Environmental protection cabinet casing

Abstract

The utility model relates to the technical field of high-voltage bushings, and discloses an environmental protection cabinet bushing, comprising a main body, one side of the main body is provided with a conductor high-voltage external connection end, the other side of the main body is provided with a conductor high-voltage internal connection end, two shielding nets are provided on the main body, an umbrella skirt is provided at the outer periphery of the main body near the other side, a protective skirt is provided at the other side of the main body, a mounting flange surface is provided at the middle position of the outer periphery of the main body, and a shielding net structure is adopted. One is used to indicate the charged state of a switch. When the high-voltage conductor is charged, an inductive capacitor generates a low-voltage electric signal. By connecting a high-voltage charged display, a prompt and warning effect is achieved, and the switch device does not need to be specially equipped with a high-voltage sensor; second, through the shielding net, an extremely non-uniform electric field is changed into a slightly non-uniform electric field, thereby reducing the electric field strength of the part, and the bushing can safely pass through a 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 bushings for environmental protection cabinets. Background Art

[0002] In the medium voltage distribution network, SF6 insulating medium is widely used in the ring network switchgear. As one of the six greenhouse gases, SF6 gas has attracted wide attention from all walks of life. my country has made energy conservation and emission reduction a national policy for sustainable development.

[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] The bushing of this environmental protection cabinet is designed to meet the requirements of the insulation performance of the outgoing line to the ground and between phases of the ring network cabinet that uses environmental protection gas as the external insulation medium.

[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] So we proposed an environmentally friendly cabinet casing to solve the above problems. Utility Model Content

[0011] The purpose of the utility model is to provide an environmental protection cabinet casing to solve the problems raised by the above background technology.

[0012] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an environmental protection cabinet bushing, comprising a main body, a conductor high-voltage external connection terminal is provided on one side of the main body, a conductor high-voltage internal connection terminal is provided on the other side of the main body, two shielding nets are provided on the main body, an umbrella skirt is provided on the outer periphery of the main body near the other side, a protective skirt is provided on the other side of the main body, and a mounting flange surface is provided at the middle position of the outer periphery of the main body.

[0013] Preferably, an epoxy resin insulation layer is provided on the periphery of the main body.

[0014] Preferably, the two shielding nets are arranged symmetrically up and down.

[0015] Preferably, a shielding net connecting nut for fixing the shielding net is installed near the middle position of the main body.

[0016] Preferably, a plurality of mounting nuts are installed on one side of the mounting flange surface, and the mounting nuts are arranged in a circular array with one side of the main body as the center.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 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.

[0019] 2. One end of the bushing is connected to the cable and accessories (conical surface), and the other end inside the cabinet is connected to the conductor loop. An umbrella skirt is designed between the mounting flange surface and the conductor end surface to increase the insulation margin along the surface. There is a skirt at the conductor end in the cabinet to act as a barrier insulation against the side panels and phases to ensure that the switchgear can operate reliably at zero gauge pressure, reducing the requirements for the cabinet, and can also operate safely for a long time in the event of an accidental leakage.

[0020] 3. Six M6 mounting nuts are required to fix the casing, which is easy and convenient to install. 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 through accurate dimensional control of the mold, which is conducive to the coordination of the switch cabinet and the circuit breaker, reduces the contact resistance and improves the interchangeability. In the whole scheme, it is equivalent to the original structure with good electrical performance, full functions, easy installation and high reliability.

[0021] 4. Control the local 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 product service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0023] Figure 2 It is a left side structural schematic diagram of the utility model;

[0024] Figure 3 It is a right side structural schematic diagram of the utility model.

[0025] In the figure: 1. Conductor high-voltage external connection terminal; 2. Epoxy resin insulation layer; 3. Shielding net; 4. Mounting flange surface; 5. Umbrella skirt; 6. Protective skirt; 7. Conductor high-voltage internal connection terminal; 8. Mounting nut; 9. Shielding net connecting nut; 10. Main body. DETAILED DESCRIPTION

[0026] 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.

[0027] The environmental protection cabinet bushing includes a main body 10, a conductor high-voltage external connection terminal 1 is arranged on one side of the main body 10, a conductor high-voltage internal connection terminal 7 is arranged on the other side of the main body 10, two shielding nets 3 are arranged on the main body 10, an umbrella skirt 5 is arranged near the other side of the outer periphery of the main body 10, a skirt 6 is arranged on the other side of the main body 10, and a mounting flange surface 4 is arranged at the middle position of the outer periphery of the main body 10. The main body 10 and the epoxy resin insulation layer 2 cooperate with the shielding net 3 to achieve the safe passage of the high-voltage conductor through the metal panel, fix the high-voltage conductor, and the shielding net 3 plays a role in shielding and uniform electric field. The shielding net 3 is directly grounded or connected to a secondary display and control device.

[0028] The outer periphery of the main body 10 is provided with an epoxy resin insulating layer 2 .

[0029] The two shielding nets 3 are arranged symmetrically up and down.

[0030] A shielding net connecting nut 9 for fixing the shielding net 3 is installed near the middle position of the main body 10 . The shielding net connecting nut 9 can be provided to facilitate fixing the shielding net 3 .

[0031] A plurality of mounting nuts 8 are mounted on one side of the mounting flange surface 4 . The mounting nuts 8 are arranged in a circular array with one side of the main body 10 as the center, so as to facilitate the connection of the main body 10 with the outside.

[0032] 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.

[0033] Since the dielectric constant of dry air itself is relatively low, through calculation and simulation, the length of the shielding net 3 along the high-voltage internal connection end is appropriately increased to improve 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. The height of the epoxy resin in the bushing cabinet is increased (relative to the inflatable cabinet bushing), and the umbrella skirt 5 and skirt 6 are reasonably designed to improve the withstand voltage level of the phases and the ground (mainly the side panels) in the bushing cabinet, meet the miniaturization requirements, and reduce the probability of failure.

[0034] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0035] 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. An environmental protection cabinet casing, comprising a main body (10), characterized in that: A conductor high-voltage external connection terminal (1) is provided on one side of the main body (10), a conductor high-voltage internal connection terminal (7) is provided on the other side of the main body (10), two shielding nets (3) are provided on the main body (10), an umbrella skirt (5) is provided on the outer periphery of the main body (10) near the other side, a protective skirt (6) is provided on the other side of the main body (10), and a mounting flange surface (4) is provided at the middle position of the outer periphery of the main body (10).

2. The environmental protection cabinet casing according to claim 1, characterized in that: An epoxy resin insulation layer (2) is provided on the outer periphery of the main body (10).

3. The environmental protection cabinet casing according to claim 1, characterized in that: The two shielding nets (3) are arranged symmetrically up and down.

4. The environmental protection cabinet casing according to claim 1, characterized in that: A shielding net connecting nut (9) for fixing the shielding net (3) is installed near the middle position of the main body (10).

5. The environmental protection cabinet casing according to claim 1, characterized in that: A plurality of mounting nuts (8) are mounted on one side of the mounting flange surface (4), and the mounting nuts (8) are arranged in a circular array with one side of the main body (10) as the center.

Images