Environment-friendly gas cabinet

Abstract

The invention discloses an environment-friendly gas cabinet which comprises a gas cabinet body, the gas cabinet body comprises an operating mechanism, a circuit breaker gas chamber, a bus gas chamber, a base and a secondary instrument chamber, the circuit breaker gas chamber is in an inverted L shape, the bus gas chamber is located at a notch of the circuit breaker gas chamber, and the circuit breaker gas chamber and the bus gas chamber are filled with clean air. The three-position switch comprises an isolating switch assembly and a grounding switch assembly, the bottom surface of the bus air chamber is rotatably connected with a first sealing rotating shaft and a second sealing rotating shaft, the first sealing rotating shaft is connected with the isolating switch assembly, the second sealing rotating shaft is connected with the grounding switch assembly, and the isolating switch assembly is connected with the grounding switch assembly. Rotation of the crank arm assembly is controlled through the operating mechanism, the first pull rod and the second pull rod are made to stretch out and draw back, the first sealing rotating shaft and the second sealing rotating shaft are pushed to rotate, the disconnecting switch assembly and the grounding switch assembly are made to operate, and operation of the three-position switch is more stable through gear and rack transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical cabinets, in particular to an environmentally friendly gas cabinet. Background Art

[0002] Switchgear is a common complete set of switchgear. Isolation and grounding combination switches are used in switchgear. The electrical connection transmission device drives the movement of the moving contact to achieve isolation, grounding and the middle three positions of the combination electrical appliance. In traditional electrical connections, the transmission device of the moving contact is a gear-driven connecting rod that enables the moving contact to achieve swing rotation and connect with the isolating switch or grounding switch. It is also called a rotary electrical connection. The transmission between the connecting rods drives the moving contact and the static contact to contact. Because the movement accuracy of the connecting rod is low, the transmission between multiple connecting rods will affect the stability of the transmission between switches. At the same time, the connecting rod structure takes up a lot of space, which is not conducive to reducing the size of the electrical cabinet and the compact design of the electrical cabinet.

[0003] At the same time, for environmental protection, the existing gas cabinets have replaced the previous insulating gas SF6 with air. The insulation performance of SF6 is three times that of air. Therefore, in order to keep the size of the gas cabinet unchanged, this environmentally friendly gas cabinet is designed to make the insulation performance of the environmentally friendly gas cabinet the same as that of SF6. Summary of the Invention

[0004] The purpose of the present invention is to provide an environmentally friendly gas cabinet, which controls the operating mechanism and adjusts the rotation of the crank arm assembly to extend and retract the first pull rod and the second pull rod. The first sealed rotating shaft and the second sealed rotating shaft are driven to rotate by the cooperation of the gear and the rack, so that the isolating switch assembly and the grounding switch assembly can be operated. The transmission accuracy of the gear and rack is high and stable, making the operation of the isolating switch assembly and the grounding switch assembly more stable.

[0005] The present invention provides the following technical solution: an environmentally friendly gas cabinet, comprising a gas cabinet body, the gas cabinet body comprising an operating mechanism, a circuit breaker gas chamber, a busbar gas chamber, a base and a secondary instrument chamber, characterized in that: the circuit breaker gas chamber is in an inverted "L" shape, the busbar gas chamber is located at the notch of the circuit breaker gas chamber, and clean air is filled in the circuit breaker gas chamber and the busbar gas chamber. It also includes a three-position switch, the three-position switch is arranged in the busbar gas chamber, and also includes two groups of insulating busbars for connecting the busbars of adjacent switch cabinets, the insulating busbars are arranged outside the rear end of the busbar gas chamber, and the two insulating busbars are connected to the main blade of the three-position switch through insulating sleeves, the three-position switch includes an isolating switch assembly and a grounding switch assembly, the grounding switch assembly is located on one side of the isolating switch assembly, and a first sealing shaft and a second sealing shaft are rotatably connected to the bottom surface of the busbar gas chamber. The rotating shaft, the first sealed rotating shaft is connected to the isolating switch assembly, the second sealed rotating shaft is connected to the grounding switch assembly, the grounding switch assembly is located on the outside of the isolating switch assembly, when the three-position switch needs to be grounded, the grounding switch assembly rotates and is connected to the isolating switch assembly, the lower end of the operating mechanism is connected to the crank arm assembly through the rotating shaft, the crank arm assembly includes a first crank arm and a second crank arm, the first crank arm is connected to the first pull rod, the second crank arm is connected to the second pull rod, the first pull rod is connected to the first pull rod rack, the lower end of the first sealed rotating shaft is connected to the first rotating gear, the first pull rod rack is meshed with the first rotating gear, the second pull rod is connected to the second pull rod rack, the lower end of the second sealed rotating shaft is connected to the second rotating gear, the second pull rod rack is meshed with the second rotating gear.

