Insulation Testing Device, Outdoor High-Voltage Cable Terminal Equipment and Insulation Testing Method

Abstract

The present invention discloses an insulation testing device, an outdoor terminal device for high-voltage cables, and an insulation testing method. The insulation testing device is used to test the outdoor terminal, and the outdoor terminal has a cavity. The insulation testing device includes a sealing cover, a stress cone, and a cover plate. The sealing cover is arranged at the opening at one end of the outdoor terminal. The stress cone is connected to the sealing cover and is located in the cavity. The sealing cover and the stress cone are of an integral structure. The cover plate is arranged at the opening at the end of the outdoor terminal away from the sealing cover. The present invention aims to provide an outdoor insulation testing device for high-voltage cables with simple installation. The insulation testing device can be quickly disassembled and installed, effectively avoid damaging the cable, and completely prevent waste of the insulation filler of the outdoor terminal of the high-voltage cable.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage cable outdoor terminal equipment, and particularly relates to an insulation testing device and a high-voltage cable outdoor terminal equipment applying the insulation testing device. Background Art

[0002] The existing detection methods for the external insulation of ultra-high voltage cable outdoor terminals mainly include lightning impulse voltage tests, switching impulse voltage tests, as well as rain tests, salt spray tests, pollution tests, etc. It is required that the external insulation of the outdoor terminal does not flash over in these tests. However, due to the complex installation process, great installation difficulty of the ultra-high voltage cable outdoor terminal, and the problem that it cannot be easily moved once installed, etc., it often requires multiple installations when testing the external insulation of the high-voltage cable outdoor terminal. During the process of re-dismantling and reinstalling, damage to the cable and installation accessories is caused, and waste of the insulation filler is also caused, consuming manpower and material resources.

[0003] The above is only used to assist in understanding the technical solution of the present application, and does not represent an admission of the prior art. Summary of the Invention

[0004] The main object of the present invention is to provide a testing solution for the external insulation of a high-voltage cable outdoor terminal, aiming to provide an insulation testing device with simple installation. The insulation testing device can achieve quick disassembly and installation, and effectively avoid damage to the cable at the same time.

[0005] To achieve the above object, the insulation testing device proposed by the present invention is used to test an outdoor terminal. The outdoor terminal has a cavity. The insulation testing device includes a sealing cover, a stress cone and a cover plate. The sealing cover is arranged at the opening at one end of the outdoor terminal. The stress cone is connected to the sealing cover and is located in the cavity. The sealing cover and the stress cone are an integral structure. The cover plate is arranged at the opening at the end of the outdoor terminal far from the sealing cover.

[0006] In one embodiment, the cover plate is provided with an inflation hole, and the inflation hole communicates with the cavity. The inflation hole is used to fill nitrogen, inert gas, sulfur hexafluoride or compressed air.

[0007] In one embodiment, a lead post is further arranged on the side of the cover plate facing away from the outdoor terminal. The lead post is arranged around the inflation hole.

[0008] In one embodiment, the stress cone includes a telescopic tube and a stress cone bowl. The two ends of the telescopic tube are respectively connected to the stress cone bowl and the sealing cover. The telescopic tube can drive the stress cone bowl to move away from or close to the sealing cover.

[0009] In one embodiment, the telescopic tube includes:

[0010] The first section is connected to the sealing cover. The first section has a telescopic cavity, and the inner wall of the telescopic cavity is provided with internal threads; and

[0011] The second section, the outer wall of the second section is provided with external threads. One end of the second section extends into the telescopic cavity and is screwed to the first section through the cooperation of the external threads and the internal threads. The other end of the second section is connected to the stress cone bowl.

[0012] In one embodiment, the sealing cover and the first section are of an integrally formed structure;

[0013] And / or, the second section and the stress cone bowl are of an integrally formed structure;

[0014] And / or, the stress cone bowl is arranged in a conical shape, and the aperture of the stress cone bowl gradually increases from one end adjacent to the second section to the end far from the second section.

