Environment-friendly gas insulated built-in electric isolation column on-break circuit breaker

Abstract

The application discloses an environmentally-friendly gas-insulated built-in electric isolation column upper circuit breaker, which comprises a circuit breaker case, a circuit breaker and an isolating switch are arranged in the circuit breaker case, wire inlet bushings and wire outlet bushings are arranged on the two sides of the circuit breaker case, wire inlet bushing conductive rods are fixedly arranged in the wire inlet bushings, wire outlet bushing conductive rods are fixedly arranged in the wire outlet bushings, the circuit breaker comprises a circuit breaker wire inlet end, the isolating switch comprises a slidable isolating movable contact, the circuit breaker wire inlet end and the wire inlet bushing are electrically connected through wire inlet conductive rods and conductive rings, the isolating movable contact is in contact with or separated from the wire outlet bushing conductive rods through sliding to realize the control of the isolating switch, the epoxy resin fixation, composite insulation and increased creepage distance are adopted in the structural design, the insulation performance of the primary part is improved, the insulation requirement can be met even in dry air with zero gauge pressure, the use of SF6 gas is avoided, and the application is healthy and environmentally-friendly.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to an environmentally friendly gas-insulated built-in electrically isolating post-connected circuit breaker. Background Technology

[0002] Pole-mounted circuit breakers are a type of outdoor high-voltage power distribution equipment widely used in power systems. They are mainly used to break and close load currents, overload currents, and short-circuit currents in power systems. They are suitable for protection and control in substations and industrial and mining enterprise power distribution systems, and are even more suitable for urban and rural power grid construction and renovation, as well as locations requiring frequent operation.

[0003] To ensure insulation levels while achieving miniaturization, common-enclosure pole-mounted switchgear typically uses SF6 gas at a certain pressure as an insulating medium. SF6 is a potent greenhouse gas, with a GWP value approximately 22,800 times that of carbon dioxide.

[0004] To ensure the safety of personnel during inspection and maintenance, pole-mounted switches are typically equipped with disconnecting switches to provide a clearly visible isolation point. However, the live parts of these external disconnecting switches are directly exposed to the air, making them susceptible to risks such as phase-to-phase short circuits and high-voltage grounding due to the complex outdoor environment with salt spray, dust, rain, and snow. Furthermore, while pole-mounted circuit breakers are now remotely controlled, disconnecting switches are mostly manually operated, requiring on-site maintenance. This is particularly problematic in remote mountainous areas, where the workload for maintenance is substantial. Summary of the Invention

[0005] The main objective of this invention is to provide an environmentally friendly gas-insulated built-in electrically isolated pole-mounted circuit breaker, which aims to solve existing technical problems.

[0006] To achieve the above objectives, the present invention provides an environmentally friendly gas-insulated built-in electrically disconnecting post-connected circuit breaker, including a circuit breaker housing, wherein the circuit breaker housing is provided with a circuit breaker and a disconnecting switch;

[0007] The circuit breaker housing is provided with an inlet bushing and an outlet bushing on both sides respectively. An inlet bushing conductive rod is fixedly sealed inside the inlet bushing, and an outlet bushing conductive rod is fixedly sealed inside the outlet bushing.

[0008] The circuit breaker includes a circuit breaker input terminal, and the disconnecting switch includes a slidable disconnecting moving contact;

[0009] The circuit breaker's incoming line terminal and the incoming line bushing are electrically connected through an incoming line conductive rod and a conductive ring. The isolating moving contact controls the isolating switch by sliding to contact or separate from the outgoing line bushing conductive rod.

[0010] Furthermore, the circuit breaker also includes a solid-sealed pole and a circuit breaker frame. The solid-sealed pole has a circuit breaker inlet terminal, a vacuum interrupter, and a circuit breaker outlet conductive rod solidified inside. The circuit breaker frame is provided with a circuit breaker main shaft. The circuit breaker main shaft is connected to one end of an insulating tie rod, and the other end of the insulating tie rod is connected to the moving end of the vacuum interrupter.

