Compact environment-friendly gas insulated circuit breaker

Abstract

The utility model discloses a compact environment-friendly gas-insulated circuit breaker, which comprises an external gas tank, a vacuum circuit breaking structure is arranged in the external gas tank, the vacuum circuit breaking structure comprises an assembly support which is arranged in the external gas tank and comprises a left side plate, a right side plate, an upper plate, a middle plate, a lower plate, a back plate and four middle partition plates, the upper plate, the middle plate, the lower plate, the back plate and the middle partition plate are spliced through a mortise and tenon joint structure, and the assembling support and a bottom support on the inner wall of the external air box are fixedly connected with a grounding copper bar. According to the compact type environment-friendly gas insulation circuit breaker, the vacuum circuit breaking structure is installed and supported through the assembling support, so that the whole structure is compactly arranged, metal plate and other metal piece materials used by the whole are reduced, the total mass of a cabinet body is lighter, field installation and implementation are facilitated, and the three permanent magnet operating mechanisms are still adopted; the reliability which cannot be achieved by a spring structure is high, and maintenance is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a compact environmentally friendly gas-insulated circuit breaker. Background Art

[0002] In the field of medium-voltage distribution networks, with the trend of "de-SF6ization", metal-enclosed circuit breakers insulated with pollution-free environmentally friendly gases such as air and nitrogen have quietly entered the market. Almost all of them are equipped with traditional spring operating mechanisms. Compared with permanent magnets, spring operating mechanisms have more mechanism parts, require regular lubrication, are prone to rust, have poor reliability, and have large discreteness in opening and closing. When a line fault occurs, the cut-off time is more than 20ms, and the permanent magnet mechanism generally has an action time of no more than 8ms, which reduces the duration of the fault by more than half and has less impact on the line. On the other hand, the unit cabinet width of the national standard environmentally friendly gas cabinet is 420mm, which is the limit that most manufacturers can achieve, resulting in an increase in occupied area. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a compact environmentally friendly gas insulated circuit breaker, which solves the problems of the prior art circuit breaker occupying a large area and being unable to perform normal pressure insulation.

[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: A compact environmentally friendly gas insulated circuit breaker includes an external gas box, a vacuum circuit breaker structure is arranged in the external gas box, and the vacuum circuit breaker structure includes:

[0005] An assembly bracket is installed inside the external air box, and the assembly bracket includes two left and right side panels, an upper panel, a middle panel, a lower panel, a back panel and four middle partition panels. The upper panel, the middle panel, the lower panel, the back panel and the middle partition panel are spliced ​​by mortise and tenon structures. The left and right side panels are fixedly connected to the upper panel and the lower panel by bolts, and an insulating sealing plate is also fixed between the two side panels. The assembly bracket is fixedly connected to the bottom bracket of the inner wall of the external air box with a grounding copper bar;

[0006] The circuit breaker switch unit is arranged inside the assembly bracket, the circuit breaker switch unit is composed of a switch unit and a circuit breaker unit, the switch unit includes an isolating knife, an insulating pull rod and a vacuum arc extinguishing chamber, and the circuit breaker unit includes three permanent magnet operating mechanisms.

[0007] Preferably, the width of the external air box is 375 mm, the interior of the external air box is filled with dry air at a slightly positive pressure for space insulation, and the inner wall of the external air box is lined with FR4 fiberglass board for auxiliary insulation, and the side conductive rods are coated with rubber to strengthen insulation.

[0008] Preferably, the three permanent magnet operating mechanisms are vertically placed on the lower side of the switch unit, the upper closing screw is connected to the insulating pull rod, the insulating pull rod is connected to the vacuum arc chamber, and the isolation knife seat and the knife switch are placed on the upper part of the vacuum arc chamber.

[0009] Preferably, the mortise and tenon structure consists of an L-shaped tenon and a mortise groove, and the width of the L-shaped opening of the L-shaped tenon is the same as the thickness of the plate.

[0010] Preferably, an isolation knife operating mechanism and a separation mechanism are provided on the left side of the external air box, the isolation knife operating mechanism is connected to the isolation knife, and the separation mechanism is connected to the insulating pull rod.

[0011] Preferably, an observation port is also provided on the left side of the external air box for observing the internal situation of the external air box, an upper sleeve is provided on the top of the external air box, and a lower sleeve is provided below the left side of the external air box, and a pressure gauge is also provided on the left side of the external air box. Beneficial Effects

[0012] The utility model provides a compact environmentally friendly gas insulated circuit breaker. Compared with the prior art, it has the following beneficial effects:

[0013] 1. This compact environmentally friendly gas-insulated circuit breaker uses an assembly bracket to support the vacuum circuit breaker structure, so that the overall structure is compactly arranged, the overall metal materials such as sheet metal used are also reduced, the total weight of the cabinet is lighter, and it is convenient for on-site installation and implementation. It still uses a three-permanent magnet operating mechanism, which has the characteristics of high reliability that the spring structure cannot achieve, maintenance-free, not affected by the external environment and rusting, fast action speed, and short fault duration.

