Parallel capacitor for circuit breaker

Abstract

The utility model provides a kind of shunt capacitor for circuit breaker, it is related to shunt capacitor field, the scheme using is: including insulating cylinder, capacitor is arranged in the insulating cylinder, the both ends of the insulating cylinder are respectively provided with connecting piece, the connecting piece is U-shaped structure, the both ends of the connecting piece are respectively used to with the static end support and the dynamic end support of circuit breaker disassembly connection, the connecting piece adopts the conductive material with elasticity.The utility model can buffer vibration absorption, reduce the influence of external vibration on capacitor, improve the protection to capacitor.

Description

Technical Field

[0001] This utility model relates to the field of parallel capacitors, and in particular to a parallel capacitor for circuit breakers. Background Technology

[0002] To improve the breaking performance of high-voltage circuit breakers, especially their ability to break near-zone faults, capacitors are often connected in parallel between the breaks. When installed between the breaks of a double-break circuit breaker, the parallel capacitors also serve to equalize the voltage across the breaks. Therefore, parallel capacitors play a very important role in high-voltage switches.

[0003] In the prior art, Chinese invention patent application CN 104112585 A provides a novel parallel capacitor for an 800kV circuit breaker, comprising a fixing plate, a capacitor assembly, a fixing base, and a capacitor. Capacitor assemblies are mounted on both ends of the fixing plate, and the capacitor assemblies are connected to the fixing plate by bolts and washers. The ends of the two capacitor assemblies are connected through the fixing plate, and the ends of the capacitor assemblies are connected to the fixing plate by nuts and washers. Fixing bases are symmetrically mounted on both sides of the central axis of the fixing plate, and fixing bases are symmetrically mounted on the outer sides of the fixing plate at both ends of the capacitor assemblies. Each fixing base has two fixing holes. An insulating cylinder is mounted on the outer side of the capacitor assembly. One end of the capacitor assembly has a connector I-1, and the other end has a connector I-2. A capacitor is installed inside the capacitor assembly. A conductive spring is installed between the capacitor near connector I-2 and connector I-2, and a shielding gasket is installed between the conductive spring and the capacitor. This solution has a simple structure, is easy to use, and is safe and reliable.

[0004] However, when the above technical solution is adopted, the main function of the conductive spring inside the insulating cylinder is to maintain good electrical contact between multiple capacitors. It is always under a large degree of compression. The two ends of the insulating cylinder are rigidly connected to the corresponding fixing plates by bolts and nuts. When external vibration occurs, the above technical solution cannot effectively buffer and absorb vibration. The vibration will be transmitted to the capacitor through the bolts, connectors, or connectors, causing damage to the internal capacitors and affecting the reliability of the capacitor operation. Utility Model Content

[0005] To address the technical problem of poor energy absorption and capacitor damage caused by parallel capacitors in circuit breakers in the prior art, this invention provides a parallel capacitor for circuit breakers that can buffer and absorb vibration, reduce the impact of external vibrations on the capacitor, and improve capacitor protection.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a parallel capacitor for a circuit breaker, including an insulating cylinder, a capacitor disposed inside the insulating cylinder, and connectors disposed at both ends of the insulating cylinder. The connectors are U-shaped and are used to detachably connect to the stationary end support and the moving end support of the circuit breaker, respectively. The connectors are made of an elastic conductive material.

[0007] This invention achieves the installation of the insulating cylinder and the circuit breaker by setting a connector with an elastic U-shaped structure. Vibration energy is absorbed through the elastic deformation of the material itself. At the same time, the U-shaped structure allows the connector to produce uniform elastic deformation when under force, which has better vibration resistance performance compared with the prior art.

[0008] Furthermore, the connector includes two connecting parts, and a buffer part is provided between the two connecting parts. The buffer part has an arc-shaped structure, and the protruding direction of the buffer part is opposite to the opening direction of the connector.

[0009] This invention, by setting the buffer part to an arc-shaped structure, increases the length of the buffer part, thereby increasing the buffering capacity of the connector. On the other hand, compared with a planar structure, the arc-shaped structure makes it easier for the connector to swing inward, improving the sensitivity of buffering energy absorption.

[0010] Furthermore, the connecting portion and the buffer portion are connected by a transition fillet.

