconnected, allowing for repairs and minimizing the power outage area.

[0003] Pole-mounted circuit breakers feature vacuum interrupters, offering advantages such as strong arc-extinguishing capability, long lifespan, maintenance-free operation, and environmental friendliness. When a short circuit or overload occurs in the line or equipment, the relay protection device will immediately and automatically issue a "trip" command, causing the contact electrodes of the vacuum interrupter to quickly separate and disconnect the circuit.

[0004] While vacuum circuit breakers can interrupt current very efficiently, their contacts are not visible from the outside after opening, making it impossible to visually confirm whether the moving and stationary contacts have truly separated to a safe distance. Theoretically, it has disconnected, but in the event of an internal fault (such as a vacuum bulb leak or insulation damage), the contacts may not actually have separated effectively, or the insulation may be insufficient. This poses a fatal hazard to maintenance personnel who need to access the line. Even if the vacuum circuit breaker is functioning normally, a very small capacitive leakage current may still exist between its contacts after it has fully tripped. For high-voltage lines, this tiny current is sufficient to threaten personal safety.

[0005] Therefore, the primary purpose of installing a disconnecting switch on a pole-mounted vacuum circuit breaker is to create a visible, safe electrical disconnect point with a large air gap, thereby protecting the safety of maintenance personnel. When the disconnecting switch is open, the separation between its knife switch and contacts is clearly visible, allowing maintenance personnel to immediately confirm that the line has been physically isolated. This provides workers with the most direct and reliable confidence in their safety. After the disconnecting switch is opened, the air insulation distance between the contacts is much greater than the external insulation distance of the vacuum circuit breaker. This effectively withstands overvoltages in the line and ensures that even a small leakage current is completely interrupted.

[0006] However, current disconnect switches, such as the disconnect switch of the ZW32 circuit breaker, use a rotating handle to open and close the disconnect switch. It adopts a multi-hinge structure. After long-term use, the hinges are prone to deformation and wear, resulting in loosening. When opening and closing the knife switch, the knife switch has a large lateral offset distance. Especially when closing, the knife switch cannot fit properly with the contacts, resulting in poor contact. Summary of the Invention

[0007] Given that the disconnecting switch of the circuit breaker is opened and closed by rotating the handle, and it adopts a multi-hinge structure, the hinges are prone to deformation and wear after long-term use, resulting in loosening. When opening and closing the switch, the switch has a large lateral offset distance. Especially when closing, the switch cannot be properly engaged with the contact, causing poor contact. This application proposes a pole-mounted circuit breaker that can accurately and permanently engage the switch and contact. To this end, this application adopts the following technical solution.

[0008] A pole-mounted circuit breaker includes a base, three circuit breaking poles, a support frame, a lifting frame, a drive unit, and three insulating supports.

[0009] The three circuit breaker terminals and the support frame are all fixed to the base.

[0010] Each of the circuit breaker poles has a first terminal, a vacuum circuit breaker, and an internal terminal that are electrically connected in sequence. Each of the insulating posts is equipped with a second terminal.

[0011] The lifting frame and the drive unit are mounted on the support frame. The support frame has multiple parallel vertical guide rods. The lifting frame has three knife gates.

[0012] The drive device can drive the lifting frame to move along the vertical guide rod, and use the gravity of the lifting frame to connect each of the switches to an inner terminal and a second terminal, or drive the switches to disconnect from the inner terminal and the second terminal.

[0013] By adopting the above technical solution, compared with the multi-hinge structure, the pole-mounted circuit breaker of this solution is less prone to deformation, wear, and loosening after long-term use. The lifting frame can still move stably up and down along the vertical guide rod, so that the switch knife and the inner terminal and the second terminal can be accurately connected or separated. The gravity of the lifting frame is used to complete the closing of the switch knife and the inner terminal and the second terminal, which is less likely to cause poor closing contact.

