Solid-sealed polar pole, circuit breaker, and ring main unit

Abstract

The present disclosure provides a solid-sealed polar pole (100), a circuit breaker (200), and a ring main unit (300). The solid-sealed polar pole (100) comprises a polar pole body (1), a movable end shielding seat (2), and a static end shielding seat (3). The movable end shielding seat (2) is formed by metal casting, and the outer surface of the metal is covered with an insulating resin layer (12). The static end shielding seat (3) is formed by metal casting, and the outer surface of the metal is covered with an insulating resin layer (12). The insulating resin layers (12) of the polar pole body (1), the movable end shielding seat (2), and the static end shielding seat (3) are integrally poured to form a whole. In this way, insulating resin jointly covers the outer surfaces of the three parts, and the insulating resin is used as an insulating material, so that the polar pole body (1), the movable end shielding seat (2), and the static end shielding seat (3) can be tightly combined together by means of integrated pouring, so that the joints between the parts are coated with the insulating material, the insulation performance of the joints between the parts is improved, an additional insulating layer is further provided, and electrical isolation is performed on the whole of the solid-sealed polar pole (100), so that the overall insulation strength of the solid-sealed polar pole (100) is improved.

Description

Solid-sealed poles, circuit breakers and ring main units

[0001] This application claims priority to Chinese Patent Application No. 2024106901768, filed on May 30, 2024, and Chinese Patent Application No. 2024212218177, filed on May 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of ring main unit technology, and mainly to a solid-sealed pole, circuit breaker and ring main unit. Background Technology

[0003] In switchgear, SF6 gas is commonly used for insulation due to its excellent insulating and arc-extinguishing properties. However, as a greenhouse gas, SF6's use is detrimental to environmental development. Currently, dry air, which offers greater economic and environmental advantages, is also being used directly as the insulating gas. However, this often requires a larger insulation space in the switchgear, resulting in a larger switchgear volume. For smaller switchgear, especially medium- and high-voltage switchgear, space constraints make it difficult to meet the insulation requirements of switchgear using air as the insulating gas. Summary of the Invention

[0004] This disclosure provides a solid-sealed pole, circuit breaker, and ring network, which can more effectively improve the insulation performance of ring main units.

[0005] According to one aspect of this disclosure, a solid-sealed pole is provided, comprising a pole body, a vacuum interrupter chamber, and an insulating resin layer enclosing the vacuum interrupter chamber; a moving end shielding seat, formed by metal casting and with an insulating resin layer covering the outer surface of the metal; and a stationary end shielding seat, formed by metal casting and with an insulating resin layer covering the outer surface of the metal; wherein the pole body, the moving end shielding seat, and the stationary end shielding seat are integrally cast to form a whole.

[0006] According to another aspect of this disclosure, a circuit breaker is disclosed, including at least one solid-sealed pole as described in any of the above embodiments and an operating mechanism. A movable conductive rod connected to the operating mechanism is installed at a first end of the solid-sealed pole. The movable conductive rod is located in a cavity enclosed by a movable end shielding seat of the solid-sealed pole. The operating mechanism can drive the movable conductive rod to move. A stationary conductive rod is installed at a second end of the solid-sealed pole to cooperate with the movable conductive rod to realize the circuit breaker's connection or disconnection.

[0007] According to another aspect of the application, a ring main unit is disclosed, including a cabinet and a circuit breaker as described above disposed within the cabinet. This application discloses a solid-sealed pole, a circuit breaker, and a ring main unit. The solid-sealed pole includes a pole body, a moving-end shielding seat, and a stationary-end shielding seat. The moving-end shielding seat and the stationary-end shielding seat can respectively cover both ends of the pole body, thereby better isolating the electrical connection points of the pole body from the external environment and achieving a uniform electric field. Furthermore, the pole body, moving-end shield, and stationary-end shield are integrally cast with insulating resin to form a single unit. This insulating resin covers the outer surfaces of all three components. As an insulating material, the resin not only tightly bonds the pole body, moving-end shield, and stationary-end shield together through integral casting, but also ensures that all connections between components are covered with insulating material. This provides excellent electrical isolation for the solidified pole, reducing the risk of arcing and breakdown due to high voltage differences when used in switchgear. It also creates a uniform electric field, improving the overall insulation strength of the solidified pole. Since the circuit breaker pole is a key structure in the switchgear responsible for current transmission and distribution, the use of the solidified pole provided in this application can effectively improve the insulation performance of the ring main unit. Attached Figure Description

