Tool for cable withstand voltage test

Abstract

The utility model aims to provide a tool for a cable withstand voltage test, relating to the technical field of test tools, the tool for the cable withstand voltage test comprises a cable head, a front sealing member and a rear sealing member, the cable head is cylindrical, one end of the cable head is open and forms a socket end, the other end of the cable head is closed and forms a fixed end, and the front sealing member and the rear sealing member are arranged on the cable head. Two mounting ports are symmetrically formed in the side wall of the fixed end, the front sealing element and the rear sealing element are detachably inserted into the two mounting ports respectively and seal the corresponding mounting ports, a connecting assembly used for fixing a cable is arranged on the front sealing element, and an exhaust valve is arranged on the rear sealing element. The tool for the cable withstand voltage test provided by the utility model can be quickly connected with a cable terminal box cable head, and the efficiency of the cable withstand voltage test is improved.

Description

Technical Field

[0001] This utility model relates to the field of testing fixture technology, and in particular to a fixture for cable withstand voltage testing. Background Technology

[0002] A prefabricated substation is a highly integrated power distribution device that combines high-voltage switchgear, transformers, low-voltage power distribution equipment, etc., in a fully enclosed metal enclosure to form a compact outdoor substation.

[0003] Gas-insulated switchgear is the core equipment on the high-voltage side of a prefabricated substation, using gas insulation technology to isolate, control, and protect high-voltage circuits. As prefabricated substations trend towards miniaturization, pluggable cables are increasingly used in these switchgear to save space, improve the flexibility of the power distribution system, and enhance maintenance efficiency. In addition to meeting standard electrical performance requirements, pluggable cables used in these switchgear must also possess sufficient voltage withstand capability.

[0004] For factories, rigorous cable withstand voltage testing is crucial to ensuring the safe operation of pluggable cables after they leave the factory. Conventional cable withstand voltage tests involve directly applying pressure to the cable termination. However, pluggable cables have shorter creepage distances at the stress cone section, making them prone to flashover when tested directly in air. Therefore, it is necessary to insert the pluggable cable into the test cable termination for testing.

[0005] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a tooling for cable withstand voltage testing through repeated experiments, in order to solve the problems existing in the prior art. Utility Model Content

[0006] The purpose of this invention is to provide a tooling for cable withstand voltage testing, which can quickly connect cable terminals and cable heads, thereby improving the efficiency of cable withstand voltage testing.

[0007] To achieve the above objectives, this utility model proposes a fixture for cable withstand voltage testing. The fixture includes a cable head, a front seal, and a rear seal. The cable head is cylindrical, with one end open to form a plug end and the other end closed to form a fixed end. Two mounting ports are symmetrically provided on the side wall of the fixed end. The front seal and the rear seal are detachably inserted into the two mounting ports and close the corresponding ports. The front seal is provided with a connecting component for fixing the cable, and the rear seal is provided with an exhaust valve.

[0008] As described above, the fixture for cable withstand voltage testing has two externally sealed connecting pipes to the mounting ports, and the front seal and the rear seal respectively penetrate the two connecting pipes and are sealed to the corresponding connecting pipes.

[0009] As described above, the tooling for cable withstand voltage testing includes a double-ended stud and a fixing nut. One end of the double-ended stud is fixedly connected to the front seal, and the rear seal has a threaded hole that mates with the double-ended stud. The other end of the double-ended stud passes through the fixing nut and is threadedly connected to the rear seal through the threaded hole.

[0010] As described above, the tooling for cable withstand voltage testing includes a double-ended stud fixedly connected to one end of the front seal, and a first limiting boss at the other end of the front seal. When the front seal is inserted into the connecting pipe, the limiting boss engages with the opening of the connecting pipe.

[0011] As described above, the tooling for cable withstand voltage testing includes an axially penetrating mounting cavity on the rear seal. One end of the mounting cavity faces the cable head to form a connecting end, and the other end of the mounting cavity faces away from the cable head to form a discharge end. The exhaust valve is located at the discharge end.

[0012] As described above, the fixture for cable withstand voltage testing includes an exhaust valve comprising a valve body and a drive mechanism. One end of the valve body is a mounting end, and the other end is an exhaust end. The mounting end passes through the mounting cavity and is sealed with the rear seal. An exhaust channel is provided inside the valve body. One end of the exhaust channel opens onto the end face of the mounting end, and the other end opens onto the side wall of the exhaust end. The drive mechanism drives the valve body to reciprocate axially along the mounting cavity. When the exhaust end protrudes from the mounting cavity, the exhaust channel is connected to the atmosphere.

