Solid-sealed polar pole with built-in double-break isolating switch, circuit breaker and switch equipment

Abstract

The invention belongs to the field of switch equipment, and particularly relates to a solid-sealed polar pole with a built-in double-break isolating switch, a circuit breaker and switch equipment. The solid-sealed polar pole with the built-in isolating switch comprises an insulating pouring body provided with a containing cavity, a vacuum arc-extinguishing chamber, a transition conductive part and a wire outlet end conductive part are fixedly connected to the insulating pouring body, the movable end of the vacuum arc-extinguishing chamber is movably connected with the transition conductive part, and the transition conductive part and the wire outlet end conductive part are connected and disconnected through ascending and descending of an isolating knife in the containing cavity. The transition conductive piece and the wire outlet end conductive piece are arranged on the two sides of the containing cavity in parallel and opposite modes, the isolation knife is parallel to the axis of the transition conductive piece and the axis of the wire outlet end conductive piece, and the isolation knife is provided with a switching-on position which is in conduction contact with the transition conductive piece and the wire outlet end conductive piece at the same time and a switching-off position which is separated from the transition conductive piece and the wire outlet end conductive piece at the same time. And when the isolation knife is in the opening position, a gap exists between the isolation knife and the inner wall of the accommodating cavity. The circuit breaker and the switch equipment both comprise solid-sealed polar poles.

Description

Technical Field

[0001] This invention belongs to the field of switchgear, and in particular relates to solid-sealed poles, circuit breakers and switchgear with built-in double-break disconnectors. Background Technology

[0002] To facilitate safe maintenance of circuit breakers, existing circuit breakers typically have a separate isolating switch installed on the outside of the solid-sealed poles to isolate the circuit during maintenance. However, this external isolating switch requires a large installation space and has many components, resulting in a larger overall size and more complex structure for the circuit breaker. It also increases the workload for workers and reduces installation efficiency. Furthermore, during use, because the isolating switch is constantly exposed to the external environment, it has poor weather resistance, is prone to corrosion, and is easily overheated, leading to switch failure. This can cause the isolating switch to bounce or fail to close properly, posing a significant safety hazard to power line operation.

[0003] To address the aforementioned issues, existing technologies have introduced solid-encapsulated poles with built-in disconnect switches. For example, Chinese invention patent application CN118588488A discloses a solid-encapsulated pole for integrating a disconnect switch in a transformer power supply. This solid-encapsulated pole includes a vacuum interrupter, a bridge copper busbar, a flexible connector, an interrupter insulating rod, a moving contact fixing seat, a moving contact, a stationary contact fixing seat, a stationary contact, an isolating blade, and an isolating blade insulating rod. The interrupter insulating rod is connected to the moving end of the vacuum interrupter, and one end of the flexible connector is pressed between the insulating rod and the moving end of the vacuum interrupter. The other end of the flexible connector is connected to the bridge copper busbar, which is connected to the moving contact fixing seat. The moving contact is fixed to the moving contact fixing seat, and the isolating blade is movably inserted into the moving contact. By pulling the insulating rod up and down, the moving end of the vacuum interrupter is opened and closed with the stationary end of the vacuum interrupter, thereby realizing the load breaking function of the ordinary external solid-sealed pole; by pulling the insulating rod of the isolating knife up and down, the isolating knife slides up and down in the moving contact, thereby realizing the opening and closing of the isolating knife and the stationary contact, and thus realizing the conduction and disconnection between the moving contact and the stationary contact of the disconnecting switch.

[0004] The problems with the aforementioned built-in disconnector type solid-sealed pole are as follows: First, the disconnector is always connected to the moving end of the vacuum interrupter through the copper busbar and flexible connection. The disconnector relies solely on the break between the top of the disconnector and the stationary contact to achieve the isolation effect, resulting in low reliability of the isolation. Second, when the circuit breaker is closed and the disconnector is open, the disconnector moves downward under the action of the disconnector insulating rod. However, the height of the solid-sealed pole is limited, resulting in a short distance between the bottom of the disconnector and the mechanism box that operates the disconnector insulating rod. This leads to a concentrated electric field near the mechanism box, which may pose safety hazards such as partial discharge. Summary of the Invention

[0005] The purpose of this invention is to provide a solid-sealed pole with a built-in double-break disconnector to solve the technical problem of poor safety of existing solid-sealed poles with built-in disconnectors. Another purpose of this invention is to provide a circuit breaker and switching device to solve the same technical problem.