[0008] The above and / or additional aspects and features of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0009] Figure 1 is a schematic diagram of the structure of a ring main unit according to some embodiments of this application;

[0010] Figure 2 is a schematic diagram of the structure of a circuit breaker according to some embodiments of this application;

[0011] Figure 3 is a cross-sectional view of a solid-sealed electrode post according to some embodiments of this application;

[0012] Figure 4 is a magnified view of a portion of point A in Figure 3;

[0013] Figure 5 is one of the perspective views of a solid-sealed pole according to some embodiments of this application;

[0014] Figure 6 is a second perspective view of a solid-sealed pole according to some embodiments of this application;

[0015] Figure 7 is a third perspective view of a solid-sealed pole according to some embodiments of this application;

[0016] Figure 8 is a fourth perspective view of a solid-sealed pole according to some embodiments of this application;

[0017] Figure 9 is one of the perspective views of the moving end shielding base of some embodiments of this application;

[0018] Figure 10 is a second perspective view of the moving end shielding base of some embodiments of this application;

[0019] Figure 11 is one of the perspective views of the stationary end shielding base of some embodiments of this application;

[0020] Figure 12 is a second perspective view of a stationary shielding base according to some embodiments of this application.

[0021] Implementation of this disclosure

[0022] The embodiments of this application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0023] To improve power supply reliability and allow users to obtain power from two directions, the power grid is typically connected in a ring, also known as a ring network power supply system. This power supply method is simply called ring power supply. The high-voltage switchgear used in a ring network power supply system is generally referred to as a ring main unit.

[0024] Traditional ring main units typically use SF6 gas insulation. While SF6 gas has excellent insulation and arc-quenching properties, it is a strong greenhouse gas, which is detrimental to environmental protection. Therefore, using air insulation in existing ring main units is more in line with the concept of green and environmentally friendly development.

[0025] The smaller the size of a ring main unit, the weaker its insulation. In particular, when designing miniaturized ring main units that use dry air as the insulating gas, it is necessary to maintain good insulation performance while reducing the size of the unit.

[0026] Therefore, for small-sized ring main units, especially medium- and high-voltage ring main units, it is necessary to further improve the insulation performance within the cabinet. In particular, since the circuit breaker terminals are key structures in the switchgear responsible for current transmission and distribution, poor insulation performance can lead to excessively high electric field strength, resulting in partial discharge or breakdown. This application improves the insulation performance of the ring main unit by optimizing the electric field design of the circuit breaker terminals.

[0027] As shown in Figures 1 and 2, this application discloses a ring main unit 300. A circuit breaker 200 is installed inside the cabinet 310 of the ring main unit 300. The circuit breaker 200 includes a fixed terminal 100 and an operating mechanism 210. The operating mechanism 210 realizes the connection and disconnection between the static conductive rod and the moving conductive rod 20 of the fixed terminal 100 through operation.

[0028] As shown in Figures 3 to 12, the two ends of the solid-sealed pole 100 are respectively a first end 101 and a second end 102. A conductive sleeve is provided on the first end 101, and the conductive sleeve has an opening for installing a moving conductive rod 20 connected to the operating mechanism 210. The moving conductive rod 20 is located inside the moving end shielding seat 2 of the solid-sealed pole 100. The operating mechanism 210 can be used to drive the moving conductive rod 20 of the solid-sealed pole 100 to move. A stationary conductive rod 230 is installed on the second end 102 of the solid-sealed pole 100 to connect and disconnect with the moving conductive rod 20. In this way, by operating the moving conductive rod 20 installed on the first end 101 of the solid-sealed pole 100 through the operating mechanism 210, the moving conductive rod 20 can be driven to move, thereby realizing the opening and closing functions of the circuit breaker 200.