[0006] In order to control the forward and backward movement of the isolating moving contact, the isolating switch assembly includes a first transmission shaft and a second transmission shaft, the first transmission shaft and the second transmission shaft are distributed up and down, the first transmission shaft is connected to the upper end of the first sealed rotating shaft, the upper ends of the first transmission shaft and the second transmission shaft are both connected to a gear, a first sleeve is fixed on the inner wall of the busbar air chamber, an isolating sleeve is connected to the first sleeve, an isolating moving contact is inserted in the isolating sleeve, a moving contact inner rack is formed on the isolating moving contact, the moving contact inner rack is meshed with the gear, a second sleeve is fixed on the other inner wall of the busbar air chamber, the other end of the second sleeve is connected to the insulating busbar, the other end of the busbar is connected to the busbar contact, the busbar contact is connected to the isolating moving contact to conduct the circuit, a strip hole is opened on the side of the isolating sleeve, one side of the gear is embedded in the strip hole and meshes with the inner rack of the moving contact.

[0007] In order to ground the circuit, the grounding switch assembly includes a rotating shaft, which is connected to the second sealed rotating shaft. The other end of the rotating shaft is rotatably connected to the top wall of the busbar air chamber. A grounding knife is fixed on the rotating shaft, and a sleeve contact is formed on the isolation sleeve. The grounding knife contacts the sleeve contact for grounding.

[0008] Two tubular busbars and two current transformers are fixed on the top wall of the circuit breaker air chamber. A sealed pole is provided in the circuit breaker air chamber. The inner cone bushing of the tubular busbar is in the circuit breaker air chamber and is connected to the current transformer through a copper rod busbar. The current transformer is also connected to the sealed pole through a copper rod busbar. The other end of the sealed pole is connected to a first bushing through a copper rod busbar. The first bushing is connected to the other end of the busbar air chamber. A step for increasing the creepage distance is formed on the end of the first bushing in the circuit breaker air chamber.

[0009] In order to increase the creepage distance and improve the insulation performance of the tubular busbar and the current transformer, an inner cone bushing is installed at the lower end of the tubular busbar, and an shed for increasing the creepage distance is formed on the surface of the inner cone bushing.

[0010] In order to improve the insulation of the insulating busbar and avoid the insulation busbar from overlapping and shortening the electrical gap, the insulating busbar is a copper rod or a copper tube, and the outer surface of the insulating busbar is provided with an insulating layer.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) By controlling the operating mechanism and adjusting the rotation of the crank arm assembly, the first pull rod and the second pull rod are extended and retracted, and the first sealed rotating shaft and the second sealed rotating shaft are driven to rotate by the cooperation of the gear and the rack, so that the isolating switch assembly and the earthing switch assembly are operated. The transmission accuracy of the gear and the rack is high and stable, making the operation of the isolating switch assembly and the earthing switch assembly more stable;

[0013] (2) The grounding switch assembly is set on the side of the isolating switch assembly. The grounding knife rotates and contacts the sleeve contact on the isolating switch assembly by rotating the grounding transmission assembly to achieve grounding;

[0014] (3) The busbar gas chamber is set in the gap of the circuit breaker gas chamber, and the insulating busbar is set outside the busbar gas chamber. The insulating busbar does not occupy the space of the busbar gas chamber, leaving space for the disconnector assembly and the grounding switch assembly. By forming a boss on the surface of the first bushing, the creepage distance is increased and the insulation performance is improved. At the same time, the creepage distance on the inner cone bushing and the current transformer is increased, further improving the insulation performance, so that the insulation performance of the gas cabinet filled with clean air can be comparable to that of the SF6 gas cabinet. At the same time, the use of clean air makes the switch cabinet an environmentally friendly gas cabinet;

