A side-spliced ​​busbar connector test terminal

Abstract

The invention discloses a side-spliced ​​busbar connector test terminal, which belongs to the technical field of inflatable switch cabinets. The test terminal is used for adaptive connection with a side-expansion busbar bushing installed on the inflatable switch cabinet, wherein a central conductor is cast in the side-expansion busbar bushing. The test terminal comprises: an adapter matched with the side-expansion busbar bushing; an insulating boot sleeve sleeved on the adapter, and the insulating boot sleeve is conducted and grounded through the adapter; a connecting conductor installed inside the adapter, wherein one end of the connecting conductor is set to be fault-tolerantly connected with the central conductor, and the other end passes through the adapter and the insulating boot sleeve in sequence, and extends to the outside of the insulating boot sleeve, so as to apply voltage to the inflatable switch cabinet through the side-expansion busbar bushing, and at the same time solve the problem of the bushing discharging to the box body when pressurized.

Description

Technical Field

[0001] The present invention belongs to the technical field of inflatable switch cabinets, in particular to the detection field of medium and low voltage inflatable cabinets connected by side-joined busbars, and specifically relates to a side-joined busbar connector test terminal. Background Art

[0002] As all walks of life have higher and higher requirements for power reliability, the number of inflatable switchgear, especially ring main unit, is increasing. Ring main unit is a group of electrical equipment that installs transmission and distribution electrical equipment in metal or non-metal cabinets or makes assembled interval ring main unit. Its core part uses load switches and fuses. It has the advantages of simple structure, small size, low price, and can improve power supply parameters and performance as well as power supply safety. It is widely used in distribution stations and box-type substations in urban residential areas, high-rise buildings, large public buildings, factories and enterprises and other load centers.

[0003] The busbar connector is used to connect the main busbars between the inflatable cabinets or between different compartments. The busbar connector must not only meet the insulation between the main busbar and the cabinet, but also play the role of transmitting voltage and current.

[0004] When the inflatable switchgear leaves the factory, it is necessary to test the partial discharge and power frequency withstand voltage of the cabinet itself. However, the main components of the inflatable switchgear are sealed inside the box, and there is no suitable place to connect the high voltage, resulting in the inability to smoothly carry out relevant tests on the partial discharge and power frequency withstand voltage of the cabinet itself, and thus the factory quality of the inflatable switchgear cannot be guaranteed. Summary of the invention

[0005] In view of this, in order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a side-spliced ​​busbar connector test terminal to apply voltage to the inflatable switchgear through the side expansion busbar bushing, while solving the problem of bushing discharge to the box body during pressurization.

[0006] The technical solution adopted by the present invention is: a side-spliced ​​busbar connector test terminal, which is used to adapt and connect with a side-expanded busbar bushing installed on an inflatable switch cabinet, wherein a central conductor is cast in the side-expanded busbar bushing, and the test terminal comprises:

[0007] Adapter installed with side expansion busbar bushing;

[0008] An insulating boot sleeve is mounted on the adapter, and the insulating boot sleeve is connected and grounded through the adapter;

[0009] A connecting conductor is installed inside the adapter, one end of which is arranged to be fault-tolerantly connected to the center conductor, and the other end of which passes through the adapter and the insulating boot cover in sequence and extends to the outside of the insulating boot cover.

[0010] Furthermore, the adapter comprises:

[0011] A conical portion, wherein the conical portion is sleeved in the inner cavity of the side expansion busbar sleeve;

[0012] A cylindrical portion integrally formed with the conical portion, the outer portion of the cylindrical portion being connected to an insulating boot set:

[0013] One end of the adapter is mounted on the side expansion busbar bushing, and the other end is connected to the insulating boot sleeve.

[0014] Furthermore, a positioning cavity is provided at one end of the conical portion, and the positioning cavity is matched with the positioning end face of the side expansion busbar bushing, and a central conductor is cast on the positioning end face, thereby ensuring that the entire test terminal can be accurately installed on the side expansion busbar bushing.