[0029] For example, the operating mechanism 210 is a circuit breaker operating mechanism, which is connected to the moving conductive rod 20 in a transmission manner. The connection structure between the moving conductive rod 20 and the circuit breaker operating mechanism includes, but is not limited to, a conductive connector that fixes the moving conductive rod 20 to the first end 101 of the solid-sealed pole 100, a moving end crank arm that is connected to the moving conductive rod 20 in a transmission manner, and a transmission pin that passes through the moving end crank arm, etc.

[0030] Please refer to Figures 3 to 8. The solidified pole 100 includes a pole body 1, a moving end shield 2, and a stationary end shield 3.

[0031] The pole body 1 includes a vacuum interrupter 11 and an insulating resin layer 12 that surrounds the vacuum interrupter 11. The moving end shield 2 is formed by metal casting and the outer surface of the metal is covered with the insulating resin layer 12. The stationary end shield 3 is formed by metal casting and the outer surface of the metal is covered with a layer of insulating resin 12. The insulating resin layer 12 of the pole body 1, the moving end shield 2 and the stationary end shield 3 are formed into a whole by integral casting.

[0032] The design of the solidified pole 100 being integrally cast makes the contact between the pole body 1, the moving end shield 2, and the stationary end shield 3 more compact. Compared with setting the pole body 1, the moving end shield 2, and the stationary end shield 3 separately, the integral casting of these components with insulating resin can reduce the gaps or poor contact that may exist between the components, and enable the three to form a tight connection.

[0033] Among them, the insulating resin, as an insulating material, not only tightly binds the pole body 1, the moving end shielding seat 2, and the stationary end shielding seat 3 together by integral casting, but also provides an additional insulating resin layer 12, which provides electrical isolation for the whole composed of the pole body 1, the moving end shielding seat 2, and the stationary end shielding seat 3, reduces the risk of arcing and breakdown caused by high voltage difference when the solid-sealed pole 100 is used in switchgear, plays a more effective role in uniform electric field, and improves the insulation performance of the entire solid-sealed pole 100.

[0034] Optionally, epoxy resin may be used as the insulating resin.

[0035] As shown in Figures 2 and 3, the pole body 1 includes a cylinder 13 in which a vacuum interrupter 11 is formed, a silicone sleeve wrapped around the outer surface of the cylinder 13, and an insulating resin layer covering the outer surface of the silicone sleeve.

[0036] The electrode body 1 contains a vacuum interrupter 11, with its two ends designated as a first end and a second end. Further, as shown in Figure 2, the first end 101 and the second end 102 of the vacuum interrupter 11 correspond to the first end 101 and the second end 102 of the electrode body, respectively. In some specific embodiments, the first end 101 may refer to the upper end, and the second end 102 may refer to the lower end.

[0037] The second end 102 of the vacuum interrupter 11 is provided with a stationary end, and the second end 102 of the vacuum interrupter 11 is provided with a moving conductive rod 20. The moving conductive rod 20 provided in the vacuum interrupter 11 is used to drive the operating mechanism 210, thereby controlling the opening and closing engagement between the moving conductive rod 20 and the stationary conductive rod 230.

[0038] When the operating mechanism 210 drives the moving conductive rod 20 of the vacuum interrupter 11 to close, the operating mechanism 210 can drive the moving conductive rod 20 to move toward the stationary conductive rod 230 to close the moving conductive rod 20 and the stationary conductive rod 230, so that the power supply is connected to the load; when the operating mechanism 210 drives the pole body 1 to be in the open state, the moving conductive rod 20 and the stationary conductive rod 230 are separated.

[0039] The moving end shielding seat 2 is installed on the first end 101 of the vacuum interrupter 11, and the stationary end shielding seat 3 is installed on the second end 102 of the vacuum interrupter 11.