[0006] To achieve the above objectives, the technical solution of the solid-sealed pole of the built-in double-break disconnector provided by the present invention is as follows: The solid-sealed pole of the built-in double-break disconnector includes an insulating casting body with a receiving cavity. A vacuum interrupter, a transition conductor, and an outgoing conductor are fixedly connected to the insulating casting body. The moving end of the vacuum interrupter is movably connected to the transition conductor. The transition conductor and the outgoing conductor are connected and disconnected by the raising and lowering of the isolating blade in the receiving cavity. The transition conductor and the outgoing conductor are arranged parallel and opposite to each other on both sides of the receiving cavity. The isolating blade is parallel to the axis of the transition conductor and the outgoing conductor. The isolating blade has a closed position that is in contact with both the transition conductor and the outgoing conductor and an open position that is separated from both the transition conductor and the outgoing conductor. When the isolating blade is in the open position, there is a gap between the isolating blade and the inner wall of the receiving cavity.

[0007] This invention is an improved invention, and its beneficial effects are as follows: By setting the isolating blade as an integral part that can be raised and lowered relative to the transition conductive element and the outgoing terminal conductive element, the isolating blade can simultaneously disconnect from both the transition conductive element and the outgoing terminal conductive element. This allows both ends of the isolating blade to form a double-break structure with both the transition conductive element and the outgoing terminal conductive element, thereby improving the isolation performance of the built-in isolating switch. At the same time, the isolating blade is simultaneously disconnected from both the transition conductive element and the outgoing terminal conductive element. Even if the vacuum interrupter is closed, the isolating blade is not energized. When the isolating switch is in the open state, it can effectively avoid the safety hazards caused by the energized isolating blade being too close to the mechanism box, thus achieving the effect of jointly improving the safety of the solid-sealed pole.

[0008] As a further improvement, the receiving cavity has a tapered guide structure from bottom to top, so that the gap between the isolation knife and the inner wall of the receiving cavity gradually increases as it moves downward.

[0009] As a further improvement, the receiving cavity includes a lower chamber and an upper chamber. The lower chamber has a conical guide structure, and the upper chamber is a cylindrical cavity with a diameter equal to the length of the isolation knife. The conical guide structure is composed of two outwardly expanding grooves extending outward from the cylindrical cavity.

[0010] As a further improvement, the top of the receiving cavity is wavy.

[0011] As a further improvement, claws are provided on the upper edges of the ends of the transition conductor and the outgoing conductor that are close to each other.

[0012] As a further improvement, a voltage equalization grid is connected to both the transition conductive element and the output conductive element, with the voltage equalization grid respectively located at the ends of the transition conductive element and the output conductive element that are close to each other.

[0013] As a further improvement, a power supply voltage sensor, a load side voltage sensor, and a current sensor are fixedly connected within the insulating casting body. The power supply voltage sensor is located on the incoming line side, the load side voltage sensor is located on the outgoing line side, and the current sensor is located between the two voltage sensors.

[0014] As a further improvement, a cylindrical shielding mesh coaxial with the vacuum interrupter is fixed to the insulating casting body, and the length of the shielding mesh is sufficient to completely cover the connection position between the moving end of the interrupter and the transition conductive component.

[0015] To achieve the above objectives, the technical solution for the circuit breaker provided by this invention is as follows: A circuit breaker includes a solid-sealed pole, which includes an insulating casting body with a receiving cavity. A vacuum interrupter, a transition conductor, and an outgoing conductor are fixedly connected to the insulating casting body. The moving end of the vacuum interrupter is movably connected to the transition conductor. The transition conductor and the outgoing conductor are switched on and off by the raising and lowering of an isolating blade within the receiving cavity. The transition conductor and the outgoing conductor are arranged parallel to and opposite to each other on both sides of the receiving cavity. The isolating blade is parallel to the axes of the transition conductor and the outgoing conductor. The isolating blade has a closed position that is in contact with both the transition conductor and the outgoing conductor simultaneously, and an open position that is separated from both the transition conductor and the outgoing conductor simultaneously. When the isolating blade is in the open position, there is a gap between the isolating blade and the inner wall of the receiving cavity.

