Wire nose interface device for withstand voltage test

Abstract

The invention provides a cable lug interface device for a withstand voltage test. The cable lug interface device comprises an interface device body, an insulating layer wrapping the outer layer of the interface device body, and a contact crimping block and a spring which are arranged in the interface device body, one end of the spring is fixedly connected to one side of the interface device body, the other end of the spring is connected with the bottom end of the contact crimping block, and an insertion gap exists between the top end of the contact crimping block and the side wall of the other side of the interface device body; the plugging gap is used for plugging a cable lug; an anti-deviation device is also arranged in the interface device body; and the deviation prevention device is used for limiting the contact crimping block from deviating after being pressed. The wire nose interface device for the withstand voltage test has better safety and reliability, and meets the technical requirements of the withstand voltage test.

Description

Technical Field

[0001] The invention relates to the field of cable testing, and in particular to a wire nose interface device for a withstand voltage test. Background Art

[0002] Research has found that for transformers and high-voltage switchgear with a voltage level of 35kV and below, due to the small space for internal cable installation, the cables are in a scattered state before being connected and fixed to the busbar, which causes the cables to be close to other equipment and metal casings in the cabinet.

[0003] When the cable is subjected to a 52kV (maximum test voltage) AC withstand test, the cable nose is easily susceptible to discharge, insulation breakdown, and flashover with other equipment in the cabinet and the metal casing after being pressurized.

[0004] Among them, insulation breakdown: discharge and flashover phenomena may cause insulation materials of cables and other equipment to break down, causing equipment damage. Flashover refers to the instantaneous discharge phenomenon caused by current passing through gas or insulating materials under high voltage conditions. It usually occurs on the surface of an insulator or in a gas, and manifests as a high-energy arc discharge. The same discharge phenomenon may cause the equipment casing to be charged, increasing the risk of electric shock to operators.

[0005] The above-mentioned insulation breakdown, flashover and discharge phenomena will cause damage to the cable body, test equipment and other equipment in the cabinet, and even cause harm to the test personnel; therefore, when conducting high-voltage withstand voltage tests, appropriate safety precautions must be taken to avoid the occurrence of discharge, breakdown and flashover phenomena to ensure the safety and reliability of the equipment. Summary of the invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a wire nose interface device for a withstand voltage test, which can wrap or cover the cable wire nose to insulate the cable wire nose, thereby isolating the cable wire nose from other equipment and metal casing in the cabinet, and ultimately ensure that no discharge, breakdown or flashover events will occur due to the cable wire nose during the pressurization process of the cable withstand voltage test.

[0007] The present invention provides a wire nose interface device for a withstand voltage test, comprising an interface device body, an insulating layer wrapped around the outer layer of the interface device body, and a contact crimping block and a spring arranged inside the interface device body;

[0008] One end of the spring is fixedly connected to one side of the interface device body, and the other end of the spring is connected to the bottom end of the contact crimping block. There is a plug-in gap between the top of the contact crimping block and the side wall of the other side of the interface device body; the plug-in gap is used to plug the cable lug; the contact crimping block is used to move telescopically from one side to the other side inside the interface device body under the telescopic action of the spring;

[0009] The bottom of the contact crimping block is provided with an edge portion extending in the upper and lower directions of the interface device body; an anti-deflection device is also provided inside the interface device body; the anti-deflection device is arranged at the inner top surface of the interface device body, and the anti-deflection device is located on the outside of the edge portion extending upward from the bottom of the contact crimping block, and the anti-deflection device is used to limit the deflection of the contact crimping block after being compressed.

[0010] Preferably, as an implementable embodiment, chamfered surfaces are provided on both sides of the top of the contact crimping block; the chamfered surfaces are used to facilitate the insertion of the cable nose from the bottom of the interface device body from the outside.

[0011] Preferably, as an implementable embodiment, the angle between the plane at the top of the contact crimping block and the chamfered cut surface is 45 degrees.