[0014] 2. The compact environmentally friendly gas-insulated circuit breaker has an improved atmospheric pressure air-insulated permanent magnet cabinet with a width of 375mm, which is more than 10% lower than the traditional 420mm standard cabinet. When the cabinets are assembled into a box room, the overall floor space is reduced by more than 10%. An average of 1,000 ring network units in a city can save a lot of urban land resources. It is insulated with atmospheric pressure air, easy to obtain, and has a lower overall cost. There is no pressure relief and greenhouse gas effect like SF6 gas filling cabinets, and there is no risk of short-term suffocation in a confined space caused by leakage of other environmentally friendly gas cabinets (nitrogen, C4 mixed gas, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the appearance of the utility model;

[0016] Figure 2 It is an internal schematic diagram of the utility model;

[0017] Figure 3 It is a schematic diagram of assembling the bracket and the circuit breaker switch unit of the utility model;

[0018] Figure 4 It is a side and rear view of the assembly bracket and the circuit breaker switch unit of the utility model;

[0019] Figure 5 It is a schematic diagram of the assembly of the upper plate, the partition plate and the back plate of the utility model;

[0020] Figure 6 It is a side view of the upper plate, the partition plate and the back plate of the utility model;

[0021] Figure 7 It is a schematic diagram of the assembly of the partition and the back plate of the utility model;

[0022] Figure 8 It is an enlarged view of point A of the present utility model.

[0023] In the figure: 1. External gas box; 2. Assembly bracket; 21. Side plate; 22. Upper plate; 23. Middle plate; 24. Lower plate; 25. Back plate; 26. Middle partition; 27. Insulation sealing plate; 3. Mortise and tenon structure; 31. L-shaped tenon; 32. Mortise and tenon groove; 4. Grounding copper busbar; 5. Circuit breaker switch unit; 51. Switch unit; 511. Isolation knife; 512. Insulation pull rod; 513. Vacuum interrupter; 52. Circuit breaker unit; 521. Three permanent magnet operating mechanism; 6. Isolation knife operating mechanism; 7. Breaker mechanism; 8. Observation port; 9. Upper casing; 10. Lower casing; 11. Pressure gauge. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The compact environmentally friendly gas-insulated circuit breaker offers two technical solutions:

[0026] like Figure 1-8 The first embodiment includes an external gas box 1, in which a vacuum circuit breaker structure is arranged, and the vacuum circuit breaker structure includes:

[0027] An assembly bracket 2 is provided with a vacuum circuit breaker structure in the external gas box 1, and the vacuum circuit breaker structure includes: the assembly bracket 2 is installed inside the external gas box 1, and includes two left and right side panels 21, an upper panel 22, a middle panel 23, a lower panel 24, a back panel 25 and four middle partition panels 26. The upper panel 22, the middle panel 23, the lower panel 24, the back panel 25 and the middle partition panels 26 are spliced ​​by a mortise and tenon structure 3. The left and right side panels 21 are fixedly connected with the upper panel 22 and the lower panel 24 by bolts, and an insulating sealing plate 27 is also fixed between the two side panels 21. The assembly bracket 2 is fixedly connected with the bottom bracket of the inner wall of the external gas box 1 with a grounding copper bar 4, and the mortise and tenon structure 3 is composed of an L-shaped tenon 31 and a mortise groove 32, and the width of the L-shaped mouth of the L-shaped tenon 31 is the same as the thickness of the plate;

[0028] The circuit breaker switch unit 5 is arranged inside the assembly bracket 1. The circuit breaker switch unit 5 consists of a switch unit 51 and a circuit breaker unit 52. The switch unit 51 includes an isolating knife 511, an insulating rod 512 and a vacuum arc chamber 513. The circuit breaker unit 52 includes a three-permanent magnetic operating mechanism 521. The three-permanent magnetic operating mechanism 521 is vertically arranged on the lower side of the switch unit 51. The upper closing screw is connected to the insulating rod 512, and the insulating rod 512 is connected to the vacuum arc chamber 513. The isolating knife seat and the knife switch are placed on the upper part of the vacuum arc chamber 513. The isolating knife operating mechanism 6 and the breaking mechanism 7 are arranged on the left side of the external gas box 1. The isolating knife operating mechanism 6 is connected to the isolating knife 511, and the breaking mechanism 7 is connected to the insulating rod 512.

[0029] The vacuum circuit breaker structure is supported by assembling bracket 2, so that the overall structure is arranged compactly, the overall metal materials such as sheet metal are also reduced, the total weight of the cabinet is lighter, and it is convenient for on-site installation and implementation. The three permanent magnet operating mechanism is still used, which has the characteristics of high reliability that the spring structure cannot achieve, maintenance-free, not affected by the external environment and rusting, fast action speed, and short fault duration.

