Wall bushing with fully fluidized conductor

Abstract

The utility model provides a wall bushing with fully fluidized conductors, and belongs to the technical field of high-voltage insulation. Comprising a sleeve body, a high-voltage shielding cylinder, a low-voltage shielding cylinder, a high-voltage lead and a set of metal fixing buckles, the high-voltage shielding cylinder is arranged in the side wall of the middle of the sleeve body, the low-voltage shielding cylinder is coaxially arranged on the outer side of the high-voltage shielding cylinder, a high-voltage lead terminal and a grounding terminal are arranged in the sleeve body, and the high-voltage lead terminal is connected with the high-voltage shielding cylinder. The grounding terminal is connected with the low-voltage shielding cylinder, an installation hole is formed in the outer wall of the bushing body, a fixing nut is fixedly installed on the installation hole, a bus copper bar penetrates through the hollow cylinder of the wall bushing, and the high-voltage lead is connected with the high-voltage lead terminal and the bus copper bar. Conductive parts in the wall bushing with the fully fluidized conductor are provided with fluidization layers and refer to a high-voltage shielding cylinder, a low-voltage shielding cylinder, a metal fixing buckle, a metal connecting piece and a high-voltage lead.

Description

Technical Field

[0001] The utility model relates to the technical field of high voltage insulation, in particular to a wall bushing with fully fluidized conductors. Background Art

[0002] The wall bushing of the switch cabinet equipment will be damaged due to partial discharge during use, resulting in reduced insulation capacity. In the typical double-shielded switch cabinet wall bushing structure on the market, the low-voltage shielding net is installed near the middle of the bushing wall and is reliably grounded through the installation nut. In this double-shielded bushing design, the main function of the double shielding composed of low-voltage shielding and high-voltage shielding is to limit the main electric field distribution in the epoxy casting layer to increase the electric field strength in the epoxy resin and reduce the field strength in the air, so that the electric field distribution is more reasonable. However, due to the intermittent power generation process of the new energy station, the busbar current changes, resulting in changes in the temperature field inside the switch air chamber, which is easy to form condensation on the inner surface of the high-voltage shield, resulting in insulation discharge of condensation water droplets on the inner surface of the bushing, affecting the insulation performance of the switch cabinet. As the discharge time increases, the discharge situation gradually becomes more serious, and eventually leads to the breakdown of the main insulation of the bushing. Utility Model Content

[0003] In view of this, the utility model provides a wall bushing with a fully fluidized conductor, which improves the insulation strength of the conductive parts by covering the conductive parts in the bushing structure with an insulating coating, thereby achieving the effect of improving the insulation performance in the wall bushing.

[0004] The technical solution adopted by the embodiment of the utility model to solve the technical problem is:

[0005] A wall bushing with fully fluidized conductor, characterized in that the conductive parts in the wall bushing with fully fluidized conductor have a fluidized layer, the conductive parts refer to a high-voltage shielding tube, a low-voltage shielding tube, a metal fixing buckle, a metal connector and a high-voltage lead, and the high-voltage lead is a bare lead and has no insulating wrapping layer on the surface.

[0006] Preferably, the conductor fully fluidized wall bushing includes a bushing body, a high-voltage shielding tube, a low-voltage shielding tube, a high-voltage lead, a metal connector and a group of metal fixing buckles, the high-voltage shielding tube is arranged in the middle side wall of the bushing body, the low-voltage shielding tube is coaxially arranged on the outside of the high-voltage shielding tube, a high-voltage lead terminal and a grounding terminal are arranged inside the bushing body, the high-voltage lead terminal is connected to the high-voltage shielding tube, the two ends of the metal connector are connected to the grounding terminal and the low-voltage shielding tube, a mounting hole is provided on the outer wall of the bushing body, a fixing nut is fixedly installed on the mounting hole, the busbar copper bar is passed through the hollow tube of the wall bushing, and the high-voltage lead connects the high-voltage lead terminal and the busbar copper bar;

[0007] Preferably, the overlapping surfaces and equipotential connections of the high-voltage shielding tube and the low-voltage shielding tube do not have a fluidized layer.

