High-capacity high-voltage single-break vacuum circuit breaker and power system

Abstract

The invention discloses a large-capacity high-voltage single-break vacuum circuit breaker and an electric power system, a vacuum arc-extinguishing chamber is located between a movable support and a static support, a static end is fixed on the static support, the static end is inserted into the vacuum arc-extinguishing chamber, the end part of the movable support is provided with a mounting groove, the movable end is located in the mounting groove, and the movable end is inserted into the mounting groove. The installation groove is communicated with the vacuum arc-extinguishing chamber, a conductive block and a spring contact finger are arranged between the movable end and the inner wall of the installation groove, the movable end directly faces the static end, and an output shaft of the operating mechanism is connected with one end of a guide rod through a transmission mechanism. The other end of the guide rod is inserted into the mounting groove and then is connected with the movable end; according to the vacuum circuit breaker and the power system, the breaking current is large, and the use requirement of a high-capacity unit can be met.

Description

Technical Field

[0001] The invention belongs to the field of electrical equipment design, and relates to a vacuum circuit breaker and a power system, and in particular to a large-capacity high-voltage single-break vacuum circuit breaker and a power system. Background Art

[0002] Pumped-storage power stations have the functions of peak and frequency regulation of the power grid, and can be connected to the grid with new power sources such as wind power and nuclear power to increase the consumption of new energy. They are currently the most mature large-scale energy storage method. At present, the demand for pumped-storage power stations is even stronger, and accelerating the construction of pumped-storage power stations is of great significance to promoting the consumption of clean energy. The single-unit capacity of pumped-storage generator sets can reach up to 375,000 kilowatts, and the protection of circuit breakers is indispensable between the export side and the step-up transformer. At present, in the industry, most of the export circuit breakers of large-capacity generators use SF6 circuit breakers, and most of them rely on imports.

[0003] The core of vacuum generator circuit breaker is vacuum interrupter. The mature single-tube interrupters on the market are 15kV, 6300A, and 80kA. Therefore, the current maximum single-tube circuit breaker is 15kV, 6300A, and 80kA; the parameters of the largest vacuum circuit breaker for pumped storage generators abroad are 24kA, 10000A, and 100kA, but the structure is three-tube parallel connection; similar products are also being developed in China, but the structure is six-tube parallel connection.

[0004] Due to the influence of arc extinguishing chamber manufacturing factors, it is very difficult to improve the rated current conduction capacity of existing vacuum generator circuit breakers. It is very difficult to manufacture vacuum circuit breakers with a breaking current greater than 63kA, and the price is also relatively expensive. Therefore, vacuum generator circuit breakers are currently used more in small-capacity units and their use in large units is limited. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a large-capacity high-voltage single-break vacuum circuit breaker and a power system. The vacuum circuit breaker and the power system have a large disconnecting current and can meet the use requirements of large-capacity units.

[0006] To achieve the above-mentioned object, in a first aspect, the present invention discloses a large-capacity high-voltage single-break vacuum circuit breaker, comprising a vacuum interrupter, a moving bracket, a stationary bracket, a moving end, a vacuum interrupter, an operating mechanism, a transmission mechanism and a guide rod;

[0007] The vacuum interrupter is located between a moving bracket and a stationary bracket, a stationary end is fixed on the stationary bracket, the stationary end is inserted into the vacuum interrupter, a mounting groove is provided at the end of the moving bracket, the moving end is located in the mounting groove, the mounting groove is communicated with the vacuum interrupter, a conductive block and a spring contact finger are provided between the moving end and the inner wall of the mounting groove, the moving end is directly opposite to the stationary end, the output shaft of the operating mechanism is connected to one end of the guide rod through a transmission mechanism, and the other end of the guide rod is connected to the moving end after being inserted into the mounting groove;

[0008] The dynamic support and the static support are both polygonal cylindrical structures.

[0009] The further improvement of the large-capacity high-voltage single-break vacuum circuit breaker of the present invention is:

[0010] Furthermore, it also includes a base frame, the operating mechanism is installed on the base frame, and the static bracket and the dynamic bracket are installed on the base frame through insulating support members.