[0014] A preferred embodiment of the pole-mounted circuit breaker is that the support frame has four top edge rods, four side posts, two side crossbars, and six vertical guide rods. The four top edge rods form a rectangular top plane, the upper ends of the four side posts are fixed to the four corners of the rectangle, and the lower ends of the four side posts are fixed to the base. The upper ends of three of the vertical guide rods are fixed to the front top edge rods, one side crossbar connects to the lower ends of the three vertical guide rods, and both ends of the side crossbar are fixed to the two side posts. The upper ends of the other three vertical guide rods are fixed to the rear top edge rods, another side crossbar connects to the lower ends of the three vertical guide rods, and both ends of the side crossbar are fixed to the other two side posts. The lifting frame is slidably connected to the six vertical guide rods.

[0015] By adopting the above technical solution, the lifting frame can move freely up and down on the support frame.

[0016] In a preferred embodiment of the pole-mounted circuit breaker, each of the side crossbars is located above the inner terminal and the second terminal.

[0017] By adopting the above technical solution, the support frame avoids the inner terminal and the second terminal, and also avoids the wires connected to the second terminal, thus preventing the generation of electric arcs.

[0018] A preferred embodiment of the pole-mounted circuit breaker includes a lifting frame with three vertical rods, several insulating rods, and a horizontal rod. Each vertical rod is slidably connected at both ends to a vertical guide rod, and the horizontal rod connects to the three vertical rods. Each vertical rod is connected downwards to a knife switch via several insulating rods. The drive unit is connected to the vertical rods and / or the horizontal rods.

[0019] By adopting the above technical solution, the three switches move synchronously, and the switches, longitudinal rods, and support frames are insulated to protect the safety of maintenance personnel.

[0020] A preferred embodiment of the pole-mounted circuit breaker includes a support frame that further comprises a top longitudinal rod and a central column. The top longitudinal rod is fixed to two opposite top edge rods. The upper and lower ends of the central column are fixed to the top edge rods and the base. The central column has mounting holes, vertical sliding grooves, and limiting members from top to bottom.

[0021] The drive device includes two fixed pulleys, a suspension rope, a slider, and a handle. The first fixed pulley is installed below the top vertical rod, and the second fixed pulley is installed in the mounting hole. The front end of the suspension rope passes around the two fixed pulleys and connects to the junction of the middle vertical rod and the horizontal rod.

[0022] The six vertical guide rods located on the front and rear sides are positioned in pairs opposite each other. The top longitudinal rod is offset relative to the middle pair of vertical guide rods towards the limiting post, such that the vertical rope segment of the suspension rope located between the first fixed pulley and the horizontal bar is parallel to the vertical guide rods.

[0023] The rear end of the suspension rope is fixed to the slider and the handle, and the slider is embedded in the vertical sliding groove. Pulling the handle downward and wrapping it around the bottom of the limiting member, then releasing the handle, the handle is locked by the limiting member and cannot move upward, and all three switches are disengaged from the inner terminal and the second terminal.

[0024] By adopting the above technical solution, the suspension rope will not detach from the movement track. After the lifting frame is lifted by pulling the suspension rope, the end of the suspension rope can be locked onto the limiting device to maintain the lifting frame in the lifted state. Releasing the end of the suspension rope from the limiting device and releasing the suspension rope allows the lifting frame to fall freely, thereby enabling the switch to electrically connect the inner and second terminals, realizing the opening and closing of the switch.

[0025] A preferred embodiment of the pole-mounted circuit breaker includes each switch comprising two metal bars, two fasteners, and several springs. The two metal bars are parallel and opposite each other, and each fastener is connected in series with one end of both metal bars. Each fastener has a left-end protrusion, a middle protrusion, and a right-end protrusion. The middle protrusion is located between the two metal bars. The left-end and right-end protrusions are located on opposite sides of the two metal bars, respectively. Both the inner terminal and the second terminal are upright and have a smooth, curved top surface. At least one spring is installed between the left-end protrusion and the left-side metal bar, and between the right-end protrusion and the right-side metal bar, such that when the switch is disengaged from the inner terminal and the second terminal, the spring compresses the metal bars, making the distance between the two metal bars less than the width of the inner terminal and the width of the second terminal.