[0015] (4) The copper busbar is replaced with a copper rod, which reduces the electrical gap. At the same time, the surface of the copper rod has no sharp corners, which reduces the sharp corner discharge phenomenon. In addition, an insulating layer is installed on the insulating busbar to avoid the busbar overlap and reduce the electrical gap, thereby improving the insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a front view of the overall structure of the gas cabinet of the present invention;

[0018] Figure 2 is a schematic diagram of the internal structure of the gas cabinet of the present invention;

[0019] Figure 3 It is the connection structure between the busbar air chamber and the operating mechanism of the present invention;

[0020] Figure 4 This is a schematic diagram of the gas cabinet of the present invention in the isolation-closed and grounded-open states;

[0021] Figure 5 This is a schematic diagram of the gas cabinet of the present invention being located in the isolation section and the grounding section;

[0022] Figure 6 This is a schematic diagram of the gas cabinet of the present invention in the isolation-disconnected and grounded state;

[0023] Figure 7 This is a diagram showing the connection structure of the first crank arm and the second crank arm of the present invention;

[0024] In the figure: 11, first tie rod; 12, first tie rod rack; 13, first rotating gear; 14, first sealed rotating shaft; 15, first transmission shaft; 16, second transmission shaft; 17, first bushing; 18, isolation sleeve; 181, sleeve contact; 19, isolation moving contact; 191, moving contact inner rack; 110, gear; 111, busbar contact; 112, insulating busbar; 113, second bushing; 21, second tie rod; 22, second tie rod rack; 23. Second rotating gear; 24. Second sealed rotating shaft; 25. Rotating shaft; 26. Earthing knife; 31. First rotating shaft; 32. First crank arm; 33. Second rotating shaft; 34. Second crank arm; 35. Pin shaft; 4. Gas cabinet; 41. Operating mechanism; 42. Circuit breaker gas chamber; 421. Inner cone bushing; 422. Current transformer; 423. Sealed pole; 424. Tubular busbar; 43. Base; 44. Busbar gas chamber; 45. Secondary instrument room. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0026] See also Figures 1 to 2 The present invention provides a technical solution: an environmental protection gas cabinet, including a gas cabinet body 4, the gas cabinet body 4 includes an operating mechanism 41, a circuit breaker gas chamber 42, a busbar gas chamber 44, a base 43 and a secondary instrument chamber 45, the circuit breaker gas chamber 42 is in an inverted "L" shape, the busbar gas chamber 44 is located at the notch of the circuit breaker gas chamber 42, the circuit breaker gas chamber 42 and the busbar gas chamber 44 are filled with clean air, the clean air is composed of 20% oxygen and 80% nitrogen, and also includes a three-position switch, the three-position switch is arranged in the busbar gas chamber 44, and also includes two sets of insulating busbars 112 for connecting the busbars of adjacent switch cabinets, the insulating busbars 112 are arranged outside the rear end of the busbar gas chamber 44, and the two insulating busbars 112 are connected to the main blade of the three-position switch, the three-position switch includes an isolating switch The grounding switch assembly and the earthing switch assembly are located on one side of the isolating switch assembly. The first sealed rotating shaft 14 and the second sealed rotating shaft 24 are plugged into the bottom surface of the busbar air chamber 44. The first sealed rotating shaft 14 and the second sealed rotating shaft 24 can both rotate on the bottom surface of the busbar air chamber 44. The isolating switch assembly is connected to the first sealed rotating shaft 14, and the earthing switch assembly is connected to the second sealed rotating shaft 24. When the three-position switch needs to be grounded, the earthing switch assembly rotates and is connected to the isolating switch assembly. The lower end of the operating mechanism 41 is connected to the crank arm assembly through the rotating shaft. The crank arm assembly includes a first crank arm 32 and a second crank arm 34. The first crank arm 32 is connected to the operating mechanism 41 through the second rotating shaft 33, and the second crank arm 34 is connected to the operating mechanism 41 through the first rotating shaft 31. Figure 7As shown, the first crank arm 32 and the second crank arm 34 are fixed together by a pin 35, and the first crank arm 32 and the second crank arm 34 rotate together. The first pull rod 11 is hinged on the first crank arm 32, and the second pull rod 21 is hinged on the second crank arm 34. The end of the first pull rod 11 is connected to the first pull rod rack 12 through a pin, and the lower end of the first sealed rotating shaft 14 is connected to the first rotating gear 13. The first sealed rotating shaft 14 and the first rotating gear 13 rotate together, and the first pull rod rack 12 is engaged with the first rotating gear 13. The forward and backward extension of the first pull rod 11 will drive the extension and contraction of the first pull rod rack 12, further causing the first rotating gear 13 to rotate, driving the first sealed rotating shaft 14 and the isolating switch assembly are operating, a second pull rod rack 22 is hinged on the second pull rod 21, and the lower end of the second sealed rotating shaft 24 is connected to the second rotating gear 23, the second pull rod rack 22 is engaged with the second rotating gear 23, and the extension and retraction of the second pull rod 21 drives the second pull rod rack 22 to extend and retract, so that the second rotating gear 23 rotates, and further drives the second sealed rotating shaft 24 and the grounding switch assembly to operate, and by operating the operating mechanism 41, the rotation of the crank arm assembly is controlled to make the first pull rod 11 and the second pull rod 21 extend and retract, and the cooperation of the gear and the rack is used to push the first sealed rotating shaft 14 and the second sealed rotating shaft 24 to rotate, so that the isolating switch assembly and the grounding switch assembly can operate.