[0011] Furthermore, the insulating support comprises a plurality of first insulators and a plurality of second insulators, wherein the static support is mounted on the base frame through each first insulator, and the dynamic support is mounted on the base frame through each second insulator.

[0012] Furthermore, the transmission mechanism includes a transmission shaft, an insulating pull rod and a crank arm, wherein the operating mechanism is connected to one end of the insulating pull rod via the transmission shaft, the other end of the insulating pull rod is connected to one end of the crank arm, and the other end of the crank arm is connected to the guide rod.

[0013] Furthermore, the guide rod is connected to the crank arm via a pin.

[0014] Furthermore, a contact spring is arranged in the movable bracket.

[0015] Furthermore, a support rod is provided between the static support and the vacuum arc extinguishing chamber.

[0016] In a second aspect, the present invention discloses an electric power system, comprising a pumped-storage generator set, a step-up transformer and a large-capacity high-voltage single-break vacuum circuit breaker, wherein the outlet side of the pumped-storage generator set is connected to the inlet side of the step-up transformer via the large-capacity high-voltage single-break vacuum circuit breaker.

[0017] The further improvement of the power system of the present invention is:

[0018] Furthermore, the large-capacity high-voltage single-break vacuum circuit breaker is installed in a vertical or horizontal manner.

[0019] Furthermore, when there are multiple large-capacity high-voltage single-break vacuum circuit breakers, the large-capacity high-voltage single-break vacuum circuit breakers are connected in series or in parallel.

[0020] The present invention has the following beneficial effects:

[0021] During the specific operation of the large-capacity, high-voltage, single-break vacuum circuit breaker and power system described in the present invention, the operating mechanism drives the moving end to move through the transmission mechanism and the guide rod, and cooperates with the vacuum arc extinguishing chamber to realize the conduction and separation between the moving end and the static end, and then realizes the opening and closing operations of the circuit breaker, which can achieve the disconnection of larger currents. In addition, the moving bracket and the static bracket in the present invention are both polygonal cylindrical structures with strong current-carrying capacity, which meet the use requirements of large-capacity units, have a simple structure, and are extremely practical.

[0022] Furthermore, the static support is installed on the base frame through each first insulator, and the dynamic support is installed on the base frame through each second insulator. The first insulator and the second insulator are used for insulation isolation, so the insulation effect is good and the cost is low. At the same time, the insulator has high mechanical strength and can withstand the electric force generated by the tolerance current.

[0023] Furthermore, a contact spring is also provided in the moving bracket. Preferably, the contact spring is a disc spring that meets the contact pressure requirement of 30000N. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a front view of the present invention;

[0026] Figure 2 A side view of the present invention;

[0027] Figure 3 Another side view of the present invention;

[0028] Figure 4 This is a structural diagram of the present invention when the single-pole is installed horizontally;

[0029] Figure 5 This is a structural diagram of the present invention when the single pole is installed vertically;

[0030] Figure 6 It is a structural diagram of the three-phase combination installation of the present invention.

[0031] Among them, 1 is a base frame, 2 is an insulator, 3 is a static bracket, 4 is a support rod, 5 is a vacuum arc extinguishing chamber, 6 is a conductive block, 7 is a spring contact finger, 8 is a moving bracket, 9 is a contact spring, 10 is a guide rod, 11 is a crank arm, 12 is an insulating pull rod, 13 is a transmission shaft, and 14 is an operating mechanism. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0034] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0035] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0036] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0037] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0040] Embodiment 1

[0041] The present invention takes industrial low-carbonization as the fulcrum, designs a 24kV / 10000A-125kA large-capacity and high-voltage single-break vacuum generator output circuit breaker by analyzing the characteristics of large capacity and vacuum single break. It is used in large-scale generator sets and reduces energy consumption and carbon emissions throughout the product's life cycle, saves raw materials, improves durability and recyclability, and benefits the entire ecological environment.