[0030] like Figure 1 and 2 The second embodiment is shown, and the main difference from the first embodiment is that it includes an external air box, the width of the external air box 1 is 375 mm, the interior of the external air box 1 is filled with slightly positive pressure dry air for space insulation, and the inner wall of the external air box 1 is lined with FR4 fiberglass board for auxiliary insulation, the side conductive rods are coated with rubber to strengthen the insulation, an observation port 8 is provided on the left side of the external air box 1 for observing the internal situation of the external air box 1, an upper sleeve 9 is provided on the top of the external air box 1, and a lower sleeve 10 is provided at the bottom of the left side of the external air box, and a pressure gauge 11 is provided on the left side of the external air box 1.

[0031] The width of the improved atmospheric pressure air external gas box 1 is 375mm, which is more than 10% lower than the traditional 420mm standard cabinet. When the cabinets are assembled into a container room, the overall floor space is reduced by more than 10%. There are an average of 1,000 ring network units in a city, which can save a lot of urban land resources. Atmospheric pressure air is insulated and easy to obtain, with lower overall cost. There is no pressure relief and greenhouse gas effect like SF6 gas filling cabinets, and there is no risk of short-term suffocation in a confined space caused by leakage of other environmentally friendly gas cabinets (nitrogen, C4 mixed gas, etc.).

[0032] When in use, the integral circuit breaker switch unit 5 is sealed in an external air box 1 with a width of 375mm and filled with dry air at a slightly positive pressure for spatial insulation. When the isolating knife switch is in the open position, the knife seat on the knife switch is 115mm away from the knife switch contact at the closest vertical distance, and the knife switch contact is 115mm away from the side grounding knife seat, meeting the protective air insulation requirements. The knife switch contact is 60mm away from the nearest vertical distance from the side wall of the external air box 1. The auxiliary insulation is provided by lining the air box wall with FR4 glass fiber board to ensure the insulation strength of the high-voltage electrode to the ground. The side conductive rods are coated with rubber to strengthen the insulation. In the type test, the withstand voltage standards of 42kV for the overall switch to the ground, 48kV for the isolating break, and 42kV for the isolation to the ground can be met.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compact environmentally friendly gas-insulated circuit breaker, comprising an external gas box (1), characterized in that: A vacuum circuit breaker structure is provided in the external air box (1), and the vacuum circuit breaker structure comprises: An assembly bracket (2) is installed inside the external air box (1), the assembly bracket (2) comprises two left and right side panels (21), an upper panel (22), a middle panel (23), a lower panel (24), a back panel (25) and four middle partition panels (26), the upper panel (22), the middle panel (23), the lower panel (24), the back panel (25) and the middle partition panels (26) are spliced ​​together by a mortise and tenon structure (3), the left and right side panels (21) are fixedly connected to the upper panel (22) and the lower panel (24) by bolts, and an insulating sealing plate (27) is also fixed between the two side panels (21), and a grounding copper bar (4) is fixedly connected to the assembly bracket (2) and the bottom bracket of the inner wall of the external air box (1); A circuit breaker switch unit (5), the circuit breaker switch unit (5) being arranged inside an external gas box (1), the circuit breaker switch unit (5) comprising a switch unit (51) and a circuit breaker unit (52), the switch unit (51) comprising an isolating knife (511), an insulating pull rod (512) and a vacuum arc extinguishing chamber (513), and the circuit breaker unit (52) comprising a three-permanent magnet operating mechanism (521).

2. A compact environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: The width of the external air box (1) is 375 mm. The interior of the external air box (1) is filled with dry air at a slightly positive pressure for space insulation. The inner wall of the external air box (1) is lined with FR4 glass fiber board for auxiliary insulation, and the side conductive rods are coated with rubber to strengthen insulation.

3. A compact environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: The three permanent magnet operating mechanisms (521) are vertically arranged on the lower side of the switch unit (51); the upper closing screw is connected to the insulating pull rod (512); the insulating pull rod (512) is connected to the vacuum interrupter (513); and an isolating knife seat and a knife switch are placed on the upper part of the vacuum interrupter (513).

4. The compact environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: The mortise and tenon structure (3) consists of an L-shaped tenon (31) and a tenon groove (32), and the width of the L-shaped opening of the L-shaped tenon (31) is the same as the thickness of the plate.

5. The compact environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: An isolating knife operating mechanism (6) and a separating mechanism (7) are provided on the left side of the external air box (1); the isolating knife operating mechanism (6) is connected to the isolating knife (511), and the separating mechanism (7) is connected to the insulating pull rod (512).

6. The compact environmentally friendly gas insulated circuit breaker according to claim 1, characterized in that: The left side of the external air box (1) is also provided with an observation port (8) for observing the internal conditions of the external air box (1), the top of the external air box (1) is provided with an upper sleeve (9), and the lower part of the left side of the external air box is provided with a lower sleeve (10), and the left side of the external air box (1) is also provided with a pressure gauge (11).

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