[0040] In this embodiment, a silicone sleeve 4 is nested on the outer surface of the cylindrical body 13 of the pole body 1, and insulating resin covers the silicone sleeve 4. Compared to directly casting the insulating resin and vacuum interrupter 11 together, which results in low bonding and easy bubble formation, this embodiment first coats the surface of the vacuum interrupter 11 with a silicone sleeve 4. Because the silicone sleeve 4 has a certain elasticity, it can be tightly connected to the vacuum interrupter 11. Simultaneously, after the insulating resin cures on the outer surface of the silicone sleeve, the silicone sleeve 4 and the insulating resin can bond more tightly, allowing the vacuum interrupter 11 to be more tightly encapsulated by the insulating resin, thus forming a multi-layered, tightly connected integrated structure, achieving a better electrical isolation effect.

[0041] Since the pole body 1 needs to be equipped with a moving end shielding seat 2 and a stationary end shielding seat 3 at both ends, a silicone sleeve is placed on the outer surface of the cylinder 13. However, the silicone sleeves at both ends of the cylinder 13 do not need to be covered with insulating resin, so that the moving end shielding seat 2 and the stationary end shielding seat 3 can be connected to the two ends of the cylinder 13 respectively.

[0042] As shown in Figure 2, the first end 101 of the pole body 1 is correspondingly set at the end where the moving conductive rod 20 of the vacuum interrupter 11 is located. A moving end shielding seat 2 is provided on the first end 101 of the pole body 1, so that the connection between the conductive rod of the vacuum interrupter 11 and the operating mechanism 210 can be installed in the moving end shielding seat 2.

[0043] As shown in Figure 4, the moving end shielding seat 2 is provided with a first shielding cavity 201. The connection between the first end 101 of the vacuum interrupter 11 and the operating mechanism 210 is covered by the first shielding cavity 201, which can electrically isolate the first end 101 of the vacuum interrupter 11 and reduce the influence of the electric field on the electric field of the adjacent phase.

[0044] As shown in Figures 9 and 10, the moving end shielding base 2 includes a first connecting plate 21 and three first shielding plates 22 extending upward from the first connecting plate 21. The first connecting plate 21 and the first shielding plates 22 together enclose a first shielding cavity 201. The first end 101 of the vacuum interrupter 11 is located within the first shielding cavity 201 and is used to connect to the operating mechanism 210 within the first shielding cavity 201.

[0045] The outer surface of the first shielding cavity 201, which is formed by the first connecting plate 21 and the first shielding plate 22, is covered with insulating resin, and the inner surface of the first shielding cavity 201 is a metal surface.

[0046] During the preparation of the solid-sealed pole 100, the outer surfaces of the first connecting plate 21 and the first shielding plate 22 are covered with insulating resin, which enhances the insulation performance of the moving end shielding seat 2 and is beneficial to the safe operation of the circuit breaker 200 under high voltage.

[0047] The inner surfaces of the first connecting plate 21 and the three first shielding plates 22 enclose a first shielding cavity 201, the inner surface of which is a metal surface. The first shielding cavity 201 provides sufficient space for the movement of the moving conductive rod 20 and the operating mechanism 210. The metal surface has good electrical conductivity and electromagnetic shielding effect.

[0048] Moreover, with the insulating resin cast into a single structure, the overall design of the moving end shielding seat 2 can more effectively provide electrical isolation to the first end 101 of the pole body, reduce the risk of the electric field spreading outward from the first end 101 of the pole body, and also reduce the interference of interphase electric field interference or other external electromagnetic fields on the moving conductive rod 20 in multiphase electrical equipment, thereby improving the insulation performance of the moving conductive rod 20 side of the vacuum interrupter 11.

[0049] More specifically, the first connecting plate 21 and the three first shielding plates 22 are configured to form four faces of a hexahedron, and the other two faces are configured as open faces. One of the open faces allows the transmission connection structure connecting the circuit breaker operating mechanism and the moving conductive rod 20 to extend into the first shielding cavity 201.

[0050] Furthermore, the moving end shield 2 is also provided with a connecting seat, which is located on one of the surfaces that are open for the moving conductive rod 20 to extend into, as shown in Figure 9. The connecting seat is provided with a second connecting hole 203 so that the transmission pin passing through the moving end crank arm can be connected to the moving end shield 2 through the second connecting hole 203.