[0011] The disconnecting switch further includes an isolation mounting box and an isolation frame. The isolation frame is fixed to the circuit breaker frame, and a rotating isolation spindle is provided inside the isolation frame. The isolation spindle is connected to one end of an isolation crank arm, and the other end of the isolation crank arm is connected to an insulating slider through a connecting plate. The insulating slider is fixed to one end of the isolation moving contact. The isolation moving contact is in contact with one end of the isolation conductive base, and the other end of the isolation conductive base is fixedly installed on the conductive rod on the outgoing side of the circuit breaker. The isolation conductive base is sealed inside the isolation mounting box, and the isolation moving contact is slidably installed inside the isolation mounting box.

[0012] Furthermore, it also includes a mechanism cover, inside which is provided an isolation driven crank arm. The isolation driven crank arm is fixed to the isolation main shaft extending out of the circuit breaker housing. The isolation driven crank arm is rotatably connected to the isolation operation connecting plate by a pin. The isolation operation connecting plate is rotatably connected to the driving crank arm by a pin. The end of the driving crank arm is coaxially connected to a driven gear and an isolation operation shaft. The driven gear is meshed with the driving gear. The driving gear is engaged or disengaged from the disconnect switch opening and closing motor through a motor clutch.

[0013] Furthermore, an insulating cover is provided outside the incoming conductive rod, and a silicone insulating pad is provided between the insulating cover and the incoming terminal of the circuit breaker.

[0014] Furthermore, a current sensor is fixedly sealed inside the incoming bushing.

[0015] Furthermore, the conductive rod of the outgoing sleeve is equipped with a spring contact finger.

[0016] Furthermore, the isolating moving contact is in contact with one end of the isolating conductive base via the second spring contact finger.

[0017] Furthermore, one end of the isolation mounting box adopts a tapered design and is fitted into the outgoing sleeve.

[0018] Furthermore, the isolation spindle end is connected to an isolation switch limiting block, the isolation switch limiting block has a limiting groove, and the isolation frame has a protrusion that contacts the isolation switch limiting block.

[0019] Furthermore, both the inlet and outlet bushings feature an umbrella skirt design.

[0020] The beneficial effects of this invention are reflected in:

[0021] This invention improves the insulation performance of the primary components through structural designs such as epoxy resin encapsulation, composite insulation, and increased creepage distance, ensuring that insulation requirements are met even under zero gauge pressure in dry air (or nitrogen). It also avoids the use of SF6 gas, making it healthier and more environmentally friendly.

[0022] This invention integrates the disconnecting switch into the circuit breaker enclosure, ensuring that the disconnecting switch operates in a dry, clean, and stable environment. This avoids interference from complex outdoor environments, guarantees power supply reliability, and prevents economic losses caused by large-scale power outages.

[0023] The disconnecting switch of this invention is equipped with an electric disconnecting mechanism, which can be operated in both manual and electric modes, realizing the remote control opening and closing function of the disconnecting switch, improving the intelligence level of the power grid and improving operation and maintenance efficiency.

[0024] The present invention allows for the built-in current sensor in the inlet and outlet bushings. Its compact design reduces the size and weight of the pole-mounted switch, facilitating transportation and installation. At the same time, it can accurately collect line current values ​​and monitor current changes in real time, providing a basis for the measurement and protection functions of the FTU. Attached Figure Description

[0025] Figure 1 This is an isometric view of the present invention;

[0026] Figure 2 This is a cross-sectional view of the present invention (opening state);

[0027] Figure 3 This is a view of the present invention (closed state);

[0028] Figure 4 This is a partial view of the inlet conductive rod assembly of the present invention;

[0029] Figure 5 This is an isometric side view of the circuit breaker + isolation device of the present invention;

[0030] Figure 6 This is a partial cross-sectional view of the isolation mounting box of the present invention;

[0031] Figure 7 This is a schematic diagram of the installation of the operating mechanism of the present invention;

[0032] Figure 8 This is a schematic diagram of the disconnector switch operating mechanism of the present invention;

[0033] Figure 9 This is a schematic diagram of the clutch position of the motor in this invention (during electric operation);

[0034] Figure 10 This is a schematic diagram of the clutch position of the motor in this invention (during manual operation).