[0008] Preferably, the fluidized layer of each of the conductive parts is made of insulating material.

[0009] Preferably, the material of the fluidized layer is epoxy resin powder.

[0010] Preferably, the fluidized layer has a thickness range of 1.2 to 1.7 mm.

[0011] Preferably, the high-voltage leads are fixed by a group of the metal fixing buckles and are all placed within the cylindrical high-voltage shielding area formed by the high-voltage shielding tube and do not touch the edge of the cylindrical high-voltage shielding area.

[0012] Preferably, the bushing body is cast from epoxy resin, an insulating layer is provided between the high-voltage shielding tube and the low-voltage shielding tube, and the high-voltage shielding area is larger than the low-voltage shielding area.

[0013] It can be known from the above technical scheme that the wall bushing with fully fluidized conductor provided by the embodiment of the utility model belongs to the field of high voltage insulation technology. It includes: a bushing body, a high-voltage shielding tube, a low-voltage shielding tube, a high-voltage lead, a metal connector and a group of metal fixing buckles. The high-voltage shielding tube is arranged in the middle side wall of the bushing body, and the low-voltage shielding tube is coaxially arranged outside the high-voltage shielding tube. The bushing body is provided with a high-voltage lead terminal and a grounding terminal. The high-voltage lead terminal is connected to the high-voltage shielding tube. The two ends of the metal connector are connected to the grounding terminal and the low-voltage shielding tube. A mounting hole is provided on the outer wall of the bushing body, and a fixing nut is fixedly installed on the mounting hole. The busbar copper bar is passed through the hollow tube of the wall bushing, and the high-voltage lead connects the high-voltage lead terminal and the busbar copper bar. The conductive parts in the wall bushing with fully fluidized conductor have a fluidized layer, and the conductive parts refer to the high-voltage shielding tube, the low-voltage shielding tube, the metal fixing buckle, the metal connector and the high-voltage lead. The utility model increases the insulation strength of the conductive parts by covering the conductive parts in the bushing structure with a layer of insulating coating, thereby achieving the effect of improving the insulation performance in the wall bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural diagram of the conductor fully fluidized wall bushing.

[0015] Figure 2 This is a schematic diagram of the installation position of the switch cabinet wall bushing.

[0016] Figure 3 Schematic diagram of the connection between a busbar with fully fluidized conductors and a fluidized layer.

[0017] In the figure: 1-busbar, 2-wall bushing, 21-high-voltage shielding tube, 22-low-voltage shielding tube, 23-metal fixing buckle, 24-high-voltage lead, 25-epoxy resin, 26-fixing nut, 27-metal connector, 28-high-voltage shielding range. DETAILED DESCRIPTION

[0018] The technical solution and technical effects of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0019] The utility model provides a wall bushing with fully fluidized conductors. A layer of insulating coating is coated on the surface of conductive parts such as the inner shield of the bushing in the bushing structure, which can reduce flashover on the inner surface of the bushing.

[0020] refer to Figure 1 As shown, the conductor fully fluidized wall bushing provided by the utility model includes a bushing body, a high-voltage shielding tube, a low-voltage shielding tube, a high-voltage lead, a metal connector and a group of metal fixing buckles. The high-voltage shielding tube is arranged in the middle side wall of the bushing body, and the low-voltage shielding tube is coaxially arranged outside the high-voltage shielding tube. The bushing body is provided with a high-voltage lead terminal and a grounding terminal. The high-voltage lead terminal is connected to the high-voltage shielding tube. The two ends of the metal connector are connected to the grounding terminal and the low-voltage shielding tube. A mounting hole is provided on the outer wall of the bushing body, and a fixing nut is fixedly installed on the mounting hole. The busbar copper bar is passed through the hollow tube of the wall bushing, and the high-voltage lead connects the high-voltage lead terminal and the busbar copper bar; the high-voltage lead is fixed by a group of metal fixing buckles and is all placed within the cylindrical high-voltage shielding area formed by the high-voltage shielding tube and does not touch the edge of the cylindrical high-voltage shielding area. Referring to the example in the attached figure, the positions of the metal fixing buckles are respectively located at the busbar and the high-voltage lead terminal.