[0016] This invention is an improved invention, and its beneficial effects are as follows: By setting the isolating blade as an integral part that can be raised and lowered relative to the transition conductor and the outgoing conductor, the isolating blade can simultaneously disconnect from both the transition conductor and the outgoing conductor. This allows the two ends of the isolating blade to form a double-break structure with both the transition conductor and the outgoing conductor, improving the isolation performance of the built-in isolating switch. At the same time, the isolating blade is disconnected from both the transition conductor and the outgoing conductor, so even if the vacuum interrupter is closed, the isolating blade is not energized. When the isolating switch is in the open state, it can effectively avoid the safety hazards caused by the energized isolating blade being too close to the mechanism box, thus achieving the effect of jointly improving the safety of the solid-sealed pole and improving the reliability of the circuit breaker.

[0017] As a further improvement, the receiving cavity has a tapered guide structure from bottom to top, so that the gap between the isolation knife and the inner wall of the receiving cavity gradually increases as it moves downward.

[0018] As a further improvement, the receiving cavity includes a lower chamber and an upper chamber. The lower chamber has a conical guide structure, and the upper chamber is a cylindrical cavity with a diameter equal to the length of the isolation knife. The conical guide structure is composed of two outwardly expanding grooves extending outward from the cylindrical cavity.

[0019] As a further improvement, the top of the receiving cavity is wavy.

[0020] As a further improvement, claws are provided on the upper edges of the ends of the transition conductor and the outgoing conductor that are close to each other.

[0021] As a further improvement, a voltage equalization grid is connected to both the transition conductive element and the output conductive element, with the voltage equalization grid respectively located at the ends of the transition conductive element and the output conductive element that are close to each other.

[0022] As a further improvement, a power supply voltage sensor, a load side voltage sensor, and a current sensor are fixedly connected within the insulating casting body. The power supply voltage sensor is located on the incoming line side, the load side voltage sensor is located on the outgoing line side, and the current sensor is located between the two voltage sensors.

[0023] As a further improvement, a cylindrical shielding mesh coaxial with the vacuum interrupter is fixed to the insulating casting body, and the length of the shielding mesh is sufficient to completely cover the connection position between the moving end of the interrupter and the transition conductive component.

[0024] To achieve the above objectives, the technical solution of the switching device provided by the present invention is as follows: A switching device includes a circuit breaker. The circuit breaker includes a solid-sealed pole, which includes an insulating casting body with a receiving cavity. A vacuum interrupter, a transition conductor, and an outgoing conductor are fixedly connected to the insulating casting body. The moving end of the vacuum interrupter is movably connected to the transition conductor. The transition conductor and the outgoing conductor are switched on and off by the raising and lowering of an isolating blade within the receiving cavity. The transition conductor and the outgoing conductor are arranged parallel to and opposite to each other on both sides of the receiving cavity. The isolating blade is parallel to the axis of the transition conductor and the outgoing conductor. The isolating blade has a closed position that is in contact with both the transition conductor and the outgoing conductor simultaneously, and an open position that is separated from both the transition conductor and the outgoing conductor simultaneously. When the isolating blade is in the open position, there is a gap between the isolating blade and the inner wall of the receiving cavity.

[0025] This invention is an improved invention, and its beneficial effects are as follows: By setting the isolating blade as an integral part that can be raised and lowered relative to the transition conductor and the outgoing conductor, the isolating blade can simultaneously disconnect from both the transition conductor and the outgoing conductor. This allows the two ends of the isolating blade to form a double-break structure with both the transition conductor and the outgoing conductor, improving the isolation performance of the built-in isolating switch. At the same time, the isolating blade is disconnected from both the transition conductor and the outgoing conductor, so even if the vacuum interrupter is closed, the isolating blade is not energized. When the isolating switch is in the open state, it can effectively avoid the safety hazards caused by the energized isolating blade being too close to the mechanism box, thus achieving the effect of jointly improving the safety of the solid-sealed pole and improving the reliability of the circuit breaker and switching equipment.

[0026] As a further improvement, the receiving cavity has a tapered guide structure from bottom to top, so that the gap between the isolation knife and the inner wall of the receiving cavity gradually increases as it moves downward.

[0027] As a further improvement, the receiving cavity includes a lower chamber and an upper chamber. The lower chamber has a conical guide structure, and the upper chamber is a cylindrical cavity with a diameter equal to the length of the isolation knife. The conical guide structure is composed of two outwardly expanding grooves extending outward from the cylindrical cavity.

[0028] As a further improvement, the top of the receiving cavity is wavy.

[0029] As a further improvement, claws are provided on the upper edges of the ends of the transition conductor and the outgoing conductor that are close to each other.

[0030] As a further improvement, a voltage equalization grid is connected to both the transition conductive element and the output conductive element, with the voltage equalization grid respectively located at the ends of the transition conductive element and the output conductive element that are close to each other.