[0042] Specifically, refer to Figure 1 , Figure 2 and Figure 3 The large-capacity high-voltage single-break vacuum circuit breaker of the present invention comprises a base frame 1, an insulator 2, a static support 3, a support rod 4, a vacuum interrupter 5, a conductive block 6, a spring contact finger 7, a moving support 8, a contact spring 9, a guide rod 10, a crank arm 11, an insulating pull rod 12, a transmission shaft 13 and an operating mechanism 14;

[0043] The vacuum arc extinguishing chamber 5 is located between the moving bracket 8 and the static bracket 3. A static end is fixed on the static bracket 3, and the static end is inserted into the vacuum arc extinguishing chamber 5. A mounting groove is provided at the end of the moving bracket 8. The moving end is located in the mounting groove. The mounting groove is communicated with the vacuum arc extinguishing chamber 5. A conductive block 6 and a spring contact finger 7 are provided between the moving end and the inner wall of the mounting groove. The moving end is opposite to the static end. The moving bracket 8 and the static bracket 3 are respectively connected to external equipment.

[0044] The output shaft of the operating mechanism 14 is connected to one end of the guide rod 10 through a transmission mechanism, and the other end of the guide rod 10 is inserted into the installation groove and connected to the moving end. During operation, the operating mechanism drives the guide rod 10 through the transmission mechanism to move the guide rod 10, and drives the moving end to move through the guide rod 10. When the guide rod 10 drives the moving end to move and contacts the static end, the closing operation of the vacuum circuit breaker is realized. When the guide rod 10 drives the moving end to move and separates from the static end, the opening operation of the vacuum circuit breaker is realized with the cooperation of the vacuum interrupter 5. Among them, it should be noted that when the vacuum circuit breaker is in a closed state, that is, when the moving end is in contact with the static end, the moving bracket 8, the static bracket 3, the moving end, the static end conductive block 6 and the spring contact finger 7 form a conductive branch to meet the parameter requirements of the system. After testing, the parameter requirements that the present invention can meet are: rated voltage of 24kV, rated current of 10000A, 125kA rated breaking and peak closing current; 125kA short-time withstand current.

[0045] As an implementation mode of the present invention, this embodiment also includes a base frame 1, an operating mechanism 14 is installed on the base frame 1, and a static support 3 and a dynamic support 8 are installed on the base frame 1 through an insulating support member to achieve insulation between the base frame 1 and the dynamic support 8 and the static support 3, so as to avoid the current flowing through the dynamic support 8 and the static support 3 after the vacuum circuit breaker is closed, which will have an adverse effect on the equipment on the base frame 1, that is, to avoid the base frame 1 being energized, so as to improve the safety of the equipment.

[0046] Specifically, the insulating support member includes a plurality of first insulators 21 and a plurality of second insulators 22, wherein the static bracket 3 is installed on the base frame 1 through each first insulator 21, and the dynamic bracket 8 is installed on the base frame 1 through each second insulator 22. The first insulators 21 and the second insulators 22 are used for insulation isolation, and the insulation effect is good and the cost is low. At the same time, the insulator has high mechanical strength and can withstand the electric force generated by the tolerance current.

[0047] As an embodiment of the present invention, the transmission mechanism includes a transmission shaft 13, an insulating pull rod 12 and a crank arm 11, wherein the operating mechanism is connected to one end of the insulating pull rod 12 via the transmission shaft 13, the other end of the insulating pull rod 12 is connected to one end of the crank arm 11, the other end of the crank arm 11 is connected to the guide rod 10, and the middle axis of the crank arm 11 is connected to the moving bracket 8.

[0048] During operation, the operating mechanism drives the insulating pull rod 12 to move through the transmission shaft 13, the insulating pull rod 12 drives one end of the crank arm 11 to move, the other end of the crank arm 11 drives the guide rod 10 to move, and the guide rod 10 drives the moving end to move, thereby realizing the contact and separation between the moving end and the static end, that is, realizing the opening and closing of the vacuum circuit breaker.

[0049] As an implementation mode of the present invention, the dynamic bracket 8 and the static bracket 3 are both polygonal cylindrical structures with strong current carrying capacity and meet the connection requirements of interface equipment.