[0011] This invention can avoid stress concentration in the connectors by setting transition fillets, thus extending the service life of the connectors.

[0012] Furthermore, the connecting part is provided with bolt holes, at least one of the bolt holes being a straight slot hole and its length direction being consistent with the length direction of the connecting part.

[0013] This invention compensates for manufacturing errors and assembly errors with the circuit breaker by providing straight slots in the bolt holes, thus facilitating assembly.

[0014] Furthermore, conductive bolt one and conductive bolt two are respectively provided in the two bolt holes. Conductive bolt one extends into the insulating cylinder and is electrically connected to the capacitor. Conductive bolt two is connected to the stationary end support or the moving end support of the circuit breaker through a nut.

[0015] Furthermore, end cap one and end cap two are screwed to both ends of the insulating cylinder, respectively. End cap one has a connector one inside, and a conductive spring is provided between connector one and the adjacent capacitor. Connector one is electrically connected to the connector at the corresponding end. End cap two has a connector two inside, one end of connector two abuts against the adjacent capacitor, and the other end of connector two is electrically connected to the corresponding connector.

[0016] This invention ensures good contact between multiple capacitors and the capacitors and the connector by setting a conductive spring, thus guaranteeing the reliability of the operation.

[0017] Furthermore, a shielding pad is provided between the conductive spring and the adjacent capacitor.

[0018] This invention can effectively homogenize the electric field distribution and prevent local electric field concentration by setting shielding pads.

[0019] Furthermore, at least two connectors are provided at the end of the insulating cylinder, with adjacent connectors connected to each other and having opposite opening directions.

[0020] This invention further enhances the buffering capacity of the parallel capacitor and improves its protection by setting multiple connectors with opposite opening directions.

[0021] Furthermore, the multiple connectors are integrally bent structures.

[0022] This invention integrates multiple connectors into a single structure, which facilitates assembly and extends service life.

[0023] As can be seen from the above technical solutions, this utility model has the following advantages: This invention provides a parallel capacitor for circuit breakers. It achieves the installation of the insulating cylinder and circuit breaker through a U-shaped connector with an elastic structure. Vibration energy is absorbed through the elastic deformation of the material itself. Simultaneously, the U-shaped structure allows the connector to produce uniform elastic deformation under stress, resulting in better vibration resistance compared to existing technologies. By setting the buffer section as an arc shape, the length of the buffer section is increased, enhancing the buffering capacity of the connector. Furthermore, compared to a planar structure, the arc shape facilitates inward swinging of the connector, improving the sensitivity of energy absorption. The use of rounded transition corners avoids stress concentration in the connector, extending its service life. The straight slotted bolt holes compensate for manufacturing errors and assembly errors with the circuit breaker, facilitating assembly. The use of conductive springs ensures good contact between multiple capacitors and between the capacitors and the connector, guaranteeing operational reliability. The use of shielding gaskets effectively homogenizes the electric field distribution, preventing localized electric field concentration. The use of multiple connectors with opposite opening directions further enhances the vibration buffering capacity of this parallel capacitor, further improving its protection capabilities. Attached Figure Description

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

[0025] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0026] Figure 2 This is a schematic diagram of the assembly structure of the circuit breaker in Embodiment 1 of this utility model.

[0027] Figure 3 This is a schematic diagram of the connector structure in Embodiment 1 of this utility model. Figure 1 .

[0028] Figure 4 This is a schematic diagram of the connector structure in Embodiment 1 of this utility model. Figure 2 .

[0029] Figure 5 This is a schematic diagram of the connector structure in Embodiment 1 of this utility model. Figure 3 .

[0030] Figure 6 This is a schematic diagram of the connector in Embodiment 2 of this utility model.