[0051] The second connecting hole 203 has an upward-facing opening, allowing the drive pin to be placed on the connecting seat. The connector can fix the drive pin to the connecting seat through the second connecting hole 203, thus forming the rotation fulcrum of the moving end crank arm. This avoids opening a side hole on the pole body to connect the drive pin, further optimizing the electric field distribution at the connection between the first end 101 of the pole body and the moving conductive rod 20, thereby improving the insulation level of the first end 101 of the pole body. The first connecting plate 21 is connected to the first end 101 of the vacuum interrupter 11 by casting insulating resin.

[0052] The connection between the first connecting plate 21 and the vacuum interrupter 11 utilizes the excellent insulation properties and bonding strength of the insulating resin. The casting of the insulating resin enables the connection between the moving end shield 2 and the pole body 1 to be integrated, and improves the connection strength at the connection point between the two.

[0053] The first end 101 of the pole body 1 is provided with a moving end 250 configured to be connected to the operating mechanism 210. The moving end 250 extends into the vacuum interrupter 11 through the through hole 202 and can move up and down in the through hole 202.

[0054] The moving end 250 connected to the operating mechanism 210 can be configured as a moving conductive rod 20.

[0055] As shown in Figures 3 and 10, the first connecting plate 21 is positioned facing the first end 101. The first connecting plate 21 is provided with a through hole 202 communicating with the vacuum interrupter 11, so that the movable conductive rod 20 can extend into the vacuum interrupter 11 through the through hole 202 and move up and down in the through hole 202.

[0056] In detail, the moving end shielding seat 2 is connected to the vacuum interrupter 11 through a through hole 202 provided on the first connecting plate 21. The through hole 202 allows the moving conductive rod 20 to pass through. Under the drive of the operating mechanism 210, the moving conductive rod 20 can move up and down in the through hole 202, thereby enabling the closing and opening actions between the moving conductive rod 20 and the stationary conductive rod 230 in the vacuum interrupter 11 to be operated by driving the operating mechanism 210.

[0057] As shown in Figures 3 and 4, the first connecting plate 21 of the moving end shielding seat 2 protrudes a boss 23 toward the vacuum interrupter 11, and the boss 23 contacts the top surface of the silicone sleeve 4.

[0058] As shown in Figure 4, one end of the boss 23 is connected to the first connecting plate 21 of the moving end shielding seat 2. The other end of the boss 23 extends toward the vacuum interrupter 11 and abuts against the silicone sleeve 4. Thus, during the integral casting of the moving end shielding seat 2 and the pole body 1, the boss 23 can more effectively block the insulating resin from entering the vacuum interrupter 11 at the connection point between the first connecting plate 21 and the moving conductive rod 20 of the vacuum interrupter 11, preventing epoxy resin from seeping into the vacuum interrupter 11 through the connection point and curing, thereby affecting the movement of the conductive rod and reducing the flexibility of the moving conductive rod 20. The boss 23 reduces the problem of epoxy resin curing on the outside of the pole body 1, which could affect the operational performance of the sealed pole 100.

[0059] In detail, the boss 23 is located on the outside of the through hole 202 of the first connecting plate 21 to prevent insulating resin from seeping into the vacuum interrupter 11 through the through hole 202 and causing the moving conductive rod 20 to be stuck in the action process. This makes it easier for the moving conductive rod 20 in the moving end shielding seat 2 to open and close more smoothly under the control of the operating mechanism 210.

[0060] As shown in Figure 4, there are two bosses 23, which can provide a better barrier against the insulating resin. Of course, the technical solution of this application is not limited to the number of bosses; the number of bosses 23 can be designed according to actual needs.

[0061] The boss 23 can be integrally formed with the moving end shield 2 by metal casting.

[0062] As shown in Figures 6 and 7, the stationary end shielding seat 3 is located at the second end 102 of the pole body 1. Thus, the stationary end shielding seat 3 can directly cover and protect the stationary end of the vacuum interrupter 11 and its connection with the conductive component 240.