[0012] Preferably, as an implementable embodiment, the anti-deflection device is a blocking block in the shape of a rectangular parallelepiped.

[0013] Preferably, as an implementable embodiment, the contact crimping block is a copper block.

[0014] Preferably, as an implementable embodiment, the spring is a copper pressure spring.

[0015] Preferably, as an implementable embodiment, the insulating layer is a silicone insulating layer or a polyethylene insulating layer.

[0016] Preferably, as an implementation method, nano silicon filler is also arranged inside the insulating layer. It should be noted that the nano silicon filler can improve the mechanical properties and thermal stability of the insulating layer and increase the dielectric strength of the insulating material.

[0017] Preferably, as an implementable embodiment, the surface of the insulating layer is also coated with a high temperature resistant protective layer.

[0018] Preferably, as an implementable embodiment, the high temperature resistant protective layer is a fluorocarbon coating.

[0019] Compared with the prior art, the technical solution provided by the present invention has at least the following advantages:

[0020] The first embodiment of the present invention provides a cable nose interface device for a withstand voltage test, which adopts a design of contact crimping block and spring cooperation, and can make the contact crimping block and the cable nose in close contact under the action of the spring to ensure a good electrical connection. The plug-in gap is set to facilitate the insertion of the cable nose, and the top chamfer cut surface design further improves the convenience of plugging.

[0021] The first embodiment of the present invention provides a wire nose interface device for a withstand voltage test, which has better safety and reliability, wherein the outer insulating layer (silicone or polyethylene) can effectively isolate electrical components to prevent accidental contact. The anti-deflection device (blocking block) can limit the deflection of the contact crimping block to ensure stable contact.

[0022] Embodiment 1 of the present invention provides a wire nose interface device for a withstand voltage test, which has excellent withstand voltage performance, wherein a contact crimping block made of copper has good electrical conductivity and mechanical strength.

[0023] Embodiment 1 of the present invention provides a wire nose interface device for a pressure test. The device, through specific structural design and material selection, achieves excellent pressure resistance performance, good adaptability and long-term stable use while ensuring safety and reliability, and meets the technical requirements of the pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of the wire nose interface device for pressure resistance test of the present invention.

[0026] Icons: interface device body 10; insulating layer 20; contact crimping block 30; spring 40; edge portion 50; anti-deflection device 60; chamfered surface 70. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0030] Embodiment 1:

[0031] The first embodiment of the present invention provides a wire nose interface device for a withstand voltage test, comprising an interface device body 10, an insulating layer 20 wrapped around the outer layer of the interface device body, and a contact crimping block 30 and a spring 40 arranged inside the interface device body;

[0032] One end of the spring 40 is fixedly connected to one side of the interface device body, and the other end of the spring 40 is connected to the bottom end of the contact crimping block. There is a plug-in gap between the top of the contact crimping block 30 and the side wall of the other side of the interface device body (the spring acts on the contact crimping block to provide elastic force for the contact crimping block so that the contact crimping block is in close contact with the cable lug); the plug-in gap 50 is used for plugging the cable lug; the contact crimping block 30 is used to move telescopically from one side to the other side inside the interface device body under the telescopic action of the spring (that is, the above-mentioned contact crimping block (copper block material): can be telescopic under the action of the spring);

[0033] The bottom of the contact crimping block 30 is provided with an edge portion 50 extending in the upper and lower directions of the interface device body; an anti-deflection device 60 is also provided inside the interface device body; the anti-deflection device 60 is arranged at the inner top surface of the interface device body, and the anti-deflection device 60 is located on the outside of the edge portion extending upward from the bottom of the contact crimping block, and the anti-deflection device 60 is used to limit the deflection of the contact crimping block after being compressed (that is, when the cable nose is inserted into the interface device, a force is generated on one side of the contact crimping block, causing the contact crimping block to deflect. In order to prevent this situation, a blocking block is designed on the other side of the contact crimping block to prevent the contact crimping block from deflecting due to the force).