[0026] By adopting the above technical solution, the central protrusion can expand the two metal strips, preventing them from being pressed together by the spring force after the switch detaches from the inner terminal and the second terminal. This would prevent the gap between the two metal strips from being too small to be reattached to the inner terminal or the second terminal. The distance between the two metal strips expanded by the central protrusion is smaller than the width of the inner terminal and the width of the second terminal, so that after the two metal strips are reattached to the inner terminal or the second terminal, they can be compressed by the spring to clamp the inner terminal and the second terminal, achieving a secure electrical connection.

[0027] A preferred embodiment of the pole-mounted circuit breaker is that the lifting frame has six insulating rods, and a central protrusion is fixed to the lower end of each insulating rod.

[0028] By adopting the above technical solution, the lifting frame is lowered so that when the switch is electrically connected to the inner terminal and the second terminal, the insulating rod, the inner terminal, and the second terminal do not deflect. Instead, the switch is fitted onto the inner terminal and the second terminal by the two metal strips slightly opening, so that the lifting frame can move up and down stably without deflection. With long-term use, the switch can fit snugly with the inner terminal and the second terminal, and make good contact.

[0029] A preferred embodiment of the pole-mounted circuit breaker is as follows: the width of the inner terminal is equal to the width of the second terminal; the two metal strips are identical; the plurality of springs are all identical; a spring is installed between the left end protrusion and the metal strip, and a spring is installed between the right end protrusion and the metal strip. When the switch is disengaged from the inner terminal and the second terminal, the two springs are of equal length, the two metal strips clamp the middle protrusion, and the center line of the middle protrusion is aligned downwards with the center line of the inner terminal and the center line of the second terminal.

[0030] By adopting the above technical solution, when the switch engages the inner terminal and the second terminal, the elastic force of the springs on both sides is equal, the clamping force of the two metal strips on both sides of the inner terminal is equal, and the clamping force of the two metal strips on both sides of the second terminal is equal, making it less likely for poor contact to occur on one side.

[0031] In summary, the pole-mounted circuit breaker of this application has the following beneficial effects: Compared with the multi-hinge structure, the pole-mounted circuit breaker of this solution realizes the engagement or disengagement of the switch knife through the guide structure. Due to the stability of the guide structure, the lifting frame of the pole-mounted circuit breaker can still move stably up and down along the vertical guide rod after long-term use, so that the switch knife and the inner and second terminals are accurately connected or separated, and it is not easy to cause poor closing contact. Attached Figure Description

[0032] Figure 1 This is the front view of the pole-mounted circuit breaker.

[0033] Figure 2 for Figure 1 The right view.

[0034] Figure 3 for Figure 1 Rear view.

[0035] Figure 4 for Figure 1 A stereoscopic view from the left side.

[0036] Figure 5 for Figure 1 The left view.

[0037] Figure 6 for Figure 1 A rear-view stereoscopic image.

[0038] Figure 7 for Figure 1 A stereoscopic view from an upward perspective.

[0039] Figure 8 for Figure 7 Enlarged view of region A.

[0040] Reference numerals: 1. Base; 2. Circuit breaker pole; 3. Support frame; 4. Lifting frame; 5. Drive unit; 6. Insulating support column; 21. First terminal; 22. Inner terminal; 23. Current transformer; 11. Opening / closing handle; 12. Energy storage handle; 13. Energy storage indicator; 14. Opening / closing indicator; 15. Grounding contact; 61. Second terminal; 41. Knife switch; 31. Top edge rod; 32. Side post; 33. Side crossbar; 34. Vertical guide rod; 3 5. Top longitudinal rod; 36. Middle column; 361. Mounting hole; 362. Vertical slide groove; 363. Limiting component; 51. Fixed pulley; 52. Lifting rope; 53. Sliding block; 54. Handle; 42. Longitudinal rod; 43. Insulating rod; 44. Horizontal rod; 421. Cylindrical sleeve; 521. Vertical rope segment; 411. Metal strip; 412. Fastener; 413. Spring; 4121. Left end protrusion; 4122. Middle protrusion; 4123. Right end protrusion; 414. Arc extinguishing cover. Detailed Implementation