[0027] like Figure 3 and 4As shown, the isolating switch assembly includes a first transmission shaft 15 and a second transmission shaft 16, and the first transmission shaft 15 and the second transmission shaft 16 are distributed up and down. The first transmission shaft 15 is connected to the upper end of the first sealed rotating shaft 14 through a coupling, and the first transmission shaft 15 and the second transmission shaft 16 rotate together. The upper end of the first transmission shaft 15 and the upper end of the second transmission shaft 16 are both connected with a gear 110. A first sleeve 17 is fixed on the inner wall of the busbar air chamber 44, and an isolation sleeve 18 is connected to the first sleeve 17. An isolation moving contact 19 is inserted into the isolation sleeve 18, and a moving contact inner rack 191 is formed on the isolation moving contact 19. The moving contact inner rack 191 is engaged with the gear 110. The rotation of the first sealed rotating shaft 14 rotates the first transmission shaft 15 and the second transmission shaft 16, driving the two gears 110 to rotate, so that the isolation moving contact 19 moves back and forth. When the contact 19 contacts the busbar contact 111, the circuit is connected. When the isolating moving contact 19 is disconnected from the busbar contact 111, the circuit is disconnected. A second sleeve 113 is fixed on the other inner wall of the busbar air chamber 44. The first sleeve 17 and the second sleeve 113 are respectively located on the two side walls of the busbar air chamber 44 opposite to each other and on the same straight line. The other end of the second sleeve 113 is connected to the insulating busbar 112. The other end of the insulating busbar 112 is connected to the busbar contact 111. The busbar contact 111 is connected to the isolating moving contact 19 to conduct the circuit. A strip hole is provided on the side of the isolating sleeve 18. The strip hole connects the inner and outer sides of the isolating sleeve 18. One side of the gear 110 is embedded in the strip hole and meshes with the rack 191 inside the moving contact. The installation position of the gear 110 is positioned through the strip hole to ensure that the gear 110 and the rack 191 inside the moving contact are meshed.

[0028] like Figure 3 and 4 As shown, the grounding switch assembly includes a rotating shaft 25, which is connected to the second sealed rotating shaft 24. The rotation of the second sealed rotating shaft 24 will drive the rotating shaft 25 to rotate. The other end of the rotating shaft 25 is rotatably connected to the top wall of the busbar air chamber 44. A grounding knife 26 is fixed to the rotating shaft 25, and a sleeve contact 181 is formed on the isolation sleeve 18. The rotating shaft 25 will drive the grounding knife 26 to swing, so that the grounding knife 26 contacts the sleeve contact 181 for grounding.