[0015] Furthermore, a high-voltage shielding layer made of a semi-conductive material is attached to the inner surface of the positioning cavity to ensure that no local discharge is generated inside the positioning cavity.

[0016] Furthermore, a step is formed at the intersection of the conical portion and the cylindrical portion, and a grounding shield is embedded on the side of the step in the direction toward the side expansion busbar bushing. The function of the grounding shield is to shield the influence of the sharp angle of the opening on the local discharge when the side expansion busbar bushing is installed on the side of the inflatable switchgear, to shield the influence of the sharp angle of the installation flange on the local discharge, and also to shield the influence of other external factors on the local discharge of the product.

[0017] Furthermore, a boss is provided on the side wall of the cylindrical portion, a through hole is provided on the boss and a grounding wire is connected through the boss for grounding, and a grounding shielding layer made of semi-conductive material is attached to the surface of the step, grounding shield, boss and cylindrical portion to ensure that external interference signals do not affect the test.

[0018] Furthermore, the insulating boot cover is set as a hollow structure, the outside of the hollow structure is provided with a plurality of disc-shaped protrusions, the inside of the hollow structure is provided with a grounding electrode and the grounding electrode is conductively connected to the grounding shielding layer, the purpose of which is grounding shielding and shielding electric field concentration.

[0019] Furthermore, the connecting conductor is configured as a tubular structure, a step ring groove is provided on the outside of one end of the tubular structure, and a plurality of notches are provided at the end of the tubular structure provided with the step ring groove. The function of the notches is that when the spherical structure of the center conductor is inserted into the interior of the connecting conductor, the inner diameter of the connecting conductor can expand, thereby facilitating easier installation of the center conductor into the interior of the connecting conductor.

[0020] Furthermore, the end of the center conductor is set as a spherical structure, and the spherical structure is fault-tolerantly sleeved with the inner hole of the step ring groove, and a spring is provided between the outside of the step ring groove and the adapter. The functions of the spring are: first, sufficient elastic force is provided by the spring to provide a continuous and stable contact force between the connecting conductor and the center conductor; second, under the action of this contact force, a constant contact force can be provided between the conical portion and the inner hole of the side expansion busbar sleeve, so that the side-spliced ​​busbar connector test terminal will not sag due to the gravity of the test terminal itself when in use.

[0021] Furthermore, one end of the central conductor is a connecting portion and the connecting portion is cast as one piece with the side expansion busbar sleeve, and the other end is a spherical structure and a fault-tolerant groove is provided between the spherical structure and the connecting portion, thereby improving the fault tolerance between the central conductor and the connecting conductor.

[0022] The beneficial effects of the present invention are:

[0023] 1. The side-spliced ​​busbar connector test terminal provided by the present invention is used in combination with an adapter, a connecting conductor, and an insulating boot cover. When a voltage is applied to the inflatable switch cabinet through the side expansion busbar, the loaded voltage can be prevented from discharging to the cabinet, so that the terminal test of the inflatable switch cabinet becomes possible, thereby realizing the detection of partial discharge and power frequency withstand voltage of the cabinet itself. At the same time, when designing the test terminal, the adapter, the connecting conductor, and the insulating boot cover are connected to each other, so that the connection can be simple, reliable and convenient when performing the terminal test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the side-expanded busbar sleeve when the side-spliced ​​busbar connector test terminal provided by the present invention is used;

[0025] Figure 2 It is a schematic diagram of the overall structure of the side-joined busbar connector test terminal provided by the present invention;

[0026] Figure 3 It is a structural schematic diagram of an adapter in a side-spliced ​​busbar connector test terminal provided by the present invention;

[0027] Figure 4 It is a structural schematic diagram of the connection conductor in the side-spliced ​​busbar connector test terminal provided by the present invention;

[0028] Figure 5 yes Figure 4 A side view schematic diagram of

[0029] Figure 6 It is a structural schematic diagram of the insulating boot cover in the side-joined busbar connector test terminal provided by the present invention;

[0030] The following are marked in the attached figure:

[0031] 1-adapter, 2-connecting conductor, 3-insulating boot, 4-grounding wire, 5-side expansion busbar sleeve, 11-conical part, 12-cylindrical part, 13-positioning cavity, 14-step, 15-grounding shield, 16-boss, 17-grounding shielding layer, 21-step ring groove, 22-spring, 23-slot, 31-protrusion, 32-grounding electrode. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Example 1

[0039] When the inflatable switch cabinet leaves the factory, it is necessary to test the electrical properties of the inflatable switch cabinet, such as partial discharge, power frequency withstand voltage and lightning impulse. In this embodiment, a side busbar connector test terminal is provided, which is used to adapt and connect with the side expansion busbar bushing 5 installed on the inflatable switch cabinet. Figure 1 As shown, to complete the relevant terminal test of the inflatable switchgear.

[0040] Design of the test terminal of the busbar connector on the opposite side, such as Figure 2 As shown, it mainly includes four parts: an adapter 1, a connecting conductor 2, an insulating boot cover 3 and a grounding wire 4. Through the coordinated use of the adapter 1, the connecting conductor 2 and the insulating boot cover 3, the corresponding functions of the side-joined busbar connector test terminal are realized.

[0041] ① Adapter

[0042] like Figure 3 As shown, the adapter 1 is matched with the side expansion busbar sleeve 5 , and the adapter 1 comprises two parts: a conical part 11 and a cylindrical part 12 integrally formed with the conical part 11 .

[0043] Regarding the design of the conical portion 11 , the conical portion 11 has a conical shape, and the conical shape matches the inner cavity of the side expansion busbar sleeve 5 to ensure that the conical portion 11 can be sleeved into the inner cavity of the side expansion busbar sleeve 5 .

[0044] In order to further ensure the positioning and assembly between the adapter 1 and the side expansion busbar bushing 5, a positioning cavity 13 is provided at one end of the conical portion 11, and a convex positioning end face is provided in the internal cavity of the side expansion busbar bushing 5, and the positioning cavity 13 is adapted to the positioning end face of the side expansion busbar bushing 5, so as to ensure the accuracy and reliability of the installation of the adapter 1. In actual application, a high-voltage shielding layer of a semi-conductive material is attached to the inner surface of the positioning cavity 13 to ensure that the connecting conductor 2 is at a high potential when in use. After the high-voltage shielding layer contacts the connecting conductor 2, a high potential is formed on the high-voltage shielding layer of the semi-conductive material, thereby ensuring that no local discharge is generated inside the positioning cavity 13.

[0045] When testing the electrical performance of the inflatable switchgear, it is necessary to connect the inflatable switchgear to high voltage electricity, and the connection of high voltage electricity is achieved through the central conductor arranged in the side expansion busbar bushing 5 on the inflatable switchgear. Therefore, a central conductor is cast on the positioning end face of the side expansion busbar bushing 5, and a fault-tolerant connection is made between the central conductor and the connecting conductor 2.

[0046] Regarding the design of the cylindrical portion 12 : the outer shape of the cylindrical portion 12 is set to a cylindrical structure, and the outer portion of the cylindrical portion 12 is sleeved and connected with the insulating boot cover 3 to achieve installation and fixation of the insulating boot cover 3 .

[0047] A boss 16 is provided on the side wall of the cylindrical portion 12, and a through hole is provided in the middle of the boss 16 and connected to the ground wire 4 through the boss 16 for grounding, that is, the ground wire 4 is fixed through the through hole and the ground shielding layer 17 is connected to the ground. A ground shielding layer 17 made of semi-conductive material is attached to the surface of the step 14, the grounding shielding 15, the boss 16 and the cylindrical portion 12. Since the above-mentioned areas are all provided with the grounding shielding layer 17, they are connected to each other and then connected to the ground wire 4, thereby ensuring that external interference signals do not affect the test.

[0048] A step 14 is formed at the intersection of the conical portion 11 and the cylindrical portion 12, and a grounding shield 15 is embedded in the side of the step 14 in the direction toward the side expansion busbar bushing 5. The grounding shield 15 is embedded in the adapter 1 to shield the influence of the sharp angle of the opening on the partial discharge when the side expansion busbar bushing 5 is installed on the side of the inflatable switch cabinet, the influence of the sharp angle of the installation flange on the partial discharge, and also the influence of other external factors on the partial discharge of the product.