[0034] Embodiment 1 of the present invention provides a cable nose interface device for a withstand voltage test, which adopts a design of a contact crimping block and a spring, and can make the contact crimping block in close contact with the cable nose under the action of the spring to ensure a good electrical connection. The plug-in gap is set to facilitate the insertion of the cable nose, and the top chamfer cut surface design further improves the convenience of plugging. Embodiment 1 of the present invention provides a cable nose interface device for a withstand voltage test, which can be used for the withstand voltage test of cables with a voltage level of 35kV and below.

[0035] Embodiment 1 of the present invention provides a wire nose interface device for a withstand voltage test, which has better safety and reliability, wherein the outer insulating layer (silicone or polyethylene) can effectively isolate electrical components to prevent accidental contact. The anti-deflection device (blocking block) can limit the deflection of the contact crimping block to ensure stable contact. Nano-silicon fillers are added to the insulating layer to improve the dielectric strength and thermal stability. The surface is coated with a high-temperature resistant protective layer (such as a fluorocarbon coating) to improve the heat resistance and chemical resistance of the device.

[0036] In summary, the first embodiment of the present invention provides a wire nose interface device for a withstand voltage test, which has excellent withstand voltage performance, wherein the contact crimping block made of copper has good conductivity and mechanical strength.

[0037] The specific structural structure of the line nose interface device for the pressure test provided by the embodiment of the present invention is described in detail below;

[0038] like Figure 1 As shown, chamfered surfaces 70 are provided on both sides of the top of the contact crimping block; the chamfered surfaces 70 are used to facilitate the insertion of the cable lug from the bottom of the interface device body from the outside.

[0039] Preferably, as an implementable embodiment, the angle between the plane at the top of the contact crimping block and the chamfered cut surface is 45 degrees.

[0040] It should be noted that the two ends of the top surface of the above-mentioned contact crimping block are chamfered to obtain chamfered surfaces, and the angle between the plane at the top of the contact crimping block and the chamfered surface is 45 degrees, which is convenient for the cable nose to be inserted from the outside of the interface device. After the cable nose is inserted, it will be pressed by the contact crimping block, which plays the role of tight contact and fixed wire nose.

[0041] Preferably, as an implementable embodiment, the anti-deflection device is a blocking block in the shape of a rectangular parallelepiped.

[0042] like Figure 1 As shown, the contact crimping block is a copper block (ie, the contact crimping block can be made of various materials, but copper block material is preferably used). The spring is a copper pressure spring.

[0043] Preferably, as an implementable embodiment, the insulating layer is a silicone insulating layer or a polyethylene insulating layer.

[0044] It should be noted that the insulating layer is preferably a silicone insulating layer or a polyethylene insulating layer: the outermost layer of the interface device is silicone or polyethylene material, and the cable nose plays the role of insulation from other equipment and metal casing in the cabinet after pressurization.

[0045] Preferably, as an implementable embodiment; one side of the interface device body of the above-mentioned voltage withstand test line nose interface device is also extended outwardly with an outlet plug 80 (ie, an external high-voltage test line);

[0046] Embodiment 1 of the present invention provides a line nose interface device for a withstand voltage test, which is suitable for cables with a voltage level of 35kV and below, that is, the connection point between the high-voltage test line and the interface device is designed to be a welding method or a plug method (that is, a plug-in method implemented by the above-mentioned outlet plug 80). Among them, the advantage of selecting the welding method is that it is firm and reliable, and will not loosen during the test. The advantage of selecting the plug method is that it is convenient for the maintenance and replacement of the interface device. If the interface device fails, a new interface device can be replaced at any time.

[0047] Embodiment 1 of the present invention provides a wire nose interface device for a withstand voltage test, which has a safety function and a convenient plug-in structure design function; wherein the safety function includes preventing the cable nose from causing damage to the cable body, the test device, and other equipment in the cabinet due to discharge, breakdown, and flashover during the cable test. Avoid incidents of injury to test personnel. The convenient plug-in structure design function includes: a simple design that allows the cable nose to be easily inserted into the interface device, plug-and-play, and easy to use.

