A circuit breaker for a 10 kV gas-insulated switchgear

Abstract

The present invention discloses a circuit breaker for a 10 kV gas-insulated switchgear, which includes an earthing switch and two mounting plates arranged at intervals. An earthing knife switch is inlaid between the bottoms of the two mounting plates. The earthing switch includes a moving knife rotating frame and an earthing knife contact provided on the moving knife rotating frame. The moving knife rotating frame is rotatably inlaid between the two mounting plates. This circuit breaker for a 10 kV gas-insulated switchgear has the advantages of high structural strength, fast opening and closing speed, good opening and closing stability, and being able to withstand a large current repulsive force, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of gas-insulated switchgear, and particularly to a circuit breaker for a 10 kV gas-insulated switchgear. Background Art

[0002] With the research and development of new processes and new materials, the types of high-voltage switchgears are becoming increasingly rich. However, gas-insulated switchgear still plays an important role in the 10 kV power transmission and distribution system.

[0003] In a gas-insulated switchgear, the circuit breaker is a very important primary component. To a large extent, whether the power transmission and distribution system can operate safely depends on the performance of the circuit breaker being powerful and reliable.

[0004] In the current market, the circuit breaker used in gas-insulated switchgear with an integrated isolating and earthing switch has obvious deficiencies. Especially in the earthing switch part, existing earthing switches basically use an independent toggle arm to drive the moving blade. Its structural strength is relatively weak, the opening and closing speed is slow, and the stability during opening and closing is not good enough. Therefore, the closing ability of the earthing knife switch is not strong. However, the earthing switch is a commonly used switch device that is widely used in the power distribution system to protect personal and equipment safety. During the closing process of the earthing switch, the load may reverse current to the earthing switch, and the instantaneous value of the current reaches dozens of kiloamperes. The electromagnetic force generated by the huge instantaneous current has a great impact on the reliable closing of the earthing switch. The earthing switches of existing gas-insulated switchgears are difficult to withstand a large electromagnetic force. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a circuit breaker for a 10 kV gas-insulated switchgear with high structural strength, fast opening and closing speed, good opening and closing stability, and capable of withstanding a large electromagnetic force.

[0006] To solve the above technical problem, the present invention adopts the following technical solutions:

[0007] A circuit breaker for a 10 kV gas-insulated switchgear includes an earthing switch and two spaced-apart mounting plates. An earthing knife switch is embedded between the bottoms of the two mounting plates. The earthing switch includes a moving blade rotating frame and an earthing blade contact provided on the moving blade rotating frame. The moving blade rotating frame is rotatably embedded between the two mounting plates.

[0008] As a further improvement of the above technical solution:

[0009] An installation groove is provided on the moving blade rotating frame. The earthing blade contact is fixed in the installation groove. One end of the earthing blade contact is provided with a contact for contacting the earthing knife switch.

[0010] A base is also inlaid between the bottoms of the two mounting plates. A knife rest is provided on the base. The knife rest is provided with a hinge hole coaxial with the rotation center of the moving knife rotating frame. One end of the grounding knife contact away from the contact head is hinged in the hinge hole on the knife rest.

[0011] The grounding knife contact includes two parallel contact bars. The two contact bars are fixed in the installation groove. The contact head is connected to one end of the two contact bars. The other ends of the two contact bars are hinged in the hinge hole on the knife rest.

[0012] The two contact bars are fixed in the installation groove through a pin shaft.

[0013] A contact block is provided at the position of the grounding knife switch corresponding to the contact head.

[0014] At least three grounding knife contacts are provided, and the grounding knife contacts are distributed at intervals along the axial direction of the moving knife rotating frame.

[0015] An isolating switch is provided between the tops of the two mounting plates.

[0016] Insulating plates are provided on both sides of the isolating switch on the two mounting plates.

