All-insulation shielding bus connection system for gas-insulated switchgear

Abstract

The utility model discloses an all-insulation shielding bus connection system for a gas-insulated switchgear, and relates to the field of electrical connection of gas-insulated switchgears and buses. The utility model is mainly designed for solving the problems of poor adaptability and the like of a specific bus gas-insulated switchgear socket for connecting a bus and a gas-insulated switchgear in the prior art. The device comprises an outgoing line sleeve, a shielding cylinder and an insulating tube bus. A capacitive insulator is coated outside a circular conductor of the wire outlet sleeve, a mounting flange is arranged outside the capacitive insulator, two ends of the circular conductor are provided with a wiring terminal and a plugging terminal, and a contact finger is arranged in a contact finger groove of the plugging terminal; a capacitive insulator covers a cylinder body of the shielding cylinder, supporting flanges are arranged at two ends of the capacitive insulator, and a conductive socket is arranged in the cylinder body; a capacitive insulator is coated outside a circular conductor of the insulating tube bus, a connecting flange is arranged outside the capacitive insulator, and a plug terminal is arranged at the end part of the circular conductor. The shielding cylinder is sleeved on the wire outlet sleeve and the insulating tube bus and is connected with the wire outlet sleeve and the insulating tube bus through flanges; and the conductive socket is plugged with the wire outlet sleeve and the plugging terminal of the insulating tube bus conductor. The method has the advantage of being good in adaptability.

Description

Technical field:

[0001] The utility model relates to the field of electrical connection between an inflatable cabinet and a busbar, in particular to a fully insulated shielded connection system between an outlet line of an inflatable cabinet and a busbar. Background technology:

[0002] Inflatable cabinets are widely used. The existing busbar and inflatable cabinet connection uses a single manufacturer's specific busbar inflatable cabinet socket, which has poor adaptability, high cost, low reliability, and difficult to ensure safety. Summary of the invention:

[0003] The technical problem to be solved by the utility model is to provide a fully insulated shielded busbar connection system for an inflatable cabinet which has strong adaptability, high safety and reliability, low cost and can be fully insulated and shielded connected to the inflatable cabinet.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a fully insulated shielded busbar connection system for an inflatable cabinet, which comprises: an outlet bushing, a shielding tube, and an insulating tube busbar.

[0005] The outlet bushing comprises a first circular conductor, the first circular conductor is covered with a first capacitor-type insulator, a mounting flange is arranged outside the first capacitor-type insulator, a wiring terminal is arranged at one end of the first circular conductor, a first plug-in terminal is arranged at the other end, a contact finger groove is arranged on the first plug-in terminal, and a contact finger is installed in the contact finger groove; the shielding cylinder is cylindrical, the cylinder is covered with a second capacitor-type insulator, support flanges are arranged at both ends of the outside of the second capacitor-type insulator, and a conductive socket is arranged in the inner cavity of the cylinder; the insulating tube busbar comprises a second circular conductor, the second circular conductor is covered with a third capacitor-type insulator, a connecting flange is arranged at one end outside the third capacitor-type insulator, at least one end of the second circular conductor is provided with a plug-in terminal, a contact finger groove is arranged on the plug-in terminal, and a contact finger is installed in the contact finger groove.

[0006] The inner end of the outlet bushing is arranged in the gas-filled cabinet and sealed and plugged with the gas-filled cabinet. One end of the shielding tube is sleeved on the outer end of the outlet bushing and connected through a flange. The other end of the shielding tube is sleeved on the insulating tube busbar and connected through a flange. The conductive socket in the shielding tube is plugged with the plug-in terminal of the outlet bushing and the plug-in terminal at the conductor end of the insulating tube busbar. The current is conducted through the contact fingers of the plug-in terminal. The outlet bushing, the insulating tube busbar and the shielding tube are connected to a fully insulated shielding connection through opposite capacitor screens.

[0007] As an improvement to the fully insulated shielded busbar connection system for an inflatable cabinet, a capacitor screen is arranged inside the first capacitor-type insulator of the outlet bushing, which is shortened from the inside to the outside and from the two ends to the middle. The innermost capacitor screen is connected to the first circular conductor at the same potential as a high potential, and the outermost capacitor screen is connected to the mounting flange at the same potential as the ground potential.