[0063] As shown in Figures 11 and 12, the stationary end shielding base 3 includes a second connecting plate 31 and two second shielding plates 32 extending downward from the second connecting plate 31. The second shielding plates 32 are disposed opposite each other on opposite sides of the second connecting plate 31, and the second connecting plate 31 and the second shielding plates 32 enclose a second shielding cavity 301, so that the connection between the stationary end of the vacuum interrupter 11 and the conductive element 240 is located within the second shielding cavity 301.

[0064] The conductive component 240 may include, but is not limited to, an isolating stationary contact, a connection between the stationary end shielding seat 3 and the stationary end of the vacuum interrupter 11, etc.

[0065] Adding a second shielding plate 32 to both sides of the conductive component 240 can form a physical barrier on the side of the second end 102 of the vacuum interrupter 11, thus providing electrical isolation.

[0066] Furthermore, both the inner and outer surfaces of the second shielding plate 32 are covered with insulating resin, and the inner surface of the second connecting plate 31 forming the second shielding cavity 301 is a metal surface.

[0067] The inner surfaces of the second shielding plate 32 and the second connecting plate 31 enclose the second shielding cavity 301. Since the second connecting plate 31 is used to connect to the second end 102 of the vacuum interrupter 11 as a conductive surface, the inner surface of the second connecting plate 31 is designed as a metal surface to facilitate the installation of the stationary end.

[0068] On the other hand, the inner and outer surfaces of the two second shielding plates 32 are covered with insulating resin, providing electrical isolation to the second end 102 of the vacuum interrupter 11. This not only reduces the risk of electric field diffusion outward from the conductive connection at the second end 102 of the vacuum interrupter 11, but also reduces interference from interphase electric field interference or other externally generated electromagnetic fields on the stationary end of the vacuum interrupter 11 in multiphase electrical equipment, thereby improving the insulation strength of the stationary end of the pole body 1.

[0069] Overall, the moving end shielding seat 2 is located at the first end 101 of the vacuum interrupter 11, providing electric field shielding at the connection between the moving conductive rod 20 of the vacuum interrupter 11 and the operating structure. The stationary end shielding seat 3 is located at the second end 102 of the vacuum interrupter 11, providing electrical isolation at the connection between the stationary end of the vacuum interrupter 11 and the conductive component 240. This effectively reduces interphase electric field interference or electromagnetic field interference from other external equipment in the conductive areas at both ends of the pole body 1, including the moving conductive rod 20 and the stationary end of the pole body 1, thus improving the insulation strength at both ends of the pole body 1. Furthermore, by casting the pole body 1, the moving end shielding seat 2, and the stationary end shielding seat 3 into a single structure using insulating resin, a tight connection can be formed between the three components, reducing the risk of arcing or electrical breakdown when current passes through the connection points between the components, thereby improving the overall insulation strength of the sealed pole 100.

[0070] The second connecting plate 31 is disposed toward the second end 102 of the vacuum interrupter chamber 11. The second connecting plate 31 is provided with a first connecting hole 302, which is used for the connecting member to pass through to lock the second connecting plate 31 and the second end 102.

[0071] As shown in Figure 3, the connector passes through the first connecting hole 302 and connects the second connecting plate 31 to the stationary end of the vacuum interrupter 11.

[0072] In some embodiments, the connector may be made of metal, such as screws or bolts, to enable current conduction.

[0073] As shown in Figures 3 and 5, a first insulating plate 5 protruding from the surface is provided on the surface of the pole body 1. The first insulating plate 5 is cast and connected to the pole body 1 as a whole. The first insulating plate 5 is located on the side of the pole body 1 used for connection with the operating mechanism 210, and the first insulating plate 5 is disposed between the moving end shielding seat 2 and the stationary end shielding seat 3.

[0074] The first insulating plate 5 protrudes from the surface of the pole body 1 and forms an integrated structure with the pole body 1 through the casting of insulating resin. This allows the first insulating plate 5 to be more firmly attached to the pole body 1, and the connection between the two is tighter and more reliable, making it less likely to fall off or shift.