[0017] A vacuum arc extinguishing chamber is formed between the two insulating plates above the isolating switch.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] The circuit breaker for a 10kV gas-insulated switchgear of the present invention includes a grounding switch and two spaced-apart mounting plates. A grounding knife switch is inlaid between the bottoms of the two mounting plates. The grounding switch includes a moving knife rotating frame and a grounding knife contact provided on the moving knife rotating frame. The moving knife rotating frame is rotatably inlaid between the two mounting plates. The closing process of the grounding switch: the moving knife rotating frame rotates, so that the grounding knife contact on the moving knife rotating frame contacts the grounding knife switch to realize closing. The direct-axis drive of the moving knife rotating frame has better strength. In the event of extreme working conditions, it can withstand greater forces, is more stable during closing, has a short bounce time, the grounding knife contact is not easily damaged when contacting the grounding knife switch, and the energy transmission loss of the operating mechanism is reduced, and the closing speed is faster. The circuit breaker for a 10kV gas-insulated switchgear has high structural strength, fast opening and closing speeds, good opening and closing stability, and can withstand large current repulsive forces. Description of the Drawings

[0020] Figure 1 It is a front structural schematic diagram of the circuit breaker for a 10kV gas-insulated switchgear of the present invention.

[0021] Figure 2 It is a back structural schematic diagram of the circuit breaker for a 10kV gas-insulated switchgear of the present invention.

[0022] Figure 3 It is Figure 2Enlarged view of location A

[0023] Figure 4 It is a schematic perspective view of the moving knife rotating frame of the circuit breaker for a 10kV gas-insulated switchgear according to the present invention.

[0024] Figure 5 is Figure 4 Enlarged view of location B

[0025] Each label in the figure represents:

[0026] 1. Earthing switch; 11. Moving knife rotating frame; 111. Installation groove; 12. Earthing knife contact; 121. Contact strip; 13. Pin shaft; 2. Mounting plate; 3. Earthing knife switch; 31. Contact block; 4. Contact; 5. Base; 6. Knife seat; 7. Isolating knife switch; 8. Insulating plate; 81. Branch busbar; 82. Mounting block; 83. Mounting hole; 9. Vacuum interrupter. Detailed implementation mode

[0027] The present invention will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0028] Figures 1 to 5 An embodiment of the circuit breaker for a 10kV gas-insulated switchgear according to the present invention is shown. The circuit breaker for a 10kV gas-insulated switchgear includes an earthing switch 1 and two spaced-apart mounting plates 2. An earthing knife switch 3 is embedded between the bottoms of the two mounting plates 2. The earthing switch 1 includes a moving knife rotating frame 11 and an earthing knife contact 12 provided on the moving knife rotating frame 11. The moving knife rotating frame 11 is rotatably embedded between the two mounting plates 2. During the closing process of the earthing switch 1: the moving knife rotating frame 11 rotates, so that the earthing knife contact 12 on the moving knife rotating frame 11 contacts the earthing knife switch 3 to achieve closing. The direct-axis drive of the moving knife rotating frame 11 has better strength. In the event of extreme working conditions, it can withstand greater forces, is more stable during closing, has a short bounce time, the earthing knife contact 12 is not easily damaged when contacting the earthing knife switch 3, and the energy transmission loss of the operating mechanism is reduced, and the closing speed is faster. The circuit breaker for a 10kV gas-insulated switchgear has high structural strength, fast opening and closing speeds, good opening and closing stability, and can withstand a large current repulsive force.

[0029] In this embodiment, as Figure 3 and Figure 5 shown, the moving knife rotating frame 11 is provided with an installation groove 111, the earthing knife contact 12 is fixed in the installation groove 111, and one end of the earthing knife contact 12 is provided with a contact 4 for contacting the earthing knife switch 3. During the closing process of the earthing switch 1: the moving knife rotating frame 11 rotates, driving the earthing knife contact 12 to move, so that the contact 4 on the earthing knife contact 12 contacts the earthing knife switch 3 to achieve closing.

[0030] In this embodiment, as Figures 1 to 3As shown, a base 5 is also embedded between the bottoms of two mounting plates 2. A tool holder 6 is provided on the base 5. The tool holder 6 is provided with a hinge hole coaxial with the rotation center of the moving knife rotating frame 11. One end of the grounding knife contact 12 away from the contact head 4 is hinged in the hinge hole on the tool holder 6. The base 5 is embedded between the two mounting plates 2, which is convenient for installation. One end of the grounding knife contact 12 away from the contact head 4 is hinged in the hinge hole on the tool holder 6, making the rotation of the moving knife rotating frame 11 more stable. In the event of extreme working conditions, it can withstand greater forces, that is, it can withstand greater current repulsive forces.