[0021] The bushing body is cast by epoxy resin, an insulating layer is provided between the high-voltage shielding tube and the low-voltage shielding tube, and the range of the high-voltage shielding area is larger than that of the low-voltage shielding area.

[0022] In order to improve the insulation performance of the wall bushing, the conductive parts in the wall bushing with fully fluidized conductors have a fluidized layer. The conductive parts refer to the high-voltage shielding tube, low-voltage shielding tube, metal fixing buckle, metal connector and high-voltage lead. The overlapping surface and equipotential connection of the high-voltage shielding tube and the low-voltage shielding tube do not have a fluidized layer. The high-voltage lead here uses a bare lead, which is different from the ordinary lead with an easily peelable insulating wrapping layer on the surface.

[0023] The fluidized layer of each conductive part is made of insulating material, and the material of the fluidized layer is epoxy resin powder; preferably, the thickness of the fluidized layer is in the range of 1.2 to 1.7 mm.

[0024] The method for preparing a wall bushing with fully fluidized conductor is as follows:

[0025] Step S11, pre-treating the conductive parts of the wall bushing to obtain conductive parts with coating conditions on the surface, the pre-treatment includes cleaning and rust removal. Surface cleaning refers to dust removal, oil removal, rust removal and other pollutants to ensure that the surface is free of oil and rust. Chemical cleaning and physical methods (such as sandblasting) can be used to increase the surface roughness to improve the adhesion of the coating;

[0026] Step S12, using a high temperature resistant adhesive tape to cover the overlapping surfaces and equipotential connection points of the conductor parts;

[0027] Step S13, setting fluidization treatment conditions, the fluidization treatment conditions including the insulating powder used for fluidization, preheating temperature control, fluidization thickness, dipping time, curing temperature and curing time;

[0028] Step S14, preheating the conductor parts according to the fluidized treatment conditions, and immersing them in a fluidized bed in which insulating powder is suspended for fluidized treatment, so as to obtain a busbar with a fluidized layer and a conductor part with a fluidized layer required for the lifting wall bushing;

[0029] Step S15, removing the high temperature resistant adhesive tape on the conductor part with the fluidized layer;

[0030] Step S16, assembling the lifting type wall bushing using the conductor parts and non-conductor parts after the fluidization treatment.

[0031] In the utility model, the selected high temperature resistant adhesive tape has tensile properties, certain tensile strength and moderate viscosity. Before fluidized treatment, the purpose of coating the overlapping surfaces and equipotential connection points of the conductor parts is to retain the conductivity of these positions.

[0032] The material of insulating powder is epoxy resin powder, which is mainly composed of epoxy resin, curing agent, pigment, additives, etc.

[0033] Fluidization conditions:

[0034] The preheating temperature of the conductor workpiece in the fluidized bed treatment is higher than the melting temperature of the insulating powder, and the preheating temperature range is 190~195℃.

[0035] The dipping time interval of the fluidized bed treatment is 25~45s; the curing temperature of the fluidized bed treatment is set to 185°C, and the curing time interval is 35~50min.

[0036] The thickness of the fluidized layer of the conductor parts ranges from 1.2 to 1.7 mm.