[0031] As a further improvement, a power supply voltage sensor, a load side voltage sensor, and a current sensor are fixedly connected within the insulating casting body. The power supply voltage sensor is located on the incoming line side, the load side voltage sensor is located on the outgoing line side, and the current sensor is located between the two voltage sensors.

[0032] As a further improvement, a cylindrical shielding mesh coaxial with the vacuum interrupter is fixed to the insulating casting body, and the length of the shielding mesh is sufficient to completely cover the connection position between the moving end of the interrupter and the transition conductive component. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the closed state of the isolation switch in an embodiment of the solid-sealed pole of the built-in double-break isolation switch of the present invention. Figure 2 This is a schematic diagram of the disconnector switch in the open state of an embodiment of the solid-sealed pole of the built-in double-break disconnector switch of the present invention. Figure 3 for Figure 1 A partial sectional view of the closed position of the central isolator switch; Figure 4 for Figure 2 A partial top view of the disconnected position of the central isolator switch.

[0034] Explanation of reference numerals in the attached figures: 1. Incoming terminal; 2. Insulating casting body; 2-1. Upper chamber; 2-2. Lower chamber; 2-3. Conical guide groove; 3. Vacuum interrupter; 4. Power supply side voltage sensor lead wire; 5. Cylindrical metal shielding mesh; 6. Flexible connection; 7. Power supply side voltage sensor; 8. Power supply side voltage sensor lead wire; 9. Interrupter chamber insulating pull rod; 10. Support rod; 11. Current sensor lead wire; 12. Current sensor; 13. Circular metal shielding mesh; 14. Transition end equalizing mesh; 15. Transition conductive element; 16. Isolation knife insulating pull rod; 17. Isolation knife; 18. Load side voltage sensor lead wire; 19. Load side voltage sensor; 20. Outgoing end equalizing mesh; 21. Load side voltage sensor inlet wire; 22. Outgoing end conductive element; 23. Outgoing terminal; 24. Elastic contact finger. Detailed Implementation

[0035] To address the existing technical problems, the basic technical concept of this invention is as follows: based on the integration of a direct-acting disconnecting switch within a solid-sealed pole, when the disconnecting switch is opened, a break is formed between one end of the disconnecting blade and the output end of the solid-sealed pole, and a break is formed between the other end of the disconnecting blade and the transition conductive element led out from the moving end of the arc-extinguishing chamber. By increasing the number of breaks, the power to the disconnecting blade is simultaneously de-energized, thereby jointly improving the safety of the solid-sealed pole with the built-in disconnecting switch.

[0036] The present invention will be further described in detail below with reference to the embodiments.

[0037] Specific embodiments of the solid-sealed pole of the built-in double-break disconnect switch provided by the present invention: like Figure 1 and Figure 2 As shown, the solid-sealed pole of the built-in double-break disconnector includes an insulating casting body 2. A vacuum interrupter 3, a power supply voltage sensor 7, a power supply voltage sensor lead-in wire 4, a power supply voltage sensor lead-out wire 8, a current sensor 12, a support rod 10 for the current sensor 12, a transition conductor 15, a load-side voltage sensor 19, a load-side voltage sensor lead-in wire 21, a load-side voltage sensor lead-out wire 18, and an output conductor 22 are cast onto the insulating casting body 2. The A-side of the solid-sealed pole is flat to allow the transition conductor 15 to be cast within the insulating casting body 2.

[0038] The stationary end of the vacuum interrupter 3 extends out of the insulating casting body 2 and is connected to the inlet terminal 1, which constitutes the inlet end of the solidified pole. One end of the outlet conductive element 22 extends out of the insulating casting body 2 and is connected to the outlet terminal 23, which constitutes the outlet end of the solidified pole. The moving end of the vacuum interrupter 3 is connected to the transition conductive element 15 via a flexible connection 6. The portion of the insulating casting body 2 located below the vacuum interrupter 3 is provided with a cavity for accommodating the arc-extinguishing chamber insulating rod 9, namely the arc-extinguishing chamber rod accommodating cavity. The arc-extinguishing chamber insulating rod 9 in the arc-extinguishing chamber rod accommodating cavity is connected to the moving end of the vacuum interrupter 3 and can move up and down along the arc-extinguishing chamber rod accommodating cavity to drive the moving contact and stationary contact of the vacuum interrupter 3 to conduct and disconnect.