[0031] In this embodiment, as Figure 1 , Figure 3 and Figure 5 shown, the grounding knife contact 12 includes two parallel contact strips 121. The two contact strips 121 are fixed in the installation groove 111. The contact head 4 is connected to one end of the two contact strips 121. The other ends of the two contact strips 121 are hinged in the hinge hole on the tool holder 6. Specifically, the two contact strips 121 are fixed in the installation groove 111 through a pin shaft 13. The two contact strips 121 are fixed in the installation groove 111 through at least two pin shafts 13, which is convenient for disassembly and assembly.

[0032] In this embodiment, as Figure 1 shown, a contact block 31 is provided at the position of the grounding knife switch 3 corresponding to the contact head 4. Closing process of the grounding switch 1: The moving knife rotating frame 11 rotates, driving the grounding knife contact 12 to move, so that the contact head 4 on the grounding knife contact 12 contacts the contact block 31 on the grounding knife switch 3, realizing closing.

[0033] In this embodiment, at least three grounding knife contacts 12 are provided, and the grounding knife contacts 12 are distributed at intervals along the axial direction of the moving knife rotating frame 11. Contact blocks 31 are provided at the positions of the grounding knife switch 3 corresponding to each contact head 4.

[0034] In this embodiment, as Figure 1 and Figure 2 shown, an isolating switch 7 is provided between the tops of the two mounting plates 2. Insulating plates 8 are provided on both sides of the isolating switch 7 of the two mounting plates 2. A vacuum arc extinguishing chamber 9 is formed between the two insulating plates 8 above the isolating switch 7. Branch busbars 81 and mounting blocks 82 are provided on the insulating plates 8, and mounting holes 83 are provided on the mounting blocks.

[0035] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A circuit breaker for a 10 kV gas-insulated switchgear, characterized in that: It includes an earthing switch (1) and two spaced-apart mounting plates (2). An earthing knife switch (3) is embedded between the bottoms of the two mounting plates (2). The earthing switch (1) includes a moving knife carrier (11) and an earthing knife contact (12) provided on the moving knife carrier (11). The moving knife carrier (11) is rotatably embedded between the two mounting plates (2). An installation groove (111) is provided on the moving knife carrier (11), and the earthing knife contact (12) is fixed in the installation groove (111). One end of the earthing knife contact (12) is provided with a contact head (4) for contacting the earthing knife switch (3). A base (5) is also embedded between the bottoms of the two mounting plates (2). A knife seat (6) is provided on the base (5). An articulated hole coaxial with the rotation center of the moving knife carrier (11) is provided on the knife seat (6). The end of the earthing knife contact (12) away from the contact head (4) is articulated in the articulated hole on the knife seat (6). The earthing knife contact (12) includes two parallel contact bars (121). The two contact bars (121) are fixed in the installation groove (111). The contact head (4) is connected to one end of the two contact bars (121). The other ends of the two contact bars (121) are articulated in the articulated hole on the knife seat (6). The two contact bars (121) are fixed in the installation groove (111) by a pin shaft (13); at least three earthing knife contacts (12) are provided, and the earthing knife contacts (12) are spaced apart along the axial direction of the moving knife carrier (11).

2. The circuit breaker for a 10 kV gas-insulated switchgear according to claim 1, characterized in that: A contact block (31) is provided at the position of the earthing knife switch (3) corresponding to the contact head (4).

3. The circuit breaker for 10 kV gas-insulated switchgear according to claim 1 or 2, characterized in that: An isolating switch (7) is provided between the tops of the two mounting plates (2).

4. The circuit breaker for 10 kV gas-insulated switchgear according to claim 3, characterized in that: Insulating plates (8) are provided on both sides of the isolating switch (7) of the two mounting plates (2).

5. The circuit breaker for 10 kV gas-insulated switchgear according to claim 4, characterized in that: A vacuum arc extinguishing chamber (9) is formed between the two insulating plates (8) above the isolating switch (7).

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