[0048] Therefore, the wire nose interface device for a withstand voltage test provided in Embodiment 1 of the present invention has better safety and reliability, ensuring stable access and contact of the wire nose (this design helps to prevent poor contact or connection failure that may occur during high-voltage testing). At the same time, it can withstand a predetermined voltage under specified withstand voltage test conditions without breakdown or damage, thereby ensuring the reliable operation safety of the withstand voltage test.

[0049] Embodiment 2:

[0050] See also Figure 1 , Embodiment 2 of the present invention provides a wire nose interface device for a withstand voltage test, which has the same structural design as that in Embodiment 1, except that it is optimized at the insulating layer, as detailed in Embodiment 2;

[0051] Embodiment 2 of the present invention provides a wire nose interface device for a withstand voltage test, comprising an interface device body, an insulating layer wrapped around the outer layer of the interface device body, and a contact crimping block and a spring arranged inside the interface device body; it should also be explained that the above-mentioned spring preferably uses a pressure spring, and the elastic coefficient of the spring can be designed and selected as needed; the larger the elastic coefficient, the "harder" the spring, that is, the greater the force required for deformation per unit length. Of course, factors that affect the spring elastic coefficient include the wire diameter, outer diameter, number of turns, elastic modulus of the material, etc. of the spring, which will not be repeated here.

[0052] One end of the spring is fixedly connected to one side of the interface device body, and the other end of the spring is connected to the bottom end of the contact crimping block. There is a plug-in gap between the top of the contact crimping block and the side wall of the other side of the interface device body (the spring acts on the contact crimping block to provide elastic force for the contact crimping block, so that the contact crimping block is in close contact with the cable lug); the plug-in gap is used for plugging the cable lug; the contact crimping block is used to move telescopically from one side to the other side inside the interface device body under the telescopic action of the spring (that is, the above-mentioned contact crimping block: can be telescopic under the action of the spring);

[0053] The contact crimping block is preferably made of copper block material because of its better stability. Copper is an excellent conductive material, and its conductivity is second only to silver. Using copper block as the contact crimping block can ensure the high efficiency and stability of the electrical connection.

[0054] The contact crimping block has excellent mechanical properties: the copper block material has high strength and good ductility, can maintain stable mechanical properties in electrical connections, and reduce connection failures caused by mechanical stress.

[0055] The contact crimping block is corrosion-resistant: copper and its alloys exhibit good corrosion resistance in the atmosphere and various environments, which helps to extend the service life of electrical equipment.

[0056] The bottom of the contact crimping block is provided with an edge portion extending in the upper and lower directions of the interface device body; an anti-deflection device is also provided inside the interface device body; the anti-deflection device is arranged at the inner top surface of the interface device body, and the anti-deflection device is located on the outside of the edge portion extending upward from the bottom of the contact crimping block, and the anti-deflection device is used to limit the deflection of the contact crimping block after being compressed (that is, when the cable nose is inserted into the interface device, a force is generated on one side of the contact crimping block, causing the contact crimping block to deflect. In order to prevent this situation, a blocking block is designed on the other side of the contact crimping block to prevent the contact crimping block from deflecting due to the force).

[0057] In addition, the technical solution adopted in the second embodiment of the present invention further adopts a specific material structure design relative to the first embodiment, as detailed in the solution below;

[0058] Preferably, as an implementation method, nano silicon filler is also arranged inside the insulating layer. It should be noted that the nano silicon filler can improve the mechanical properties and thermal stability of the insulating layer and increase the dielectric strength of the insulating material.

[0059] Preferably, as an implementable embodiment, the surface of the insulating layer is also coated with a high temperature resistant protective layer.

[0060] Preferably, as an implementable embodiment, the high temperature resistant protective layer is a fluorocarbon coating.

[0061] It should be noted that through the above-mentioned surface treatment method, that is, coating a protective layer: a layer of wear-resistant and corrosion-resistant material is coated on the surface of the insulating layer, and a high-temperature resistant coating, such as a fluorocarbon coating, is used to improve the heat resistance and chemical resistance of the insulating layer and improve its adaptability to the electric field.