[0015] The present invention also provides a high-voltage cable outdoor terminal device, including:

[0016] An outdoor terminal, having a cavity; and

[0017] The above-mentioned insulation testing device, the sealing cover of the insulation testing device is covered on the opening at one end of the outdoor terminal, and the stress cone of the insulation testing device is located in the cavity, and the cover plate of the insulation testing device is covered on the opening at the other end of the outdoor terminal.

[0018] In one embodiment, the outdoor terminal includes:

[0019] An insulating bushing, having the cavity;

[0020] A plurality of umbrella skirts, and the plurality of umbrella skirts are arranged at intervals on the outer wall of the insulating bushing;

[0021] A first flange, arranged at one end of the insulating bushing, and the sealing cover is detachably connected to the first flange; and

[0022] A second flange, arranged at the end of the insulating bushing far from the first flange, and the cover plate is detachably connected to the second flange.

[0023] In one embodiment, the first flange is provided with a plurality of connection holes arranged at intervals, the sealing cover is provided with a plurality of through holes arranged at intervals, and the sealing cover is detachably connected to the first flange through a fastener passing through one of the through holes and one of the connection holes;

[0024] And / or, the second flange is provided with a plurality of installation holes arranged at intervals, the cover plate is provided with a plurality of through holes arranged at intervals, and the cover plate is detachably connected to the second flange through a fastener passing through one of the through holes and one of the installation holes;

[0025] And / or, the outdoor terminal further includes a first reinforcing rib, and the first reinforcing rib connects the insulating sleeve and the first flange;

[0026] And / or, the outdoor terminal further includes a second reinforcing rib, and the second reinforcing rib connects the insulating sleeve and the second flange.

[0027] The present invention also provides an insulation testing method for an outdoor terminal, which is used to test the insulation performance of the outdoor terminal. The insulation testing method for the outdoor terminal includes the following steps:

[0028] Provide an insulation testing device as described above;

[0029] Adjust the height between the stress cone and the sealing cover of the insulation testing device so that the stress cone has the same height as the stress cone of the outdoor terminal to be detected;

[0030] Seal the sealing cover at the opening at one end of the outdoor terminal as a grounding electrode, so that the stress cone is located in the cavity of the outdoor terminal;

[0031] Seal the cover plate of the insulation testing device at the opening at the other end of the outdoor terminal as a high-voltage end, and perform insulation testing.

[0032] In the insulation testing device of the technical solution of the present invention, the sealing cover and the stress cone are set as an integrated structure, and the sealing cover and the cover plate are respectively arranged at the openings at both ends of the outdoor terminal to seal the cavity of the outdoor terminal, so as to facilitate the quick disassembly and installation of the outdoor terminal with the sealing cover and the stress cone; at the same time, the stress cone is located in the cavity of the outdoor terminal, which can meet the detection requirements of outdoor terminals with different voltage levels or different types. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0034] Figure 1 It is a schematic structural diagram of the connection between the sealing cover and the stress cone of the insulation testing device in an embodiment of the present invention;

[0035] Figure 2 It is a schematic cross-sectional view of the connection between the sealing cover and the stress cone of the insulation testing device in an embodiment of the present invention;

[0036] Figure 3Schematic cross - sectional view of the connection between the sealing cover and the stress cone in another embodiment of the present invention;

[0037] Figure 4 Schematic structural view of the cover plate of the insulation testing device in an embodiment of the present invention;

[0038] Figure 5 Schematic cross - sectional view of the cover plate of the insulation testing device in an embodiment of the present invention;

[0039] Figure 6 Schematic structural view of an embodiment of the insulation testing device of the present invention;

[0040] Figure 7 Schematic structural view of the outdoor terminal in an embodiment of the present invention.

[0041] Explanation of the reference numerals in the drawings:

[0042]

[0043] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0045] It should be noted that all the directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0046] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where A and B are satisfied simultaneously.