[0008] As an improvement to the fully insulated shielded busbar connection system for an inflatable cabinet, a sealing groove is provided on the upper surface of the outlet bushing mounting flange, a sealing ring is provided in the sealing groove, which is used for sealing connection with the shielding tube support flange, and the lower surface of the outlet bushing mounting flange is sealed with the mounting part on the cabinet body, that is, the mounting part on the cabinet body is provided with a sealing groove, and a sealing ring is provided in the sealing groove.

[0009] As an improvement to the fully insulated shielded busbar connection system for the gas charging cabinet, after the outlet bushing is sealed and plugged into the gas charging cabinet for installation, the mounting flange of the outlet bushing must be reliably connected to the ground potential of the gas charging cabinet body.

[0010] As an improvement on the fully insulated shielded busbar connection system for an inflatable cabinet, a capacitor screen which is lengthened from the inside to the outside and from the middle to both ends is arranged inside the second capacitor-type insulator of the shielding tube, and the innermost capacitor screen is connected to the conductive socket at the same potential. After the shielding tube is fitted with the outlet bushing and the insulating tube busbar, the conductive socket is connected to the plug-in terminals at the conductor ends of the outlet bushing and the insulating tube busbar at a high potential, and the outermost capacitor screen is connected to the supporting flange, and the supporting flange is at ground potential.

[0011] As an improvement to the fully insulated shielded busbar connection system for an inflatable cabinet, the shielding tube can be a vertically installed straight tube structure or a vertically installed curved tube structure capable of changing direction by ≥90°.

[0012] As an improvement of the fully insulated shielded busbar connection system for the inflatable cabinet, the capacitance screen of the insulating tube busbar capacitance insulator is shortened from the inside to the outside and from the two ends to the middle.

[0013] As an improvement to the fully insulated shielded busbar connection system for the gas cabinet, the support flanges at both ends of the shielding tube are sealed with the mounting flange of the outlet bushing and the connecting flange of the insulating tube busbar respectively. After installation, the flanges of the three must be reliably grounded.

[0014] As an improvement of the fully insulated shielded busbar connection system for the inflatable cabinet, the cylinder body of the shielding cylinder includes load-bearing cylinders located at both ends and a metal conductive tube located in the middle that are connected together. A sealing groove is provided on the supporting flange on the connection side of the second capacitive insulator and the insulating tube busbar, and a sealing ring is provided in the sealing groove. The supporting flange is used to be connected and fixed to the mounting flange on the outlet bushing and the connecting flange on the insulating tube type.

[0015] The utility model has the advantages of using outlet bushings as outlets of the gas cabinet, and outlet bushings are widely used in medium-voltage and high-voltage electrical equipment such as transformers and combined electrical appliances. A large number of practices have proved that the technology is mature, safe and reliable. It is used in medium-voltage gas cabinets, and has the advantages of low cost and strong adaptability. The shielding tube, the outlet bushing and the insulating tube busbar all use capacitive insulation, which can achieve ideal full insulation shielding. Compared with the busbar gas cabinet socket, it has a high cost-effectiveness advantage. Description of the drawings:

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the outlet bushing in the utility model;

[0018] Figure 3 It is a structural schematic diagram of the shielding tube in the utility model;

[0019] Figure 4 It is a structural schematic diagram of the insulating tube busbar in the utility model. Specific implementation method:

[0020] The following is combined with Figure 1-4 The technical solution of the present invention is further described in detail so that those skilled in the art can better understand and implement it, but the embodiments are not intended to limit the present invention.

[0021] Reference Figure 1 A fully insulated shielded busbar connection system for an inflatable cabinet comprises an outlet bushing 1, a shielding tube 2, and an insulating tube busbar 3.