[0031] In the diagram: 1. Conductive bolt 2; 2. Connector; 201. Connecting part; 202. Buffer part; 203. Bolt hole; 204. Transition fillet; 3. Insulating cylinder; 4. Capacitor; 5. Conductive spring; 6. End cap 1; 7. Conductive bolt 1; 8. End cap 2; 9. Connector 1; 10. Connector 2; 11. Shielding gasket; 12. Circuit breaker; 13. Moving end support; 14. Stationary end support. Detailed Implementation

[0032] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0033] Example 1 like Figures 1 to 3As shown, this embodiment provides a parallel capacitor for a circuit breaker, including an insulating cylinder 3. Multiple capacitors 4 connected in series are disposed within the insulating cylinder 3. Connectors 2 are respectively disposed at both ends of the insulating cylinder 3. The connectors 2 have a U-shaped structure and are used for detachable connection to the stationary end support 14 and the moving end support 13 of the circuit breaker 12, respectively. The connectors 2 are made of an elastic conductive material; they can be made of beryllium copper alloy or graphene-reinforced aluminum-based composite material. In this embodiment, one connector 2 is disposed at each end of the insulating cylinder 3.

[0034] In this embodiment, the connection and installation of the insulating cylinder 3 and the circuit breaker 12 are achieved by setting a connector 2 with an elastic U-shaped structure. Vibration energy is absorbed by the elastic deformation of the material itself. At the same time, the U-shaped structure makes it easier and more effective for the connector 2 to produce uniform elastic deformation when subjected to vibration. Compared with the prior art, it has better vibration resistance.

[0035] like Figure 3 As shown, in this embodiment, the connector 2 includes two connecting portions 201, and a buffer portion 202 is provided between the two connecting portions 201. The buffer portion 202 has an arc-shaped structure, and the protruding direction of the buffer portion 202 is opposite to the opening direction of the connector 2. This configuration increases the length of the buffer portion 202, thereby increasing the buffering capacity of the connector 2. Furthermore, compared with a planar structure, the arc-shaped structure makes it easier for the connecting portion 201 to swing inward, improving the sensitivity of buffering and energy absorption. Moreover, the connecting portion 201 and the buffer portion 202 are connected by a transition fillet 204. By setting the transition fillet 204, stress concentration in the connector 2 can be avoided, extending the service life of the connector 2.

[0036] like Figure 4 and Figure 5 As shown, in this embodiment, the connecting part 201 is provided with bolt holes 203. At least one of the bolt holes 203 is a straight slot hole and its length direction is consistent with the length direction of the connecting part 201. By providing the bolt hole 203 with a straight slot hole, manufacturing errors and assembly errors with the circuit breaker 12 can be compensated, which facilitates assembly. In this embodiment, the bolt hole 203 connected to the moving end support 13 or the stationary end support 14 of the circuit breaker 12 is a straight slot hole, and the other bolt hole 203 is a round hole. Conductive bolt 1 and conductive bolt 2 are respectively provided in the two bolt holes 203. Conductive bolt 1 extends into the insulating cylinder 3 and is electrically connected to the capacitor 4. Conductive bolt 2 is connected to the stationary end support 14 or the moving end support 13 of the circuit breaker 12 by a nut.

[0037] like Figure 1As shown, to ensure good electrical contact in this embodiment, end cap 6 and end cap 8 are screwed to both ends of the insulating cylinder 3, respectively. A connector 9 is provided inside end cap 6. A conductive spring 5 is provided between one end of connector 9 and the adjacent capacitor 4, and the other end of connector 9 is electrically connected to the corresponding connector 2. A connector 10 is provided inside end cap 8. One end of connector 10 abuts against the adjacent capacitor 4, and the other end of connector 10 is electrically connected to the corresponding connector 2. In this embodiment, connector 9 is screwed to the corresponding conductive bolt 7, and connector 10 is screwed to the corresponding conductive bolt 7. A shielding gasket 11 is provided between the conductive spring 5 and the adjacent capacitor 4. By providing the conductive spring 5, good contact can be ensured between the multiple capacitors 4 and between the capacitors 4 and connector 9, guaranteeing operational reliability.

[0038] Example 2 like Figure 6 As shown, this embodiment provides a parallel capacitor for a circuit breaker, whose structure is basically the same as that of Embodiment 1. The difference is that: at least two connecting pieces 2 are provided at the end of the insulating cylinder 3, and two adjacent connecting pieces 2 are connected to each other and have opposite opening directions. In this embodiment, two connecting pieces 2 are provided at each end of the insulating cylinder 3.

[0039] This embodiment can further enhance the buffering capacity of the parallel capacitor and further improve the protection of the capacitor 4 by setting multiple connectors 2 with opposite opening directions.