[0041] The technical solutions in the embodiments are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the following embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] refer to Figure 1 and Figure 2 A pole-mounted circuit breaker is installed in a high-voltage line to disconnect the line when necessary. The pole-mounted circuit breaker includes a base 1, three breaking poles 2, a support frame 3, a lifting frame 4, a drive unit 5, and three insulating supports 6.

[0043] Three circuit breaker terminals 2 are fixed on the base 1 and arranged in a horizontal line. Each circuit breaker terminal 2 has a first terminal 21, a vacuum circuit breaker, and an inner terminal 22 that are electrically connected in sequence. The first terminal 21 is located at the top of the circuit breaker terminal 2. The vacuum circuit breaker includes a vacuum interrupter, and a fixed electrode and a moving electrode within the vacuum interrupter. The first terminal 21 is connected to the fixed electrode, and the moving electrode is connected to the inner terminal 22. The circuit breaker terminal 2 may also include a current transformer 23, in which case the moving electrode is connected to the current transformer 23, and the current transformer 23 is connected to the inner terminal 22. The current transformer 23 (CT) is used to detect the line current. The controller receives the current signal, makes a judgment based on the set protection settings (such as overcurrent and delay time), and issues opening and closing commands to realize automatic opening and closing.

[0044] The pole-mounted circuit breaker can also be manually opened and closed. A power mechanism is installed in the base 1, and the outer wall of the base 1 is equipped with an opening / closing handle 11, an energy storage handle 12, an energy storage indicator needle 13, an opening / closing indicator needle 14, and a nameplate. Reciprocatingly moving the energy storage handle 12 provides energy to the power mechanism, causing the energy storage indicator needle 13 to deflect to the stored energy position. At this point, turning the opening / closing handle 11 counterclockwise or clockwise releases the energy of the power mechanism, thereby driving the moving electrode to move away from or engage with the stationary electrode, thus achieving one manual opening and closing operation.

[0045] For example, if the automatic switching mechanism fails during power outage maintenance, manual switching can be performed. Maintenance can only proceed after the switch has been opened. A grounding contact 15 can also be installed on the base 1, which can be connected to a grounding wire to release residual charge in the line and ground it to prevent damage from sudden power restoration.

[0046] Since it is not visible from the outside whether the stationary and moving electrodes of a vacuum circuit breaker are truly separated to a safe distance, installing a disconnecting switch on the pole-mounted circuit breaker creates a visible, safe electrical disconnect point with a large air gap, thereby protecting the safety of maintenance personnel.

[0047] The disconnecting switch of the pole-mounted circuit breaker of this application is disposed within three internal terminals 22, a lifting frame 4, and three insulating supports 6. The three insulating supports 6 are fixed to the base 1 and arranged in a horizontal line, parallel to the horizontal line where the three circuit breaking poles 2 are located. Each insulating support 6 has a second terminal 61 at its top. The lifting frame 4 has three knife switches 41. By manually raising and lowering the knife switches 41, both ends of the knife switches 41 are disconnected from the internal terminals 22 and the second terminals 61, creating a visible electrical disconnection point. Both the first terminal 21 and the second terminal 61 can be connected to external wires, one as an input terminal and the other as an output terminal. The specific structure of the disconnecting switch of the pole-mounted circuit breaker of this application is as follows.

