Explosion-proof environment-friendly cabinet outgoing line sleeve

Abstract

The utility model discloses an explosion-proof type environment-friendly cabinet outgoing line sleeve, which comprises an epoxy resin main body, a shielding net, an explosion-proof layer mounting surface, a nut, a switch cabinet sealing layer mounting surface, a nut and a shielding net connecting nut, and is characterized in that the epoxy resin main body comprises an A-phase conductor, a B-phase conductor and a C-phase conductor. The inductive capacitor is used for indicating the electrification state of the switch, when the high-voltage conductor is electrified, the inductive capacitor generates a low-voltage electric signal and is connected with a high-voltage electrification display, so that the prompting and warning effects are achieved, and the switch equipment does not need to be specially provided 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 an explosion-proof environmental protection cabinet outlet bushing. 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 needs of adapting to harsh environmental conditions. Its structural features: the entire conductive circuit of the switch is sealed in a box filled with environmentally friendly gas, connected to the high-voltage line through a bushing, and 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 main drawbacks of the traditional solution:

[0005] 1. SF6 is one of the gases that is explicitly banned by the Kyoto Protocol, and it has a significant greenhouse effect;

[0006] 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;

[0007] 3. The conductive circuit connection requirements in the box are high (SF6 interface effect is obvious);

[0008] 4. The box is filled with SF6 at a certain pressure, which places high demands on the quality of the box itself. Utility Model Content

[0009] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide an explosion-proof environmental protection cabinet outlet bushing.

[0010] One of the purposes of the utility model is achieved by the following technical solution:

[0011] The explosion-proof environmental protection cabinet outlet bushing comprises an epoxy resin body, a shielding net, an explosion-proof layer mounting surface and nuts, a switch cabinet sealing layer mounting surface and nuts and a shielding net connecting nut. The epoxy resin body comprises an A-phase conductor, a B-phase conductor and a C-phase conductor. The shielding net is mounted on the epoxy resin body through a shielding net connecting nut. The explosion-proof layer mounting surface and nuts are arranged on the right side of the epoxy resin body, and the switch cabinet sealing layer mounting surface and nuts are arranged on the left side of the epoxy resin body.

[0012] Furthermore, the A-phase conductor, the B-phase conductor and the C-phase conductor are of equal size and are arranged at equal distances.

[0013] Furthermore, three groups of nuts are provided on the explosion-proof layer mounting surface and nuts and the switch cabinet sealing layer mounting surface and nuts.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 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.

[0016] 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. A sufficient creepage distance is maintained between the mounting flange surface and the conductor end surface 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.

[0017] 3. The bushing is fixed to the box body by three sets of M8 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 through accurate size control of the mold, which is beneficial to the coordination with the switch cabinet and circuit breaker, reducing contact resistance and improving interchangeability. In the whole scheme, it is equivalent to the original structure with good electrical performance, full functions, easy installation and high reliability.

[0018] 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.

[0019] 5. The rated voltage of this busbar bushing is 12kV, and the current value is 630A and 1250A to meet the needs of ring network power supply in cities, factories, etc.

[0020] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional diagram of this embodiment;

[0022] Figure 2 This is a schematic diagram of the main structure of this embodiment;

[0023] Figure 3 It is the front view of this embodiment;

[0024] Figure 4 It is a left side view of this embodiment;

[0025] Figure 5 It is a right side view of this embodiment.

[0026] In the figure: 1. A-phase conductor; 2. B-phase conductor; 3. C-phase conductor; 4. Epoxy resin body; 5. Shielding net; 6. Explosion-proof layer mounting surface and nuts; 7. Switch cabinet sealing layer mounting surface and nuts; 8. Shielding net connecting nuts. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0028] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] See also Figures 1 to 5The explosion-proof environmental protection cabinet outlet bushing includes an epoxy resin body 4, a shielding net 5, an explosion-proof layer mounting surface and a nut 6, a switch cabinet sealing layer mounting surface and a nut 7 and a shielding net connecting nut 8. The epoxy resin body 4 includes an A-phase conductor 1, a B-phase conductor 2 and a C-phase conductor 3. The A-phase conductor 1, the B-phase conductor 2 and the C-phase conductor 3 are of equal size and equidistantly arranged. The shielding net 5 is installed on the epoxy resin body 4 through the shielding net connecting nut 8. The explosion-proof layer mounting surface and the nut 6 are arranged on the right side of the epoxy resin body 4, and the switch cabinet sealing layer mounting surface and the nut 7 are arranged on the left side of the epoxy resin body 4. There are three groups of nuts on the explosion-proof layer mounting surface and the nut 6 and the switch cabinet sealing layer mounting surface and the nut 7.

[0031] Working principle: When the utility model is in use, the conductor passes through the metal mounting surface, which is an extremely non-uniform electric field and requires a certain distance from the ground. The shielding layer is used to change the extremely non-uniform electric field into a slightly non-uniform electric field, reduce the electric field strength, and improve 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. Since the dielectric constant of dry air itself is relatively low, through calculation and simulation, the length of the shielding net 5 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 5 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 withstand voltage level between the phases and the ground (mainly the side panels) in the bushing cabinet is improved to meet the miniaturization requirements and reduce the probability of failure.

[0032] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An explosion-proof environmental protection cabinet outlet bushing, comprising an epoxy resin body (4), a shielding net (5), an explosion-proof layer mounting surface and nuts (6), a switch cabinet sealing layer mounting surface and nuts (7) and a shielding net connecting nut (8), characterized in that: The epoxy resin body (4) comprises an A-phase conductor (1), a B-phase conductor (2) and a C-phase conductor (3); the shielding net (5) is mounted on the epoxy resin body (4) via a shielding net connecting nut (8); the explosion-proof layer mounting surface and the nut (6) are arranged on the right side of the epoxy resin body (4); and the switch cabinet sealing layer mounting surface and the nut (7) are arranged on the left side of the epoxy resin body (4).

2. The explosion-proof environmental protection cabinet outlet bushing according to claim 1, characterized in that: The A-phase conductor (1), the B-phase conductor (2) and the C-phase conductor (3) are of equal size and are arranged at equal distances.

3. The explosion-proof environmental protection cabinet outlet bushing according to claim 1, characterized in that: Three groups of nuts are provided on the explosion-proof layer mounting surface and nuts (6) and the switch cabinet sealing layer mounting surface and nuts (7).

Images