[0039] In addition, the portion of the insulating casting body 2 between the transition conductive member 15 and the outgoing terminal conductive member 22 is provided with a receiving cavity for accommodating the isolating blade 17 and the isolating blade insulating pull rod 16, i.e., the moving end receiving cavity of the isolating switch. The isolating blade 17 is connected to the top end of the isolating blade insulating pull rod 16, and the axial direction of the isolating blade 17 is perpendicular to the axial direction of the isolating blade insulating pull rod 16. The lower chamber 2-2 of the disconnector switch moving end receiving cavity extends from the opening of the cavity to the bottom of the transition conductive member 15 and the outgoing conductive member 22. The lower chamber 2-2 has a tapered guide structure that gradually narrows from bottom to top. The isolation blade 17 is spaced apart from the cavity wall of the lower chamber 2-2. As the isolation blade 17 moves from bottom to top, the distance from both ends of the isolation blade 17 to the tapered guide structure gradually decreases, and the guidance of the isolation blade 17 gradually transitions from weak guidance to strong guidance until both ends of the isolation blade 17 contact the transition conductive member 15 and the outgoing conductive member 22, respectively. The part of the disconnector switch moving end receiving cavity above the transition conductive member 15 and the outgoing conductive member 22 constitutes the upper chamber 2-1. The upper chamber 2-1 is cylindrical, and its diameter is equal to the length of the isolation blade 17. To ensure the insulation performance between the transition conductor 15 and the output conductor 22, the top wall of the upper chamber 2-1 is corrugated. The corrugation can increase the creepage distance from the end of the transition conductor 15 to the end of the output conductor 22, so as to prevent mis-conduction between the end of the transition conductor 15 and the output conductor 22 when the voltage is too high.

[0040] Compared with existing technologies, when the disconnecting switch is in the open state ( Figure 2Compared to single-break isolating blades, the isolating blade 17 has isolation breaks between itself and the transition conductor 15, as well as the outgoing conductor 22. This provides the isolating switch with double-sided isolation, resulting in higher reliability. Furthermore, the isolating blade 17 is de-energized, improving the insulation performance of the isolating switch and preventing safety hazards caused by its proximity to the mechanism box when the switch is opened, thus enhancing the safety of the solid-sealed pole. Compared to existing rotary double-break solid-sealed poles, the solid-sealed pole has an "L"-shaped conductive main circuit, resulting in a more aesthetically pleasing and rational design. With the same pole height, the breaks between the isolating blade 17 and the transition conductor 15, and between the isolating blade 17 and the outgoing conductor 22, are larger, leading to better insulation performance between the isolating switch and the solid-sealed pole. Moreover, the solid-sealed pole has high integration, a more compact and reliable overall structure, and a larger insulation margin.

[0041] In other embodiments, the moving end receiving cavity of the disconnecting switch can also be cylindrical or conical. In this case, the isolating blade 17 should be spaced apart from the cavity wall of the moving end receiving cavity of the disconnecting switch. The ends of the transition conductive member 15 and the output conductive member 22 that are close to each other are inserted into the moving end receiving cavity of the disconnecting switch, and the distance between the ends of the transition conductive member 15 and the output conductive member 22 that are close to each other is equal to the length of the isolating blade 17. When the moving stroke of the isolating blade 17 with the isolating blade insulating pull rod 16 is completed, both ends of the isolating blade 17 are exactly in contact with the ends of the transition conductive member 15 and the output conductive member 22 that are close to each other, at which point the disconnecting switch is closed; when the isolating blade 17 moves down with the isolating blade insulating pull rod 16 to separate from the transition conductive member 15 and the output conductive member 22, the disconnecting switch is opened. When the disconnecting switch is opened, isolation breaks are formed between the isolating blade 17 and the transition conductive member 15, and between the isolating blade 17 and the output conductive member 22.

[0042] Compared to directly setting the moving end receiving cavity of the disconnecting switch to a frustum or cylindrical shape, setting the moving end receiving cavity of the disconnecting switch to a combination of a lower chamber 2-2 with a conical guide structure and an upper chamber 2-1 with a cylindrical cavity can form a transition from weak to strong guidance for the disconnecting knife 17. The combined structure allows the transition conductive element 15 and the outgoing terminal conductive element 22 to not need to extend into the moving end receiving cavity of the disconnecting switch, which facilitates the installation of the disconnecting knife 17.