[0047] In addition, in the present invention, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The present invention provides an insulation testing device, which is applied to the outdoor terminal equipment 100 of a high-voltage cable. The insulation testing device is used to test the external insulation performance of the outdoor terminal 1 of the high-voltage cable. The outdoor terminal 1 has a cavity 11a.

[0049] It can be understood that the outdoor terminal 1 is used for the wiring of outdoor cables. The outdoor terminal 1 integrates waterproofing, stress control, shielding, and insulation, has good electrical and mechanical properties, and can be used for a long time under various harsh environmental conditions. The outdoor terminal 1 has the advantages of light weight and convenient installation, and can be widely applied to various fields such as electric power, petrochemical, metallurgy, railway ports, and construction.

[0050] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown in

[0051] In the embodiment of the present invention, the insulation testing device includes a sealing cover 2, a stress cone 3, and a cover plate 4. Among them, the sealing cover 2 is arranged at the opening at one end of the outdoor terminal 1. The stress cone 3 is connected to the sealing cover 2 and is located in the cavity 11a. The sealing cover 2 and the stress cone 3 are of an integral structure. The cover plate 4 is arranged at the opening at the end of the outdoor terminal 1 far from the sealing cover 2.

[0052] It can be understood that by integrating the stress cone 3 and the sealing cover 2, and assembling the sealing cover 2 on the outdoor terminal 1, the stress cone 3 can be built into the cavity 11a of the outdoor terminal 1, effectively changing the electric potential distribution on the outer surface of the outdoor terminal 1 and playing the role of a rubber stress cone. At the same time, simple and quick installation and rapid disassembly and reinstallation can be achieved to suit different installation requirements.

[0053] In this embodiment, the stress cone 3 can be selected as a metal stress cone. By building the metal stress cone into the cavity 11a of the outdoor terminal 1, the electric potential distribution on the outer surface of the insulation test device is controlled in an equivalent way to that of a rubber stress cone, realizing the detection of the external insulation of the insulation test device.

[0054] It can be understood that by arranging the cover plate 4 at the other end of the outdoor terminal 1, the outdoor terminal 1 is assembled through the cooperation of the cover plate 4 and the sealing cover 2, making the cavity 11a of the outdoor terminal 1 a closed cavity 11a, thus ensuring that the stress cone 3 in the cavity 11a is not affected by external impurities or water vapor, etc. In this embodiment, covering the cover plate 4 and the sealing cover 2 at both ends of the outdoor terminal 1 can make the insulation test device and the outdoor terminal 1 form an integral whole.

[0055] To prevent the outdoor terminal 1 from creeping along the inner wall, gases such as nitrogen, inert gas, sulfur hexafluoride, and compressed air can be filled into the cavity 11a of the outdoor terminal 1 before the test. As Figure 4 、 Figure 5 and Figure 6 shown, in one embodiment, the cover plate 4 is provided with an air inlet hole 41, and the air inlet hole 41 communicates with the cavity 11a. The air inlet hole 41 is used to fill nitrogen, inert gas, sulfur hexafluoride, or compressed air.

[0056] It can be understood that the integrated structure of the sealing cover 2 and the stress cone 3 serves as the grounding electrode of the insulation test device, and the cover plate 4 serves as the high-voltage end of the insulation test device and forms an integral whole with the outdoor terminal 1. By providing the air inlet hole 41 on the cover plate 4 at the high-voltage end, nitrogen, inert gas, sulfur hexafluoride, or compressed air can be filled into the cavity 11a of the outdoor terminal 1 through the air inlet hole 41. In this way, creeping along the inner wall of the outdoor terminal 1 can be effectively prevented. At the same time, the gas in the cavity 11a of the outdoor terminal 1 can be recycled through the air inlet hole 41, completely eliminating the waste of the insulation filler and effectively reducing the cost.

[0057] In one embodiment, as Figure 4 、 Figure 5 and Figure 6As shown, on the side of the cover plate 4 facing away from the outdoor terminal 1, there is also a lead post 42, and the lead post 42 is arranged around the inflation hole 41. It can be understood that by setting the lead post 42, it is convenient to introduce an external cable into the insulation testing device through the lead post 42, thus effectively avoiding damage to the cable.