[0049] ②Connecting conductor

[0050] like Figure 4 , Figure 5As shown, the connecting conductor 2 is installed inside the adapter 1, and the connecting conductor 2 is sleeved on the central conductor of the side expansion busbar bushing 5 to test the electrical performance of the inflatable switch cabinet. In order to ensure that the test terminal has good fault tolerance when connected to the side expansion busbar, the following design is adopted:

[0051] One end of the connecting conductor 2 is set to be fault-tolerantly connected with the center conductor, and the other end passes through the adapter 1 and the insulating boot cover 3 in sequence, and extends to the outside of the insulating boot cover 3. In practical application, the connecting conductor 2 is set to a tubular structure, and a step ring groove 21 is provided on the outside of one end of the tubular structure, and the tubular structure is also provided with a plurality of notches 23 at the end of the tubular structure provided with the step ring groove 21. Each notch 23 can be arranged along the circumferential direction of the end of the tubular structure. Since the inner diameter of the connecting conductor 2 is smaller than the outer diameter of the spherical structure of the center conductor, a plurality of notches 23 are provided at the end of the connecting conductor 2. For the length of the notch 23, in this embodiment, it is best that the length of the notch 23 does not exceed the length of the step ring groove 21. When the spherical structure of the center conductor is inserted into the interior of the connecting conductor 2, the inner diameter of the connecting conductor 2 can expand, which makes it easier for the center conductor to be installed inside the connecting conductor 2.

[0052] The end of the center conductor is set as a spherical structure, and the spherical structure is mis-fitted with the inner hole of the step ring groove 21, and a spring 22 is provided between the outside of the step ring groove 21 and the adapter 1, one end of the spring 22 is against the side wall of the inner hole of the cylindrical part 12 of the adapter 1, and the other end of the spring 22 is against the step ring groove 21 of the connecting conductor 2. The design of the spring 22 has the following functions: first, the spring 22 provides sufficient elastic force to provide a continuous and stable contact force between the connecting conductor 2 and the center conductor; second, under the action of this contact force, the conical part 11 and the inner hole of the side expansion busbar sleeve 5 can have a constant contact force, so that the side-spliced ​​busbar connector test terminal will not sag due to the gravity of the test terminal itself when in use.

[0053] The central conductor of the spherical structure adopted above is only a preferred solution in this embodiment, but it does not limit the test terminal to only be able to cooperate with the side expansion busbar sleeve 5 with a spherical structure when used. In actual application, the central conductor can also be set as a pillar-shaped structure, which can also be adapted to the inner hole of the connecting conductor 2 and can also meet the corresponding functional requirements.

[0054] In order to further improve the fault tolerance between the center conductor and the connecting conductor 2 when the center conductor is inserted into the connecting conductor 2, one end of the center conductor is set as a connecting part and the connecting part is cast as one piece with the side expansion busbar sleeve 5, and the other end is a spherical structure and a fault tolerance groove is provided between the spherical structure and the connecting part. On the basis of designing the fault tolerance groove, in actual application, since the center conductor is cast as one piece with the side expansion busbar sleeve 5 and fixed to the side wall of the gas cabinet through the side expansion busbar sleeve 5, and at the same time, the connecting conductor 2 and the center conductor are in contact through the spherical surface, the existence of the fault tolerance groove can make the connecting conductor 2 rotate to other directions at an angle while in contact with the center conductor, thereby effectively eliminating the installation deviation of the gas cabinet and providing reliable protection for the test terminal test.

[0055] ③Insulating boots

[0056] like Figure 6 As shown, the insulating boot cover 3 is sleeved on the adapter 1, specifically, on the cylindrical portion 12 of the adapter 1, and the insulating boot cover 3 is connected and grounded through the adapter 1. The connection here refers to the grounding connection of the insulating boot cover 3.