[0043] Preferably, such as Figure 4As shown, the conical guide structure consists of a conical guide groove 2-3 formed by the outward expansion of a cylindrical cavity, which extends downward to penetrate the insulating casting body 2. Compared to directly setting the lower cavity 2-2 as a frustum-shaped cavity, setting the lower cavity 2-2 as a combination of a cylindrical cavity and a conical guide groove 2-3 can save more space and help reduce the volume of the solidified pole. At the same time, the extension direction of the conical guide groove 2-3 is consistent with the length direction of the isolating knife 17, which not only facilitates the determination of the interface position of the transition conductive element 15 and the outgoing terminal conductive element 22, but also allows the guide to gradually increase from weak to strong, which facilitates the installation of the isolating knife 17. In addition, in terms of insulation, the arc-shaped part of the cylindrical cavity can also increase the creepage distance, which helps to further improve the insulation performance of the isolating switch.

[0044] Based on the above implementation methods, such as Figures 1-3 As shown, the upper edge of the end of the transition conductor 15 and the output conductor 22 that are close to each other is provided with a claw. The claw is inserted into the moving end receiving cavity of the disconnecting switch. The ends of the transition conductor 15 and the output conductor 22 are used to connect with the two ends of the disconnecting knife 17, and the claw is used to engage with the outer periphery of the disconnecting knife 17. When the disconnecting switch is closed, the claw can further increase the contact area between the disconnecting knife 17 and the transition conductor 15, and between the disconnecting knife 17 and the output conductor 22, thereby reducing the resistance and making the contact conduction during closing more reliable. Moreover, the claw can limit the upward movement of the disconnecting knife 17. When the disconnecting knife 17 moves from the open position to engage with the claw, the switch is closed, and the disconnecting knife 17 stops moving.

[0045] Based on the above implementation methods, such as Figures 1-3 As shown, a resilient contact finger 24 is fixedly connected to the side of the latch facing the isolating blade 17. The advantage of adding the resilient contact finger 24 is that it can be interference-fitted with the outer circumference of the isolating blade 17, improving the reliability of contact and conduction between the isolating blade 17 and the transition conductive element 15, and between the isolating blade 17 and the outgoing terminal conductive element 22, during closing. The isolating blade 17 can be moved up and down along the opening of the moving end receiving cavity of the disconnecting switch to the latch via the isolating blade insulating rod 16. When the isolating blade 17 moves upward with the isolating blade insulating rod 16 until both ends of the isolating blade 17 are respectively engaged in the latches of the transition conductive element 15 and the outgoing terminal conductive element 22, and the upper edge of the outer circumference of the isolating blade 17 is interference-fitted with the resilient contact finger 24 in the latch, the disconnecting switch is closed. When the isolating blade 17 moves downward with the isolating blade insulating rod 16 until it disengages from the resilient contact finger 24, the disconnecting switch is opened.

[0046] Preferably, the flexible connection 6 is L-shaped and connects the moving end of the arc-extinguishing chamber and the left end of the transition conductor 15. In the height direction of the solidified electrode post, the transition conductor 15 is positioned lower between the moving end of the vacuum arc-extinguishing chamber 3 and the top connector of the arc-extinguishing chamber insulating rod 9. The proximity of the transition conductor 15 to the arc-extinguishing chamber insulating rod 9 helps reduce the possibility of partial discharge between the transition conductor 15 and the vacuum arc-extinguishing chamber 3, further improving the safety of the solidified electrode post.

[0047] like Figure 1 and Figure 2 As shown, the power supply side voltage sensor 7 and the load side voltage sensor 19 are respectively installed near the inlet and outlet ends of the solid-sealed pole. The power supply side voltage sensor 7 is connected to the stationary end of the vacuum interrupter 3 via the power supply side voltage sensor lead-in line 4, and outputs the inlet side phase sequence voltage signal and zero sequence voltage signal via the power supply side voltage sensor lead-out line 8, to collect the three-phase phase voltage and zero sequence voltage signals on the power supply side during normal operation of the circuit breaker. The load side voltage sensor 19 is connected to the outlet end conductive element 22 via the load side voltage sensor lead-in line 21, and outputs the outlet side phase sequence voltage signal and zero sequence voltage signal via the load side voltage sensor lead-out line 18, to collect the load side three-phase phase voltage and zero sequence voltage signals during normal operation of the circuit breaker. The current sensor 12 is fixed inside the insulating casting body 2 by the support rod 10, and outputs the phase sequence current signal and zero sequence current signal via the current sensor lead-out line 11, to collect the three-phase phase current and zero sequence current signals of the circuit breaker during normal operation of the circuit breaker. By setting up current sensor 12, power supply side voltage sensor 7, and load side voltage sensor 19, deep integration of primary and secondary voltages is achieved, which can both clear short-circuit faults and ensure reliable fault location. Of course, in other embodiments, the load side voltage sensor 19, current sensor 12, and power supply side voltage sensor 7 may not be set up.