[0022] Reference Figure 2 The outlet bushing 1 comprises a first circular conductor 1-1, the first circular conductor is covered with a first capacitive insulator 1-2, a mounting flange 1-3 is arranged outside the first capacitive insulator, a wiring terminal 1-6 is arranged at one end of the first circular conductor, and a first plug-in terminal 1-4 is arranged at the other end, a contact finger groove is arranged on the first plug-in terminal, and a contact finger 1-5 is installed in the contact finger groove;

[0023] Reference Figure 3 The shielding cylinder 2 is cylindrical, the cylinder 2-1 is covered with a second capacitive insulator 2-2, support flanges 2-3 are respectively arranged at both ends of the second capacitive insulator, and a conductive socket 2-4 is arranged in the inner cavity of the cylinder;

[0024] Reference Figure 4 The insulating tube busbar 3 includes a second circular conductor 3-1, the second circular conductor is covered with a third capacitive insulator 3-2, a connecting flange 3-3 is provided at one end outside the third capacitive insulator, and a plug-in terminal 3-4 is provided at at least one end of the second circular conductor, a contact finger groove is provided on the plug-in terminal, and a contact finger is installed in the contact finger groove.

[0025] The inner end of the outlet bushing is arranged in the gas-filled cabinet and sealed and plugged with the gas-filled cabinet. One end of the shielding tube is sleeved on the outer end of the outlet bushing and connected through a flange. The other end of the shielding tube is sleeved on the insulating tube busbar and connected through a flange. The conductive socket in the shielding tube is plugged with the plug-in terminal of the outlet bushing and the plug-in terminal at the conductor end of the insulating tube busbar. The current is conducted through the contact fingers of the plug-in terminal. The outlet bushing, the insulating tube busbar and the shielding tube are connected to a fully insulated shielding connection through opposite capacitor screens.

[0026] The first circular conductor of the outlet bushing is preferably a copper rod, and the capacitor screen of the first circular conductor covered with the first capacitor-type insulator is shortened from the inside to the outside and from the two ends to the middle. The capacitor-type insulator is preferably solid insulation, and a sealing groove is provided on the upper surface of the mounting flange outside the capacitor-type insulator (the side facing the shielding tube), and a sealing ring 1-7 is provided in the sealing groove. The mounting flange and the first capacitor-type insulator are reliably interfered with, and a sealing ring is preferably provided between the assembly surfaces of the two.

[0027] One end of the first circular conductor is preferably provided with a plug-in terminal for connecting to the shielding tube, the plug-in terminal is provided with a contact finger groove, and a contact finger is installed in the contact finger groove. The other end of the first circular conductor is preferably provided with a conductive terminal connected to the conductor in the inflatable cabinet, the end face of the conductive terminal is a conductive contact surface, and the conductive contact is provided with a threaded hole for connection.

[0028] The body of the shielding tube includes load-bearing tubes at both ends and a metal conductive tube in the middle, and the capacitance screen of the second capacitance-type insulator covered on the outer surface of the tube is lengthened from the middle to both ends. A sealing groove is provided on the support flange on the side where the second capacitance-type insulator is connected to the insulating tube busbar, and a sealing ring is provided in the sealing groove. The support flange is used to connect and fix with the mounting flange on the outlet bushing and the upper connection flange of the insulating tube.

[0029] The metal conductive tube located in the middle part of the shielding tube body is preferably a 90-degree elbow, and the two ends of the shielding tube and the outlet sleeve and the insulating tube busbar sleeve are preferably epoxy insulating tubes. The metal conductive tube in the middle part and the epoxy insulating tubes at both ends are preferably threaded and epoxy bonded to form an integrated whole.

[0030] The second circular conductor of the insulating tube busbar is preferably a copper tube or an aluminum tube, and the capacitance screen of the third capacitance type insulator covered by the second circular conductor is shortened from the inside to the outside and from the two ends to the middle. The connecting flange is arranged on the capacitance type insulator close to the plug-in side of the shielding tube, and the connecting flange and the capacitance type insulator are preferably integrated into one by interference fitting and epoxy curing.

[0031] After the fully insulated shielded busbar connection system is assembled for the gas-filled cabinet, the mounting flange of the outlet bushing should be connected to the ground potential of the gas-filled cabinet, and the supporting flange of the shielding tube and the connecting flange of the insulating tube busbar must also be reliably connected to the ground potential.