[0029] Two tubular busbars 424 and two current transformers 422 are fixed on the top wall of the circuit breaker air chamber 42. A sealed pole 423 is provided in the circuit breaker air chamber 42. The inner cone sleeve of the tubular busbar 424 is in the circuit breaker air chamber 42 and is connected to the current transformer 422 through a copper bar busbar. The current transformer 422 is also connected to the sealed pole 423 through a copper bar busbar. The other end of the sealed pole 423 is connected to the first sleeve 17 through the copper bar busbar. The first sleeve 17 is connected to the other end of the busbar air chamber 44. The first sleeve 17 is formed with a portion for increasing the pressure on the end of the circuit breaker air chamber 42. The step of adding the surface distance increases the surface distance of the first bushing 17, increases the creepage distance, and improves the insulation performance. By arranging the insulating busbar 112 on the outside of the busbar gas chamber 44, the insulating busbar 112 does not occupy the space of the busbar gas chamber, leaving enough space for the three-position switch, so that there is enough distance between the busbar contact 111 of the second bushing 113 and the isolating moving contact 19 to ensure the insulation performance of the equipment. At the same time, the overall length of the first bushing 17 needs to be extended to meet the installation distance, further increasing the surface distance and creepage distance of the first bushing 17 and improving the insulation performance.

[0030] An inner cone sleeve 421 is installed at the lower end of the tubular busbar 424. An shed for increasing the creepage distance is formed on the surface of the inner cone sleeve 421, thereby extending the creepage distance of the inner cone sleeve 421 and further improving the insulation performance of the electrical cabinet.

[0031] The insulating busbar 112 is a copper rod. There are no sharp corners on the surface of the insulating busbar 112, so sharp corner discharge will not occur. At the same time, the circular diameter of the same area is minimized, so that the distance between the insulating busbars 112 is maximized, thereby increasing the electrical gap. The outer surface of the insulating busbar 112 is provided with an insulating layer. The insulating layer is utilized to enhance the insulation performance of the surface of the insulating busbar 112, thereby preventing the insulating busbar 112 from reducing the electrical gap between the insulating busbars 112 due to overlapping.

[0032] Because the environmental protection gas cabinet is filled with clean air, which is a mixture of 20% oxygen and 80% nitrogen, and the insulation performance of SF6 is three times that of clean air, in order to ensure the insulation performance of the environmental protection gas cabinet without changing the size of the gas cabinet, the insulating busbar is set on the outside of the busbar gas chamber so that the insulating busbar 112 does not occupy the space of the busbar gas chamber 44, providing sufficient space for the disconnector assembly and the grounding switch assembly, and also extending the surface distance of the first bushing, increasing the creepage distance, and improving the insulation performance; at the same time, the copper rod-shaped insulating busbar 112 is combined, and an umbrella skirt is added to the end face of the inner cone bushing 421 to improve the insulation performance.

[0033] Three-position switch operation:

[0034] like Figure 4As shown, in the first working position, the first pull rod is pushed under the busbar air chamber, the second pull rod is pulled out to the outside of the busbar air chamber, and the first pull rod is pushed into the bottom of the busbar air chamber. The first pull rod drives the first pull rod rack to extend inward, causing the first rotating shaft gear to rotate, driving the disconnector assembly to operate, causing the isolating movable contact to extend and connect with the busbar contact, thereby achieving circuit conduction;

[0035] like Figure 5 As shown, in another working position, the first pull rod is pulled out to the outside of the busbar air chamber, and the second pull rod is also pulled out to the outside of the busbar air chamber. The first pull rod drives the first pull rod rack to extend outward, causing the first rotating shaft gear to rotate, driving the disconnector assembly to operate, causing the isolating movable contact to move outward and insert into the isolating sleeve, and the isolating movable contact is separated from the busbar contact;