[0058] In one embodiment, as Figure 1 、 Figure 2 and Figure 3 shown, the stress cone 3 includes a telescopic tube 31 and a stress cone bowl 32. The two ends of the telescopic tube 31 are respectively connected to the stress cone bowl 32 and the sealing cover 2, and the telescopic tube 31 can drive the stress cone bowl 32 away from or close to the sealing cover 2.

[0059] It can be understood that integrating the stress cone bowl 32 with the sealing cover 2 through the telescopic tube 31 has two advantages. On the one hand, it is beneficial for the stress cone 3 and the sealing cover 2 to be simply installed on and quickly disassembled from the outdoor terminal 1. On the other hand, the position of the stress cone bowl 32 in the cavity 11a of the outdoor terminal 1 can be adjusted through the telescopic tube 31, so that the height of the stress cone bowl 32 in the cavity 11a is consistent with the detection height of the outer surface of the outdoor terminal 1. That is, before the sealing cover 2 is installed on the outdoor terminal 1, the height of the stress cone bowl 32 in the cavity 11a needs to be adjusted to be equivalent to the dimensions at both ends of the outdoor terminal 1 to be inspected, thus facilitating the external insulation detection of the insulation testing device.

[0060] In this embodiment, before the sealing cover 2 is installed, according to the dimensions at both ends of the outdoor terminal 1 to be inspected and the height of the stress cone bowl 32 in the cavity 11a, the sealing cover 2 and the cover plate 4 are respectively installed at both ends of the outdoor terminal 1 to seal the opening of the cavity 11a of the outdoor terminal 1. After the installation is completed, test gas is filled into the cavity 11a through the inflation hole 41 of the cover plate 4, and then the external insulation of the outdoor terminal 1 is detected.

[0061] It can be understood that the integrally arranged sealing cover 2 and stress cone 3 can be assembled with the outdoor terminal 1 to be measured on any occasion, making the overall installation and disassembly of the insulation testing device simple and convenient, with low cost, and the insulating filling gas can be recycled, avoiding the trouble of installation and disassembly during the external insulation detection of traditional outdoor terminals, and more eliminating the problem that the insulating filling agent cannot be reused, greatly reducing the labor and material costs.

[0062] In one embodiment, as Figure 1 、 Figure 2 and Figure 3As shown, the telescopic pipe 31 includes a first section 311 and a second section 312. Among them, the first section 311 is connected to the sealing cover 2. The first section 311 has a telescopic cavity 313, and the inner wall of the telescopic cavity 313 is provided with internal threads; the outer wall of the second section 312 is provided with external threads. One end of the second section 312 extends into the telescopic cavity 313 and is screwed to the first section 311 through the cooperation of the external threads and the internal threads. The other end of the second section 312 is connected to the stress cone bowl 32.

[0063] It can be understood that by setting the telescopic pipe 31 as two parts, namely the first section 311 and the second section 312 connected by screwing, while the second section 312 of the telescopic pipe 31 rotates relative to the first section 311 to achieve telescoping, the connection stability between the second section 312 and the first section 311 is improved, so that the stress cone bowl 32 can be stably located in the cavity 11a of the outdoor terminal 1. Of course, in other embodiments, the telescopic pipe 31 can also be a self-telescoping structure, such as a structure driven by a cylinder or a structure with a motor cooperating with a lead screw, etc. As long as it is a structure that can realize the telescoping of the telescopic pipe 31 driving the stress cone bowl 32, it is not limited here.

[0064] In one embodiment, as Figure 1 、 Figure 2 and Figure 3 shown, the sealing cover 2 and the first section 311 are of an integrally formed structure. It can be understood that setting the sealing cover 2 and the first section 311 as an integrally formed structure simplifies the processing steps of the sealing cover 2 and the stress cone 3 on the one hand; on the other hand, it improves the connection strength between the sealing cover 2 and the first section 311.