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Circuit breaker housing; 2. Mechanism cover; 3. Incoming bushing; 4. Circuit breaker opening / closing operating handle; 5. Isolation operating handle; 6. Energy storage handle; 7. Outgoing bushing; 8. Isolation spindle; 9. Isolation crank arm; 10. Isolation frame; 11. Circuit breaker frame; 12. Circuit breaker spindle; 13. Solid-sealed pole; 14. Insulating tie rod; 15. Conductive ring; 16. Incoming bushing conductive rod; 17. Current sensor; 18. Outgoing bushing conductive rod; 19. Spring contact finger one; 20. Spring contact finger two; 21. Isolation moving contact; 22. Isolation... 23. Installation box; 24. Connecting plate; 25. Insulating slider; 26. Circuit breaker outgoing line conductive rod; 27. Vacuum interrupter; 28. Circuit breaker incoming line terminal; 29. ​​Silicone insulating pad; 30. Incoming line conductive rod; 31. Disconnecting switch limit block; 32. Disconnecting conductive base; 33. Disconnecting driven crank arm; 34. Circuit breaker operating mechanism; 35. Disconnecting operating connecting plate; 36. Driving crank arm; 37. Driven gear; 38. Disconnecting operating shaft; 39. Disconnecting switch opening and closing motor; 40. Motor clutch; 41. Driving gear. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1-10 The present invention provides an environmentally friendly gas-insulated built-in electric isolating post-connected circuit breaker, including a circuit breaker housing 1, wherein the circuit breaker housing 1 is provided with a circuit breaker and an isolating switch;

[0039] The circuit breaker housing 1 is provided with an inlet bushing 3 and an outlet bushing 7 on both sides respectively. An inlet bushing conductive rod 16 is fixedly sealed inside the inlet bushing 3, and an outlet bushing conductive rod 18 is fixedly sealed inside the outlet bushing 7.

[0040] The circuit breaker includes a circuit breaker inlet terminal 27, and the disconnecting switch includes a sliding disconnecting contact 21;

[0041] The circuit breaker's incoming line terminal 27 is electrically connected to the incoming line bushing 3 via the incoming line conductive rod 30 and the conductive ring 15. The isolating moving contact 21 controls the circuit breaker by sliding to contact or separate from the outgoing line bushing conductive rod 18.

[0042] In this embodiment, the disconnecting switch is built into the circuit breaker chassis, ensuring that the disconnecting switch is in a dry, clean, and stable working environment, avoiding interference from complex outdoor environments, ensuring power supply reliability, and avoiding economic losses caused by large-scale power outages.

[0043] In one embodiment, the circuit breaker further includes a solid-sealed pole 13 and a circuit breaker frame 11. The solid-sealed pole 13 has a circuit breaker inlet terminal 27, a vacuum interrupter 26 and a circuit breaker outlet conductive rod 25 solid-sealed inside. The circuit breaker frame 11 is provided with a circuit breaker main shaft 12. The circuit breaker main shaft 12 is connected to one end of an insulating pull rod 14 and the other end of the insulating pull rod 14 is connected to the moving end of the vacuum interrupter 26.