[0036] like Figure 6 As shown, at one working position, the second pull rod is pushed into the bottom of the busbar air chamber, and the second pull rod drives the second pull rod rack to move, so that the grounding transmission shaft rotates, and the grounding knife rotates to contact the sleeve contact to achieve grounding.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An environmentally friendly gas cabinet, comprising a gas cabinet body, the gas cabinet body including an operating mechanism, a circuit breaker gas chamber, a busbar gas chamber, a base, and a secondary instrument chamber, characterized in that: The circuit breaker air chamber is in an inverted "L" shape, the busbar air chamber is located at the notch of the circuit breaker air chamber, and clean air is filled in the circuit breaker air chamber and the busbar air chamber. It also includes a three-position switch, which is arranged in the busbar air chamber. It also includes two sets of insulating busbars for connecting the busbars of adjacent switch cabinets. The insulating busbars are arranged outside the rear end of the busbar air chamber, and the two sets of insulating busbars are connected to the main blade of the three-position switch through insulating sleeves. The three-position switch includes an isolating switch assembly and an earthing switch assembly. The earthing switch assembly is located on one side of the isolating switch assembly. A first sealed rotating shaft and a second sealed rotating shaft are rotatably connected to the bottom surface of the busbar air chamber. The isolating switch assembly is connected to the first sealed rotating shaft, and the second sealed rotating shaft is connected to the There is a grounding switch assembly, which is located on the outside of the isolating switch assembly. When the three-position switch needs to be grounded, the grounding switch assembly rotates and connects to the isolating switch assembly. The lower end of the operating mechanism is connected to a crank arm assembly through a rotating shaft. The crank arm assembly includes a first crank arm and a second crank arm. The first crank arm is connected to a first pull rod, and the second crank arm is connected to a second pull rod. The first pull rod is connected to a first pull rod rack, and the lower end of the first sealed rotating shaft is connected to a first rotating gear, and the first pull rod rack is meshed with the first rotating gear, and the second pull rod is connected to a second pull rod rack. The lower end of the second sealed rotating shaft is connected to a second rotating gear, and the second pull rod rack is meshed with the second rotating gear.

2. The environmental gas cabinet according to claim 1, characterized in that: The isolating switch assembly includes a first transmission shaft and a second transmission shaft, which are distributed up and down. The first transmission shaft is connected to the upper end of the first sealed rotating shaft, and the upper ends of the first transmission shaft and the second transmission shaft are both connected to a gear. A first sleeve is fixed on the inner wall of the busbar air chamber, and an isolating sleeve is connected to the first sleeve. An isolating moving contact is inserted in the isolating sleeve, and an inner rack of the moving contact is formed on the isolating moving contact. The inner rack of the moving contact is engaged with the gear. A second sleeve is fixed on the other inner wall of the busbar air chamber, and the other end of the second sleeve is connected to the insulating busbar. A busbar contact is connected to the other end of the busbar, and the busbar contact is connected to the isolating moving contact to conduct the circuit. A strip hole is opened on the side of the isolating sleeve, and one side of the gear is embedded in the strip hole and engaged with the inner rack of the moving contact.

3. The environmental gas cabinet according to claim 2, characterized in that: The grounding switch assembly includes a rotating shaft, which is connected to the second sealed rotating shaft. The other end of the rotating shaft is rotatably connected to the top wall of the busbar air chamber. A grounding knife is fixed on the rotating shaft, and a sleeve contact is formed on the isolation sleeve. The grounding knife contacts the sleeve contact to achieve grounding.

4. The environmental gas cabinet according to claim 2, characterized in that: Two tubular busbars and two current transformers are fixed on the top wall of the circuit breaker air chamber. A sealed pole is provided in the circuit breaker air chamber. The inner cone bushing of the tubular busbar is in the circuit breaker air chamber and is connected to the current transformer through a copper rod busbar. The current transformer is also connected to the sealed pole through a copper rod busbar. The other end of the sealed pole is connected to a first bushing through a copper rod busbar. The first bushing is connected to the other end of the busbar air chamber. A step for increasing the creepage distance is formed on the end of the first bushing in the circuit breaker air chamber.

5. The environmental gas cabinet according to claim 4, characterized in that: An inner cone sleeve is installed at the lower end of the tubular busbar, and an umbrella skirt for increasing the creepage distance is formed on the surface of the inner cone sleeve.

6. The environmental gas cabinet according to claim 1, characterized in that: The insulating busbar is a copper rod or a copper tube, and the outer surface of the insulating busbar is provided with an insulating layer.

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