[0032] The above are only preferred implementations of the utility model, and do not limit the patent scope of the utility model. Any equivalent structure or equivalent process transformation made using the contents of the utility model specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the utility model.

Claims

1. A fully insulated shielded busbar connection system for an inflatable cabinet, characterized by: It comprises an outlet bushing (1), a shielding tube (2), and an insulating tube busbar (3); The outlet bushing (1) comprises a first circular conductor (1-1), the first circular conductor is covered with a first capacitive insulator (1-2), a mounting flange (1-3) is arranged outside the first capacitive insulator, one end of the first circular conductor is provided with a wiring terminal (1-6), the other end is provided with a first plug-in terminal (1-4), the first plug-in terminal is provided with a contact finger groove, and a contact finger (1-5) is installed in the contact finger groove; The shielding cylinder (2) is cylindrical, the cylinder (2-1) is covered with a second capacitive insulator (2-2), support flanges (2-3) are respectively arranged at two ends of the exterior of the second capacitive insulator, and a conductive socket (2-4) is arranged in the inner cavity of the cylinder; The insulating tube busbar (3) comprises a second circular conductor (3-1), the second circular conductor is covered with a third capacitor-type insulator (3-2), a connecting flange (3-3) is arranged at an outer end of the third capacitor-type insulator, at least one end of the second circular conductor is provided with a plug-in terminal (3-4), the plug-in terminal is provided with a contact finger groove, and a contact finger is installed in the contact finger groove; The inner end of the outlet bushing is arranged in the gas-filled cabinet and sealed and plugged with the gas-filled cabinet. One end of the shielding tube is sleeved on the outer end of the outlet bushing and connected through a flange. The other end of the shielding tube is sleeved on the insulating tube busbar and connected through a flange. The conductive socket in the shielding tube is plugged with the plug-in terminal of the outlet bushing and the plug-in terminal at the conductor end of the insulating tube busbar. The current is conducted through the contact fingers of the plug-in terminal. The outlet bushing, the insulating tube busbar and the shielding tube are connected to a fully insulated shielding connection through opposite capacitor screens.

2. The fully insulated shielded busbar connection system for an inflatable cabinet according to claim 1 is characterized in that: A capacitor screen is arranged inside the first capacitor-type insulator of the outlet bushing, which is shortened from the inside to the outside and from the two ends to the middle. The innermost capacitor screen is connected to the first circular conductor at the same potential as a high potential, and the outermost capacitor screen is connected to the mounting flange at the same potential as the ground potential.

3. The fully insulated shielded busbar connection system for an inflatable cabinet according to claim 1 is characterized in that: The upper surface of the installation flange of the outlet bushing is provided with a sealing groove, and a sealing ring (1-7) is provided in the sealing groove for sealing connection with the shielding tube support flange.

4. The fully insulated shielded busbar connection system for an inflatable cabinet according to claim 1 is characterized in that: A capacitor screen that is lengthened from the inside to the outside and from the middle to both ends is arranged inside the second capacitor-type insulator of the shielding tube. The innermost capacitor screen is connected to the conductive socket at the same potential. After the shielding tube is assembled with the outlet bushing and the insulating tube busbar, the conductive socket is connected to the plug-in terminals at the conductor ends of the outlet bushing and the insulating tube busbar at a high potential. The outermost capacitor screen is connected to the supporting flange, and the supporting flange is at ground potential.

5. The fully insulated shielded busbar connection system for an inflatable cabinet according to claim 1 is characterized in that: The shielding cylinder is in a straight cylinder shape or a curved cylinder shape.

6. The fully insulated shielded busbar connection system for an inflatable cabinet according to claim 1 is characterized in that: The capacitance screen of the third capacitance insulator of the insulating tube busbar is shortened from the inside to the outside and from the two ends to the middle.

7. The fully insulated shielded busbar connection system for an inflatable cabinet according to claim 1 is characterized in that: The body of the shielding tube includes load-bearing tubes at both ends and a metal conductive tube in the middle, and a sealing groove is provided on the supporting flange on the side where the second capacitive insulator is connected to the insulating tube busbar, and a sealing ring is provided in the sealing groove.

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