[0048] The support frame 3 adjacent to the three disconnect poles 2 is fixed on the base 1. The support frame 3 has six parallel vertical guide rods 34. The lifting frame 4 is slidably mounted on these six vertical guide rods 34. The drive device 5 is also mounted on the support frame 3 and connected to the lifting frame 4. Manually pulling the drive device 5 can drive the lifting frame 4 to rise along the vertical guide rods 34, causing the three switches 41 mounted on the lifting frame 4 to disengage from the three sets of opposite inner terminals 22 and second terminals 61. This disengagement distance can be 0.5 meters to 1 meter, etc., to avoid arcing due to excessive distance. Releasing the drive device 5 causes the lifting frame 4 to descend along the vertical guide rods 34 under its own weight, causing the three switches 41 mounted on the lifting frame 4 to electrically connect the three sets of opposite inner terminals 22 and second terminals 61. By setting an appropriate weight for the lifting frame 4 and a release distance, the switches 41 can accurately engage the inner terminals 22 and second terminals 61 with minimal deviation and poor contact.

[0049] refer to Figure 3 and Figure 4 One specific structure of the support frame 3 is that the support frame 3 has four top edge rods 31, four side columns 32, two side cross rods 33, six vertical guide rods 34, a top longitudinal rod 35, and a central column 36.

[0050] Four top edge rods 31 form a rectangular top plane at the top. The upper ends of four side posts 32 are fixed to the four corners of this rectangle, and the lower ends of the four side posts 32 are fixed to the base 1. The upper ends of three vertical guide rods 34 are fixed to the front top edge rods 31. A side horizontal rod 33 connects the lower ends of these three vertical guide rods 34, and the two ends of the side horizontal rod 33 are connected to the two front side posts 32. The upper ends of the other three vertical guide rods 34 are fixed to the rear top edge rods 31. Another side horizontal rod 33 connects the lower ends of these three vertical guide rods 34, and the two ends of the side horizontal rod 33 are connected to the two rear side posts 32. Here, "front side" refers to the side closer to the three disconnect poles 2, "rear side" refers to the side farther from the disconnect poles 2, "lateral" refers to the horizontal direction parallel to the rear or front side, and "longitudinal" refers to the horizontal direction perpendicular to the lateral direction. The vertical guide rods 34 on the front and rear sides are symmetrically arranged, and the six vertical guide rods 34 are of equal length. Both side crossbars 33 are located above the inner terminal 22 and the second terminal 61, thus avoiding each other, and the side crossbars 33 do not interfere with the wires connected to the outside on the second terminal 61.

[0051] The upper end of the central column 36 is fixed to the top edge rod 31 on the left side, and the lower end is fixed to the base 1. The top vertical rod 35 is vertically connected to the two top edge rods 31 on the front and rear sides, and is slightly closer to the central column 36 relative to a set of opposing vertical guide rods 34 in the middle.

[0052] refer to Figure 5 The central column 36 has a mounting hole 361, a vertical sliding groove 362, and a limiting member 363 arranged from top to bottom. The central column 36 is rectangular, and the mounting hole 361 is a square through hole with a horizontal axis passing through its center. The limiting member 363 consists of two protruding rods at the same height and perpendicular to the column surface. The outer ends of the rods can be enlarged, such as spherical or square.

[0053] The drive unit 5 includes two fixed pulleys 51, a suspension rope 52, a slider 53, and a handle 54. The first fixed pulley 51 is installed below the top vertical rod 35, and the second fixed pulley 51 is installed on the horizontal shaft in the mounting hole 361, with both sides of the second fixed pulley 51 extending beyond the mounting hole 361. The front section of the suspension rope 52 passes over the two fixed pulleys 51 and is connected downwards to the lifting frame 4. The rear section of the suspension rope 52 is located outside the central column 36 and is fixedly connected to the slider 53, which can be a sphere. The slider 53 is embedded in the vertical sliding groove 362 of the central column 36. The handle 54 is vertically fixed to the suspension rope 52. The handle 54 can be a straight rod with a length greater than the distance between the two protruding rods of the limiting member 363. To raise the lifting frame 4, grip the handle 54 with both hands and pull downwards. The slider 53 moves along the vertical slide groove 362, preventing the hoisting rope 52 from detaching from the fixed pulley 51, etc. Then, pull the handle 54 outwards, around the limiting member 363, and place it under the limiting member 363. Release the handle 54, and the limiting member 363 will lock the handle 54, thus fixing the lifting frame 4 and preventing it from falling. Pull the handle 54 and wrap it around the limiting member 363. Release the handle 54 at the appropriate height, and the lifting frame 4 will fall, causing the three switches 41 on the lifting frame 4 to engage with the inner terminal 22 and the second terminal 61, respectively.