[0062] The first embodiment of the present invention provides a line nose interface device for a withstand voltage test, which also adopts the following outlet design: the connection point between the high-voltage test line and the interface device is designed to be welded or plugged. The advantage of the welding method is that it is firm and reliable, and will not get loose during the test. The advantage of the plug method is that it is convenient for the maintenance and replacement of the interface device. If the interface device fails, a new interface device can be replaced at any time.

[0063] Embodiment 2 of the present invention provides a wire nose interface device for a pressure test. The device, through specific structural design and material selection, ensures safety and reliability while achieving excellent pressure resistance, good adaptability and long-term stable use, thus meeting the technical requirements of the pressure test.

[0064] In summary, the wire nose interface device for a withstand voltage test provided by the embodiment of the present invention has better safety and reliability, ensuring stable access and contact of the wire nose (this design helps to prevent problems such as poor contact or connection failure that may occur during high-voltage testing). At the same time, the device achieves excellent withstand voltage performance and reliability (it can withstand a predetermined voltage without breakdown or damage under specified withstand voltage test conditions) while ensuring safety and reliability through specific structural design and material selection, thus ensuring reliable operation safety of the withstand voltage test. Through these features, the wire nose interface device for a withstand voltage test can provide users with a safe, reliable and efficient withstand voltage test solution.

[0065] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0066] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0067] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. A person skilled in the art may modify the technical solutions described in the above embodiments, or replace part or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A line nose interface device for a withstand voltage test, characterized in that: It comprises an interface device body, an insulating layer wrapped around the outer layer of the interface device body, and a contact crimping block and a spring arranged inside the interface device body; One end of the spring is fixedly connected to one side of the interface device body, and the other end of the spring is connected to the bottom end of the contact crimping block. There is a plug-in gap between the top of the contact crimping block and the side wall of the other side of the interface device body; the plug-in gap is used to plug the cable lug; the contact crimping block is used to move telescopically from one side to the other side inside the interface device body under the telescopic action of the spring; The bottom of the contact crimping block is provided with an edge portion extending in the upper and lower directions of the interface device body; an anti-deflection device is also provided inside the interface device body; the anti-deflection device is arranged at the inner top surface of the interface device body, and the anti-deflection device is located on the outside of the edge portion extending upward from the bottom of the contact crimping block, and the anti-deflection device is used to limit the deflection of the contact crimping block after being compressed.

2. A line nose interface device for a withstand voltage test as claimed in claim 1, characterized in that: Both sides of the top of the contact crimping block are provided with chamfered surfaces; the chamfered surfaces are used to facilitate the insertion of the cable lug from the bottom of the interface device body from the outside.

3. A line nose interface device for a withstand voltage test as claimed in claim 2, characterized in that: The angle between the plane at the top of the contact crimping block and the chamfered cut surface is 45 degrees.

4. A line nose interface device for a withstand voltage test as claimed in claim 3, characterized in that: The anti-deflection device is a blocking block in the shape of a rectangular parallelepiped.

5. A line nose interface device for a withstand voltage test as claimed in claim 1, characterized in that: The contact crimping block is a copper block.

6. A line nose interface device for a withstand voltage test as claimed in claim 1, characterized in that: The spring is a copper pressure spring.

7. A line nose interface device for a withstand voltage test as claimed in claim 1, characterized in that: The insulating layer is a silicone insulating layer or a polyethylene insulating layer.

8. A line nose interface device for a withstand voltage test as claimed in claim 1, characterized in that: Nano silicon filler is also arranged inside the insulating layer.

9. A line nose interface device for a withstand voltage test as claimed in claim 1, characterized in that: The surface of the insulating layer is also coated with a high temperature resistant protective layer.

10. A line nose interface device for a withstand voltage test as claimed in claim 9, characterized in that: The high temperature resistant protective layer is a fluorocarbon coating.

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