[0050] As an implementation mode of the present invention, the guide rod 10 is connected to the crank arm 11 via a pin to achieve transmission between the crank arm 11 and the guide rod 10 .

[0051] As an implementation mode of the present invention, a contact spring 9 is further provided in the movable bracket 8. Preferably, the contact spring 9 is a disc spring that meets the contact pressure requirement of 30000N.

[0052] As an implementation mode of the present invention, a support rod 4 is provided between the static support 3 and the vacuum arc extinguishing chamber 5 .

[0053] The working process of the present invention is:

[0054] The operating mechanism drives the insulating rod 12 to push upward through the transmission shaft 13, and pushes one end of the crank arm 11 upward through the insulating rod 12, so that the other end of the crank arm 11 drives the guide rod 10 to move toward the static end. During the movement, the guide rod 10 drives the moving end to move toward the static end, and finally makes the static end contact with the moving end, so as to realize the closing operation of the circuit breaker. At this time, the static support 3, the static end, the moving end, the conductive block 6, the spring contact finger 7 and the moving support 8 form a conductive path; when the circuit breaker needs to be opened, the operating mechanism drives the insulating rod 12 to pull downward through the transmission shaft 13, and the insulating rod 12 pulls one end of the crank arm 11 to move downward, so that the other end of the crank arm 11 drives the guide rod 10 to move away from the static end. During the movement, the guide rod 10 drives the moving end to separate from the static end, and at the same time, under the action of the vacuum arc extinguishing chamber 5, the opening operation of the circuit breaker is realized. At this time, the path formed by the static support 3, the static end, the moving end, the conductive block 6, the spring contact finger 7 and the moving support 8 is disconnected.

[0055] It should be noted that the present invention has the following characteristics:

[0056] 1) The present invention adopts an operating mechanism, a transmission mechanism, a guide rod 10 and a vacuum interrupter 5 to complete the closing and opening operations, and maintain the closing and opening states, thereby ensuring the short-circuit breaking and closing parameters required by the project.

[0057] 2) The design structure of the circuit breaker of the present invention meets the mechanism output requirement under 30000N electric power.

[0058] 3) The design structure of the circuit breaker of the present invention meets 24kV, 125kA rated breaking and peak closing design, and 125kA short-time withstand design.

[0059] 4) The moving bracket 8 and the static bracket 3 are polygonal cylindrical structures, which can ensure the current carrying capacity required by the project and meet the connection with the interface equipment.

[0060] 5) In addition, refer to Figure 4 , Figure 5 and Figure 6 The vacuum circuit breaker of the present invention adopts a modular design and can be installed horizontally or vertically; it can be used as a single pole or a three-pole combination for a three-phase AC system; at the same time, it can be connected in series or in parallel for higher voltage and larger systems.

[0061] Embodiment 2

[0062] In this embodiment, the large-capacity high-voltage single-break vacuum circuit breaker is applied to a pumped-storage power generation system. This embodiment discloses a power system, which includes a pumped-storage power generation unit, a step-up transformer, and a large-capacity high-voltage single-break vacuum circuit breaker, wherein the large-capacity high-voltage single-break vacuum circuit breaker includes a vacuum interrupter 5, a moving bracket 8, a stationary bracket 3, a moving end, an operating mechanism 14, a transmission mechanism, and a guide rod 10;

[0063] The vacuum arc extinguishing chamber 5 is located between the moving bracket 8 and the static bracket 3, a static end is fixed on the static bracket 3, and the static end is inserted into the vacuum arc extinguishing chamber 5. A mounting groove is provided at the end of the moving bracket 8, and the moving end is located in the mounting groove, and the mounting groove is communicated with the vacuum arc extinguishing chamber 5. A conductive block 6 and a spring contact finger 7 are provided between the moving end and the inner wall of the mounting groove, and the moving end is opposite to the static end. The output shaft of the operating mechanism 14 is connected to one end of the guide rod 10 through a transmission mechanism, and the other end of the guide rod 10 is inserted into the mounting groove and then connected to the moving end. The moving bracket 8 is connected to the outlet side of the pumped storage generator set, and the static bracket 3 is connected to the inlet side of the step-up transformer.