[0013] The fixture for cable withstand voltage testing as described above further includes a test fixture trolley, which includes a test chamber and multiple wheels mounted on the bottom of the test chamber. The test chamber is hollow and forms a test cavity. The plug end of the cable head is sealed through the top of the test chamber and extends into the test cavity.

[0014] As described above, the fixture for cable withstand voltage testing includes a fixed base on the top of the test chamber, and the fixed end of the cable head is fixedly connected to the fixed base.

[0015] As described above, the fixture for cable withstand voltage testing includes a guide rail on the top of the test chamber that aligns with the front seal. The guide rail is parallel to the axis of the mounting port at the fixed end. The front seal is mounted on a fixed block, and a slider is provided at the bottom of the fixed block. The slider slides in cooperation with the guide rail.

[0016] The fixture for cable withstand voltage testing described above is further provided with a fixing cover outside the fixing end, and the fixing cover is detachably connected to the fixing base.

[0017] Compared with the prior art, the present invention has the following features and advantages:

[0018] The tooling for cable withstand voltage testing proposed in this utility model can quickly connect the cable head to the cable terminal to be tested, so as to fix and protect the cable terminal and effectively improve the efficiency of cable withstand voltage testing.

[0019] The tooling for cable withstand voltage testing proposed in this utility model enables the insertion and protection of cable terminals through the insertion end. Furthermore, after the cable terminal is inserted into the cable head, the connecting component on the front seal can fix the cable terminal, preventing the cable terminal from detaching from the cable head during the test and effectively ensuring the smooth progress of the test. At the same time, the venting device on the rear seal can promptly expel the air inside the cable head, preventing the cable terminal from being difficult to install due to the internal air pressure being greater than the external air pressure when it is inserted. Attached Figure Description

[0020] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0021] Figure 1 This is a schematic diagram of the tooling for cable withstand voltage testing proposed in this utility model;

[0022] Figure 2 This is a schematic diagram showing the connection between the cable head and the cable terminal in this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the rear seal in this utility model.

[0024] Explanation of reference numerals in the attached figures

[0025] 100. Fixtures used for cable withstand voltage testing; 10. Cable terminations;

[0026] 11. Socket end; 12. Connecting pipe;

[0027] 20. Front seal; 21. First limiting boss;

[0028] 30. Rear seal; 31. Mounting cavity;

[0029] 311. Main pipe section; 312. First expansion section;

[0030] 313. Second diameter expansion section; 314. Limiting section;

[0031] 40. Connecting component; 41. Double-ended stud;

[0032] 42. Fixing nut; 50. Air vent valve;

[0033] 51. Valve body; 511. Front push rod;

[0034] 512. Rear push rod; 513. Locking component;

[0035] 514. Button; 515. Spring;

[0036] 60. Test fixture trolley; 61. Test chamber;

[0037] 62. Wheels; 63. Fixed base;

[0038] 64. Guide rail; 65. Slider;

[0039] 66. Fixing cover; 200. Cable termination;

[0040] 210. Terminal; 220. Stress cone. Detailed Implementation

[0041] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0042] Unless otherwise defined, the directions such as up, down, left, and right mentioned in this document refer to those shown in this utility model. Figure 1 The directions of up, down, left, and right are used as a reference, and will be explained here.

[0043] like Figure 1As shown, this utility model proposes a fixture 100 for cable withstand voltage testing. The fixture 100 includes a cable head 10, a front seal 20, and a rear seal 30. The cable head 10 is cylindrical, with one end open to form a plug end 11 and the other end closed to form a fixed end. Two mounting ports are symmetrically opened on the side wall of the fixed end. The front seal 20 and the rear seal 30 are detachably inserted into the two mounting ports and close the corresponding mounting ports. A connecting component 40 for fixing the cable is provided on the front seal 20, and an exhaust valve 50 is provided on the rear seal 30.

[0044] The tooling 100 for cable withstand voltage testing proposed in this utility model can quickly connect the cable head 10 to the cable terminal 200 to be tested, so as to fix and protect the cable terminal 200 and effectively improve the efficiency of cable withstand voltage testing.