[0040] Preferably, the plurality of connectors 2 are bent into an integrated structure, which facilitates assembly and extends the service life of the connectors 2.

[0041] As can be seen from the above embodiments, the present invention has the following beneficial effects: 1. The installation of the insulating cylinder 3 and the circuit breaker 12 is achieved by setting a connector 2 with an elastic U-shaped structure. Vibration energy is absorbed by the elastic deformation of the material itself. At the same time, the U-shaped structure enables the connector 2 to produce uniform elastic deformation when subjected to force, which has better vibration resistance than the existing technology. 2. By setting the buffer part 202 as an arc-shaped structure, on the one hand, the length of the buffer part 202 is increased, which can increase the buffering capacity of the connector 2. On the other hand, compared with the planar structure, the arc-shaped structure makes it easier for the connector 201 to swing inward, thus improving the sensitivity of buffering energy absorption. 3. By setting a transition fillet, stress concentration in connector 2 can be avoided, thus extending the service life of connector 2; 4. By providing straight slots in the bolt holes 203, manufacturing errors and assembly errors with the circuit breaker 12 can be compensated, making assembly easier; 5. By setting the conductive spring 5, good contact can be formed between multiple capacitors 4 and between capacitor 4 and connector 9, ensuring the reliability of operation. 6. By setting up shielding pads, the electric field distribution can be effectively homogenized, preventing local electric field concentration; 7. By setting multiple connectors 2 with opposite opening directions, the vibration buffering capacity of this parallel capacitor can be further enhanced, and the protection capacity of capacitor 4 can be further improved.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A parallel capacitor for a circuit breaker, comprising an insulating cylinder (3), wherein a capacitor (4) is disposed within the insulating cylinder (3), characterized in that, The insulating cylinder (3) is provided with connectors (2) at both ends. The connectors (2) are U-shaped and are used to detach and connect with the stationary end support and the moving end support of the circuit breaker, respectively. The connectors (2) are made of elastic conductive material.

2. The parallel capacitor for a circuit breaker as described in claim 1, characterized in that, The connector (2) includes two connecting parts (201), and a buffer part (202) is provided between the two connecting parts (201). The buffer part (202) has an arc-shaped structure, and the protruding direction of the buffer part (202) is opposite to the opening direction of the connector (2).

3. The parallel capacitor for a circuit breaker as described in claim 2, characterized in that, The connecting part (201) and the buffer part (202) are connected by a transition fillet (204).

4. The parallel capacitor for a circuit breaker as described in claim 3, characterized in that, The connecting part (201) is provided with bolt holes (203), at least one of the bolt holes (203) is a straight slot hole and its length direction is consistent with the length direction of the connecting part (201).

5. The parallel capacitor for a circuit breaker as described in claim 4, characterized in that, Conductive bolt one (7) and conductive bolt two (1) are respectively provided in the two bolt holes (203). Conductive bolt one (7) extends into the insulating cylinder (3) and is electrically connected to the capacitor (4). Conductive bolt two (1) is connected to the stationary end support or the moving end support of the circuit breaker by a nut.

6. The parallel capacitor for a circuit breaker as described in any one of claims 1-5, characterized in that, The insulating cylinder (3) is screwed with end cap one (6) and end cap two (8) respectively. End cap one (6) is provided with connector one (9) inside. Connector one (9) is provided between connector one (9) and the adjacent capacitor (4). Connector one (9) is electrically connected to the connector (2) at the corresponding end. End cap two (8) is provided with connector two (10) inside. One end of connector two (10) abuts against the adjacent capacitor (4). The other end of connector two (10) is electrically connected to the corresponding connector (2).

7. The parallel capacitor for a circuit breaker as described in claim 6, characterized in that, A shielding pad (11) is provided between the conductive spring (5) and the adjacent capacitor (4).

8. The parallel capacitor for a circuit breaker as described in claim 1, characterized in that, At least two connectors (2) are provided at the end of the insulating cylinder (3), and two adjacent connectors (2) are connected to each other and have opposite opening directions.

9. The parallel capacitor for a circuit breaker as described in claim 8, characterized in that, The multiple connectors (2) are bent into an integrated structure.

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