Explosion-proof environment-friendly cabinet surface metal grounding bus connecting sleeve

Abstract

The utility model relates to the technical field of high-voltage bushings, and discloses an explosion-proof environment-friendly cabinet surface metal grounding bus connecting bushing, which comprises an epoxy resin insulating main body, a conducting rod is arranged in an inner cavity of the epoxy resin insulating main body in a penetrating manner, and two shielding nets are arranged in the inner cavity of the epoxy resin insulating main body close to the middle position. The two shielding nets are arranged up and down, an explosion-proof layer mounting surface is arranged on the periphery of the epoxy resin insulation main body close to the middle position, the shielding net structure is adopted, one shielding net is used for indicating the electrification state of the switch, when a high-voltage conductor is electrified, the induction capacitor generates a low-voltage electric signal, and the prompting and warning effects are achieved by connecting a high-voltage electrification display; the switch equipment does not need to be specially configured with a high-voltage sensor; and secondly, an extremely non-uniform electric field is changed into a slightly non-uniform electric field through the shielding net, the electric field intensity of the part is reduced, and the sleeve can safely penetrate through the metal plate due to the shielding effect.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage bushings, in particular to a metal grounding busbar connecting bushing on the surface of an explosion-proof environmental protection cabinet. Background Art

[0002] In medium-voltage distribution network ring network switchgear, SF6 insulating medium is widely used. As one of the six greenhouse gases, SF6 gas has attracted widespread attention from all walks of life.

[0003] The ring main unit that uses environmentally friendly gases such as dry air as the external insulating medium is developed to replace SF6 insulated switchgear equipment to meet the requirements of use in harsh environmental conditions. Its structural features: the entire conductive circuit of the switch is sealed in a box filled with environmentally friendly gas, and connected to the high-voltage line through a bushing. The operation of the switch is not affected by external conditions, such as plateau areas, dirty and humid areas, etc., achieving good environmental resistance.

[0004] This surface metal grounding busbar connection sleeve is designed to meet the requirements of the ground and phase insulation performance of the ring network cabinet outlet using environmentally friendly gas as the external insulation medium. At the same time, it also meets the special requirements of explosion-proof switches such as flammability and high-intensity impact.

[0005] The main drawbacks of the traditional solution:

[0006] 1. SF6 is one of the gases that is explicitly banned by the Kyoto Protocol, and it has a significant greenhouse effect;

[0007] 2. Using SF6 as the external insulating medium, due to its high dielectric strength, the distance between the high voltage and the ground can be designed to be small. If the box leaks (strictly speaking, it is not completely sealed, but the leakage rate is different), it is easy to break through the ground;

[0008] 3. The conductive circuit connection requirements in the box are high (SF6 interface effect is obvious);

[0009] 4. The box is filled with SF6 at a certain pressure, which places high demands on the quality of the box itself.

[0010] Therefore, we proposed a metal grounding busbar connection sleeve on the surface of an explosion-proof environmental protection cabinet to solve the above-mentioned problems. Utility Model Content

[0011] The utility model aims to provide a metal grounding busbar connecting sleeve on the surface of an explosion-proof environmental protection cabinet to solve the problems raised by the above-mentioned background technology.

[0012] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a metal grounding busbar connecting sleeve on the surface of an explosion-proof environmental protection cabinet, comprising an epoxy resin insulating body, an inner cavity of the epoxy resin insulating body being penetrated by a conductive rod, two shielding nets being arranged near the middle position of the inner cavity of the epoxy resin insulating body, the two shielding nets being arranged up and down, an explosion-proof layer mounting surface being arranged near the middle position on the outer periphery of the epoxy resin insulating body, a first metal grounding layer being arranged on the outer periphery of the epoxy resin insulating body on one side of the explosion-proof layer mounting surface, a second metal grounding layer being arranged on the outer periphery of the epoxy resin insulating body on the other side of the explosion-proof layer mounting surface, and a switch cabinet mounting surface being arranged near the middle position on the outer periphery of the epoxy resin insulating body.

[0013] Preferably, a plurality of mounting holes are provided on one side of the mounting surface of the explosion-proof layer.

[0014] Preferably, the plurality of mounting holes are arranged in a circular array with the center position of the conductive rod as the center.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The shielding net structure is used to indicate the charged state of the switch. When the high-voltage conductor is charged, the inductive capacitor generates a low-voltage electrical signal. By connecting the high-voltage charged display, it can achieve the prompt and warning function. The switch equipment does not need to be specially equipped with a high-voltage sensor; secondly, through the shielding net, the extremely uneven electric field is changed into a slightly uneven electric field, reducing the electric field strength at this part. Due to the shielding effect, the casing can safely pass through the metal plate.

[0017] 2. One end of the bushing is connected to the main busbar, and the other end inside the cabinet is connected to the conductor loop. A special protective sheath is added between the metal grounding layer and the conductor end face to ensure that the switchgear can operate reliably at zero gauge pressure, reduce the requirements for the cabinet, and can also operate safely for a long time in the event of an accidental leakage.