[0045] The tooling 100 for cable withstand voltage testing proposed in this utility model realizes the insertion and protection of cable terminal 200 through the plug end 11. After the cable terminal 200 is inserted into the cable head 10, the connecting component 40 on the front seal 20 can fix the cable terminal 200, preventing the cable terminal 200 from detaching from the cable head 10 during the test, effectively ensuring the smooth progress of the test. At the same time, the exhaust valve 50 provided on the rear seal 30 can timely discharge the air inside the cable head 10, avoiding the cable terminal 200 being difficult to install due to the internal air pressure being greater than the external air pressure when it is inserted.

[0046] In an optional embodiment of this utility model, two mounting ports are externally sealed with connecting pipes 12, and a front seal 20 and a rear seal 30 respectively penetrate the two connecting pipes 12 and are sealed to the corresponding connecting pipes 12. With the above structure, the connecting pipes 12 limit the front seal 20 and the rear seal 30, ensuring that the front seal 20 and the rear seal 30 effectively seal the cable head 10.

[0047] In an optional example of this embodiment, the connecting assembly 40 includes a double-ended stud 41 and a fixing nut 42. One end of the double-ended stud 41 is fixedly connected to the front seal 20, and the rear seal 30 has a threaded hole that mates with the double-ended stud 41. The other end of the double-ended stud 41 passes through the fixing nut 42 and is threadedly connected to the rear seal 30 through the threaded hole.

[0048] During installation, insert the cable terminal 200 into the cable head 10, then install the front seal 20, ensuring that the double-ended stud 41 on the front seal 20 passes through the terminal hole on the cable terminal 200. Secure the cable terminal 200 with the retaining nut 42, then install the rear seal 30. Tighten the rear seal 30 onto the double-ended stud 41 through the threaded hole, ensuring that the front seal 20 and rear seal 30 respectively seal their corresponding mounting ports. During the installation of the rear seal 30, the vent valve 50 can remain open to allow air to escape from the cable head 10, preventing excessive pressure within the cable head 10. After the rear seal 30 is installed, close the vent valve 50.

[0049] It should be noted that after the cable terminal 200 and the cable head 10 are installed, the terminal 210 and stress cone 220 of the cable terminal 200 are both inserted into the cable head 10.

[0050] In an optional example, the double-ended stud 41 is fixedly connected to one end of the front seal 20, and the other end of the front seal 20 is provided with a first limiting boss 21. After the front seal 20 passes through the connecting pipe 12, the first limiting boss 21 is engaged with the opening of the connecting pipe 12. With the above structure, the first limiting boss 21 not only limits the front seal 20, but also further ensures the sealing fit between the front seal 20 and the connecting pipe 12.

[0051] Furthermore, the rear seal 30 also has a second limiting boss, the structure and function of which are similar to the first limiting boss, and will not be described in detail here.

[0052] In one optional embodiment of this utility model, both the front seal 20 and the rear seal 30 are in the shape of a conical sleeve.

[0053] In an optional embodiment of this utility model, the rear seal 30 has an axially penetrating mounting cavity 31. One end of the mounting cavity 31 faces the cable head 10 to form a connecting end, and the other end of the mounting cavity 31 faces away from the cable head to form a discharge end. The exhaust valve 50 is disposed at the discharge end.

[0054] In one optional embodiment of this implementation, the threaded hole is opened at the connection end of the mounting cavity 31, which avoids multiple openings of the rear seal 30, ensuring the structural strength of the rear seal 30 and reducing the processing difficulty.

[0055] In an optional example of this embodiment, the exhaust valve 50 includes a valve body 51 and a drive mechanism. One end of the valve body 51 is a mounting end, and the other end is an exhaust end. The mounting end passes through the mounting cavity 31 and is sealed to the rear seal 30. An exhaust passage 52 is provided inside the valve body 51. One end of the exhaust passage 52 opens onto the end face of the mounting end, and the other end opens onto the side wall of the exhaust end. The drive mechanism is used to push the valve body 51 to reciprocate axially along the mounting cavity 31. When the exhaust end protrudes from the mounting cavity 31, the exhaust passage 52 is connected to the atmosphere. With the above structure, when the exhaust valve 50 needs to be opened, the valve body 51 moves outward toward the mounting cavity 31 so that the exhaust end protrudes from the mounting cavity 31. When the exhaust valve 50 needs to be closed, the valve body 51 moves inward toward the mounting cavity 31 to close the exhaust passage 52.