[0065] In one embodiment, as Figure 1 、 Figure 2 and Figure 3 shown, the second section 312 and the stress cone bowl 32 are of an integrally formed structure. It can be understood that setting the second section 312 and the stress cone bowl 32 as an integrally formed structure simplifies the processing steps of the sealing cover 2 and the stress cone 3 on the one hand; on the other hand, it improves the connection strength between the second section 312 of the stress cone 3 and the stress cone bowl 32.

[0066] In one embodiment, as Figure 1 、 Figure 2 and Figure 3 shown, the stress cone bowl 32 is arranged in a conical shape, and the aperture of the stress cone bowl 32 gradually increases from the end adjacent to the second section 312 to the end far from the second section 312. It can be understood that such a setting is beneficial to realizing the external insulation detection of the outdoor terminal 1.

[0067] As Figure 6 and Figure 7As shown in the figure, the present invention also provides a high-voltage cable outdoor terminal device 100. The high-voltage cable outdoor terminal device 100 includes an outdoor terminal 1 and an insulation testing device. The specific structure of the insulation testing device refers to the foregoing embodiments. Since the high-voltage cable outdoor terminal device 100 adopts all the technical solutions of the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0068] In this embodiment, the outdoor terminal 1 has a cavity 11a. The sealing cover 2 of the insulation testing device is provided at the opening at one end of the outdoor terminal 1, and the stress cone 3 of the insulation testing device is located in the cavity 11a. The cover plate 4 of the insulation testing device is provided at the opening at the other end of the outdoor terminal 1.

[0069] In this embodiment, the insulation testing device can be used to test the external insulation of outdoor terminals 1 such as sleeve-type outdoor terminals and composite outdoor terminals. It can be understood that the insulation testing device can also be applicable to outdoor terminals of 1 kV to 500 kV, especially suitable for the external insulation testing of extra-high voltage outdoor terminals. Especially for outdoor terminals 1 with higher voltage and more complex installation, the insulation testing device of this embodiment can more obviously show its advantages.

[0070] In this embodiment, the outdoor terminal 1 is used to be assembled at the head and tail of a cable line to complete the connection with other electrical equipment. The outdoor terminal 1 can evenly distribute the electric field at the cable end and effectively control the electrical stress. It can be understood that the electrical stress control refers to the control of the electric field distribution and electric field intensity. Appropriate measures are taken to make the electric field distribution and electric field intensity in the best state, make the electric field distribution as uniform as possible, and improve the reliability of cable operation.

[0071] It can be understood that the outdoor terminal 1 must have reliable waterproof facilities and should minimize the chance of air intrusion into the box along each joint. At the same time, it has sufficient insulation level, sealing performance and mechanical strength.

[0072] In one embodiment, as Figure 6 and Figure 7 shown, the outdoor terminal 1 includes an insulating sleeve 11, a plurality of umbrella skirts 12, a first flange 13 and a second flange 14. Among them, the insulating sleeve 11 has a cavity 11a; the plurality of umbrella skirts 12 are spaced apart on the outer wall of the insulating sleeve 11; the first flange 13 is provided at one end of the insulating sleeve 11, and the sealing cover 2 is detachably connected to the first flange 13; the second flange 14 is provided at the end of the insulating sleeve 11 away from the first flange 13, and the cover plate 4 is detachably connected to the second flange 14.

[0073] It can be understood that the umbrella skirt 12 is provided on the outer wall of the insulating sleeve 11, which is beneficial to waterproof the outdoor terminal 1. The cavity 11a of the insulating sleeve 11 is used to install other components such as the stress cone 3 and the cable. The settings of the first flange 13 and the second flange 14 facilitate the installation and sealing of the sealing cover 2 and the cover plate 4 with the outdoor terminal 1, improving the installation stability and the sealing performance at the same time.