[0044] The disconnecting switch also includes an isolation mounting box 22 and an isolation frame 10. Specifically, the isolation mounting box 22 is horizontally installed inside the circuit breaker housing 1 and is co-located with the incoming bushing 3. The isolation frame 10 is fixed to the circuit breaker frame 11, and a rotating isolation spindle 8 is provided inside the isolation frame 10. The isolation spindle 8 is connected to one end of the isolation crank arm 9, and the other end of the isolation crank arm 9 is connected to the insulating slider 24 through the connecting plate 23. The insulating slider 24 is fixed to one end of the isolation moving contact 21. The isolation moving contact 21 is in contact with one end of the isolation conductive seat 32. The other end of the isolation conductive seat 32 is fixedly installed on the conductive rod 25 on the outgoing side of the circuit breaker. The isolation conductive seat 32 is sealed inside the isolation mounting box 22, and the isolation moving contact 21 is slidably installed inside the isolation mounting box 22.

[0045] In this embodiment, the primary part of the circuit breaker is encapsulated in epoxy resin, and the epoxy resin isolation mounting box 22 separates the phases and the housing of the primary energized part of the disconnecting switch, forming composite insulation.

[0046] In one embodiment, the device further includes a mechanism cover 2, inside which is provided an isolation driven crank arm 33. The isolation driven crank arm 33 is fixed to the isolation main shaft 8 extending out of the circuit breaker housing 1. The isolation driven crank arm 33 is rotatably connected to the isolation operation connecting plate 35 by a pin. The isolation operation connecting plate 35 is rotatably connected to the driving crank arm 36 by a pin. The end of the driving crank arm 36 is coaxially connected to a driven gear 37 and an isolation operation shaft 38. The driven gear 37 is meshed with the driving gear 41. The driving gear 41 is engaged or disengaged from the disconnect switch opening and closing motor 39 through a motor clutch 40.

[0047] The mechanism cover 2 is also equipped with a circuit breaker operating mechanism 34.

[0048] This embodiment is configured to allow for both manual and electric operation, enabling remote control of the disconnector switch's opening and closing functions, thereby improving the intelligence level of the power grid and enhancing operation and maintenance efficiency.

[0049] In addition, the outer surface of the mechanism cover 2 is respectively provided with circuit breaker opening and closing operation handle 4, isolation operation handle 5 and energy storage handle 6.

[0050] In one embodiment, an insulating cover 29 is provided outside the incoming conductor rod 30, and a silicone insulating pad 28 is provided between the insulating cover 29 and the incoming terminal 27 of the circuit breaker.

[0051] This embodiment is configured in such a way that the withstand voltage level at the connection point is guaranteed, and the primary portion of the incoming line is entirely placed inside the incoming line sleeve 3, so that there are no obvious exposed points on the conductive part of the incoming line. Even when filled with zero gauge pressure dry air (or nitrogen), it can still meet the power frequency withstand voltage requirement of 42kV / min.

[0052] In one embodiment, a current sensor 17 is encapsulated inside the incoming bushing 3. This embodiment is configured such that when current flows through the primary circuit, the current sensor 17 senses a predetermined proportion of the secondary current, enabling line current acquisition. This, in conjunction with the FUT, facilitates the switch's protection and measurement functions. The compact design of the incoming bushing 3, housing the current sensor 17, reduces the size and weight of the pole-mounted switch, facilitating transportation and installation. Simultaneously, it allows for accurate acquisition of line current values ​​and real-time monitoring of current changes, providing a basis for the FTU's measurement and protection functions.

[0053] In one embodiment, a spring contact finger 19 is installed inside the outgoing sleeve conductive rod 18. The isolating moving contact 21 contacts one end of the isolating conductive base 32 via a second spring contact finger 20. This configuration in this embodiment can improve the buffering force when the isolating moving contact 21 contacts the outgoing sleeve conductive rod 18, avoiding excessive impact force. At the same time, it can provide additional reverse force when the isolating moving contact 21 separates from the outgoing sleeve conductive rod 18.

[0054] In one embodiment, one end of the isolation mounting box 22 is designed with a tapered opening and is fitted into the outgoing sleeve 7. This design in this embodiment further increases the insulation distance and improves the insulation effect.