[0054] refer to Figure 4 In addition to three switch blades 41, the lifting frame 4 also has three vertical rods 42, six insulating rods 43, and one horizontal rod 44. One horizontal rod 44 vertically connects to the three vertical rods 42. Below each vertical rod 42 are two vertical insulating rods 43, and the lower ends of the two insulating rods 43 are connected to a horizontal vertical switch blade 41. The length of the switch blade 41 is less than the length of the vertical rod 42. Each end of the vertical rod 42 has a cylindrical sleeve 421, which fits snugly onto the vertical guide rod 34. The suspension rope 52 is connected to the connection between the horizontal bar 44 and the middle vertical bar 42. The top vertical bar 35 is slightly closer to the central column 36 relative to the middle set of opposing vertical guide bars 34. The position of the first fixed pulley 51 installed below the top vertical bar 35 is adjusted so that the vertical rope segment 521 of the suspension rope 52 between the first fixed pulley 51 and the horizontal bar 44 is parallel to the vertical guide bar 34. Therefore, when the suspension rope 52 is pulled, the direction of the tension applied by the suspension rope 52 to the lifting frame 4 is parallel to the vertical guide bar 34, so the lifting frame 4 can move up and down more smoothly along the vertical guide bar 34 and is less likely to get stuck.

[0055] The inner terminal 22 and the second terminal 61 have the same shape, both being upright square metal blocks with a smooth, curved top surface.

[0056] refer to Figure 6The three switch blades 41 are identical in shape. Each switch blade 41 includes two identical metal strips 411, two identical fasteners 412, and four identical springs 413. The metal strips 411 are rectangular and parallel to each other. Each fastener 412 is connected in series with one end of two metal strips 411.

[0057] refer to Figure 7 and Figure 8 The fastener 412 has a left-end protrusion 4121, a middle protrusion 4122, and a right-end protrusion 4123. The middle protrusion 4122 is located between two metal strips 411; the left-end protrusion 4121 and the right-end protrusion 4123 are located on opposite sides of the two metal strips 411; a spring 413 is installed between the left-end protrusion 4121 and the left metal strip 411, and a spring 413 is installed between the right-end protrusion 4123 and the right metal strip 411. A middle protrusion 4122 is fixedly connected to the lower end of each insulating rod 43. When the suspension rope 52 is pulled, causing the switch 41 to disengage from the inner terminal 22 and the second terminal 61, the springs 413 on both sides are of the same length. The springs 413 compress the metal strips 411, and the two metal strips 411 clamp the middle protrusion 4122, so that the distance between the two metal strips 411 is less than the width of the inner terminal 22 and the width of the second terminal 61, and the center line of the middle protrusion 4122 is aligned downward with the center line of the inner terminal 22 and the center line of the second terminal 61.

[0058] When the hoisting rope 52 is released and the switch 41 is lowered to engage the inner terminal 22 and the second terminal 61, since both the inner terminal 22 and the second terminal 61 have smooth, arc-shaped top surfaces, the two metal strips 411 abut against the smooth sides of the top surface of the inner terminal 22 and the smooth sides of the top surface of the second terminal 61. Under the overall gravity of the lifting frame 4, the two metal strips 411 slide downwards and spread apart, thereby clamping the inner terminal 22 and the second terminal 61 under the rebound force of the springs 413 on both sides. The alignment is accurate, and the clamping pressure of the two metal strips 411 on both sides of the inner terminal 22 is equal, and the clamping pressure of the two metal strips 411 on both sides of the second terminal 61 is equal, with good contact on both sides.