[0018] 3. The bushing is fixed to the box body by bolts to ensure sufficient installation strength. Due to the use of epoxy resin automatic pressure gel molding process (APG), the overall mechanical properties are significantly improved. The dimensional accuracy of the product is improved by accurate size control of the mold, which is conducive to the coordination of the switch cabinet and the circuit breaker, reduces contact resistance and improves interchangeability. In the whole scheme, it is equivalent to the original structure with good electrical performance, full functions, easy installation and high reliability.

[0019] 4. Control the partial discharge of high-voltage conductors to the ground (mounting nuts, mounting plates) and metal shielding layers during production, reduce electrical aging of insulators, and greatly increase the service life of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0021] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0022] Figure 3 It is a left side view schematic diagram of the utility model.

[0023] In the figure: 1. Epoxy resin insulation body; 2. Conductive rod; 3. Shielding net; 4. First metal grounding layer; 5. Second metal grounding layer; 6. Switch cabinet installation surface; 7. Explosion-proof layer installation surface; 8. Installation hole. 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 metal grounding busbar connecting sleeve on the surface of the explosion-proof environmental protection cabinet comprises an epoxy resin insulating body 1, the inner cavity of the epoxy resin insulating body 1 is penetrated by a conductive rod 2, two shielding nets 3 are arranged near the middle position of the inner cavity of the epoxy resin insulating body 1, and the two shielding nets 3 are arranged up and down. An explosion-proof layer installation surface 7 is arranged near the middle position of the outer periphery of the epoxy resin insulating body 1, a first metal grounding layer 4 is arranged on the outer periphery of the epoxy resin insulating body 1 on one side of the explosion-proof layer installation surface 7, and a second metal grounding layer 5 is arranged on the outer periphery of the epoxy resin insulating body 1 on the other side of the explosion-proof layer installation surface 7. A switch cabinet installation surface 6 is arranged near the middle position of the outer periphery of the epoxy resin insulating body 1, and the sleeve insulating body and the shielding net 3 are relied on to achieve the safe passage of the high-voltage conductor through the metal panel, which plays a fixing role on the high-voltage conductor, and the shielding net 3 plays a role of shielding and uniform electric field, and the shielding net 3 is directly grounded or connected to a secondary display and control device.

[0026] A plurality of mounting holes 8 are provided on one side of the explosion-proof layer mounting surface 7, and the plurality of mounting holes 8 are provided to facilitate connection with the outside world.

[0027] A plurality of mounting holes 8 are arranged in a circular array with the center of the conductive rod 2 as the center.

[0028] Working principle: When a conductor passes through a metal mounting surface, an extremely non-uniform electric field is created, and a certain distance from the ground is required. A shielding layer is used to convert the extremely non-uniform electric field into a slightly non-uniform electric field, thereby reducing the electric field strength and increasing the safety margin. At the same time, the shielding layer generates a secondary induction signal, which can be directly grounded or connected to a secondary display or controller.

[0029] Since the dielectric constant of dry air itself is low, through calculation and simulation, the length of the shielding net 3 along the high-voltage internal connection end is appropriately increased to increase the flashover discharge voltage during the surface power frequency withstand voltage. The electric field structure is adjusted by the shielding net 3 to reduce the overall electric field strength at the switch connection end to meet the electrical performance requirements. Through the shielding effect of the metal layer on the surface of the epoxy resin, the withstand voltage level of some phases and the ground (mainly the side plate) in the switch circuit bushing cabinet is met, the miniaturization requirements are met, and the probability of failure is reduced.

[0030] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A metal grounding busbar connecting sleeve on the surface of an explosion-proof environmental protection cabinet, comprising an epoxy resin insulating body (1), characterized in that: The inner cavity of the epoxy resin insulating body (1) is penetrated by a conductive rod (2); two shielding nets (3) are arranged near the middle of the inner cavity of the epoxy resin insulating body (1); the two shielding nets (3) are arranged up and down; an explosion-proof layer installation surface (7) is arranged near the middle of the outer periphery of the epoxy resin insulating body (1); a first metal grounding layer (4) is arranged on the outer periphery of the epoxy resin insulating body (1) located on one side of the explosion-proof layer installation surface (7); a second metal grounding layer (5) is arranged on the outer periphery of the epoxy resin insulating body (1) located on the other side of the explosion-proof layer installation surface (7); and a switch cabinet installation surface (6) is arranged near the middle of the outer periphery of the epoxy resin insulating body (1).

2. The metal grounding busbar connecting sleeve on the surface of the explosion-proof environmental protection cabinet according to claim 1 is characterized in that: A plurality of mounting holes (8) are provided on one side of the explosion-proof layer mounting surface (7).

3. The metal grounding busbar connecting sleeve on the surface of the explosion-proof environmental protection cabinet according to claim 2 is characterized in that: The plurality of mounting holes (8) are arranged in a circular array with the center of the conductive rod (2) as the center.

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