[0075] Furthermore, the first insulating plate 5 is located on the side where the pole body 1 connects to the operating mechanism 210. The first insulating plate 5 is disposed between the moving end shielding seat 2 and the stationary end shielding seat 3. Considering the application scenario of the solidified pole 100 in the switchgear, the first insulating plate 5 is located between the high-voltage metal and the grounding metal position. This can increase the creepage distance and improve the creepage level of the solidified pole 100. This can reduce the risk that the insulating resin layer on the surface of the pole body 1 will be polarized and become charged, thereby improving the overall insulation performance of the solidified pole 100.

[0076] In some embodiments, two first insulating plates 5 are provided, and the two first insulating plates 5 are arranged opposite to each other, which further improves the creepage level and insulation performance of the surface of the solidified pole 100.

[0077] As shown in Figures 3, 6, and 7, a second insulating plate 6 and a third insulating plate 7 are also provided on the surface of the pole body 1. Both the second insulating plate 6 and the third insulating plate 7 are located on the side of the pole body 1 opposite to the first insulating plate 5. The second insulating plate 6 is correspondingly located at the end where the moving end shielding seat 2 is located, and the third insulating plate 7 is correspondingly located at the end of the stationary end shielding seat 3. Both the second insulating plate 6 and the third insulating plate 7 are integrally cast to the pole body 1 using insulating resin.

[0078] From the overall structure of the solidified electrode post 100, the electrode post body 1 is provided with a first insulating plate 5 on the side connected to the operating mechanism 210, and a second insulating plate 6 and a third insulating plate 7 on the side away from the operating mechanism 210, which can more comprehensively and effectively increase the creepage distance on the surface of the electrode post body 1.

[0079] From the positional layout of the second insulating plate 6 and the third insulating plate 7, since the moving end shielding seat 2 and the stationary end shielding seat 3 are the key parts for the connection between the pole body 1 and the external circuit, by setting insulating plates at these two positions, the creepage level of the pole body can be improved, and the insulation strength of the moving end shielding seat 2 and the stationary end shielding seat 3 side can be improved more effectively.

[0080] As shown in Figure 3, a fixing insert 8 is also provided on the pole body 1. The fixing insert 8 is used to connect with a fixing object to fix the pole body 1, thereby realizing the fixation of the pole body 1.

[0081] In some embodiments, the fixing insert 8 is connected to the cabinet 310 of the switch cabinet, so that the pole body 1 is fixed on the cabinet 310 of the switch cabinet.

[0082] The electrode body 1 and the fixing insert 8 are connected as one piece by casting insulating resin, which can make the fixing insert 8 and the electrode body 1 form a tight connection, avoid the fixing insert 8 from affecting the electric field uniformity of the solidified electrode 100, and further improve the overall insulation strength of the solidified electrode 100.

[0083] In some embodiments, please refer to Figure 5. Along the two ends of the pole body 1, the two sides of the fixing insert 8 are respectively provided with oppositely arranged first insulating plates 5. The arrangement of the first insulating plates 5 can further improve the insulation strength of the connection between the fixing insert 8 and the switch cabinet.

[0084] As shown in Figures 5 and 6, the fixing insert 8 is cylindrical in shape with a curved surface and a third connecting hole 801 formed inside. The third connecting hole 801 allows the connector to pass through so that the fixing insert 8 can be connected to the cabinet 310 of the switch cabinet.

[0085] Furthermore, the fixing insert 8 comprises three, and the positions of the three fixing inserts 8 form the three vertices of a triangle.

[0086] The three fixed inserts 8 form the three vertices of a triangle, thus creating a triangular lock. The triangular structure has good stability, and the triangular lock it forms further enhances the fixing effect between the solid-sealed pole 100 and the cabinet 310, preventing displacement or loosening during operation, making the solid-sealed pole 100 more suitable for high-voltage switchgear.

[0087] The triangle formed by the dotted lines in Figure 3 can be understood as the various fixed inserts 8 forming a triangular frame, which strengthens the connection with the cabinet 310.

[0088] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A sealed pole, comprising: a pole body comprising a vacuum interrupter and an insulating resin layer covering the vacuum interrupter; a moving end shield seat formed by metal casting and having a metal outer surface covered by an insulating resin layer; a static end shield seat formed by metal casting and having a metal outer surface covered by an insulating resin layer; the insulating resin layers of the pole body, the moving end shield seat and the static end shield seat are integrally formed by one-step casting.