[0056] In an optional example, the valve body 51 includes a front push rod 511, a rear push rod 512, a locking element 513, and a button 514 arranged sequentially from the mounting end to the exhaust end. The mounting cavity 31 includes a main pipe section 311, a first expansion section 312, a second expansion section 313, and a limiting section 314 arranged sequentially from the connecting end to the exhaust end. The inner diameter of the first expansion section 312 is larger than the inner diameter of the main pipe section 311, forming a first limiting step. The inner diameter of the second expansion section 313 is larger than the inner diameter of the first expansion section 312, forming a second limiting step. The inner diameter of the limiting section 314 is smaller than the inner diameter of the second expansion section 313. The front push rod 511 has a first guide section and a second guide section. The outer diameter of the second guide section is larger than the outer diameter of the first guide section, forming a third limiting step. The first guide section of the front push rod 511 is sealed through the main pipe section 311, and the second guide section of the front push rod 511 is sealed through the first expansion section. 312, Spring 515 is sleeved outside the first guide section, with one end of Spring 515 abutting against the first limiting step and the other end of Spring 515 abutting against the third limiting step. The second guide section is fixedly connected to the rear push rod 512. The rear push rod 512 and the locking member 513 are both sealed through the second expansion section 313. Button 514 passes through the limiting section 314. One end of Button 514 is aligned with the locking member 513, and the other end of Button 514 protrudes from the mounting cavity 31. The other end of the exhaust channel 52 opens on the side wall of Button 514. The rear push rod 512 has a first serrated portion at one end facing the locking member 513, the locking member 513 has a second serrated portion, and the button 413 has a third serrated portion at the end facing the locking member 513. The first serrated portion is aligned with the second and third serrated portions respectively. The second serrated portion has deep teeth and shallow teeth spaced apart. When the second serrated part engages with the shallow tooth, the opening of the exhaust passage 52 on the button 514 is closed by the rear seal 30, and the exhaust valve 50 is closed; when the second serrated part engages with the deep tooth, the button 514 moves outward, and the opening of the exhaust passage 52 connects with the atmosphere, thus realizing the exhaust function.

[0057] In an optional embodiment of the present invention, the tooling 100 for the cable withstand voltage test further includes a test tooling trolley 60, which includes a test chamber 61 and a plurality of wheels 62 installed at the bottom of the test chamber 61. The test chamber 61 is hollow inside and forms a test cavity. The plug end of the cable head 10 is sealed through the top of the test chamber 61 and extends into the test cavity.

[0058] In an optional example of this embodiment, the top of the test chamber 61 is provided with a fixed base 63, and the fixed end of the cable head 10 is fixedly connected to the fixed base 63.

[0059] In an optional example of this embodiment, the top of the test chamber 61 is provided with a guide rail 64 that aligns with the front seal 20. The guide rail 64 is arranged parallel to the axis of the mounting port of the fixed end (i.e., the axis of the connecting pipe 12). The front seal 20 is mounted on the fixed block 67. The bottom of the fixed block 67 is provided with a slider 65, which slides with the guide rail 64.

[0060] In an optional embodiment, the fixed end is further covered by a fixing cover 66, which is detachably connected to the fixing base 63.

[0061] Please refer to Figures 1 to 3 The following is a detailed description of the specific implementation process of the tooling for cable withstand voltage testing proposed in this utility model, with reference to an embodiment:

[0062] like Figure 1 As shown, the cable head 10 is fixed to the test fixture trolley 60 via the fixed base 63 and the fixed cover 66. During the test, the prepared cable terminal 200 is quickly pushed into the cable head 10 through the plug end 11, so that the round hole on the terminal 210 of the cable terminal 200 is aligned with the center of the fixed end of the cable head 10. The slider 65 is manually pushed along the guide rail 64 towards the cable head 10, pushing the front seal fixed on the slider 65 to the front sealing position. The double-ended stud 41 on the front seal 20 passes through the round hole of the terminal 210 of the cable terminal 200, and the connection between the double-ended stud 41 and the terminal 210 is fixed with the fixing nut 42. Then, the other end of the double-ended stud 41 is fixed with the rear seal 30 until it is tightened.