[0074] In one embodiment, as Figure 6 and Figure 7 shown, the first flange 13 is provided with a plurality of connecting holes 131 arranged at intervals, and the sealing cover 2 is provided with a plurality of through holes 21 arranged at intervals. The sealing cover 2 is detachably connected to the first flange 13 by a fastener passing through a through hole 21 and a connecting hole 131. Of course, in other embodiments, the detachable connection between the first flange 13 of the outdoor terminal 1 and the sealing cover 2 can also adopt snap connection, plug-in fit, threaded connection or pin connection, etc., which are not limited herein.

[0075] In one embodiment, as Figure 6 and Figure 7 shown, the second flange 14 is provided with a plurality of mounting holes 141 arranged at intervals, and the cover plate 4 is provided with a plurality of through holes 43 arranged at intervals. The cover plate 4 is detachably connected to the second flange 14 by a fastener passing through a through hole 43 and a mounting hole 141. Of course, in other embodiments, the detachable connection between the second flange 14 of the outdoor terminal 1 and the cover plate 4 can also adopt snap connection, plug-in fit, threaded connection or pin connection, etc., which are not limited herein.

[0076] In one embodiment, as Figure 6 and Figure 7 shown, the outdoor terminal 1 further includes a first reinforcing rib 15, and the first reinforcing rib 15 connects the insulating sleeve 11 and the first flange 13. It can be understood that by providing the first reinforcing rib 15, the connection strength between the first flange 13 and the insulating sleeve 11 can be enhanced by the first reinforcing rib 15.

[0077] In one embodiment, as Figure 6 and Figure 7 shown, the outdoor terminal 1 further includes a second reinforcing rib 16, and the second reinforcing rib 16 connects the insulating sleeve 11 and the second flange 14. It can be understood that by providing the second flange 14, the connection strength between the second flange 14 and the insulating sleeve 11 can be enhanced by the second reinforcing rib 16.

[0078] The present invention also proposes an insulation test method for an outdoor terminal, which is used to test the insulation performance of the outdoor terminal 1. The insulation test method for the outdoor terminal includes the following steps:

[0079] Provide an insulation test device as described above;

[0080] Adjust the height between the stress cone 3 and the sealing cover 2 of the insulation testing device so that the stress cone 3 has the same height as the stress cone of the outdoor terminal 1 to be tested;

[0081] Seal the sealing cover 2 at the opening at one end of the outdoor terminal 1 as the grounding electrode so that the stress cone 3 is located in the cavity 11a of the outdoor terminal 1;

[0082] Seal the cover plate 4 of the insulation testing device at the opening at the other end of the outdoor terminal 1 as the high-voltage end and conduct an insulation test.

[0083] The specific structure of this insulation testing device refers to the foregoing embodiments. Since the insulation testing method of this outdoor terminal adopts all the technical solutions of all the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated here one by one.

[0084] The insulation testing device proposed by the present invention breaks through the traditional detection method for the external insulation of high-voltage outdoor terminals. By being placed inside the cavity 11a of the outdoor terminal 1 and adjusting the height of the stress cone bowl 32 of the stress cone 3, that is, the stress cone 4 has a telescopic property, the position of the stress cone bowl 32 can be adjusted to the same height as the stress cone of the outdoor terminal 1 to be tested, so as to achieve the same potential distribution effect. Furthermore, the external insulation characteristics of the insulation testing device can be tested, as well as the external insulation characteristics of outdoor terminals 1 with different voltage levels and different application scenarios. This greatly improves the detection efficiency, simplifies the installation of the insulation testing device, effectively avoids the trouble in the cable treatment process, and eliminates the waste of insulating filling oil. At the same time, in cooperation with the sealing cover plate 4 installed at the upper end of the outdoor terminal 1, by providing an inflation hole 41 and a lead post 42 on the cover plate 4, the inflation hole 41 can be used to fill nitrogen, sulfur hexafluoride, inert gas, etc. into the cavity 11a of the outdoor terminal 1 to protect the inner wall of the outdoor terminal 1 from flashover, and the lead post 42 can be used to connect high-voltage leads or install grading rings.