[0055] In one embodiment, an isolating switch limiting block 31 is connected to the end of the isolating spindle 8. The isolating switch limiting block 31 has a limiting groove, and the isolating frame 10 has a protrusion that contacts the isolating switch limiting block 31. This configuration in this embodiment allows for a limited range of rotation of the isolating spindle 8, ensuring that the isolating switch has only two operating states and avoiding over-rotation.

[0056] In one embodiment, both the inlet bushing 3 and the outlet bushing 7 feature a skirt design. This design further increases the insulation distance and improves the insulation effect.

[0057] It should be noted that the incoming bushing conductive rod 16, conductive ring 15, incoming conductive rod 30, circuit breaker incoming terminal 27, vacuum interrupter 26, circuit breaker outgoing side conductive rod 25, isolating conductive base 32, spring contact finger one 19, spring contact finger two 20, and outgoing bushing conductive rod 18 are all made of T2 copper, forming the primary conductive main circuit. The insulating pull rod 14, isolating spindle 8, isolating crank arm 9, isolating mounting box 22, connecting plate 23, insulating slider 24, silicone insulating pad 28, and insulating cover 29 are all made of insulating material.

[0058] The specific operational procedures for this application are as follows:

[0059] The disconnector switch features both electric and manual operation modes: The disconnector switch opening and closing motor 39 is equipped with a motor clutch 40. In electric mode: when the disconnector switch opening and closing motor 39 is energized, the motor clutch 40 extends, driving the drive gear 41 to rotate. The drive gear 41 drives the driven gear 37 to rotate, thereby driving the drive crank arm 36 to rotate, realizing the electric opening and closing of the disconnector switch. In manual mode: when the motor is de-energized, the motor clutch 40 disengages from the drive gear 41. At this time, the disconnector operating shaft 38 is manually rotated to open / close the disconnector switch.

[0060] Power-on operation: Operate the isolating operating shaft 38 clockwise (or press the isolating closing button, the isolating switch opening / closing motor 39 drives the drive gear 41 counterclockwise, causing the isolating operating shaft 38 to rotate clockwise), causing the isolating main shaft 8 to rotate clockwise. The isolating crank arm 9 drives the isolating moving contact 21 to slide to the left until it is fully in contact with the spring contact finger 19 in the outgoing bushing 7. At this time, the isolating switch is closed. After confirming that the isolating switch is closed, operate the circuit breaker mechanism to drive the circuit breaker main shaft 12 to rotate clockwise, causing the insulating pull rod 14 to drive the moving end of the vacuum interrupter 26 to move downward, realizing the circuit breaker closing. At this time, the line is energized.

[0061] Power outage operation: Operate the circuit breaker mechanism to drive the circuit breaker main shaft 12 to rotate counterclockwise, causing the insulating pull rod 14 to drive the moving end of the vacuum interrupter 26 to move upward, thereby opening the circuit breaker. After confirming that the circuit breaker has been opened, operate the isolating operating shaft 38 to rotate counterclockwise (or press the isolating opening button, and the isolating switch opening and closing motor 39 drives the drive gear 41 to rotate clockwise, thereby driving the isolating operating shaft 38 to rotate counterclockwise), causing the isolating main shaft 8 to rotate counterclockwise. The isolating crank arm 9 drives the isolating moving contact 21 to slide to the right, thereby opening the isolating switch. At this time, the power outage operation of the line is completed.

[0062] It should be noted that if the embodiments of the present invention involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the figure. If the specific posture changes, the directional indicators will also change accordingly.