[0063] The rear seal 30 has a hollow structure with an axially penetrating mounting cavity 31. The front end of the mounting cavity 31 is a threaded hole that mates with the double-ended stud 41. When installing the rear seal 30, first press the button 514. The third serrated structure at the other end of the button 514 pushes the first serrated structure of the rear push rod 512 along the engagement port of the locking member 513, while the front push rod 511 moves along the compression direction of the spring 515. When the first serrated structure of the rear push rod 512 reaches the engagement port of the locking member 513, the second serrated structure of varying depths on the locking member 513 rotates along the engagement direction of the locking member 513 into a deeper serration. The spring 515 rebounds, pushing the front push rod 511 and the rear push rod 512 to the deepest part of the locking member 513. At this point, the button 514 is in the open state, and the exhaust channel 52 is exposed, ready for installation. After the rear seal 30 is installed, press the button 514 to make the rear push rod 512 engage with the locking member 513 in a shallow engagement. At this time, the exhaust channel 52 of the button 514 is inside the button, and the inside of the cable head 10 is in a closed state.

[0064] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A fixture for cable withstand voltage testing, characterized in that, The fixture for the cable withstand voltage test includes a cable head, a front seal, and a rear seal. The cable head is cylindrical, with one end open to form a plug end and the other end closed to form a fixed end. Two mounting ports are symmetrically opened on the side wall of the fixed end. The front seal and the rear seal are detachably inserted into the two mounting ports and close the corresponding mounting ports. The front seal is provided with a connecting component for fixing the cable, and the rear seal is provided with an exhaust valve.

2. The tooling for cable withstand voltage testing as described in claim 1, characterized in that, The two mounting ports are externally sealed with connecting pipes, and the front seal and the rear seal respectively penetrate the two connecting pipes and are sealed to the corresponding connecting pipes.

3. The tooling for cable withstand voltage testing as described in claim 2, characterized in that, The connecting assembly includes a double-ended stud and a fixing nut. One end of the double-ended stud is fixedly connected to the front seal. The rear seal has a threaded hole that mates with the double-ended stud. The other end of the double-ended stud passes through the fixing nut and is threadedly connected to the rear seal through the threaded hole.

4. The tooling for cable withstand voltage testing as described in claim 3, characterized in that, The double-ended stud is fixedly connected to one end of the front seal, and the other end of the front seal is provided with a first limiting boss. When the front seal is inserted into the connecting pipe, the limiting boss is engaged with the opening of the connecting pipe.

5. The tooling for cable withstand voltage testing as described in claim 1, characterized in that, The rear seal has an axially penetrating mounting cavity. One end of the mounting cavity faces the cable head to form a connecting end, and the other end of the mounting cavity faces away from the cable head to form a discharge end. The exhaust valve is located at the discharge end.

6. The tooling for cable withstand voltage testing as described in claim 5, characterized in that, The exhaust valve includes a valve body and a drive mechanism. One end of the valve body is a mounting end, and the other end is an exhaust end. The mounting end passes through the mounting cavity and is sealed with the rear seal. An exhaust passage is provided in the valve body. One end of the exhaust passage opens on the end face of the mounting end, and the other end opens on the side wall of the exhaust end. The drive mechanism drives the valve body to reciprocate along the axial direction of the mounting cavity. When the exhaust end protrudes from the mounting cavity, the exhaust passage is connected to the atmosphere.

7. The tooling for cable withstand voltage testing as described in claim 1, characterized in that, The fixture for the cable withstand voltage test also includes a test fixture trolley, which includes a test box and multiple wheels installed at the bottom of the test box. The test box is hollow and forms a test cavity. The plug end of the cable head is sealed through the top of the test box and extends into the test cavity.

8. The fixture for cable withstand voltage testing as described in claim 7, characterized in that, The test chamber is equipped with a fixed base on top, and the fixed end of the cable head is fixedly connected to the fixed base.

9. The fixture for cable withstand voltage testing as described in claim 8, characterized in that, The top of the test chamber is provided with a guide rail that aligns with the front seal. The guide rail is arranged parallel to the axis of the mounting port at the fixed end. The front seal is mounted on a fixed block. The bottom of the fixed block is provided with a slider that slides with the guide rail.

10. The fixture for cable withstand voltage testing as described in claim 8, characterized in that, The fixed end is further covered by a fixing cover, which is detachably connected to the fixed base.

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