2. The sealed pole according to claim 1, wherein the moving end shield seat is located at a first end of the pole body, the moving end shield seat comprises a first connecting plate and three first shield plates extending upwardly from the first connecting plate, the first connecting plate and the first shield plates together enclose a first shield cavity, a first end of the vacuum interrupter is located in the first shield cavity and is used to connect with an operating mechanism in the first shield cavity, wherein the outer surface of the first shield cavity enclosed by the first connecting plate and the first shield plates is covered by the insulating resin, and the inner surface of the first shield cavity is a metal surface.

3. The sealed pole according to claim 1, wherein the static end shield seat is located at a second end of the pole body, the static end shield seat comprises a second connecting plate and two second shield plates extending downwardly from the second connecting plate, the second shield plates are oppositely arranged on opposite sides of the second connecting plate, the second connecting plate and the second shield plates enclose a second shield cavity, a second end of the vacuum interrupter and a connection of a conductive part are located in the second shield cavity, the inner surface and the outer surface of the second shield plates are covered by the insulating resin, and the inner surface of the second shield cavity formed by the second connecting plate is a metal surface.

4. The sealed pole according to claim 2, wherein the first connecting plate and the first end of the pole body are connected by the insulating resin casting; the first connecting plate is arranged towards the first end, the first connecting plate is provided with a through hole in communication with the vacuum interrupter, the first end of the pole body is provided with a moving end configured to connect with an operating mechanism, and the moving end extends into the vacuum interrupter through the through hole and can move up and down in the through hole.

5. The sealed pole according to claim 3, wherein the second connecting plate is arranged towards the second end of the vacuum interrupter, the second connecting plate is provided with a first connecting hole for a connecting part to pass through to lock the second connecting plate and the second end.

6. The sealed pole according to any one of claims 1 to 5, wherein the pole body comprises a cylinder forming the vacuum interrupter, a silica gel sleeve covering an outer surface of the cylinder, and the insulating resin layer covering an outer surface of the silica gel sleeve.

7. The sealed pole according to claim 6, wherein the first connecting plate of the moving end shield seat protrudes a boss in the direction of the vacuum interrupter, and the boss is in contact with a top surface of the silica gel sleeve.

8. The sealed pole according to any one of claims 1 to 5, wherein The surface of the pole body is provided with a first insulation plate protruding from the surface, the first insulation plate is integrally connected with the pole body by the insulation resin, the first insulation plate is located on the side of the pole body configured to be connected with the operating mechanism, and the first insulation plate is arranged between the moving end shield seat and the static end shield seat.

9. The deadfront pole, of claim 8, wherein, Further comprising: A second insulation plate and a third insulation plate, the second insulation plate and the third insulation plate are both located on the side of the pole body away from the first insulation plate, the second insulation plate is correspondingly arranged on the end where the moving end shield seat is located, the third insulation plate is correspondingly arranged on the end where the static end shield seat is located, and the second insulation plate and the third insulation plate are both integrally connected with the pole body by the insulation resin.

10. The solid-sealed pole according to any one of claims 1 to 5, wherein The pole body is further provided with a fixing insert configured to fix the pole body, and the pole body and the fixing insert are integrally connected by the insulation resin.

11. The solid-sealed pole according to claim 10, wherein The fixing insert includes three, and the positions of the three fixing inserts constitute three vertices of a triangle.

12. A circuit breaker comprising the solid-sealed pole according to any one of claims 1 to 11 and an operating mechanism, a first end of the solid-sealed pole is provided with a moving conducting rod connected with the operating mechanism, the moving conducting rod is located in a cavity surrounded by the moving end shield seat of the solid-sealed pole, the operating mechanism drives the moving conducting rod to act, and a second end of the solid-sealed pole is provided with a static conducting rod matched with the moving conducting rod to realize the on or off of the circuit breaker.

13. A ring network cabinet comprising a cabinet body and the circuit breaker according to claim 12 arranged in the cabinet body.

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