[0063] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, such a combination of technical solutions should be considered non-existent.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An environmentally friendly gas-insulated built-in electric isolating pole-mounted circuit breaker, characterized in that: Including circuit breaker box (1), the circuit breaker box (1) is equipped with circuit breaker and disconnecting switch inside; The circuit breaker box (1) is respectively provided with incoming line sleeve (3) and outgoing line sleeve (7) on both sides, the incoming line sleeve (3) is fixed with incoming line sleeve conductive rod (16) inside, the outgoing line sleeve (7) is fixed with outgoing line sleeve conductive rod (18) inside; The circuit breaker includes circuit breaker incoming line end (27), and the disconnecting switch includes slidable isolation moving contact (21); Wherein, the circuit breaker incoming line end (27) and incoming line sleeve (3) are electrically connected through incoming line conductive rod (30) and conductive ring (15), the isolation moving contact (21) is contacted or separated from the outgoing line sleeve conductive rod (18) through sliding, to realize the control of disconnecting switch; The circuit breaker further includes fixed pole (13) and circuit breaker frame (11), the fixed pole (13) is fixed with circuit breaker incoming line end (27), vacuum arc-extinguishing chamber (26) and circuit breaker outgoing side conductive rod (25) inside, the circuit breaker frame (11) is provided with circuit breaker main shaft (12), the circuit breaker main shaft (12) is connected with one end of insulating pull rod (14), the other end of insulating pull rod (14) is connected with the moving end of vacuum arc-extinguishing chamber (26); The disconnecting switch further includes isolation mounting box (22) and isolation frame (10), the isolation frame (10) is fixed on the circuit breaker frame (11), and the isolation frame (10) is provided with rotating isolation main shaft (8) inside, the isolation main shaft (8) is connected with one end of isolation crank arm (9), the other end of isolation crank arm (9) is connected with insulating sliding block (24) through connecting plate (23), the insulating sliding block (24) is fixed on one end of isolation moving contact (21), the isolation moving contact (21) is contacted with one end of isolation conductive seat (32), the other end of isolation conductive seat (32) is fixedly installed on the circuit breaker outgoing side conductive rod (25), the isolation conductive seat (32) is fixed in the isolation mounting box (22), and the isolation moving contact (21) is slidably installed in the isolation mounting box (22); Further including mechanism cover (2), the mechanism cover (2) is provided with isolation driven crank arm (33) inside, the isolation driven crank arm (33) is fixed with the isolation main shaft (8) extending out of the circuit breaker box (1), the isolation driven crank arm (33) is rotatably connected with isolation operation connecting plate (35) through a pin, the isolation operation connecting plate (35) is rotatably connected with driving crank arm (36) through a pin, the driving crank arm (36) is coaxially connected with driven gear (37) and isolation operation shaft (38) at the end, the driven gear (37) is meshingly connected with driving gear (41), and the driving gear (41) is engaged or separated from the disconnecting switch opening and closing motor (39) through motor clutch (40).

2. An environmentally friendly gas insulated live tank circuit breaker of claim 1, wherein: The incoming line conductive rod (30) is provided with insulating cover (29) outside, and the insulating cover (29) is provided with silica gel insulating pad (28) between the circuit breaker incoming line end (27).

3. An environmentally friendly gas insulated live tank circuit breaker of claim 1, wherein: The incoming line sleeve (3) is fixed with current sensor (17) inside.

4. An environmentally friendly gas insulated live tank circuit breaker of claim 1, wherein: The outgoing line sleeve conductive rod (18) is internally provided with a spring contact finger 1 (19).

5. An environmentally friendly gas insulated live tank circuit breaker for pole mounting according to claim 1, wherein: The isolation moving contact (21) is in contact with one end of an isolation conductive seat (32) through a spring contact finger 2 (20).

6. An environmentally friendly gas insulated live tank circuit breaker of claim 1, wherein: One end of the isolation mounting box (22) is designed to be closed and is sleeved into the outgoing line sleeve (7).

7. An environmentally friendly gas insulated live tank circuit breaker of claim 1, wherein: The isolation frame (10) is provided with a convex column in contact with the isolation switch limiting block (31).

8. An environmentally friendly gas insulated live tank circuit breaker of claim 1, wherein: The incoming line sleeve (3) and the outgoing line sleeve (7) are both provided with umbrella skirt designs on surfaces.

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