[0057] In practical application, the insulating boot cover 3 is set as a hollow structure, and the hollow part matches the cylindrical part 12 of the adapter 1. In practical application, the hollow part and the cylindrical part 12 of the adapter 1 are interference-fitted, and the interference-fitted cylindrical part 12 forms a certain clamping force, under the action of the clamping force, the product can be used without creepage breakdown, and the product can be difficult to move and relatively fixed in position.

[0058] The exterior of the hollow structure is provided with a plurality of disc-shaped protrusions 31 , and the provision of the plurality of protrusions 31 serves to increase the creepage distance.

[0059] A grounding electrode 32 is provided inside the hollow structure and is conductively connected to the grounding shielding layer 17 , wherein the grounding electrode 32 is symmetrically arranged inside the hollow structure and is made of semiconductor material, and its purpose is to ground the shield 15 and shield the electric field concentration.

[0060] With the test terminal provided above, when the inflatable switch cabinet needs to undergo an electrical performance test on the box body before leaving the factory, when the voltage is loaded from the side expansion busbar bushing side of the inflatable switch cabinet, the loaded voltage can be prevented from discharging to the box body, thereby ensuring the smooth progress of the electrical energy test.

[0061] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A side-spliced ​​busbar connector test terminal, which is used to adapt and connect with a side-expanded busbar bushing installed on an inflatable switch cabinet, wherein a central conductor is cast in the side-expanded busbar bushing, and is characterized in that: The test terminal includes: Adapter installed with side expansion busbar bushing; An insulating boot sleeve is mounted on the adapter, and the insulating boot sleeve is connected and grounded through the adapter; A connecting conductor installed in the adapter, one end of which is arranged to be connected to the central conductor in a fault-tolerant manner, and the other end of which passes through the adapter and the insulating boot cover in sequence and extends to the outside of the insulating boot cover; The adapter comprises: a conical portion, which is sleeved in the inner cavity of the side expansion busbar sleeve; a cylindrical portion integrally formed with the conical portion, the outer portion of which is sleeved with the insulating boot sleeve; A positioning cavity is provided at one end of the conical portion, and the positioning cavity is adapted to the positioning end face of the side expansion busbar bushing, and a central conductor is cast on the positioning end face; A step is formed at the intersection of the conical portion and the cylindrical portion, and a grounding shield is embedded in the side portion of the step in the direction toward the side expansion busbar bushing.

2. The side-spliced ​​busbar connector test terminal according to claim 1, characterized in that: A high-voltage shielding layer made of semi-conductive material is attached to the inner surface of the positioning cavity.

3. The side-joined busbar connector test terminal according to claim 1, characterized in that: A boss is provided on the side wall of the cylindrical portion, a through hole is provided on the boss and a grounding wire is connected through the boss for grounding. A grounding shielding layer made of semi-conductive material is attached to the surface of the step, the grounding shield, the boss and the cylindrical portion.

4. The side-joined busbar connector test terminal according to claim 3, characterized in that: The insulating boot cover is set as a hollow structure, the outside of the hollow structure is provided with a plurality of disc-shaped protrusions, the inside of the hollow structure is provided with a grounding electrode, and the grounding electrode is conductively connected with the grounding shielding layer.

5. The side-joined busbar connector test terminal according to claim 1, characterized in that: The connecting conductor is configured as a tubular structure, one end of which is provided with a step ring groove on the outside, and the end of the tubular structure provided with the step ring groove is also provided with a plurality of notches.

6. The side-joined busbar connector test terminal according to claim 5, characterized in that: The end of the central conductor is set as a spherical structure, and the spherical structure is sleeved with the inner hole of the step ring groove in a fault-tolerant manner, and a spring is arranged between the outside of the step ring groove and the adapter.

7. The side-joined busbar connector test terminal according to claim 6, characterized in that: One end of the central conductor is a connecting part, and the connecting part is cast as one body with the side expansion busbar sleeve, and the other end is a spherical structure, and a fault-tolerant groove is arranged between the spherical structure and the connecting part.

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