[0085] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An insulation testing device for testing an outdoor terminal, the outdoor terminal having a cavity, characterized in that, The insulation testing device includes a sealing cover, a stress cone and a cover plate. The sealing cover is arranged at the opening at one end of the outdoor terminal. The stress cone is connected to the sealing cover and is located in the cavity. The sealing cover and the stress cone are of an integral structure. The cover plate is arranged at the opening at the end of the outdoor terminal away from the sealing cover; The cover plate is provided with an inflation hole, and the inflation hole communicates with the cavity. The inflation hole is used for inflating nitrogen, inert gas, sulfur hexafluoride or compressed air; On the side of the cover plate facing away from the outdoor terminal, a lead post is further provided, and the lead post is arranged around the inflation hole; The stress cone includes a telescopic tube and a stress cone bowl. The two ends of the telescopic tube are respectively connected to the stress cone bowl and the sealing cover, and the telescopic tube can drive the stress cone bowl to move away from or close to the sealing cover.

2. The insulation testing device according to claim 1, characterized in that The telescopic tube includes: A first section, connected to the sealing cover. The first section has a telescopic cavity, and the inner wall of the telescopic cavity is provided with internal threads; and A second section, the outer wall of the second section is provided with external threads. One end of the second section extends into the telescopic cavity and is screwed to the first section through the cooperation of the external threads and the internal threads. The other end of the second section is connected to the stress cone bowl.

3. The insulation testing device according to claim 2, wherein The sealing cover and the first section are of an integrally formed structure; And / or, the second section and the stress cone bowl are of an integrally formed structure; And / or, the stress cone bowl is arranged in a conical shape, and the aperture of the stress cone bowl gradually increases from the end adjacent to the second section to the end away from the second section.

4. A high-voltage cable outdoor terminal device, characterized in that, Includes: An outdoor terminal, having a cavity; And The insulation testing device according to any one of claims 1 to 3, the sealing cover of the insulation testing device is covered on the opening at one end of the outdoor terminal, and the stress cone of the insulation testing device is located in the cavity, and the cover plate of the insulation testing device is covered on the opening at the other end of the outdoor terminal.

5. The high-voltage cable outdoor terminal device according to claim 4, characterized in that The outdoor terminal includes: An insulating bushing, having the cavity; A plurality of umbrella skirts, and the plurality of umbrella skirts are arranged at intervals on the outer wall of the insulating bushing; A first flange, arranged at one end of the insulating bushing, and the sealing cover is detachably connected to the first flange; and A second flange, arranged at the end of the insulating bushing away from the first flange, and the cover plate is detachably connected to the second flange.

6. The high-voltage cable outdoor terminal device according to claim 5, characterized in that, The first flange is provided with a plurality of connection holes arranged at intervals, and the sealing cover is provided with a plurality of through holes arranged at intervals. The sealing cover is detachably connected to the first flange through a fastener passing through one of the through holes and one of the connection holes; And / or, the second flange is provided with a plurality of mounting holes arranged at intervals, and the cover plate is provided with a plurality of through holes arranged at intervals. The cover plate is detachably connected to the second flange through a fastener passing through one of the through holes and one of the mounting holes; And / or, the outdoor terminal further includes a first reinforcing rib, and the first reinforcing rib connects the insulating bushing and the first flange; And / or, the outdoor terminal further includes a second reinforcing rib, and the second reinforcing rib connects the insulating bushing and the second flange.

7. An insulation test method for an outdoor terminal, which is used to test the insulation of the outdoor terminal, is characterized in that The insulation testing method for the outdoor terminal includes the following steps: Provide an insulation testing device according to any one of claims 1 to 3; Adjust the height between the stress cone of the insulation test device and the sealing cover so that the stress cone is at the same height as the stress cone of the outdoor terminal to be detected; Seal the sealing cover at the opening at one end of the outdoor terminal as the grounding electrode so that the stress cone is located in the cavity of the outdoor terminal; Seal the cover plate of the insulation test device at the opening at the other end of the outdoor terminal as the high-voltage end and conduct an insulation test.

Images