[0048] Preferably, when setting the power supply side voltage sensor 7, the load side voltage sensor 19, and the current sensor 12, such as Figure 1 and Figure 2 As shown, the current sensor 12 is located between the power supply side voltage sensor 7 and the load side voltage sensor 19, and is coaxially arranged around the transition conductor 15. The advantage of this arrangement is that separating the current sensor 12 from the load side voltage sensor 19 further prevents electric field concentration at the end of the isolation blade 17.

[0049] Based on the above-described embodiment, a cylindrical metal shielding mesh 5, coaxial with the guide sleeve of the vacuum interrupter 3, is cast into the portion of the insulating casting body 2 located above the guide sleeve of the vacuum interrupter 3 and below the top connector of the insulating tie rod 9 of the interrupter 3. This ensures that the electric field between the guide sleeve of the vacuum interrupter 3 and the top connector of the insulating tie rod 9 is completely shielded by the cylindrical metal shielding mesh 5, preventing high voltage from entering the solid-sealed pole and ensuring a uniform electric field distribution to prevent partial discharge. Specifically, the cylindrical metal shielding mesh 5 has perforations to avoid the transition conductive element 15. Before casting the solid-sealed pole, the cylindrical metal shielding mesh 5 can be directly welded to one end of the transition conductive element 15 connecting to the flexible connection 6, or it can be threaded onto one end of the transition conductive element 15 connecting to the flexible connection 6. The cylindrical metal shielding mesh 5 makes the electric field distribution inside the solid-sealed pole more uniform and increases the insulation margin of the solid-sealed pole.

[0050] Based on the above implementation method, before casting the solid-sealed electrode post, a circular metal shielding mesh 13 is first connected to the end of the transition conductive element 15 near the isolating blade 17. Due to the introduction of the current sensor 12, when the disconnecting switch is closed, the electric field at the connection between the isolating blade 17 and the isolating blade insulating rod 16 will be relatively concentrated. Through the action of the circular metal shielding mesh 13, the electric field distribution at the connection between the isolating blade 17 and the isolating blade insulating rod 16 can be made more uniform, thereby preventing partial discharge and improving the insulation capability of the solid-sealed electrode post. The circular metal shielding mesh 13 makes the electric field distribution inside the solid-sealed electrode post more uniform, and the insulation margin of the solid-sealed electrode post is large.

[0051] Based on the above implementation, to ensure the insulation performance between the transition conductive rod and the output conductive rod, a voltage equalization mesh is provided at the adjacent ends of the transition conductive member 15 and the output conductive member 22. The transition end voltage equalization mesh 14 is connected to the transition conductive member 15, and the output end voltage equalization mesh 20 is connected to the output conductive member 22. Both the transition end voltage equalization mesh 14 and the output end voltage equalization mesh 20 are located to the right of the current sensor 12. A portion of both the transition end voltage equalization mesh 14 and the output end voltage equalization mesh 20 is cast inside the insulating casting body 2, while the other portion is directly exposed to the air. This ensures a uniform electric field between the charged bodies outside and inside the insulating casting body 2, avoiding electric field concentration outside the insulating casting body 2. The voltage equalization mesh 14 makes the electric field distribution inside the solid-sealed pole more uniform, resulting in a larger insulation margin for the solid-sealed pole.

[0052] In other embodiments, a voltage equalization mesh may be provided only on the end of the outgoing conductor 22 near the transition conductor 15, or a voltage equalization mesh may be provided only on the end of the transition conductor 15 near the outgoing conductor 22, or the voltage equalization mesh on the transition conductor 15 and the outgoing conductor rod may be omitted. The voltage equalization mesh is arranged coaxially with the outgoing conductor and is connected to the outgoing conductor by welding. Part of the voltage equalization mesh is cast inside the insulating casting body 2, and part of it is directly exposed to the air, ensuring that the electric field of the charged body outside the insulating casting body 2 is uniform with that of the charged body inside the insulating casting body 2, and avoiding the phenomenon of electric field concentration of the charged body outside the insulating casting body 2.

[0053] Of course, in other implementations, when the voltage level is not high, shielding and equalizing networks may not be required, as long as the insulation requirements are met.