[0059] Even though the line has been disconnected by the vacuum circuit breaker when the switch 41 is opened or closed, an arc may still be generated due to capacitive current (for unloaded lines) or induced current (such as when a transformer is unloaded). Therefore, arc-extinguishing covers 414 can be installed at both ends of the switch 41 to confine the arc to a small space and extinguish it automatically. The arc-extinguishing cover 414 partially covers the ends of the two metal strips 411, and the upper part of the arc-extinguishing cover 414 covers the positions of the two metal strips 411 used to connect the inner terminal 22 or the second terminal 61. The insulating rod 43 passes through and fixes the upper part of the arc-extinguishing cover 414. The arc-extinguishing cover 414 is not connected to the two metal strips 411.

[0060] When inspecting the circuit using the pole-mounted circuit breaker described in this application, first disconnect the vacuum circuit breaker, then disconnect the switch 41 from the inner terminal 22 and the second terminal 61. Next, use a voltage detector to check for voltage and confirm that the equipment has no voltage. Finally, install the grounding wire and perform the corresponding inspection and maintenance on the circuit. After the maintenance is completed, first remove the grounding wire, then connect the switch 41 to the inner terminal 22 and the second terminal 61, and finally close the vacuum circuit breaker to restore power.

[0061] The pole-mounted circuit breaker of this application uses a lifting frame 4 to move up and down along the vertical guide rod 34 by pulling a hoisting rope 52. When it rises, the three switches 41 simultaneously disengage from the three sets of inner terminals 22 and the second terminal 61; when it falls, the three switches 41 simultaneously engage with the three sets of inner terminals 22 and the second terminal 61. The tension of the hoisting rope 52 on the lifting frame 4 is parallel to the direction of movement of the lifting frame 4, ensuring smooth movement of the lifting frame 4 and allowing the switches 41 to engage with the inner terminals 22 and the second terminal 61, completing the closing operation. Compared to the current multi-hinge torsion switch design, the vertically guided opening and closing design of the switches 41 in this application is more stable and less prone to deviation from the original trajectory, resulting in good contact after closing.

[0062] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pole-mounted circuit breaker, characterized in that, It includes a base (1), three disconnect poles (2), a support frame (3), a lifting frame (4), a drive unit (5), and three insulating supports (6). The three circuit breaker poles (2) and the support frame (3) are all fixed on the base (1); Each of the circuit breaking poles (2) has a first terminal (21), a vacuum circuit breaker and an inner terminal (22) that are electrically connected in sequence; each of the insulating posts (6) is equipped with a second terminal (61); The lifting frame (4) and the driving device (5) are mounted on the support frame (3); the support frame (3) has a plurality of parallel vertical guide rods (34); the lifting frame (4) has three knife gates (41). The drive device (5) can drive the lifting frame (4) to move along the vertical guide rod (34), and use the gravity of the lifting frame (4) to connect each of the switches (41) to an inner terminal (22) and a second terminal (61), or drive the switches (41) to disengage from the inner terminal (22) and the second terminal (61). The lifting frame (4) also has three vertical rods (42), several insulating rods (43) and horizontal rods (44). Each of the vertical rods (42) is slidably connected to the vertical guide rod (34) at both ends, and the horizontal rod (44) connects the three vertical rods (42); each of the vertical rods (42) is connected downward to a knife switch (41) through a plurality of insulating rods (43); the driving device (5) is connected to the vertical rods (42) and / or the horizontal rods (44). The support frame (3) also includes a top longitudinal rod (35) and a middle column (36); the top longitudinal rod (35) is fixed to two opposite top edge rods (31); the upper and lower ends of the middle column (36) are fixed to the top edge rods (31) and the base (1); the middle column (36) has a mounting hole (361) from top to bottom, a vertical sliding groove (362) and a limiting member (363). The drive device (5) includes two fixed pulleys (51), a suspension rope (52), a slider (53), and a handle (54). The first fixed pulley (51) is installed below the top vertical rod (35), and the second fixed pulley (51) is installed in the mounting hole (361). The front end of the suspension rope (52) passes around the two fixed pulleys (51) and connects to the connection between the middle vertical rod (42) and the horizontal rod (44). The six vertical guide rods (34) located on the front and rear sides are opposite each other in pairs; the top vertical rod (35) is offset relative to the middle pair of vertical guide rods (34) towards the central column (36), so that the vertical rope segment (521) of the suspension rope (52) between the first fixed pulley (51) and the horizontal bar (44) is parallel to the vertical guide rod (34). The rear section of the suspension rope (52) is fixed to the slider (53) and the handle (54), and the slider (53) is embedded in the vertical sliding groove (362); the handle (54) is pulled down and the handle (54) is wrapped around the lower part of the limiting member (363), and the handle (54) is released. The handle (54) is locked by the limiting member (363) and cannot move upward. The three switches (41) are all disengaged from the inner terminal (22) and the second terminal (61).