[0064] During operation, the operating mechanism drives the guide rod 10 through the transmission mechanism, so that the guide rod 10 moves, and the guide rod 10 drives the moving end to move. When the guide rod 10 drives the moving end to move and contacts the static end, the pumped-storage generator set, the large-capacity high-voltage single-break vacuum circuit breaker and the step-up transformer are turned on. In addition, the operating mechanism drives the guide rod 10 through the transmission mechanism, so that the guide rod 10 moves in the opposite direction, and then the moving end is separated from the static end, and then the pumped-storage generator set and the step-up transformer are disconnected with the cooperation of the vacuum interrupter 5.

[0065] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention is indicated by the following claims.

[0066] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A large-capacity, high-voltage single-break vacuum circuit breaker, characterized in that: It comprises a vacuum interrupter (5), a moving support (8), a stationary support (3), a moving end, a vacuum interrupter (5), an operating mechanism (14), a transmission mechanism and a guide rod (10); The vacuum arc extinguishing chamber (5) is located between a moving support (8) and a stationary support (3); a stationary end is fixed on the stationary support (3); the stationary end is inserted into the vacuum arc extinguishing chamber (5); a mounting groove is provided at the end of the moving support (8); the moving end is located in the mounting groove; the mounting groove is connected to the vacuum arc extinguishing chamber (5); a conductive block (6) and a spring contact finger (7) are provided between the moving end and the inner wall of the mounting groove; the moving end is directly opposite to the stationary end; the output shaft of the operating mechanism (14) is connected to one end of a guide rod (10) through a transmission mechanism; the other end of the guide rod (10) is connected to the moving end after being inserted into the mounting groove; The dynamic support (8) and the static support (3) are both polygonal cylindrical structures.

2. The large-capacity high-voltage single-break vacuum circuit breaker according to claim 1 is characterized in that: It also comprises a base frame (1), an operating mechanism (14) is mounted on the base frame (1), and a static support (3) and a dynamic support (8) are mounted on the base frame (1) via insulating support members.

3. The large-capacity high-voltage single-break vacuum circuit breaker according to claim 2 is characterized in that: The insulating support comprises a plurality of first insulators (21) and a plurality of second insulators (22), wherein the stationary support (3) is mounted on the base frame (1) via each first insulator (21), and the moving support (8) is mounted on the base frame (1) via each second insulator (22).

4. The large-capacity high-voltage single-break vacuum circuit breaker according to claim 1, characterized in that: The transmission mechanism comprises a transmission shaft (13), an insulating pull rod (12) and a crank arm (11), wherein the operating mechanism is connected to one end of the insulating pull rod (12) via the transmission shaft (13), the other end of the insulating pull rod (12) is connected to one end of the crank arm (11), and the other end of the crank arm (11) is connected to the guide rod (10).

5. The large-capacity high-voltage single-break vacuum circuit breaker according to claim 4, characterized in that: The guide rod (10) is connected to the crank arm (11) via a pin shaft.

6. The large-capacity high-voltage single-break vacuum circuit breaker according to claim 1, characterized in that: A contact spring (9) is arranged in the movable bracket (8).

7. The large-capacity high-voltage single-break vacuum circuit breaker according to claim 1, characterized in that: A support rod (4) is provided between the static support (3) and the vacuum arc extinguishing chamber (5).

8. A power system, characterized in that: It comprises a pumped-storage generator set, a step-up transformer and the large-capacity high-voltage single-break vacuum circuit breaker as described in any one of claims 1 to 7, wherein the outlet side of the pumped-storage generator set is connected to the inlet side of the step-up transformer via the large-capacity high-voltage single-break vacuum circuit breaker.

9. The power system according to claim 8, characterized in that: The large-capacity high-voltage single-break vacuum circuit breaker is installed in a vertical or horizontal manner.

10. The power system according to claim 8, characterized in that: When there are multiple large-capacity high-voltage single-break vacuum circuit breakers, the large-capacity high-voltage single-break vacuum circuit breakers are connected in series or in parallel.

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