[0054] In other embodiments, to improve insulation performance, the transition conductor 15 and the output conductor 22 are moved downwards to increase the distance between the moving end of the vacuum interrupter 3 and the current transformer. However, sufficient creepage distance between the transition conductor 15 and the output conductor 22 and the mechanism box must be ensured simultaneously. In this case, if the circuit breaker voltage is too high, the height of the solidified pole may need to be increased.

[0055] In other embodiments, the transition conductor 15 and the output conductor 22 may also be coaxial, but it should be ensured that the creepage distance from the transition conductor 15 and the output conductor 22 to the mechanism box is sufficient. In addition, it should be ensured that the isolation knife 17 can simultaneously contact and conduct with the transition conductor 15 and the output conductor 22.

[0056] Specific embodiments of the circuit breaker provided by this invention: A circuit breaker includes a solid-sealed pole. Specifically, the implementation of the solid-sealed pole is the solid-sealed pole described in any of the above-described implementations of the solid-sealed pole with a built-in double-break disconnector, and will not be repeated here.

[0057] Specific embodiments of the switching device provided by the present invention: A switching device includes a circuit breaker, the circuit breaker including a solid-sealed pole. Specifically, the embodiment of the solid-sealed pole is the solid-sealed pole described in any embodiment of the solid-sealed pole of the built-in double-break disconnector described above, and will not be repeated here.

[0058] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. 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. A solid-sealed pole with a built-in double-break disconnector includes an insulating casting body with a receiving cavity. A vacuum interrupter, a transition conductor, and an output conductor are fixedly connected to the insulating casting body. The moving end of the vacuum interrupter is movably connected to the transition conductor. The transition conductor and the output conductor are switched on and off by the raising and lowering of the disconnecting blade within the receiving cavity. The characteristic feature is that the transition... The conductive element and the output terminal conductive element are arranged parallel and opposite to each other on both sides of the receiving cavity. The isolating knife is parallel to the axis of the transition conductive element and the output terminal conductive element. The isolating knife has a closed position that is in contact with both the transition conductive element and the output terminal conductive element at the same time, and an open position that is separated from both the transition conductive element and the output terminal conductive element at the same time. When the isolating knife is in the open position, there is a gap between the isolating knife and the inner wall of the receiving cavity.

2. The solid-sealed pole of the built-in double-break disconnector according to claim 1, characterized in that, The receiving cavity has a tapered guide structure from bottom to top, so that the gap between the isolation knife and the inner wall of the receiving cavity gradually increases as it moves downward.

3. The solid-sealed pole of the built-in double-break disconnector according to claim 2, characterized in that, The accommodating cavity includes a lower chamber and an upper chamber. The lower chamber has a conical guide structure, and the upper chamber is a cylindrical cavity with a diameter equal to the length of the isolation blade. The conical guide structure consists of two outwardly expanding grooves extending from the cylindrical cavity.

4. The solid-sealed pole of the built-in double-break disconnector according to claim 3, characterized in that, The top of the cavity is wavy.

5. The solid-sealed pole of the built-in double-break disconnector according to any one of claims 1-4, characterized in that, Both the transition conductive element and the outgoing conductive element have claws on the upper edges of their adjacent ends.

6. The solid-sealed pole of the built-in double-break disconnector according to any one of claims 1-4, characterized in that the transition... Both the conductive component and the output conductive component are connected to an equalizing grid, which is set at the end of the transition conductive component and the output conductive component that are close to each other.

7. The solid-sealed pole of the built-in double-break disconnector according to any one of claims 1-4, characterized in that, The insulating casting body is fixedly connected to a power supply voltage sensor, a load side voltage sensor, and a current sensor. The power supply voltage sensor is located on the incoming line side, the load side voltage sensor is located on the outgoing line side, and the current sensor is located between the two voltage sensors.

8. The solid-sealed pole of the built-in double-break disconnector according to any one of claims 1-4, characterized in that, A cylindrical shielding mesh, coaxial with the vacuum interrupter, is fixedly attached to the insulating casting body. The length of the shielding mesh is sufficient to completely cover the connection position between the moving end of the interrupter and the transition conductive component.

9. A circuit breaker comprising a solid-sealed pole, characterized in that, The solid-sealed terminal is the solid-sealed terminal of the built-in double-break disconnect switch as described in any one of claims 1-8.

10. A switching device, comprising a circuit breaker, the circuit breaker including a solid-sealed pole, characterized in that, The solid-sealed terminal is the solid-sealed terminal of the built-in double-break disconnect switch as described in any one of claims 1-8.

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