[0037] Step S14 is a metal fluidization process for the busbar and metal conductive parts, which is a surface treatment technology for improving shielding effect and corrosion resistance, and is specifically implemented as follows:

[0038] Step S141, using a fluidized bed method, a compressed gas of a certain pressure is input into the bottom chamber of the fluidized bed tank, and the compressed gas forms a uniform upward blowing airflow in the upper chamber of the tank through the air permeable plate, so that the insulating powder accumulated in the fluidized bed tank is loosened and generates an omnidirectional flow to be suspended. After reaching a certain suspension height, a stable fluidized suspended insulating powder layer is formed; the compressed gas is clean air, carbon dioxide or nitrogen;

[0039] Step S142, preheating the conductor part in a preheating furnace so that the temperature of the conductor part as a whole reaches a preheating temperature range to form a heated conductor part; preheating helps to improve the adhesion and uniformity of the coating;

[0040] Step S143, using a sleeve-type fixture, vertically immerse the heated conductor part into the suspended insulating powder layer in the fluidized state in step S141, and evenly move the sleeve-type fixture and the heated conductor part through the fixture hook, so that the heated conductor part intermittently hits the inner wall of the fluidizing tank and turns the part over many times, so that the insulating powder is continuously melted and adheres to the surface of the heated conductor part, and gradually melts into a viscous insulating liquid, which is cast and infiltrated on the surface of the heated conductor part, so as to obtain a conductor part with an insulating surface layer;

[0041] Step S144, transfer the conductor parts with the insulating surface layer into a post-processing baking furnace for curing; after the curing is completed, allow the conductor parts to cool naturally in a controlled environment to obtain a busbar with a fluidized layer and a conductor part with a fluidized layer required for the lifting type wall bushing.

[0042] Step S145, checking the uniformity and integrity of the coating, and performing local repair or re-coating treatment on defective or uneven parts.

[0043] Through the scheme of the utility model, the conductive parts in the bushing structure are covered with an insulating coating, the insulation strength of the conductive parts is improved, and the effect of improving the insulation performance in the wall bushing is achieved.

[0044] The above disclosure is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. A wall bushing with fully fluidized conductor, characterized in that: The conductive parts in the wall bushing with fully fluidized conductor have a fluidized layer. The conductive parts refer to high-voltage shielding tube, low-voltage shielding tube, metal fixing buckles, metal connectors and high-voltage leads. The high-voltage leads are bare leads and have no insulating wrapping layer on the surface.

2. The conductor fully fluidized wall bushing according to claim 1, characterized in that: The conductor fully fluidized wall bushing includes a bushing body, a high-voltage shielding tube, a low-voltage shielding tube, a high-voltage lead, a metal connector and a group of metal fixing buckles. The high-voltage shielding tube is arranged in the middle side wall of the bushing body, and the low-voltage shielding tube is coaxially arranged on the outside of the high-voltage shielding tube. A high-voltage lead terminal and a grounding terminal are arranged inside the bushing body. The high-voltage lead terminal is connected to the high-voltage shielding tube, and the two ends of the metal connector are connected to the grounding terminal and the low-voltage shielding tube. An installation hole is opened on the outer wall of the bushing body, and a fixing nut is fixedly installed on the installation hole. The busbar copper bar passes through the hollow tube of the wall bushing, and the high-voltage lead connects the high-voltage lead terminal and the busbar copper bar.

3. The conductor fully fluidized wall bushing according to claim 2, characterized in that: The overlapping surfaces and equipotential connection points of the high-voltage shielding cylinder and the low-voltage shielding cylinder do not have a fluidized layer.

4. The conductor fully fluidized wall bushing according to claim 3, characterized in that: The fluidized layer of each conductive part is made of insulating material.

5. The conductor fully fluidized wall bushing according to claim 4, characterized in that: The material of the fluidized layer is epoxy resin powder.

6. The conductor fully fluidized wall bushing according to claim 5, characterized in that: The thickness of the fluidized layer is in the range of 1.2 to 1.7 mm.

7. The conductor fully fluidized wall bushing according to claim 6, characterized in that: The high-voltage leads are fixed by a group of metal fixing buckles and are all placed within the cylindrical high-voltage shielding area formed by the high-voltage shielding tube and do not touch the edge of the cylindrical high-voltage shielding area.

8. The conductor fully fluidized wall bushing according to claim 7, characterized in that: The bushing body is cast by epoxy resin, an insulating layer is provided between the high-voltage shielding tube and the low-voltage shielding tube, and the range of the high-voltage shielding area is larger than that of the low-voltage shielding area.

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