2. The pole-mounted circuit breaker according to claim 1, characterized in that, The support frame (3) has four top edge rods (31), four side posts (32), two side crossbars (33), and six vertical guide rods (34); the four top edge rods (31) form a rectangular top plane, the upper ends of the four side posts (32) are fixed to the four corners of the rectangle, and the lower ends of the four side posts (32) are fixed to the base (1); the upper ends of the three vertical guide rods (34) are fixed to the front top edge rods (31), and one side crossbar (33) connects to... The lower ends of the three vertical guide rods (34) are connected, and the two ends of the side crossbar (33) are fixed to the two side posts (32); the upper ends of the other three vertical guide rods (34) are fixed to the rear top side bar (31), and the other side crossbar (33) is connected to the lower ends of the three vertical guide rods (34), and the two ends of the side crossbar (33) are fixed to the other two side posts (32); the lifting frame (4) is adapted to slide and connect to the six vertical guide rods (34).

3. The pole-mounted circuit breaker according to claim 2, characterized in that, Each of the side crossbars (33) is located above the inner terminal (22) and the second terminal (61).

4. The pole-mounted circuit breaker according to claim 1, characterized in that, Each of the aforementioned guillotine (41) includes two metal bars (411), two fasteners (412), and several springs (413). Two metal strips (411) are parallel to each other, and each fastener (412) is connected in series at one end of the two metal strips (411); the fastener (412) has a left end protrusion (4121), a middle protrusion (4122) and a right end protrusion (4123); the middle protrusion (4122) is located between the two metal strips (411); the left end protrusion (4121) and the right end protrusion (4123) are located on both sides of the two metal strips (411); Both the inner terminal (22) and the second terminal (61) are in an upright position and have a smooth, arc-shaped top surface; At least one spring (413) is installed between the left end protrusion (4121) and the left side metal strip (411), and between the right end protrusion (4123) and the right side metal strip (411). When the switch (41) is disengaged from the inner terminal (22) and the second terminal (61), the spring (413) presses the metal strip (411), so that the distance between the two metal strips (411) is less than the width of the inner terminal (22) and the width of the second terminal (61).

5. The pole-mounted circuit breaker according to claim 4, characterized in that, The lifting frame (4) has six insulating rods (43), and each insulating rod (43) has a central protrusion (4122) fixed at its lower end.

6. The pole-mounted circuit breaker according to claim 5, characterized in that, The width of the inner terminal (22) is equal to the width of the second terminal (61); the two metal strips (411) are the same metal strip (411); the plurality of springs (413) are all the same springs (413); a spring (413) is installed between the left end protrusion (4121) and the metal strip (411), and a spring (413) is installed between the right end protrusion (4123) and the metal strip (411). When the switch (41) is disengaged from the inner terminal (22) and the second terminal (61), the lengths of the two springs (413) are the same, and the two metal strips (411) clamp the middle protrusion (4122). The middle line of the middle protrusion (4122) is aligned downward with the middle line of the inner terminal (22) and the middle line of the second terminal (61).

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